使用Java怎么将Json字符串与Object对象进行转换
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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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