{"id":487,"date":"2022-12-09T14:10:33","date_gmt":"2023-07-13T20:52:17","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/jackson-json-java%e8%a7%a3%e6%9e%90%e5%99%a8api%e7%a4%ba%e4%be%8b%e6%95%99%e7%a8%8b\/"},"modified":"2025-08-02T13:14:13","modified_gmt":"2025-08-02T05:14:13","slug":"jackson-json-java%e8%a7%a3%e6%9e%90%e5%99%a8api%e7%a4%ba%e4%be%8b%e6%95%99%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/jackson-json-java%e8%a7%a3%e6%9e%90%e5%99%a8api%e7%a4%ba%e4%be%8b%e6%95%99%e7%a8%8b\/","title":{"rendered":"Java Jackson JSON\u5b8c\u5168\u6307\u5357\uff1aAPI\u4f7f\u7528\u6559\u7a0b\u4e0e\u5b9e\u4f8b\u89e3\u6790"},"content":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aJackson JSON Java\u89e3\u6790\u5668API\u793a\u4f8b\u6559\u7a0b\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002<\/p>\n<p>Jackson JSON Java\u89e3\u6790\u5668\u5728Spring\u6846\u67b6\u4e2d\u4e5f\u975e\u5e38\u53d7\u6b22\u8fce\u3002Java JSON\u5904\u7406API\u4e0d\u592a\u7528\u6237\u53cb\u597d\uff0c\u4e5f\u6ca1\u6709\u63d0\u4f9b\u4eceJSON\u5230Java\u5bf9\u8c61\u4ee5\u53ca\u53cd\u5411\u8f6c\u6362\u7684\u81ea\u52a8\u8f6c\u6362\u529f\u80fd\u3002\u5e78\u8fd0\u7684\u662f\uff0c\u6211\u4eec\u8fd8\u6709\u4e00\u4e9b\u53ef\u7528\u4e8eJSON\u5904\u7406\u7684\u66ff\u4ee3API\u3002\u5728\u4e0a\u4e00\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u4e86\u89e3\u4e86Google Gson API\uff0c\u5e76\u770b\u5230\u4e86\u5b83\u7684\u6613\u7528\u6027\u3002<\/p>\n<h2>Jackson JSON Java\u89e3\u6790\u5668<\/h2>\n<p>\u5728\u6211\u4eec\u7684\u9879\u76ee\u4e2d\u4f7f\u7528Jackson JSON Java API\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u6dfb\u52a0\u5230\u9879\u76ee\u7684\u6784\u5efa\u8def\u5f84\u4e2d\uff0c\u6216\u8005\u5982\u679c\u60a8\u4f7f\u7528\u7684\u662fMaven\uff0c\u53ef\u4ee5\u6dfb\u52a0\u4ee5\u4e0b\u4f9d\u8d56\u9879\u3002<\/p>\n<pre class=\"post-pre\"><code>&lt;dependency&gt;\r\n\t&lt;groupId&gt;com.fasterxml.jackson.core&lt;\/groupId&gt;\r\n\t&lt;artifactId&gt;jackson-databind&lt;\/artifactId&gt;\r\n\t&lt;version&gt;2.2.3&lt;\/version&gt;\r\n&lt;\/dependency&gt;\r\n<\/code><\/pre>\n<p>jackson-databind jar\u4f9d\u8d56\u4e8ejackson-core\u548cjackson-annotations\u5e93\uff0c\u56e0\u6b64\u5982\u679c\u60a8\u76f4\u63a5\u5c06\u5b83\u4eec\u6dfb\u52a0\u5230\u6784\u5efa\u8def\u5f84\u4e2d\uff0c\u8bf7\u786e\u4fdd\u540c\u65f6\u6dfb\u52a0\u6240\u6709\u4e09\u8005\uff0c\u5426\u5219\u4f1a\u5bfc\u81f4\u8fd0\u884c\u65f6\u9519\u8bef\u3002Jackson JSON\u89e3\u6790\u5668API\u63d0\u4f9b\u4e86\u4e00\u79cd\u5c06JSON\u8f6c\u6362\u4e3aPOJO\u5bf9\u8c61\u7684\u7b80\u4fbf\u65b9\u5f0f\uff0c\u5e76\u652f\u6301\u5c06JSON\u6570\u636e\u7b80\u4fbf\u5730\u8f6c\u6362\u4e3aMap\u3002Jackson\u8fd8\u652f\u6301\u6cdb\u578b\uff0c\u5e76\u76f4\u63a5\u5c06\u5176\u4eceJSON\u8f6c\u6362\u4e3a\u5bf9\u8c61\u3002<\/p>\n<h2>\u6770\u514b\u900aJSON\u793a\u4f8b<\/h2>\n<p>\u5bf9\u4e8eJSON\u8f6cPOJO\/Java\u5bf9\u8c61\u7684\u793a\u4f8b\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u4e00\u4e2a\u5177\u6709\u5d4c\u5957\u5bf9\u8c61\u548c\u6570\u7ec4\u7684\u590d\u6742\u793a\u4f8b\u3002\u6211\u4eec\u5c06\u5728java\u5bf9\u8c61\u4e2d\u4f7f\u7528\u6570\u7ec4\u3001\u5217\u8868\u548c\u6620\u5c04\u8fdb\u884c\u8f6c\u6362\u3002\u6211\u4eec\u590d\u6742\u7684json\u5b58\u50a8\u5728\u4e00\u4e2a\u540d\u4e3aemployee.txt\u7684\u6587\u4ef6\u4e2d\uff0c\u5177\u4f53\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n<pre