{"id":50739,"date":"2023-12-23T10:31:40","date_gmt":"2023-12-23T02:31:40","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%b8%ad%e7%9a%84sql%e6%b3%a8%e5%85%a5%e5%8f%8a%e5%a6%82%e4%bd%95%e8%bd%bb%e6%9d%be%e9%a2%84%e9%98%b2\/"},"modified":"2023-12-23T15:27:00","modified_gmt":"2023-12-23T07:27:00","slug":"java%e4%b8%ad%e7%9a%84sql%e6%b3%a8%e5%85%a5%e5%8f%8a%e5%a6%82%e4%bd%95%e8%bd%bb%e6%9d%be%e9%a2%84%e9%98%b2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%b8%ad%e7%9a%84sql%e6%b3%a8%e5%85%a5%e5%8f%8a%e5%a6%82%e4%bd%95%e8%bd%bb%e6%9d%be%e9%a2%84%e9%98%b2\/","title":{"rendered":"Java\u4e2d\u7684SQL\u6ce8\u5165\u53ca\u5982\u4f55\u8f7b\u677e\u9884\u9632"},"content":{"rendered":"<h2>\u4ec0\u4e48\u662fSQL\u6ce8\u5165\uff1f<\/h2>\n<p>SQL\u6ce8\u5165\u662f\u5341\u5927\u7f51\u7edc\u5e94\u7528\u7a0b\u5e8f\u6f0f\u6d1e\u4e4b\u4e00\u3002\u7b80\u5355\u6765\u8bf4\uff0cSQL\u6ce8\u5165\u6307\u7684\u662f\u901a\u8fc7\u7528\u6237\u8f93\u5165\u7684\u6570\u636e\u5728\u67e5\u8be2\u4e2d\u6ce8\u5165\/\u63d2\u5165SQL\u4ee3\u7801\u3002\u5b83\u53ef\u80fd\u51fa\u73b0\u5728\u4efb\u4f55\u4f7f\u7528\u5173\u7cfb\u6570\u636e\u5e93\u7684\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u5982Oracle\u3001MySQL\u3001PostgreSQL\u548cSQL Server\u3002<\/p>\n<p>\u4e3a\u4e86\u8fdb\u884cSQL\u6ce8\u5165\uff0c\u6076\u610f\u7528\u6237\u9996\u5148\u5c1d\u8bd5\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\u627e\u5230\u4e00\u4e2a\u53ef\u4ee5\u5d4c\u5165SQL\u4ee3\u7801\u548c\u6570\u636e\u7684\u5730\u65b9\u3002\u8fd9\u53ef\u4ee5\u662f\u4efb\u4f55\u7f51\u7edc\u5e94\u7528\u7a0b\u5e8f\u7684\u767b\u5f55\u9875\u9762\u6216\u5176\u4ed6\u4efb\u4f55\u5730\u65b9\u3002\u56e0\u6b64\uff0c\u5f53\u5e94\u7528\u7a0b\u5e8f\u63a5\u6536\u5230\u5d4c\u5165SQL\u4ee3\u7801\u7684\u6570\u636e\u65f6\uff0cSQL\u4ee3\u7801\u5c06\u4e0e\u5e94\u7528\u7a0b\u5e8f\u67e5\u8be2\u4e00\u8d77\u88ab\u6267\u884c\u3002<\/p>\n<h2>SQL\u6ce8\u5165\u7684\u5f71\u54cd<\/h2>\n<ul class=\"post-ul\">\n<li>A malicious user can obtain unauthorized access to your application and steal data.<\/li>\n<li>They can alter, delete data in your database and take your application down.<\/li>\n<li>A hacker can also get control of the system on which database server is running by executing database specific system commands.<\/li>\n<\/ul>\n<h2>SQL\u6ce8\u5165\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f<\/h2>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3atbluser\u7684\u6570\u636e\u5e93\u8868\uff0c\u7528\u4e8e\u5b58\u50a8\u5e94\u7528\u7a0b\u5e8f\u7528\u6237\u7684\u6570\u636e\u3002 userId \u662f\u8be5\u8868\u7684\u4e3b\u5217\u3002\u6211\u4eec\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\u6709\u4e00\u4e2a\u529f\u80fd\uff0c\u901a\u8fc7userId\u53ef\u4ee5\u83b7\u53d6\u4fe1\u606f\u3002userId\u7684\u503c\u901a\u8fc7\u7528\u6237\u8bf7\u6c42\u6765\u63a5\u6536\u3002<\/p>\n<p>\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u4e0b\u9762\u7684\u793a\u4f8b\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token class-name\">String<\/span> userId <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">{<\/span>get data from end user<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span> \r\n<span class=\"token class-name\">String<\/span> sqlQuery <span class=\"token operator\">=<\/span> <span class=\"token string\">\"select * from tbluser where userId = \"<\/span> <span class=\"token