利用fastjson将对象、数组、List及Map转换成json字符串

package com.ant.jdk8.json;

import com.alibaba.fastjson.annotation.JSONField;

import java.util.Date;

public class User {

    private String name;
    private int age;
    @JSONField(format="yyyy-MM-dd HH:mm:ss")
    private Date hireDate;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Date getHireDate() {
        return hireDate;
    }

    public void setHireDate(Date hireDate) {
        this.hireDate = hireDate;
    }

    public User(String name, int age, Date hireDate) {
        this.name = name;
        this.age = age;
        this.hireDate = hireDate;
    }

    public User() {
    }
}

package com.ant.jdk8.json;

import com.alibaba.fastjson.JSON;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class JsonDemo {

    public static void main(String[] args) {
        convertObjToJson();
        //convertArrayToJson();
        //convertCollectionToJson();
    }

    //将Java对象转换成json字符串
    public static void convertObjToJson(){
        User user = new User("tom",20,new Date());
        String jsonString = JSON.toJSONString(user);
        System.out.println(jsonString);
    }

    //将数组转换成json字符串
    public static void convertArrayToJson(){
        User user1 = new User("tom",20,new Date());
        User user2 = new User("jack",25,new Date());
        User[] userArray = {user1,user2};
        String jsonString = JSON.toJSONString(userArray);
        System.out.println(jsonString);
    }

    //将集合转换成json字符串
    public static void convertCollectionToJson(){
        List<User> userList = new ArrayList<>();
        userList.add(new User("tom",20,new Date()));
        userList.add(new User("jack",25,new Date()));
        String jsonString = JSON.toJSONString(userList);
        System.out.println(jsonString);
    }

}

package com.ant.jdk8.json;

import java.util.HashMap;
import java.util.Map;

public class User {

    private String name;

    private Map<String,Integer> score = new HashMap<>();

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Map<String, Integer> getScore() {
        return score;
    }

    public void setScore(Map<String, Integer> score) {
        this.score = score;
    }

    public User(String name, Map<String, Integer> score) {
        this.name = name;
        this.score = score;
    }

    public User() {
    }
}

package com.ant.jdk8.json;

import com.alibaba.fastjson.JSON;

import java.util.HashMap;
import java.util.Map;

public class JsonDemo {

    public static void main(String[] args) {
        convertMapToJson();
    }

    public static void convertMapToJson(){
        Map<String,Integer> score = new HashMap<>();
        score.put("语文",80);
        score.put("数学",90);
        User user = new User("tom",score);
        String jsonString = JSON.toJSONString(user,true);
        System.out.println(jsonString);
    }

}