class=\"post-pre\"><code>{\r\n  \"id\": 123,\r\n  \"name\": \"Pankaj\",\r\n  \"permanent\": true,\r\n  \"address\": {\r\n    \"street\": \"Albany Dr\",\r\n    \"city\": \"San Jose\",\r\n    \"zipcode\": 95129\r\n  },\r\n  \"phoneNumbers\": [\r\n    123456,\r\n    987654\r\n  ],\r\n  \"role\": \"Manager\",\r\n  \"cities\": [\r\n    \"Los Angeles\",\r\n    \"New York\"\r\n  ],\r\n  \"properties\": {\r\n    \"age\": \"29 years\",\r\n    \"salary\": \"1000 USD\"\r\n  }\r\n}\r\n<\/code><\/pre>\n<p>\u6211\u4eec\u6709\u4ee5\u4e0b\u4e0eJSON\u6570\u636e\u5bf9\u5e94\u7684Java\u7c7b\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.jackson.model;\r\n\r\npublic class Address {\r\n\t\r\n\tprivate String street;\r\n\tprivate String city;\r\n\tprivate int zipcode;\r\n\t\r\n\tpublic String getStreet() {\r\n\t\treturn street;\r\n\t}\r\n\tpublic void setStreet(String street) {\r\n\t\tthis.street = street;\r\n\t}\r\n\tpublic String getCity() {\r\n\t\treturn city;\r\n\t}\r\n\tpublic void setCity(String city) {\r\n\t\tthis.city = city;\r\n\t}\r\n\tpublic int getZipcode() {\r\n\t\treturn zipcode;\r\n\t}\r\n\tpublic void setZipcode(int zipcode) {\r\n\t\tthis.zipcode = zipcode;\r\n\t}\r\n\t\r\n\t@Override\r\n\tpublic String toString(){\r\n\t\treturn getStreet() + \", \"+getCity()+\", \"+getZipcode();\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u5730\u5740\u7c7b\u5bf9\u5e94\u4e8e\u6839JSON\u6570\u636e\u4e2d\u7684\u5185\u90e8\u5bf9\u8c61\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.jackson.model;\r\n\r\nimport java.util.Arrays;\r\nimport java.util.List;\r\nimport java.util.Map;\r\n\r\npublic class Employee {\r\n\r\n\tprivate int id;\r\n\tprivate String name;\r\n\tprivate boolean permanent;\r\n\tprivate Address address;\r\n\tprivate long[] phoneNumbers;\r\n\tprivate String role;\r\n\tprivate List&lt;String&gt; cities;\r\n\tprivate Map&lt;String, String&gt; properties;\r\n\t\r\n\tpublic int getId() {\r\n\t\treturn id;\r\n\t}\r\n\tpublic void setId(int id) {\r\n\t\tthis.id = id;\r\n\t}\r\n\tpublic String getName() {\r\n\t\treturn name;\r\n\t}\r\n\tpublic void setName(String name) {\r\n\t\tthis.name = name;\r\n\t}\r\n\tpublic boolean isPermanent() {\r\n\t\treturn permanent;\r\n\t}\r\n\tpublic void setPermanent(boolean permanent) {\r\n\t\tthis.permanent = permanent;\r\n\t}\r\n\tpublic Address getAddress() {\r\n\t\treturn address;\r\n\t}\r\n\tpublic void setAddress(Address address) {\r\n\t\tthis.address = address;\r\n\t}\r\n\tpublic long[] getPhoneNumbers() {\r\n\t\treturn phoneNumbers;\r\n\t}\r\n\tpublic void setPhoneNumbers(long[] phoneNumbers) {\r\n\t\tthis.phoneNumbers = phoneNumbers;\r\n\t}\r\n\tpublic String getRole() {\r\n\t\treturn role;\r\n\t}\r\n\tpublic void setRole(String role) {\r\n\t\tthis.role = role;\r\n\t}\r\n\t\r\n\t@Override\r\n\tpublic String toString(){\r\n\t\tStringBuilder sb = new StringBuilder();\r\n\t\tsb.append(\"***** Employee Details *****\\n\");\r\n\t\tsb.append(\"ID=\"+getId()+\"\\n\");\r\n\t\tsb.append(\"Name=\"+getName()+\"\\n\");\r\n\t\tsb.append(\"Permanent=\"+isPermanent()+\"\\n\");\r\n\t\tsb.append(\"Role=\"+getRole()+\"\\n\");\r\n\t\tsb.append(\"Phone Numbers=\"+Arrays.toString(getPhoneNumbers())+\"\\n\");\r\n\t\tsb.append(\"Address=\"+getAddress()+\"\\n\");\r\n\t\tsb.append(\"Cities=\"+Arrays.toString(getCities().toArray())+\"\\n\");\r\n\t\tsb.append(\"Properties=\"+getProperties()+\"\\n\");\r\n\t\tsb.append(\"*****************************\");\r\n\t\t\r\n\t\treturn