Java实现Json字符串与Object对象相互转换的方式总结

public class user {

   private string name;

   private integer age;

   private string location;

   public user() {

   }

   public user(string name) {

     this .name = name;

   }

   public user(string name, integer age) {

     this .name = name;

     this .age = age;

   }

   public user(string name, integer age, string location) {

     this .name = name;

     this .age = age;

     this .location = location;

   }

   public string getname() {

     return name;

   }

   public void setname(string name) {

     this .name = name;

   }

   public integer getage() {

     return age;

   }

   public void setage(integer age) {

     this .age = age;

   }

   public string getlocation() {

     return location;

   }

   public void setlocation(string location) {

     this .location = location;

   }

   @override

   public string tostring() {

     return "user{" +

         "name='" + name + '\ '' +

         ", age=" + age +

         ", location='" + location + '\ '' +

         '}' ;

   }

}

<dependency>

  <groupid>net.sf.json-lib</groupid>

  <artifactid>json-lib</artifactid>

  <version> 2.4 </version>

  <classifier>jdk15</classifier>

</dependency>

import net.sf.json.jsonobject;

public class jsonlibdemo {

   public static void main(string[] args) {

     //创建测试object

     user user = new user( "李宁" , 24 , "北京" );

     system.out.println(user);

     //转成json字符串

     jsonobject jsonobject = jsonobject.fromobject(user);

     string json = jsonobject.tostring();

     system.out.println(json);

     //json字符串转成对象

     jsonobject jsonobject1 = jsonobject.fromobject(json);

     user user1 = (user) jsonobject.tobean(jsonobject1,user. class );

     system.out.println(user1);

   }

}

<dependency>

  <groupid>org.json</groupid>

  <artifactid>json</artifactid>

  <version> 20170516 </version>

</dependency>

import org.json.jsonobject;

public class orgjsondemo {

   public static void main(string[] args) {

     //创建测试object

     user user = new user( "李宁" , 24 , "北京" );

     system.out.println(user);

     //转成json字符串

     string json = new jsonobject(user).tostring();

     system.out.println(json);

     //json字符串转成对象

     jsonobject jsonobject = new jsonobject(json);

     string name = jsonobject.getstring( "name" );

     integer age = jsonobject.getint( "age" );

     string location = jsonobject.getstring( "location" );

     user user1 = new user(name,age,location);

     system.out.println(user1);

   }

}

<dependency>

  <groupid>com.fasterxml.jackson.core</groupid>

  <artifactid>jackson-databind</artifactid>

  <version> 2.9 . 0 </version>

</dependency>

import com.fasterxml.jackson.databind.objectmapper;

public class jacksondemo {

   public static void main(string[] args) {

     //创建测试object

     user user = new user( "李宁" , 24 , "北京" );

     system.out.println(user);

     //转成json字符串

     objectmapper mapper = new objectmapper();

     try {

       string json = mapper.writevalueasstring(user);

       system.out.println(json);

       //json字符串转成对象

       user user1 = mapper.readvalue(json,user. class );

       system.out.println(user1);

     } catch (java.io.ioexception e) {

       e.printstacktrace();

     }

   }

}

<dependency>

  <groupid>com.google.code.gson</groupid>

  <artifactid>gson</artifactid>

  <version> 2.8 . 1 </version>

</dependency>

import com.google.gson.gson;

public class gsondemo {

   public static void main(string[] args) {

     //创建测试object

     user user = new user( "李宁" , 24 , "北京" );

     system.out.println(user);

     //转成json字符串

     gson gson = new gson();

     string json = gson.tojson(user);

     system.out.println(json);

     //json字符串转成对象

     user user1 = gson.fromjson(json,user. class );

     system.out.println(user1);

   }

}

<dependency>

  <groupid>com.alibaba</groupid>

  <artifactid>fastjson</artifactid>

  <version> 1.2 . 37 </version>

</dependency>

import com.alibaba.fastjson.json;

public class fastjsondemo {

   public static void main(string[] args) {

     //创建测试object

     user user = new user( "李宁" , 24 , "北京" );

     system.out.println(user);

     //转成json字符串

     string json = json.tojson(user).tostring();

     system.out.println(json);

     //json字符串转成对象

     user user1 = json.parseobject(json,user. class );

     system.out.println(user1);

   }

}