operator\">+<\/span> userId<span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<h3>1. \u6709\u6548\u7684\u7528\u6237\u8f93\u5165\u3002<\/h3>\n<p>\u5f53\u4f7f\u7528\u6709\u6548\u7684\u6570\u636e\u6267\u884c\u4e0a\u8ff0\u67e5\u8be2\uff0c\u5373userId\u503c\u4e3a132\u65f6\uff0c\u6267\u884c\u7ed3\u679c\u5c06\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<p>\u8f93\u5165\u6570\u636e\uff1a132<\/p>\n<p>\u6267\u884c\u67e5\u8be2\uff1a\u9009\u62e9*\u4ecetbluser\u8868\u4e2d\uff0c\u5176\u4e2duserId = 132\u3002<\/p>\n<p>\u7ed3\u679c\uff1a\u67e5\u8be2\u5c06\u8fd4\u56deuserId\u4e3a132\u7684\u7528\u6237\u7684\u6570\u636e\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u6ca1\u6709\u8fdb\u884cSQL\u6ce8\u5165\u3002<\/p>\n<h3>2. \u9ed1\u5ba2\u4f7f\u7528\u8005\u8f93\u5165<\/h3>\n<p>\u9ed1\u5ba2\u53ef\u4ee5\u4f7f\u7528\u50cfPostman\u3001cURL\u7b49\u5de5\u5177\u4fee\u6539\u7528\u6237\u8bf7\u6c42\uff0c\u5c06SQL\u4ee3\u7801\u4f5c\u4e3a\u6570\u636e\u53d1\u9001\uff0c\u4ece\u800c\u7ed5\u8fc7\u4efb\u4f55UI\u7aef\u9a8c\u8bc1\u3002<\/p>\n<p>\u8f93\u5165\u6570\u636e: 2\u62161=1<\/p>\n<p>\u6267\u884c\u67e5\u8be2\uff1a\u9009\u62e9*\u4ecetbluser\u4e2d\uff0c\u5176\u4e2duserId=2\u62161=1\u3002<\/p>\n<p>\u7ed3\u679c\uff1a\u73b0\u5728\u4e0a\u8ff0\u67e5\u8be2\u5177\u6709\u4f7f\u7528SQL OR\u8868\u8fbe\u5f0f\u7684\u4e24\u4e2a\u6761\u4ef6\u3002<\/p>\n<ul class=\"post-ul\">\n<li>userId=2: This part will match table rows having userId value as \u20182\u2019.<\/li>\n<li>1=1:\u00a0This part will be always evaluate as true. So Query will return all the rows of the table.<\/li>\n<\/ul>\n<h2>SQL\u6ce8\u5165\u7684\u7c7b\u578b<\/h2>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u770b\u56db\u79cd\u7c7b\u578b\u7684SQL\u6ce8\u5165\u653b\u51fb\u3002<\/p>\n<h3>1. \u57fa\u4e8e\u5e03\u5c14\u903b\u8f91\u7684SQL\u6ce8\u5165<\/h3>\n<p>\u4ee5\u4e0a\u793a\u4f8b\u662f\u5e03\u5c14\u7c7b\u578b\u7684SQL\u6ce8\u5165\u6848\u4f8b\u3002\u5b83\u4f7f\u7528\u53ef\u4ee5\u8bc4\u4f30\u4e3a\u771f\u6216\u5047\u7684\u5e03\u5c14\u8868\u8fbe\u5f0f\u3002\u5b83\u53ef\u7528\u4e8e\u4ece\u6570\u636e\u5e93\u4e2d\u83b7\u53d6\u989d\u5916\u7684\u4fe1\u606f\u3002\u4f8b\u5982\uff1b<\/p>\n<p>\u8f93\u5165\u6570\u636e\uff1a2\u62161=1<\/p>\n<p>SQL\u67e5\u8be2\uff1a\u4ecetbl_employee\u8868\u4e2d\u9009\u62e9first_name\u548clast_name\u5b57\u6bb5\uff0c\u5176\u4e2dempId\u7b49\u4e8e2\u62161\u7b49\u4e8e1\u3002<\/p>\n<h3>2. \u57fa\u4e8e\u8054\u5408\u7684SQL\u6ce8\u5165<\/h3>\n<p>SQL\u7684\u8054\u5408\u64cd\u4f5c\u7b26\u5c06\u5177\u6709\u76f8\u540c\u5217\u6570\u7684\u4e24\u4e2a\u4e0d\u540c\u67e5\u8be2\u7684\u6570\u636e\u5408\u5e76\u5728\u4e00\u8d77\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u8054\u5408\u64cd\u4f5c\u7b26\u7528\u4e8e\u4ece\u5176\u4ed6\u8868\u4e2d\u83b7\u53d6\u6570\u636e\u3002<\/p>\n<p>\u8f93\u5165\u6570\u636e\uff1a2\u8054\u5408\u9009\u62e9tbluser\u8868\u4e2d\u7684\u7528\u6237\u540d\u548c\u5bc6\u7801\u3002<\/p>\n<p>\u67e5\u8be2\uff1a\u4ecetbl_employee\u8868\u4e2d\u9009\u62e9first_name\u3001last_name\uff0c\u5176\u4e2dempId=2\uff1b\u5e76\u8054\u5408\u67e5\u8be2\u4ecetbluser\u8868\u4e2d\u9009\u62e9username\u3001password\u3002<\/p>\n<p>\u8bf7\u6ce8\u610f\uff0c\u4e3a\u4e86\u6ee1\u8db3\u60a8\u7684\u9700\u6c42\uff0c\u6211\u63d0\u4f9b\u7684\u7ffb\u8bd1\u662f\u57fa\u4e8e\u8bed\u53e5\u7684\u5b57\u9762\u610f\u601d\uff0c\u5e76\u4e0d\u80fd\u4fdd\u8bc1\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u7684\u51c6\u786e\u6027\u3002<\/p>\n<p>\u4f7f\u7528\u57fa\u4e8e\u8054\u5408\u7684SQL\u6ce8\u5165\uff0c\u653b\u51fb\u8005\u53ef\u4ee5\u83b7\u53d6\u7528\u6237\u51ed\u8bc1\u3002<\/p>\n<h3>3. \u57fa\u4e8e\u65f6\u95f4\u7684SQL\u6ce8\u5165\u653b\u51fb<\/h3>\n<p>\u5728\u57fa\u4e8e\u65f6\u95f4\u7684SQL\u6ce8\u5165\u4e2d\uff0c\u4f1a\u5c06\u7279\u6b8a\u51fd\u6570\u6ce8\u5165\u5230\u67e5\u8be2\u4e2d\uff0c\u8fd9\u4e9b\u51fd\u6570\u53ef\u4ee5\u6682\u505c\u6267\u884c\u4e00\u6bb5\u6307\u5b9a\u7684\u65f6\u95f4\u3002\u8fd9\u79cd\u653b\u51fb\u4f1a\u4f7f\u6570\u636e\u5e93\u670d\u52a1\u5668\u51cf\u901f\u3002\u901a\u8fc7\u5f71\u54cd\u6570\u636e\u5e93\u670d\u52a1\u5668\u7684\u6027\u80fd\uff0c\u5b83\u53ef\u80fd\u5bfc\u81f4\u5e94\u7528\u7a0b\u5e8f\u5d29\u6e83\u3002\u4f8b\u5982\uff0c\u5728MySQL\u4e2d\uff1a<\/p>\n<p>\u8f93\u5165\u6570\u636e\uff1a2 + \u7761\u7720(5)<\/p>\n<p>\u67e5\u8be2\uff1a\u4ecetbl_employee\u8868\u4e2d\u9009\u62e9emp_id\uff0cfirst_name\uff0clast_name\uff0c\u5176\u4e2dempId=2 + SLEEP(5)\u3002<\/p>\n<p>\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u67e5\u8be2\u6267\u884c\u5c06\u4f1a\u6682\u505c5\u79d2\u949f\u3002<\/p>\n<h3>4. \u57fa\u4e8e\u9519\u8bef\u7684SQL\u6ce8\u5165<\/h3>\n<p>\u5728\u8fd9\u79cd\u53d8\u4f53\u4e2d\uff0c\u653b\u51fb\u8005\u8bd5\u56fe\u4ece\u6570\u636e\u5e93\u4e2d\u83b7\u53d6\u9519\u8bef\u4ee3\u7801\u548c\u4fe1\u606f\u3002\u653b\u51fb\u8005\u4f1a\u6ce8\u5165\u8bed\u6cd5\u4e0a\u4e0d\u6b63\u786e\u7684SQL\uff0c\u4ee5\u4fbf\u6570\u636e\u5e93\u670d\u52a1\u5668\u8fd4\u56de\u9519\u8bef\u4ee3\u7801\u548c\u4fe1\u606f\uff0c\u4ece\u800c\u83b7\u5f97\u6570\u636e\u5e93\u548c\u7cfb\u7edf\u4fe1\u606f\u3002<\/p>\n<h2>Java SQL\u6ce8\u5165\u793a\u4f8b<\/h2>\n<p>\u6211\u4eec\u5c06\u4f7f\u7528\u4e00\u4e2a\u7b80\u5355\u7684Java Web\u5e94\u7528\u7a0b\u5e8f\u6765\u6f14\u793aSQL\u6ce8\u5165\u3002\u6211\u4eec\u6709\u4e00\u4e2aLogin.html\u6587\u4ef6\uff0c\u8fd9\u662f\u4e00\u4e2a\u57fa\u672c\u7684\u767b\u5f55\u9875\u9762\uff0c\u7528\u4e8e\u63a5\u6536\u7528\u6237\u7684\u7528\u6237\u540d\u548c\u5bc6\u7801\uff0c\u5e76\u5c06\u5176\u63d0\u4ea4\u7ed9LoginServlet\u3002<\/p>\n<p>LoginServlet\u4ece\u8bf7\u6c42\u4e2d\u83b7\u53d6\u7528\u6237\u540d\u548c\u5bc6\u7801\uff0c\u5e76\u5c06\u5b83\u4eec\u4e0e\u6570\u636e\u5e93\u4e2d\u7684\u503c\u8fdb\u884c\u9a8c\u8bc1\u3002\u5982\u679c\u9a8c\u8bc1\u6210\u529f\uff0c\u5219Servlet\u5c06\u7528\u6237\u91cd\u5b9a\u5411\u5230\u4e3b\u9875\uff1b\u5426\u5219\uff0c\u5b83\u5c06\u8fd4\u56de\u4e00\u4e2a\u9519\u8bef\u6d88\u606f\u3002<\/p>\n<p>\u767b\u5f55\u9875\u9762.html\u4ee3\u7801:<\/p>\n<pre class=\"post-pre\"><code><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<\/span> <span class=\"token attr-name\">lang<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>en<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>Sql Injection Demo<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>form<\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>frmLogin<span class=\"token punctuation\">\"<\/span><\/span> <span class=\"token attr-name\">method<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>POST<span class=\"token punctuation\">\"<\/span><\/span> <span class=\"token attr-name\">action<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>https:\/\/localhost:8080\/Web1\/LoginServlet<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>table<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>tr<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>td<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>Username<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>td<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>td<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>text<span class=\"token