sb.toString();\r\n\t}\r\n\tpublic List&lt;String&gt; getCities() {\r\n\t\treturn cities;\r\n\t}\r\n\tpublic void setCities(List&lt;String&gt; cities) {\r\n\t\tthis.cities = cities;\r\n\t}\r\n\tpublic Map&lt;String, String&gt; getProperties() {\r\n\t\treturn properties;\r\n\t}\r\n\tpublic void setProperties(Map&lt;String, String&gt; properties) {\r\n\t\tthis.properties = properties;\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u5458\u5de5\u662f\u8868\u793a\u6839JSON\u5bf9\u8c61\u7684Java bean\u3002\u73b0\u5728\u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u4f7f\u7528Jackson JSON\u89e3\u6790\u5668API\u5c06JSON\u8f6c\u6362\u4e3aJava\u5bf9\u8c61\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.jackson.json;\r\n\r\nimport java.io.File;\r\nimport java.io.IOException;\r\nimport java.io.StringWriter;\r\nimport java.nio.file.Files;\r\nimport java.nio.file.Paths;\r\nimport java.util.ArrayList;\r\nimport java.util.HashMap;\r\nimport java.util.Iterator;\r\nimport java.util.List;\r\nimport java.util.Map;\r\n\r\nimport com.fasterxml.jackson.core.type.TypeReference;\r\nimport com.fasterxml.jackson.databind.JsonNode;\r\nimport com.fasterxml.jackson.databind.ObjectMapper;\r\nimport com.fasterxml.jackson.databind.SerializationFeature;\r\nimport com.fasterxml.jackson.databind.node.ObjectNode;\r\nimport com.Olivia.jackson.model.Address;\r\nimport com.Olivia.jackson.model.Employee;\r\n\r\n\r\npublic class JacksonObjectMapperExample {\r\n\r\n\tpublic static void main(String[] args) throws IOException {\r\n\t\t\r\n\t\t\/\/read json file data to String\r\n\t\tbyte[] jsonData = Files.readAllBytes(Paths.get(\"employee.txt\"));\r\n\t\t\r\n\t\t\/\/create ObjectMapper instance\r\n\t\tObjectMapper objectMapper = new ObjectMapper();\r\n\t\t\r\n\t\t\/\/convert json string to object\r\n\t\tEmployee emp = objectMapper.readValue(jsonData, Employee.class);\r\n\t\t\r\n\t\tSystem.out.println(\"Employee Object\\n\"+emp);\r\n\t\t\r\n\t\t\/\/convert Object to json string\r\n\t\tEmployee emp1 = createEmployee();\r\n\t\t\/\/configure Object mapper for pretty print\r\n\t\tobjectMapper.configure(SerializationFeature.INDENT_OUTPUT, true);\r\n\t\t\r\n\t\t\/\/writing to console, can write to any output stream such as file\r\n\t\tStringWriter stringEmp = new StringWriter();\r\n\t\tobjectMapper.writeValue(stringEmp, emp1);\r\n\t\tSystem.out.println(\"Employee JSON is\\n\"+stringEmp);\r\n\t}\r\n\t\r\n\tpublic static Employee createEmployee() {\r\n\r\n\t\tEmployee emp = new Employee();\r\n\t\temp.setId(100);\r\n\t\temp.setName(\"David\");\r\n\t\temp.setPermanent(false);\r\n\t\temp.setPhoneNumbers(new long[] { 123456, 987654 });\r\n\t\temp.setRole(\"Manager\");\r\n\r\n\t\tAddress add = new Address();\r\n\t\tadd.setCity(\"Bangalore\");\r\n\t\tadd.setStreet(\"BTM 1st Stage\");\r\n\t\tadd.setZipcode(560100);\r\n\t\temp.setAddress(add);\r\n\r\n\t\tList&lt;String&gt; cities = new ArrayList&lt;String&gt;();\r\n\t\tcities.add(\"Los Angeles\");\r\n\t\tcities.add(\"New York\");\r\n\t\temp.setCities(cities);\r\n\r\n\t\tMap&lt;String, String&gt; props = new HashMap&lt;String, String&gt;();\r\n\t\tprops.put(\"salary\", \"1000 Rs\");\r\n\t\tprops.put(\"age\", \"28 years\");\r\n\t\temp.setProperties(props);\r\n\r\n\t\treturn