后端怎么解析json数据

使用以上两种方式解析json均需要依赖json-lib.jar开发包使用依赖包
1、JsonObject
使用JsonObject解析只有一条数据的json是非常方便的例如："{"name":"zhangsan","password":"zhangsan123","email":"10371443@qq.com"}"
[java] view plain copy
public static void main(String[] args) {

     String jsonString ="{\"name\":\"zhangsan\",\"password\":\"zhangsan123\",\"email\":\"10371443@qq.com\"}";  
     JSONObject json = JSONObject.fromObject(jsonString);  
     User user = new User();  
     user.setName(json.getString("name"));  
     user.setPassword(json.getString("password"));  
     user.setEmail(json.getString("email"));  
     System.out.println(user.toString());  
}  

2、JsonArray
使用JsonArray解析数组数据的json是非常方便的例如："[{"name":"zhangsan","password":"zhangsan123","email":"10371443@qq.com"},{"name":"lisi","password":"lisi123","email":"1435123@qq.com"}]"
[java] view plain copy
String json = "[{"name":"zhangsan","password":"zhangsan123","email":"10371443@qq.com"},{"name":"lisi","password":"lisi123","email":"1435123@qq.com"}]";

     JSONArray jsonArray = JSONArray.fromObject(json);  
     ArrayList<User> users = new ArrayList<User>();  
     for (int i = 0; i < jsonArray.size(); i++) {  
         User userM = new User();  
         user.setName(jsonArray.getJSONObject(i).getString("name"));  
         user.setpassword(jsonArray.getJSONObject(i).getString("password"));  
         user.setEmail(jsonArray.getJSONObject(i).getString("email"));  
         users.add(user);  
    }  
     for (User user : users) {  
        System.out.println(user.toString());  
    }  

通过以上两种方式可以解析不同格式的json数据
ps：来源网络