punctuation\">\"<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>username<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>td<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>tr<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>tr<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>td<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>Password<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>td<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>td<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>input<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>password<span class=\"token punctuation\">\"<\/span><\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>password<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>td<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>tr<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>tr<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>td<\/span> <span class=\"token attr-name\">colspan<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>2<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>button<\/span> <span class=\"token attr-name\">type<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>submit<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span>Login<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>button<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>td<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>tr<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>table<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>form<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<\/code><\/pre>\n<p>LoginServlet.java\u4ee3\u7801\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>journaldev<span class=\"token punctuation\">.<\/span>examples<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">IOException<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>sql<span class=\"token punctuation\">.<\/span><\/span><span class=\"token operator\">*<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">javax<span class=\"token punctuation\">.<\/span>servlet<span class=\"token punctuation\">.<\/span><\/span><span class=\"token operator\">*<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">javax<span class=\"token punctuation\">.<\/span>servlet<span class=\"token punctuation\">.<\/span>annotation<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">WebServlet<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">javax<span class=\"token punctuation\">.<\/span>servlet<span class=\"token punctuation\">.<\/span>http<span class=\"token punctuation\">.<\/span><\/span><span class=\"token operator\">*<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token annotation punctuation\">@WebServlet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"\/LoginServlet\"<\/span><span class=\"token punctuation\">)<\/span>\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LoginServlet<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">HttpServlet<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">static<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token class-name\">Class<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"com.mysql.jdbc.Driver\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">doPost<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">HttpServletRequest<\/span> request<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HttpServletResponse<\/span> response<span class=\"token punctuation\">)<\/span>\r\n            <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">ServletException<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">boolean<\/span> success <span class=\"token operator\">=<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">String<\/span> username <span class=\"token operator\">=<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"username\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">String<\/span> password <span class=\"token operator\">=<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"password\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token comment\">\/\/ Unsafe query which uses string concatenation<\/span>\r\n        <span class=\"token class-name\">String<\/span> query <span class=\"token operator\">=<\/span> <span class=\"token string\">\"select * from tbluser where username='\"<\/span> <span class=\"token operator\">+<\/span> username <span class=\"token operator\">+<\/span> <span class=\"token string\">\"' and password = '\"<\/span> <span class=\"token operator\">+<\/span> password <span class=\"token operator\">+<\/span> <span class=\"token string\">\"'\"<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">Connection<\/span> conn <span class=\"token operator\">=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">Statement<\/span> stmt <span class=\"token operator\">=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span>\r\n            conn <span class=\"token operator\">=<\/span> <span class=\"token class-name\">DriverManager<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"jdbc:mysql:\/\/127.0.0.1:3306\/user\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"root\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"root\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n            stmt <span class=\"token operator\">=<\/span> conn<span class=\"token punctuation\">.<\/span><span class=\"token function\">createStatement<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n            <span class=\"token class-name\">ResultSet<\/span> rs <span class=\"token operator\">=<\/span> stmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">executeQuery<\/span><span class=\"token punctuation\">(<\/span>query<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>rs<span class=\"token punctuation\">.<\/span><span class=\"token function\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n                <span class=\"token comment\">\/\/ Login Successful if match is found<\/span>\r\n                success <span class=\"token operator\">=<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span>\r\n            <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span>\r\n                stmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n                conn<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>success<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            response<span class=\"token punctuation\">.<\/span><span class=\"token function\">sendRedirect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"home.html\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span>\r\n            response<span class=\"token punctuation\">.<\/span><span class=\"token function\">sendRedirect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"login.html?error=1\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u6570\u636e\u5e93\u67e5\u8be2[MySQL]\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">create<\/span> <span class=\"token keyword\">database<\/span> <span class=\"token keyword\">user<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">create<\/span> <span class=\"token keyword\">table<\/span> tbluser<span class=\"token punctuation\">(<\/span>username <span class=\"token keyword\">varchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">32<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">primary<\/span> <span