emp;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u8fd0\u884c\u4ee5\u4e0a\u7a0b\u5e8f\u65f6\uff0c\u60a8\u5c06\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\u3002<\/p>\n<pre class=\"post-pre\"><code>Employee Object\r\n***** Employee Details *****\r\nID=123\r\nName=Pankaj\r\nPermanent=true\r\nRole=Manager\r\nPhone Numbers=[123456, 987654]\r\nAddress=Albany Dr, San Jose, 95129\r\nCities=[Los Angeles, New York]\r\nProperties={age=29 years, salary=1000 USD}\r\n*****************************\r\nEmployee JSON is\r\n\/\/printing same as above json file data\r\n<\/code><\/pre>\n<p>com.fasterxml.jackson.databind.ObjectMapper\u662fJackson API\u4e2d\u6700\u91cd\u8981\u7684\u7c7b\uff0c\u5b83\u63d0\u4f9b\u4e86readValue()\u548cwriteValue()\u65b9\u6cd5\uff0c\u7528\u4e8e\u5c06JSON\u8f6c\u6362\u4e3aJava\u5bf9\u8c61\u548c\u5c06Java\u5bf9\u8c61\u8f6c\u6362\u4e3aJSON\u3002ObjectMapper\u7c7b\u53ef\u4ee5\u88ab\u91cd\u590d\u4f7f\u7528\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u521d\u59cb\u5316\u4e3a\u5355\u4f8b\u5bf9\u8c61\u3002readValue()\u548cwriteValue()\u65b9\u6cd5\u6709\u5f88\u591a\u91cd\u8f7d\u7248\u672c\uff0c\u53ef\u4ee5\u7528\u4e8e\u5904\u7406\u5b57\u8282\u6570\u7ec4\u3001\u6587\u4ef6\u3001\u8f93\u5165\/\u8f93\u51fa\u6d41\u548c\u8bfb\u53d6\u5668\/\u5199\u5165\u5668\u5bf9\u8c61\u3002<\/p>\n<h3>Jackson JSON &#8211; \u5c06 JSON \u8f6c\u6362\u4e3a Map<\/h3>\n<p>\u8fd9\u662f\u6587\u7ae0\u300aJackson JSON Java\u89e3\u6790\u5668API\u793a\u4f8b\u6559\u7a0b\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002<\/p>\n<p>\u5185\u5bb9\u7247\u6bb5: \u6709\u65f6\u5019\u6211\u4eec\u4f1a\u5728data.txt\u6587\u4ef6\u4e2d\u627e\u5230\u5982\u4e0b\u7684JSON\u5bf9\u8c61\uff1a<\/p>\n<pre class=\"post-pre\"><code>{\r\n  \"name\": \"David\",\r\n  \"role\": \"Manager\",\r\n  \"city\": \"Los Angeles\"\r\n}\r\n<\/code><\/pre>\n<p>\u800c\u6211\u4eec\u5e0c\u671b\u5c06\u5176\u8f6c\u6362\u4e3aMap\uff08\u6620\u5c04\uff09\uff0c\u800c\u4e0d\u662f\u5177\u6709\u76f8\u540c\u5c5e\u6027\u548c\u952e\u7684Java\u5bf9\u8c61\u3002\u6211\u4eec\u53ef\u4ee5\u5728Jackson JSON API\u4e2d\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u8f7b\u677e\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff0c\u53ea\u9700\u4e24\u4e2a\u65b9\u6cd5\uff1a<\/p>\n<pre class=\"post-pre\"><code>\/\/\u5c06json\u8f6c\u6362\u4e3aMap\r\nbyte[] mapData = Files.readAllBytes(Paths.get(\"data.txt\"));\r\nMap&lt;String,String&gt; myMap = new HashMap&lt;String, String&gt;();\r\n\r\nObjectMapper objectMapper = new ObjectMapper();\r\nmyMap = objectMapper.readValue(mapData, HashMap.class);\r\nSystem.out.println(\"Map\u5185\u5bb9\u4e3a: \"+myMap);\r\n\r\n\/\/\u53e6\u4e00\u79cd\u65b9\u5f0f\r\nmyMap = objectMapper.readValue(mapData, new TypeReference&lt;HashMap&lt;String,String&gt;&gt;() {});\r\nSystem.out.println(\"\u4f7f\u7528TypeReference\u7684Map: \"+myMap);\r\n<\/code><\/pre>\n<p>\u6267\u884c\u4ee5\u4e0a\u4ee3\u7801\u7247\u6bb5\u540e\uff0c\u6211\u4eec\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\u3002<\/p>\n<pre class=\"post-pre\"><code>Map\u5185\u5bb9\u4e3a: {name=David, role=Manager, city=Los Angeles}\r\n\u4f7f\u7528TypeReference\u7684Map: {name=David, role=Manager, city=Los Angeles}\r\n<\/code><\/pre>\n<h3>\u8bfb\u53d6\u7279\u5b9a\u7684JSON\u952e-Jackson JSON<\/h3>\n<p>\u6709\u65f6\u5019\u6211\u4eec\u4f1a\u6709JSON\u6570\u636e\uff0c\u6211\u4eec\u53ea\u5bf9\u5176\u4e2d\u7684\u51e0\u4e2a\u952e\u503c\u611f\u5174\u8da3\uff0c\u6240\u4ee5\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u5c06\u6574\u4e2aJSON\u8f6c\u6362\u4e3a\u5bf9\u8c61\u5e76\u4e0d\u662f\u4e00\u4e2a\u597d\u4e3b\u610f\u3002Jackson