JSON字符串和实体类的相互转化

首先导入fastjson依赖

    <!-- fastjson --><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.47</version></dependency>

1.json字符串转化为java实体类 (parseObject)

ApprovalVo approvalVo = JSON.parseObject(str, ApprovalVo.class);
// str == json字符串
// ApprovalVo == 实体类

2.json字符串转化为list对象 (parseArray)

String str2 = "[{'password':'123123','username':'zhangsan'},{'password':'321321','username':'lisi'}]";
List<User> users = JSON.parseArray(jsonStr2, User.class);

3.json字符串转化为复杂java对象 （parseObject）

//  复杂对象->>>>对象中嵌套对象的
String str3 = "{'name':'userGroup','users':[{'password':'123123','username':'zhangsan'},{'password':'321321','username':'lisi'}]}";
UserGroup userGroup = JSON.parseObject(jsonStr3, UserGroup.class);

2. 把实体类转化成json字符串

String str = JSON.toJSONString(ApprovalVo);

6. 把json字符串转化成JSONObject

 String jsonStr = "{\"school\":\"商职\",\"sex\":\"男\",\"name\":\"wjw\",\"age\":22}";JSONObject jsonObject = JSONObject.parseObject(jsonStr);System.out.println(jsonObject.getString("name"));System.out.println(jsonObject.getInteger("age"));

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