class=\"token keyword\">key<\/span><span class=\"token punctuation\">,<\/span> password <span class=\"token keyword\">varchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">32<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">insert<\/span> <span class=\"token keyword\">into<\/span> tbluser <span class=\"token punctuation\">(<\/span>username<span class=\"token punctuation\">,<\/span>password<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">values<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">'john'<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">'secret'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">insert<\/span> <span class=\"token keyword\">into<\/span> tbluser <span class=\"token punctuation\">(<\/span>username<span class=\"token punctuation\">,<\/span>password<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">values<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">'mike'<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">'pass10'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<h3>\u5f53\u5728\u767b\u5f55\u9875\u9762\u8f93\u5165\u6709\u6548\u7684\u7528\u6237\u540d\u548c\u5bc6\u7801\u65f6\u3002<\/h3>\n<p>\u8acb\u8f38\u5165\u7528\u6236\u540d\u7a31\uff1a\u7d04\u7ff0<\/p>\n<p>\u8f93\u5165\u7528\u6237\u540d\uff1a\u79d8\u5bc6<\/p>\n<p>\u67e5\u8be2\uff1a\u9009\u62e9tbluser\u8868\u4e2d\u6240\u6709\u4fe1\u606f\uff0c\u5176\u4e2dusername\u4e3a\u2018john\u2019\u4e14password\u4e3a\u2018secret\u2019\u3002<\/p>\n<p>\u7ed3\u679c\uff1a\u7528\u6237\u540d\u548c\u5bc6\u7801\u5728\u6570\u636e\u5e93\u4e2d\u5b58\u5728\uff0c\u56e0\u6b64\u8eab\u4efd\u9a8c\u8bc1\u6210\u529f\u3002\u7528\u6237\u5c06\u88ab\u91cd\u5b9a\u5411\u5230\u4e3b\u9875\u3002<\/p>\n<h3>2. \u5229\u7528 SQL \u6ce8\u5165\u672a\u7ecf\u6388\u6743\u5730\u8bbf\u95ee\u7cfb\u7edf<\/h3>\n<p>\u8f93\u5165\u7528\u6237\u540d\uff1adummy<\/p>\n<p>\u8f93\u5165\u5bc6\u7801\uff1a&#8217; \u6216 &#8216;1&#8217;=&#8217;1&#8217;\u3002<\/p>\n<p>\u67e5\u8be2\uff1a\u4ecetbluser\u8868\u4e2d\u9009\u62e9\u6240\u6709\u6570\u636e\uff0c\u5176\u4e2d\u7528\u6237\u540d\u4e3a&#8217;dummy&#8217;\u4e14\u5bc6\u7801\u4e3a\u7a7a\u6216\u8005&#8217;1&#8217;=&#8217;1&#8217;\u3002<\/p>\n<p>\u7ed3\u679c\uff1a\u8f93\u5165\u7684\u7528\u6237\u540d\u548c\u5bc6\u7801\u5728\u6570\u636e\u5e93\u4e2d\u4e0d\u5b58\u5728\uff0c\u4f46\u8eab\u4efd\u9a8c\u8bc1\u6210\u529f\u3002\u4e3a\u4ec0\u4e48\uff1f<\/p>\n<p>\u56e0\u4e3a\u6211\u4eec\u8f93\u5165\u4e86 \u2019 or \u20181\u2019=&#8217;1 \u4f5c\u4e3a\u5bc6\u7801\uff0c\u6240\u4ee5\u51fa\u73b0\u4e86SQL\u6ce8\u5165\u95ee\u9898\u3002\u67e5\u8be2\u6761\u4ef6\u6709\u4e09\u79cd\u60c5\u51b5\u3002<\/p>\n<ol>\u7528\u6237\u540d\u4e3a&#8217;dummy&#8217;\uff1a\u7531\u4e8e\u8868\u4e2d\u6ca1\u6709\u7528\u6237\u540d\u4e3adummy\u7684\u7528\u6237\uff0c\u5b83\u5c06\u88ab\u8bc4\u4f30\u4e3afalse\u3002<br \/>\n\u5bc6\u7801\u4e3a&#8221;\uff1a\u7531\u4e8e\u8868\u4e2d\u6ca1\u6709\u7a7a\u5bc6\u7801\uff0c\u5b83\u5c06\u88ab\u8bc4\u4f30\u4e3afalse\u3002<br \/>\n&#8216;1&#8217;=&#8217;1&#8217;\uff1a\u7531\u4e8e\u8fd9\u662f\u9759\u6001\u5b57\u7b26\u4e32\u6bd4\u8f83\uff0c\u5b83\u5c06\u88ab\u8bc4\u4f30\u4e3atrue\u3002<\/ol>\n<p>\u73b0\u5728\u5c06\u6240\u67093\u4e2a\u6761\u4ef6\u8fdb\u884c\u7ec4\u5408\uff0c\u5373\u5047\u548c\u5047\u6216\u771f=> \u6700\u7ec8\u7ed3\u679c\u5c06\u4e3a\u771f\u3002<\/p>\n<p>\u5728\u4e0a\u8ff0\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u4f7f\u7528\u5e03\u5c14\u8868\u8fbe\u5f0f\u6765\u8fdb\u884cSQL\u6ce8\u5165\u3002\u8fd8\u6709\u5176\u4ed6\u4e00\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u8fdb\u884cSQL\u6ce8\u5165\u3002\u5728\u4e0b\u4e00\u90e8\u5206\u4e2d\uff0c\u6211\u4eec\u5c06\u770b\u5230\u5982\u4f55\u5728\u6211\u4eec\u7684Java\u5e94\u7528\u7a0b\u5e8f\u4e2d\u9884\u9632SQL\u6ce8\u5165\u3002<\/p>\n<h2>\u5728Java\u4ee3\u7801\u4e2d\u9632\u6b62SQL\u6ce8\u5165<\/h2>\n<p>\u4f7f\u7528\u9884\u7f16\u8bd1\u8bed\u53e5\uff08PreparedStatement\uff09\u800c\u4e0d\u662f\u8bed\u53e5\uff08Statement\uff09\u6765\u6267\u884c\u67e5\u8be2\u662f\u6700\u7b80\u5355\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<p>\u6211\u4eec\u901a\u8fc7PreparedStatement\u7684setter\u65b9\u6cd5\u5c06\u7528\u6237\u540d\u548c\u5bc6\u7801\u63d0\u4f9b\u7ed9\u67e5\u8be2\uff0c\u800c\u4e0d\u662f\u5c06\u5b83\u4eec\u8fde\u63a5\u6210\u67e5\u8be2\u8bed\u53e5\u3002<\/p>\n<p>\u73b0\u5728\uff0c\u4ece\u8bf7\u6c42\u4e2d\u63a5\u6536\u5230\u7684\u7528\u6237\u540d\u548c\u5bc6\u7801\u7684\u503c\u88ab\u89c6\u4e3a\u4ec5\u4ec5\u662f\u6570\u636e\uff0c\u56e0\u6b64\u4e0d\u4f1a\u53d1\u751fSQL\u6ce8\u5165\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u4fee\u6539\u540e\u7684servlet\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token class-name\">String<\/span> query <span class=\"token operator\">=<\/span> <span class=\"token string\">\"select * from tbluser where username=? and password = ?\"<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token class-name\">Connection<\/span> conn <span class=\"token operator\">=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token class-name\">PreparedStatement<\/span> stmt <span class=\"token operator\">=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span>\r\n    conn <span class=\"token operator\">=<\/span> <span class=\"token class-name\">DriverManager<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"jdbc:mysql:\/\/127.0.0.1:3306\/user\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"root\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"root\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    stmt <span class=\"token operator\">=<\/span> conn<span class=\"token punctuation\">.<\/span><span class=\"token function\">prepareStatement<\/span><span class=\"token punctuation\">(<\/span>query<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    stmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">setString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> username<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    stmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">setString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> password<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token class-name\">ResultSet<\/span> rs <span class=\"token operator\">=<\/span> stmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">executeQuery<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>rs<span class=\"token punctuation\">.<\/span><span class=\"token function\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token comment\">\/\/ Login Successful if match is found<\/span>\r\n        success <span class=\"token operator\">=<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n    rs<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span>\r\n        stmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        conn<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u4e86\u89e3\u4e00\u4e0b\u8fd9\u4e2a\u6848\u4f8b\u4e2d\u6b63\u5728\u53d1\u751f\u7684\u4e8b\u60c5\u3002<\/p>\n<p>\u67e5\u8be2\uff1a\u4ecetbluser\u8868\u4e2d\u9009\u62e9*\uff0c\u5176\u4e2dusername =?