JSON API\u63d0\u4f9b\u4e86\u5c06JSON\u6570\u636e\u4f5c\u4e3a\u6811\u72b6DOM\u89e3\u6790\u5668\u8fdb\u884c\u8bfb\u53d6\u7684\u9009\u9879\uff0c\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\u6211\u4eec\u53ef\u4ee5\u8bfb\u53d6JSON\u5bf9\u8c61\u7684\u7279\u5b9a\u5143\u7d20\u3002\u4e0b\u9762\u7684\u4ee3\u7801\u7247\u6bb5\u63d0\u4f9b\u4e86\u4eceJSON\u6587\u4ef6\u4e2d\u8bfb\u53d6\u7279\u5b9a\u6761\u76ee\u7684\u793a\u4f8b\u3002<\/p>\n<pre class=\"post-pre\"><code>\/\/\u8bfb\u53d6json\u6587\u4ef6\u6570\u636e\u5230\u5b57\u7b26\u4e32\r\nbyte[] jsonData = Files.readAllBytes(Paths.get(\"employee.txt\"));\r\n\r\n\/\/\u521b\u5efaObjectMapper\u5b9e\u4f8b\r\nObjectMapper objectMapper = new ObjectMapper();\r\n\r\n\/\/\u50cfDOM\u89e3\u6790\u5668\u4e00\u6837\u8bfb\u53d6JSON\r\nJsonNode rootNode = objectMapper.readTree(jsonData);\r\nJsonNode idNode = rootNode.path(\"id\");\r\nSystem.out.println(\"id = \"+idNode.asInt());\r\n\r\nJsonNode phoneNosNode = rootNode.path(\"phoneNumbers\");\r\nIterator&lt;JsonNode&gt; elements = phoneNosNode.elements();\r\nwhile(elements.hasNext()){\r\n\tJsonNode phone = elements.next();\r\n\tSystem.out.println(\"\u7535\u8bdd\u53f7\u7801 = \"+phone.asLong());\r\n}\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u6267\u884c\u4ee5\u4e0a\u4ee3\u7801\u7247\u6bb5\u65f6\uff0c\u6211\u4eec\u4f1a\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\u3002<\/p>\n<pre class=\"post-pre\"><code>id = 123\r\n\u7535\u8bdd\u53f7\u7801 = 123456\r\n\u7535\u8bdd\u53f7\u7801 = 987654\r\n<\/code><\/pre>\n<h3>Jackson JSON &#8211; \u7f16\u8f91 JSON \u6587\u6863<\/h3>\n<p>Jackson JSON Java API \u63d0\u4f9b\u4e86\u4e00\u4e9b\u6709\u7528\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6dfb\u52a0\u3001\u7f16\u8f91\u548c\u5220\u9664JSON\u6570\u636e\u4e2d\u7684\u952e\uff0c\u7136\u540e\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u4fdd\u5b58\u4e3a\u65b0\u7684JSON\u6587\u4ef6\uff0c\u6216\u8005\u5c06\u5176\u5199\u5165\u4efb\u4f55\u6d41\u4e2d\u3002\u4e0b\u9762\u7684\u4ee3\u7801\u5c55\u793a\u4e86\u5982\u4f55\u8f7b\u677e\u5b9e\u73b0\u6b64\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code>byte[] jsonData = Files.readAllBytes(Paths.get(\"employee.txt\"));\r\n\r\nObjectMapper objectMapper = new ObjectMapper();\r\n\r\n\/\/\u521b\u5efaJsonNode\r\nJsonNode rootNode = objectMapper.readTree(jsonData);\r\n\r\n\/\/\u66f4\u65b0JSON\u6570\u636e\r\n((ObjectNode) rootNode).put(\"id\", 500);\r\n\/\/\u6dfb\u52a0\u65b0\u7684\u952e\u503c\r\n((ObjectNode) rootNode).put(\"test\", \"\u6d4b\u8bd5\u503c\");\r\n\/\/\u79fb\u9664\u5df2\u5b58\u5728\u7684\u952e\r\n((ObjectNode) rootNode).remove(\"role\");\r\n((ObjectNode) rootNode).remove(\"properties\");\r\nobjectMapper.writeValue(new File(\"updated_emp.txt\"), rootNode);\r\n<\/code><\/pre>\n<p>\u5982\u679c\u4f60\u6267\u884c\u4ee5\u4e0a\u7684\u4ee3\u7801\u5e76\u5bfb\u627e\u65b0\u6587\u4ef6\uff0c\u4f60\u4f1a\u6ce8\u610f\u5230\u5b83\u6ca1\u6709&#8221;role&#8221; \u548c &#8220;properties&#8221; \u952e\u3002\u4f60\u8fd8\u4f1a\u6ce8\u610f\u5230&#8221;id&#8221;\u7684\u503c\u88ab\u66f4\u65b0\u4e3a500\uff0c\u540c\u65f6\u5728 updated_emp.txt \u6587\u4ef6\u4e2d\u6dfb\u52a0\u4e86\u4e00\u4e2a\u65b0\u7684\u952e &#8220;test&#8221;\u3002<\/p>\n<h3>\u6770\u514b\u900a