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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 + '\'' + '}'; } }
1、Json-Lib
maven依赖如下,需注意
net.sf.json-lib json-lib 2.4 jdk15
测试demo
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); } }
2、org.json
maven依赖如下
org.json json 20170516
测试demo
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); } }
3、Jackson
maven依赖
com.fasterxml.jackson.core jackson-databind 2.9.0
测试demo
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(); } } }
4、Gson
maven依赖
com.google.code.gson gson 2.8.1
测试demo
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); } }
5、FastJson
maven依赖
com.alibaba fastjson 1.2.37
测试demo
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); } }
json-lib时间有些久远,jar包只更新到2010年
org.json用起来有些繁琐
Jackson、Gson、FastJson只需一两句话就可以搞定
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