{"id":31255,"date":"2023-06-23T13:24:54","date_gmt":"2022-12-08T00:24:19","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e8%af%bb%e5%8f%96json\/"},"modified":"2025-08-12T23:05:24","modified_gmt":"2025-08-12T15:05:24","slug":"%e4%bd%bf%e7%94%a8java%e8%af%bb%e5%8f%96json","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e8%af%bb%e5%8f%96json\/","title":{"rendered":"\u4f7f\u7528Java\u8bfb\u53d6JSON"},"content":{"rendered":"<p>\u6211\u4eec\u4f7f\u7528Jackson\u6765\u8bfb\u53d6\u4e0b\u9762\u7684JSON\u6587\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"p\">{<\/span>\r\n  <span class=\"nl\">\"t2381\"<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nl\">\"name\"<\/span><span class=\"p\">:<\/span> <span class=\"s2\">\"\u540d\u53e4\u5c4b\"<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"nl\">\"population\"<\/span><span class=\"p\">:<\/span> <span class=\"s2\">\"74125\"<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"nl\">\"date_mod\"<\/span><span class=\"p\">:<\/span> <span class=\"s2\">\"2009-1-7\"<\/span>\r\n  <span class=\"p\">},<\/span>\r\n  <span class=\"nl\">\"t0922\"<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nl\">\"name\"<\/span><span class=\"p\">:<\/span> <span class=\"s2\">\"\u5c0f\u5c71\"<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"nl\">\"population\"<\/span><span class=\"p\">:<\/span> <span class=\"s2\">\"17982\"<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"nl\">\"date_mod\"<\/span><span class=\"p\">:<\/span> <span class=\"s2\">\"2009-5-19\"<\/span>\r\n  <span class=\"p\">},<\/span>\r\n  <span class=\"nl\">\"t0923\"<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nl\">\"name\"<\/span><span class=\"p\">:<\/span> <span class=\"s2\">\"\u4f50\u91ce\"<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"nl\">\"population\"<\/span><span class=\"p\">:<\/span> <span class=\"s2\">\"46819\"<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"nl\">\"date_mod\"<\/span><span class=\"p\">:<\/span> <span class=\"s2\">\"2009-3-28\"<\/span>\r\n  <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u4e0b\u8f7dJackson\u7684jar\u6587\u4ef6<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">SRC<\/span><span class=\"o\">=<\/span><span class=\"s2\">\"https:\/\/repo1.maven.org\/maven2\/com\/fasterxml\/jackson\/core\"<\/span>\r\n<span class=\"c\">#<\/span>\r\nwget <span class=\"nv\">$SRC<\/span>\/jackson-annotations\/2.14.2\/jackson-annotations-2.14.2.jar\r\nwget <span class=\"nv\">$SRC<\/span>\/jackson-core\/2.14.2\/jackson-core-2.14.2.jar\r\nwget <span class=\"nv\">$SRC<\/span>\/jackson-databind\/2.14.2\/jackson-databind-2.14.2.jar\r\n<span class=\"c\">#<\/span>\r\n<\/code><\/pre>\n<h2>\u7f16\u7a0b<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ -----------------------------------------------------------------------<\/span>\r\n<span class=\"cm\">\/*\r\n\tjson_read.java\r\n\r\n\r\n\t\t\t\t\t\t\tFeb\/10\/2023\r\n*\/<\/span>\r\n<span class=\"c1\">\/\/ -----------------------------------------------------------------------<\/span>\r\n<span class=\"kn\">import<\/span>  <span class=\"nn\">java.util.HashMap<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">com.fasterxml.jackson.core.type.TypeReference<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">com.fasterxml.jackson.databind.ObjectMapper<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">json_read<\/span> <span class=\"o\">{<\/span>\r\n\t <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"kd\">throws<\/span> <span class=\"nc\">Exception<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">err<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span> <span class=\"o\">(<\/span><span class=\"s\">\"*** \u958b\u59cb ***\"<\/span><span class=\"o\">);<\/span>\r\n\t\t<span class=\"nc\">String<\/span> <span class=\"n\">file_in<\/span> <span class=\"o\">=<\/span> <span class=\"n\">args<\/span><span class=\"o\">[<\/span><span class=\"mi\">0<\/span><span class=\"o\">];<\/span>\r\n\t\t<span class=\"nc\">TypeReference<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">HashMap<\/span> <span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">HashMap<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;&gt;&gt;<\/span> <span