json fastjson

fastjson是阿里巴巴的开源JSON解析库，它可以解析JSON格式的字符串，支持将Java Bean序列化为JSON字符串，也可以从JSON字符串反序列化到JavaBean。

在pom.xml文件引入以下声明，就可以使用

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.55</version>
        </dependency>

使用举例：

1,解析成字符串

HashMap map = new HashMap();
        ArrayList<String> list = new ArrayList<String>();
        list.add("a");
        list.add("b");
        list.add("c");
        map.put("count", 12);
        map.put("list", list);
        System.out.println(JSON.toJSONString(map));
// {"count":12,"list":["a","b","c"]}

2，对象解析成json字符串

public class User {
    private int id;
    private String phone;
    private String password;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

}

User user = new User();
        user.setId(1);
        user.setPassword("11");
        user.setPhone("11");
        System.out.println(JSON.toJSONString(user));
//        {"id":1,"password":"11","phone":"11"}

3,json字符串解析成对象

String json = "{'id':'1','password':'11','phone':'11'}";
        JSONObject userJson = JSONObject.parseObject(json);
        User user = JSON.toJavaObject(userJson, User.class);
        System.out.println(user);
        System.out.println(user.getId());
//        com.test.domain.User@443b7951
//        1

4,json字符数组转换

String json = "[{'fileName':'aName','path':'ddd'},{'fileName':'bName','path':'ghgh'}]";
        List<Map<String, String>> listObjectFir = (List<Map<String, String>>) JSONArray.parse(json);
        for (Map<String, String> mapList : listObjectFir) {
            String fileName = mapList.get("fileName");
            String path = mapList.get("path");
            System.out.println("fileName:" + fileName + ",path:" + path);
        }
//        fileName:aName,path:ddd
//        fileName:bName,path:ghgh