JSON \u6d41\u5f0f API \u793a\u4f8b<\/h3>\n<p>\u8fd9\u662f\u6587\u7ae0\u300aJackson JSON Java\u89e3\u6790\u5668API\u793a\u4f8b\u6559\u7a0b\u300b\u7684\u7b2c3\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002<\/p>\n<p>Jackson JSON Java API\u8fd8\u63d0\u4f9b\u6d41\u5f0f\u5904\u7406\u652f\u6301\uff0c\u5bf9\u4e8e\u5904\u7406\u5927\u578bJSON\u6570\u636e\u975e\u5e38\u6709\u5e2e\u52a9\uff0c\u56e0\u4e3a\u5b83\u5c06\u6574\u4e2a\u6587\u4ef6\u8bfb\u53d6\u4e3a\u4ee4\u724c\uff0c\u5e76\u4e14\u4f7f\u7528\u7684\u5185\u5b58\u8f83\u5c11\u3002\u6d41\u5f0fAPI\u7684\u552f\u4e00\u7f3a\u70b9\u662f\u6211\u4eec\u9700\u8981\u5728\u89e3\u6790JSON\u6570\u636e\u65f6\u5904\u7406\u6240\u6709\u7684\u4ee4\u724c\u3002\u5982\u679c\u6211\u4eec\u7684JSON\u6570\u636e\u662f{&#8220;role&#8221;:&#8221;Manager&#8221;}\uff0c\u90a3\u4e48\u6211\u4eec\u5c06\u6309\u987a\u5e8f\u83b7\u53d6\u4ee5\u4e0b\u4ee4\u724c &#8211; {\uff08\u5f00\u59cb\u5bf9\u8c61\uff09\uff0c&#8221;role&#8221;\uff08\u952e\u540d\uff09\uff0c&#8221;Manager&#8221;\uff08\u952e\u503c\uff09\u548c}\uff08\u7ed3\u675f\u5bf9\u8c61\uff09\u3002\u5192\u53f7\uff08:\uff09\u662fJSON\u4e2d\u7684\u5206\u9694\u7b26\uff0c\u56e0\u6b64\u4e0d\u88ab\u89c6\u4e3a\u4ee4\u724c\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.jackson.json;\r\n\r\nimport java.io.File;\r\nimport java.io.IOException;\r\nimport java.util.ArrayList;\r\nimport java.util.HashMap;\r\nimport java.util.List;\r\n\r\nimport com.fasterxml.jackson.core.JsonFactory;\r\nimport com.fasterxml.jackson.core.JsonParseException;\r\nimport com.fasterxml.jackson.core.JsonParser;\r\nimport com.fasterxml.jackson.core.JsonToken;\r\nimport com.Olivia.jackson.model.Address;\r\nimport com.Olivia.jackson.model.Employee;\r\n\r\npublic class JacksonStreamingReadExample {\r\n\r\n\tpublic static void main(String[] args) throws JsonParseException, IOException {\r\n\t\t\r\n\t\t\/\/ \u521b\u5efaJsonParser\u5bf9\u8c61\r\n\t\tJsonParser jsonParser = new JsonFactory().createParser(new File(\"employee.txt\"));\r\n\t\t\r\n\t\t\/\/ \u5faa\u73af\u904d\u5386\u4ee4\u724c\r\n\t\tEmployee emp = new Employee();\r\n\t\tAddress address = new Address();\r\n\t\temp.setAddress(address);\r\n\t\temp.setCities(new ArrayList&lt;String&gt;());\r\n\t\temp.setProperties(new HashMap&lt;String, String&gt;());\r\n\t\tList&lt;Long&gt; phoneNums = new ArrayList&lt;Long&gt;();\r\n\t\tboolean insidePropertiesObj=false;\r\n\t\t\r\n\t\tparseJSON(jsonParser, emp, phoneNums, insidePropertiesObj);\r\n\t\t\r\n\t\tlong[] nums = new long[phoneNums.size()];\r\n\t\tint index = 0;\r\n\t\tfor(Long l :phoneNums){\r\n\t\t\tnums[index++] = l;\r\n\t\t}\r\n\t\temp.setPhoneNumbers(nums);\r\n\t\t\r\n\t\tjsonParser.close();\r\n\t\t\/\/ \u6253\u5370\u5458\u5de5\u5bf9\u8c61\r\n\t\tSystem.out.println(\"Employee Object\\n\\n\"+emp);\r\n\t}\r\n\r\n\tprivate static void parseJSON(JsonParser jsonParser, Employee emp,\r\n\t\t\tList&lt;Long&gt; phoneNums, boolean insidePropertiesObj) throws JsonParseException, IOException {\r\n\t\t\r\n\t\t\/\/ \u5faa\u73af\u904d\u5386JsonTokens\r\n\t\twhile(jsonParser.nextToken() != JsonToken.END_OBJECT){\r\n\t\t\tString name = jsonParser.getCurrentName();\r\n\t\t\tif(\"id\".equals(name)){\r\n\t\t\t\tjsonParser.nextToken();\r\n\t\t\t\temp.setId(jsonParser.getIntValue());\r\n\t\t\t}else if(\"name\".equals(name)){\r\n\t\t\t\tjsonParser.nextToken();\r\n\t\t\t\temp.setName(jsonParser.getText());\r\n\t\t\t}else