json响应流程

请求-->DispatchServlet

-->HandlerMapping

-->Controller

-->返回数据对象(String/user/list/Map)

-->json响应

怎么用？

-导包 jackson

-配置注解驱动；

-Controller方法上增加@ResponseBody

 

JsonController.java

package cn.tedu.controller;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import cn.tedu.entity.User;

@Controller
public class JsonController {
    @RequestMapping("/json1.do")//匹配请求    
    @ResponseBody  //调用jackson
    public User loadUser() {
        User user = new User(1,"Jack","20"); 
        return user;
    }
    
    @RequestMapping("/json2.do")
    @ResponseBody
    public List<User> loadUsers(){
        List<User> list = new ArrayList<User>();
        User user1 = new User(1,"苍#null","18");
        User user2 = new User(2,"二蛋","88");
        list.add(user1);
        list.add(user2);
        return list;
    }
    
    @RequestMapping("/json3.do")
    @ResponseBody
    public Map<String, Object> loadDate(){
        Map<String, Object> data = new HashMap<String, Object>();
        data.put("id", 1);
        data.put("name", "狗蛋儿");
        return data;
    }
    
}

User.java

package cn.tedu.entity;

import java.io.Serializable;

public class User implements Serializable{
    private int id;
    private String name;
    private String age;
    public User(int id, String name, String age) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
    }
    public User() {
        super();
    }
    
    
    
}