\uff0cpassword =?<\/p>\n<p>\u4ee5\u4e0a\u67e5\u8be2\u4e2d\u7684\u95ee\u53f7(?)\u88ab\u79f0\u4e3a\u4f4d\u7f6e\u53c2\u6570\u3002\u4ee5\u4e0a\u67e5\u8be2\u4e2d\u67092\u4e2a\u4f4d\u7f6e\u53c2\u6570\u3002\u6211\u4eec\u4e0d\u5c06\u7528\u6237\u540d\u548c\u5bc6\u7801\u8fde\u63a5\u5230\u67e5\u8be2\u4e2d\u3002\u6211\u4eec\u4f7f\u7528PreparedStatement\u4e2d\u63d0\u4f9b\u7684\u65b9\u6cd5\u6765\u63d0\u4f9b\u7528\u6237\u8f93\u5165\u3002<\/p>\n<p>\u6211\u4eec\u4f7f\u7528stmt.setString(1, username)\u5c06\u7b2c\u4e00\u4e2a\u53c2\u6570\u8bbe\u7f6e\u4e3a\u7528\u6237\u540d\uff0c\u5e76\u4f7f\u7528stmt.setString(2, password)\u5c06\u7b2c\u4e8c\u4e2a\u53c2\u6570\u8bbe\u7f6e\u4e3a\u5bc6\u7801\u3002\u5e95\u5c42\u7684JDBC API\u8d1f\u8d23\u5bf9\u8fd9\u4e9b\u503c\u8fdb\u884c\u5904\u7406\uff0c\u4ee5\u907f\u514dSQL\u6ce8\u5165\u7684\u60c5\u51b5\u53d1\u751f\u3002<\/p>\n<h2>\u907f\u514dSQL\u6ce8\u5165\u7684\u6700\u4f73\u5b9e\u8df5<\/h2>\n<ol>\u5728\u67e5\u8be2\u4e4b\u524d\u9a8c\u8bc1\u6570\u636e\u7684\u6709\u6548\u6027\u3002<br \/>\n\u4e0d\u8981\u5c06\u5e38\u7528\u8bcd\u4f5c\u4e3a\u8868\u540d\u6216\u5217\u540d\u3002\u4f8b\u5982\uff0c\u8bb8\u591a\u5e94\u7528\u7a0b\u5e8f\u4f7f\u7528tbluser\u6216tblaccount\u6765\u5b58\u50a8\u7528\u6237\u6570\u636e\u3002email\uff0cfirstname\uff0clastname\u662f\u5e38\u89c1\u7684\u5217\u540d\u3002<br \/>\n\u4e0d\u8981\u76f4\u63a5\u5c06\u7528\u6237\u8f93\u5165\u7684\u6570\u636e\u8fde\u63a5\u8d77\u6765\u521b\u5efaSQL\u67e5\u8be2\u3002<br \/>\n\u5728\u5e94\u7528\u7a0b\u5e8f\u7684\u6570\u636e\u5c42\u4e2d\u4f7f\u7528Hibernate\u548cSpring Data JPA\u7b49\u6846\u67b6\u3002<br \/>\n\u5728\u67e5\u8be2\u4e2d\u4f7f\u7528\u4f4d\u7f6e\u53c2\u6570\u3002\u5982\u679c\u4f7f\u7528\u666e\u901a\u7684JDBC\uff0c\u5219\u4f7f\u7528PreparedStatement\u6765\u6267\u884c\u67e5\u8be2\u3002<br \/>\n\u901a\u8fc7\u6743\u9650\u548c\u6388\u6743\u9650\u5236\u5e94\u7528\u7a0b\u5e8f\u5bf9\u6570\u636e\u5e93\u7684\u8bbf\u95ee\u3002<br \/>\n\u4e0d\u8981\u5c06\u654f\u611f\u7684\u9519\u8bef\u4ee3\u7801\u548c\u4fe1\u606f\u8fd4\u56de\u7ed9\u6700\u7ec8\u7528\u6237\u3002<br \/>\n\u8fdb\u884c\u9002\u5f53\u7684\u4ee3\u7801\u5ba1\u67e5\uff0c\u4ee5\u786e\u4fdd\u6ca1\u6709\u5f00\u53d1\u4eba\u5458\u610f\u5916\u7f16\u5199\u4e0d\u5b89\u5168\u7684SQL\u4ee3\u7801\u3002<br \/>\n\u4f7f\u7528\u50cfSQLMap\u8fd9\u6837\u7684\u5de5\u5177\u6765\u67e5\u627e\u548c\u4fee\u590d\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684SQL\u6ce8\u5165\u6f0f\u6d1e\u3002<\/ol>\n<p>Java SQL\u6ce8\u5165\u7684\u5185\u5bb9\u5c31\u662f\u8fd9\u4e9b\u4e86\uff0c\u6211\u5e0c\u671b\u6ca1\u6709\u9057\u6f0f\u4efb\u4f55\u91cd\u8981\u7684\u5185\u5bb9\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u4ece\u4ee5\u4e0b\u94fe\u63a5\u4e0b\u8f7d\u793a\u4f8b\u7684Java Web\u5e94\u7528\u7a0b\u5e8f\u9879\u76ee\u3002<\/p>\n<p>SQL\u6ce8\u5165\u7684Java\u9879\u76ee<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ec0\u4e48\u662fSQL\u6ce8\u5165\uff1f SQL\u6ce8\u5165\u662f\u5341\u5927\u7f51\u7edc\u5e94\u7528\u7a0b\u5e8f\u6f0f\u6d1e\u4e4b\u4e00\u3002\u7b80\u5355\u6765\u8bf4\uff0cSQL\u6ce8\u5165\u6307\u7684\u662f\u901a\u8fc7\u7528\u6237\u8f93\u5165\u7684\u6570\u636e\u5728\u67e5\u8be2\u4e2d [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-50739","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java\u4e2d\u7684SQL\u6ce8\u5165\u53ca\u5982\u4f55\u8f7b\u677e\u9884\u9632 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u4e2d\u7684sql\u6ce8\u5165\u53ca\u5982\u4f55\u8f7b\u677e\u9884\u9632\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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