if(\"permanent\".equals(name)){\r\n\t\t\t\tjsonParser.nextToken();\r\n\t\t\t\temp.setPermanent(jsonParser.getBooleanValue());\r\n\t\t\t}else if(\"address\".equals(name)){\r\n\t\t\t\tjsonParser.nextToken();\r\n\t\t\t\t\/\/ \u5d4c\u5957\u5bf9\u8c61\uff0c\u9012\u5f52\u8c03\u7528\r\n\t\t\t\tparseJSON(jsonParser, emp, phoneNums, insidePropertiesObj);\r\n\t\t\t}else if(\"street\".equals(name)){\r\n\t\t\t\tjsonParser.nextToken();\r\n\t\t\t\temp.getAddress().setStreet(jsonParser.getText());\r\n\t\t\t}else if(\"city\".equals(name)){\r\n\t\t\t\tjsonParser.nextToken();\r\n\t\t\t\temp.getAddress().setCity(jsonParser.getText());\r\n\t\t\t}else if(\"zipcode\".equals(name)){\r\n\t\t\t\tjsonParser.nextToken();\r\n\t\t\t\temp.getAddress().setZipcode(jsonParser.getIntValue());\r\n\t\t\t}else if(\"phoneNumbers\".equals(name)){\r\n\t\t\t\tjsonParser.nextToken();\r\n\t\t\t\twhile (jsonParser.nextToken() != JsonToken.END_ARRAY) {\r\n\t\t\t\t\tphoneNums.add(jsonParser.getLongValue());\r\n\t\t\t\t}\r\n\t\t\t}else if(\"role\".equals(name)){\r\n\t\t\t\tjsonParser.nextToken();\r\n\t\t\t\temp.setRole(jsonParser.getText());\r\n\t\t\t}else if(\"cities\".equals(name)){\r\n\t\t\t\tjsonParser.nextToken();\r\n\t\t\t\twhile (jsonParser.nextToken() != JsonToken.END_ARRAY) {\r\n\t\t\t\t\temp.getCities().add(jsonParser.getText());\r\n\t\t\t\t}\r\n\t\t\t}else if(\"properties\".equals(name)){\r\n\t\t\t\tjsonParser.nextToken();\r\n\t\t\t\twhile(jsonParser.nextToken() != JsonToken.END_OBJECT){\r\n\t\t\t\t\tString key = jsonParser.getCurrentName();\r\n\t\t\t\t\tjsonParser.nextToken();\r\n\t\t\t\t\tString value = jsonParser.getText();\r\n\t\t\t\t\temp.getProperties().put(key, value);\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t}\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>JsonParser\u662f\u4f7f\u7528Jackson JSON\u6d41\u5f0fAPI\u8bfb\u53d6JSON\u6570\u636e\u7684\u5de5\u5177\u3002\u6211\u4eec\u6b63\u5728\u4f7f\u7528\u5b83\u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u7136\u540e\u4f7f\u7528parseJSON()\u65b9\u6cd5\u6765\u904d\u5386\u8fd9\u4e9b\u4ee4\u724c\u5e76\u5904\u7406\u5b83\u4eec\u4ee5\u521b\u5efa\u6211\u4eec\u7684Java\u5bf9\u8c61\u3002\u8bf7\u6ce8\u610f\uff0c\u5bf9\u4e8e&#8221;address&#8221;\uff0cparseJSON()\u65b9\u6cd5\u4f1a\u9012\u5f52\u8c03\u7528\uff0c\u56e0\u4e3a\u5b83\u662fJSON\u6570\u636e\u4e2d\u7684\u4e00\u4e2a\u5d4c\u5957\u5bf9\u8c61\u3002\u5bf9\u4e8e\u89e3\u6790\u6570\u7ec4\uff0c\u6211\u4eec\u4f1a\u904d\u5386JSON\u6587\u6863\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528JsonGenerator\u7c7b\u6765\u751f\u6210\u6d41\u5f0fAPI\u7684JSON\u6570\u636e\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.jackson.json;\r\n\r\nimport java.io.FileOutputStream;\r\nimport java.io.IOException;\r\nimport java.util.Set;\r\n\r\nimport com.fasterxml.jackson.core.JsonFactory;\r\nimport com.fasterxml.jackson.core.JsonGenerator;\r\nimport com.fasterxml.jackson.core.util.DefaultPrettyPrinter;\r\nimport com.Olivia.jackson.model.Employee;\r\n\r\npublic class JacksonStreamingWriteExample {\r\n\r\n\tpublic static void main(String[] args) throws IOException {\r\n\t\tEmployee emp = JacksonObjectMapperExample.createEmployee();\r\n\r\n\t\tJsonGenerator jsonGenerator = new JsonFactory()\r\n\t\t\t\t.createGenerator(new FileOutputStream(\"stream_emp.txt\"));\r\n\t\t\/\/ \u7528\u4e8e\u7f8e\u5316\u6253\u5370\r\n\t\tjsonGenerator.setPrettyPrinter(new