Android
Fastjson

Introducción

Sintaxis

• Objeto parse (texto de cadena)
• JSONObject parseObject (texto de cadena)
• T parseObject (String text, Class <T> clazz)
• JSONArray parseArray (texto de cadena)
• <T> List <T> parseArray (texto de cadena, clase <T> garabato)
• String toJSONString (objeto objeto)
• String toJSONString (objeto Object, boolean prettyFormat)
• Object toJSON (Object javaObject)

Analizando JSON con Fastjson

Puedes ver el ejemplo en la biblioteca de Fastjson.

Codificar

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);

Salida

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

Descodificar

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

Grupo.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);
    }
}

Usuario.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;
    }
}

Convertir los datos de tipo Map to JSON String

Código

    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);  

Salida

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