class=\"n\">reference<\/span>\r\n\t\t\t\t\t<span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">TypeReference<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">HashMap<\/span> <span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">HashMap<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;&gt;&gt;<\/span> <span class=\"o\">(){};<\/span>\r\n\t\t  <span class=\"nc\">String<\/span> <span class=\"n\">json<\/span> <span class=\"o\">=<\/span> <span class=\"n\">file_io<\/span><span class=\"o\">.<\/span><span class=\"na\">file_to_str_proc<\/span> <span class=\"o\">(<\/span><span class=\"n\">file_in<\/span><span class=\"o\">);<\/span>\r\n\r\n\t\t   <span class=\"nc\">ObjectMapper<\/span> <span class=\"n\">mapper<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">ObjectMapper<\/span><span class=\"o\">();<\/span>\r\n\t\t    <span class=\"nc\">HashMap<\/span> <span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">HashMap<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;&gt;<\/span> <span class=\"n\">dict_aa<\/span> <span class=\"o\">=<\/span> <span class=\"n\">mapper<\/span><span class=\"o\">.<\/span><span class=\"na\">readValue<\/span><span class=\"o\">(<\/span><span class=\"n\">json<\/span><span class=\"o\">,<\/span> <span class=\"n\">reference<\/span><span class=\"o\">);<\/span>\r\n\t\t    <span class=\"n\">text_manipulate<\/span><span class=\"o\">.<\/span><span class=\"na\">dict_display_proc<\/span> <span class=\"o\">(<\/span><span class=\"n\">dict_aa<\/span><span class=\"o\">);<\/span>\r\n\t\t    <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">err<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span> <span class=\"o\">(<\/span><span class=\"s\">\"*** \u958b\u59cb ***\"<\/span><span class=\"o\">);<\/span>\r\n\t\t    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n\r\n<span class=\"c1\">\/\/ ----------------------------------------------------------------------<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ -----------------------------------------------------------------------<\/span>\r\n<span class=\"cm\">\/*\r\n        file_io.java\r\n\r\n                                        Jan\/10\/2020\r\n*\/<\/span>\r\n<span class=\"c1\">\/\/ -----------------------------------------------------------------------<\/span>\r\n<span class=\"kn\">import<\/span>  <span class=\"nn\">java.io.File<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span>  <span class=\"nn\">java.io.FileReader<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span>  <span class=\"nn\">java.io.BufferedReader<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"c1\">\/\/ -----------------------------------------------------------------------<\/span>\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">file_io<\/span>\r\n<span class=\"o\">{<\/span>\r\n\r\n<span class=\"c1\">\/\/ -----------------------------------------------------------------------<\/span>\r\n<span class=\"kd\">static<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">file_to_str_proc<\/span> <span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">file_in<\/span><span class=\"o\">)<\/span>\r\n<span class=\"o\">{<\/span>\r\n        <span class=\"nc\">String<\/span> <span class=\"n\">str_in<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"\"<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"k\">try<\/span>\r\n                <span class=\"o\">{<\/span>\r\n                <span class=\"nc\">FileReader<\/span> <span class=\"n\">in_file<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">FileReader<\/span> <span class=\"o\">(<\/span><span class=\"n\">file_in<\/span><span class=\"o\">);<\/span>\r\n\r\n                <span class=\"nc\">BufferedReader<\/span>  <span class=\"n\">buff<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">BufferedReader<\/span> <span class=\"o\">(<\/span><span class=\"n\">in_file<\/span><span class=\"o\">);<\/span>\r\n\r\n                <span class=\"nc\">String<\/span>  <span class=\"n\">line<\/span><span class=\"o\">;<\/span>\r\n\r\n                <span class=\"k\">while<\/span> <span class=\"o\">((<\/span><span class=\"n\">line<\/span> <span class=\"o\">=<\/span> <span class=\"n\">buff<\/span><span class=\"o\">.