DefaultPrettyPrinter());\r\n\t\t\r\n\t\tjsonGenerator.writeStartObject(); \/\/ \u5f00\u59cb\u6839\u5bf9\u8c61\r\n\t\tjsonGenerator.writeNumberField(\"id\", emp.getId());\r\n\t\tjsonGenerator.writeStringField(\"name\", emp.getName());\r\n\t\tjsonGenerator.writeBooleanField(\"permanent\", emp.isPermanent());\r\n\t\t\r\n\t\tjsonGenerator.writeObjectFieldStart(\"address\"); \/\/ \u5f00\u59cb\u5730\u5740\u5bf9\u8c61\r\n\t\t\tjsonGenerator.writeStringField(\"street\", emp.getAddress().getStreet());\r\n\t\t\tjsonGenerator.writeStringField(\"city\", emp.getAddress().getCity());\r\n\t\t\tjsonGenerator.writeNumberField(\"zipcode\", emp.getAddress().getZipcode());\r\n\t\tjsonGenerator.writeEndObject(); \/\/ \u7ed3\u675f\u5730\u5740\u5bf9\u8c61\r\n\t\t\r\n\t\tjsonGenerator.writeArrayFieldStart(\"phoneNumbers\");\r\n\t\t\tfor(long num : emp.getPhoneNumbers())\r\n\t\t\t\tjsonGenerator.writeNumber(num);\r\n\t\tjsonGenerator.writeEndArray();\r\n\t\t\r\n\t\tjsonGenerator.writeStringField(\"role\", emp.getRole());\r\n\t\t\r\n\t\tjsonGenerator.writeArrayFieldStart(\"cities\"); \/\/ \u5f00\u59cb\u57ce\u5e02\u6570\u7ec4\r\n\t\tfor(String city : emp.getCities())\r\n\t\t\tjsonGenerator.writeString(city);\r\n\t\tjsonGenerator.writeEndArray(); \/\/ \u5173\u95ed\u57ce\u5e02\u6570\u7ec4\r\n\t\t\r\n\t\tjsonGenerator.writeObjectFieldStart(\"properties\");\r\n\t\t\tSet&lt;String&gt; keySet = emp.getProperties().keySet();\r\n\t\t\tfor(String key : keySet){\r\n\t\t\t\tString value = emp.getProperties().get(key);\r\n\t\t\t\tjsonGenerator.writeStringField(key, value);\r\n\t\t\t}\r\n\t\tjsonGenerator.writeEndObject(); \/\/ \u5173\u95ed\u5c5e\u6027\u5bf9\u8c61\r\n\t\tjsonGenerator.writeEndObject(); \/\/ \u5173\u95ed\u6839\u5bf9\u8c61\r\n\t\t\r\n\t\tjsonGenerator.flush();\r\n\t\tjsonGenerator.close();\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u76f8\u5bf9\u4e8eJsonParser\uff0cJsonGenerator\u66f4\u5bb9\u6613\u4f7f\u7528\u3002\u8fd9\u5c31\u662f\u5173\u4e8eJackson JSON\u89e3\u6790\u5668Java API\u7684\u5feb\u901f\u53c2\u8003\u6559\u7a0b\u7684\u5168\u90e8\u5185\u5bb9\u3002Jackson JSON Java API\u6613\u4e8e\u4f7f\u7528\uff0c\u5e76\u63d0\u4f9b\u4e86\u8bb8\u591a\u9009\u9879\uff0c\u4ee5\u4fbf\u5f00\u53d1\u4eba\u5458\u8f7b\u677e\u5904\u7406JSON\u6570\u636e\u3002\u4ece\u4e0b\u9762\u7684\u94fe\u63a5\u4e0b\u8f7d\u9879\u76ee\u5e76\u8fdb\u884c\u5c1d\u8bd5\uff0c\u4ee5\u8fdb\u4e00\u6b65\u4e86\u89e3\u5173\u4e8eJackson JSON API\u7684\u66f4\u591a\u9009\u9879\u3002<\/p>\n<p><a href=\"#\">\u4e0b\u8f7dJackson JSON\u9879\u76ee<\/a><\/p>\n<p><strong>\u53c2\u8003\u8d44\u6599<\/strong>\uff1a<a href=\"#\" target=\"_blank\">Jackson\u7684GitHub\u9875\u9762<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aJackson JSON Java\u89e3\u6790\u5668API\u793a\u4f8b\u6559\u7a0b\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002 Jackson J [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1317,189,1480,677,1059],"class_list":["post-487","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-jackson","tag-java","tag-java-api","tag-json"],"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 Jackson JSON\u5b8c\u5168\u6307\u5357\uff1aAPI\u4f7f\u7528\u6559\u7a0b\u4e0e\u5b9e\u4f8b\u89e3\u6790 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u672c\u6559\u7a0b\u8be6\u7ec6\u4ecb\u7ecdJava\u4e2dJackson 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