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Android - Fastjson
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  Parsing JSON with Fastjson

You can look at example in Fastjson library (opens new window)

Encode

import com.alibaba.fastjson.JSON;

Group group = new Group();
group.setId(0L);
group.setName("admin");

User guestUser = new User();
guestUser.setId(2L);
guestUser.setName("guest");

User rootUser = new User();
rootUser.setId(3L);
rootUser.setName("root");

group.addUser(guestUser);
group.addUser(rootUser);

String jsonString = JSON.toJSONString(group);

System.out.println(jsonString);

Output

{"id":0,"name":"admin","users":[{"id":2,"name":"guest"},{"id":3,"name":"root"}]}

Decode

String jsonString = ...;
Group group = JSON.parseObject(jsonString, Group.class);

Group.java

public class Group {

    private Long id;
    private String name;
    private List<User> users = new ArrayList<User>();

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public List<User> getUsers() {
        return users;
    }

    public void setUsers(List<User> users) {
        this.users = users;
    }

    public void addUser(User user) {
        users.add(user);
    }
}

User.java

public class User {

    private Long   id;
    private String name;

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}
  Convert the data of type Map to JSON String

Code


   Group group = new Group();  
    group.setId(1);  
    group.setName("Ke");  
      
    User user1 = new User();  
    user1.setId(2);  
    user1.setName("Liu");  

    User user2 = new User();  
    user2.setId(3);  
    user2.setName("Yue");  
    group.getList().add(user1);  
    group.getList().add(user2);  
      
    Map<Integer, Object> map = new HashMap<Integer,Object>();  
    map.put(1, "No.1");  
    map.put(2, "No.2");  
    map.put(3, group.getList());  
      
    String jsonString = JSON.toJSONString(map);  
    System.out.println(jsonString);

Output

{1:"No.1",2:"No.2",3:[{"id":2,"name":"Liu"},{"id":3,"name":"Yue"}]}

Syntax

  • Object parse(String text)
  • JSONObject parseObject(String text)
  • T parseObject(String text, Class clazz)
  • JSONArray parseArray(String text)
  • List parseArray(String text, Class clazz)
  • String toJSONString(Object object)
  • String toJSONString(Object object, boolean prettyFormat)
  • Object toJSON(Object javaObject)
 

Read Article
https://develop.horje.com/learn/1434/reference

 

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