<\/span><span class=\"na\">readLine<\/span> <span class=\"o\">())<\/span> <span class=\"o\">!=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span>\r\n                        <span class=\"o\">{<\/span>\r\n                        <span class=\"n\">str_in<\/span> <span class=\"o\">+=<\/span> <span class=\"n\">line<\/span><span class=\"o\">;<\/span>\r\n                        <span class=\"o\">}<\/span>\r\n                <span class=\"o\">}<\/span>\r\n        <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">Exception<\/span> <span class=\"n\">ee<\/span><span class=\"o\">)<\/span>\r\n                <span class=\"o\">{<\/span>\r\n                <span class=\"n\">ee<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span> <span class=\"o\">();<\/span>\r\n                <span class=\"o\">}<\/span>\r\n\r\n        <span class=\"k\">return<\/span>  <span class=\"n\">str_in<\/span><span class=\"o\">;<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/ -----------------------------------------------------------------------<\/span>\r\n<span class=\"o\">}<\/span>\r\n<span class=\"c1\">\/\/ ----------------------------------------------------------------------<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ -----------------------------------------------------------------------<\/span>\r\n<span class=\"cm\">\/*\r\n        text_manipulate.java\r\n\r\n                                        Jan\/10\/2020\r\n*\/<\/span>\r\n<span class=\"c1\">\/\/ -----------------------------------------------------------------------<\/span>\r\n<span class=\"kn\">import<\/span>  <span class=\"nn\">java.util.HashMap<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span>  <span class=\"nn\">java.util.Set<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span>  <span class=\"nn\">java.util.TreeSet<\/span><span class=\"o\">;<\/span>\r\n\r\n\r\n<span class=\"c1\">\/\/ -----------------------------------------------------------------------<\/span>\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">text_manipulate<\/span>\r\n<span class=\"o\">{<\/span>\r\n\r\n<span class=\"c1\">\/\/ -----------------------------------------------------------------------<\/span>\r\n<span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">dict_display_proc<\/span>\r\n        <span class=\"o\">(<\/span><span class=\"nc\">HashMap<\/span> <span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">HashMap<\/span> <span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;&gt;<\/span> <span class=\"n\">dict_aa<\/span><span class=\"o\">)<\/span>\r\n<span class=\"o\">{<\/span>\r\n        <span class=\"nc\">HashMap<\/span> <span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">dict_unit<\/span>\r\n                                <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">HashMap<\/span> <span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">();<\/span>\r\n\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span> <span class=\"o\">(<\/span><span class=\"n\">dict_aa<\/span><span class=\"o\">.<\/span><span class=\"na\">size<\/span> <span class=\"o\">());<\/span>\r\n\r\n        <span class=\"nc\">Set<\/span> <span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">set_aaa<\/span> <span class=\"o\">=<\/span> <span class=\"n\">dict_aa<\/span><span class=\"o\">.<\/span><span class=\"na\">keySet<\/span> <span class=\"o\">();<\/span>\r\n\r\n        <span class=\"nc\">Set<\/span> <span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">ss<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">TreeSet<\/span> <span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">(<\/span><span class=\"n\">set_aaa<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"k\">for<\/span> <span class=\"o\">(<\/span><span class=\"nc\">Object<\/span> <span class=\"nl\">key_aa:<\/span> <span class=\"n\">ss<\/span><span class=\"o\">)<\/span>\r\n                <span class=\"o\">{<\/span>\r\n                <span class=\"nc\">String<\/span> <span class=\"n\">key<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">)<\/span><span class=\"n\">key_aa<\/span><span class=\"o\">;<\/span>\r\n\r\n                <span class=\"n\">dict_unit<\/span> <span class=\"o\">=<\/span> <span class=\"n\">dict_aa<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span> <span class=\"o\">(<\/span><span class=\"n\">key_aa<\/span><span class=\"o\">);<\/span>\r\n                <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span> <span class=\"o\">(<\/span><span class=\"n\">key_aa<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\"\\t\"<\/span><span class=\"o\">);<\/span>\r\n                <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span> <span class=\"o\">(<\/span><span class=\"n\">dict_unit<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span> <span class=\"o\">(<\/span><span class=\"s\">\"name\"<\/span><span class=\"o\">)<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\"\\t\"<\/span><span class=\"o\">);<\/span>\r\n                <span class=\"nc\">Object<\/span> <span class=\"n\">ppx<\/span> <span class=\"o\">=<\/span> <span class=\"n\">dict_unit<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span> <span class=\"o\">(<\/span><span class=\"s\">\"population\"<\/span><span class=\"o\">);<\/span>\r\n                <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span> <span class=\"o\">(<\/span><span class=\"n\">ppx<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\"\\t\"<\/span><span class=\"o\">);<\/span>\r\n                <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span> <span class=\"o\">(<\/span><span class=\"n\">dict_unit<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span> <span class=\"o\">(<\/span><span class=\"s\">\"date_mod\"<\/span><span class=\"o\">));<\/span>\r\n                <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/ -----------------------------------------------------------------------<\/span>\r\n<span class=\"o\">}<\/span>\r\n<span class=\"c1\">\/\/ -----------------------------------------------------------------------<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>#\r\nexport JAR=..\/jar\r\n#\r\nexport CLASSPATH=.:$(JAR)\/jackson-annotations-2.14.2.jar:$(JAR)\/jackson-core-2.14.2.jar:$(JAR)\/jackson-databind-2.14.2.jar\r\njson_read.class: json_read.java\r\n        javac json_read.java\r\nclean:\r\n        rm -f *.class\r\n<\/code><\/pre>\n<h2>\u7f16\u8bd1<\/p>\n<pre class=\"post-pre\"><code>make\r\n<\/code><\/pre>\n<h2>\u6267\u884c<\/p>\n<pre class=\"post-pre\"><code><span class=\"c\">#<\/span>\r\n<span class=\"nb\">export <\/span><span class=\"nv\">JAR<\/span><span class=\"o\">=<\/span>..\/jar\r\n<span class=\"c\">#<\/span>\r\n<span class=\"nb\">export <\/span><span class=\"nv\">CLASSPATH<\/span><span class=\"o\">=<\/span>.:<span class=\"nv\">$JAR<\/span>\/jackson-annotations-2.14.2.jar:<span class=\"nv\">$JAR<\/span>\/jackson-core-2.14.2.jar:<span class=\"nv\">$JAR<\/span>\/jackson-databind-2.14.2.jar\r\n<span class=\"c\">#<\/span>\r\njava json_read tochigi.json\r\n<\/code><\/pre>\n<h2>\u786e\u8ba4\u7684\u7248\u672c<\/p>\n<pre class=\"post-pre\"><code>$ javac --version\r\njavac 18.0.2-ea\r\n\r\n$ java --version\r\nopenjdk 18.0.2-ea 2022-07-19\r\nOpenJDK Runtime Environment (build 18.0.2-ea+9-Ubuntu-2)\r\nOpenJDK 64-Bit Server VM (build 18.0.2-ea+9-Ubuntu-2, mixed mode, sharing)\r\n<\/code><\/pre>\n<h2>\u76f8\u5173\u4fe1\u606f\u5728Java\u4e2d\u521b\u5efaJSON\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6211\u4eec\u4f7f\u7528Jackson\u6765\u8bfb\u53d6\u4e0b\u9762\u7684JSON\u6587\u4ef6\u3002 { &#8220;t2381&#8221;: { &#8220;name&#8221;: &#8220;\u540d\u53e4\u5c4b&#8221;, &#8220;p [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31255","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"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>\u4f7f\u7528Java\u8bfb\u53d6JSON - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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