如何在Spring Boot JSON对象中使用@ Produces

Question

是否可以在 Spring Boot 中对 JSON 对象使用 @ Produces ？或者还有另一种方法来实现这一点：

JSONObject J_Session = new JSONObject();
J_Session.put("SESSION_ID_J", session_jid);
J_Session.put("J_APP", "J");
J_Session.put("REST_ID_J", rest_id);

Answer 1

这是一个简单的例子：

RestController类

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

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.websystique.springboot.model.User;

@RestController
@RequestMapping("/api")
public class RestApiController {

    @RequestMapping(value = "/user/", method = RequestMethod.GET, produces = { "application/json" })
    public List<User> listAllUsers() {
        List<User> users = new ArrayList<User>();
        users.add(new User(1, "Sam", 30, 70000));
        users.add(new User(2, "Tom", 40, 50000));
        users.add(new User(3, "Jerome", 45, 30000));
        users.add(new User(4, "Silvia", 50, 40000));
        return users;
    }
}

该属性produces = { "application/json" }自动将 List 集合转换为 json 响应。

下面是 POJO 类。

用户Pojo类

public class User {

    private long id;
    
    private String name;
    
    private int age;
    
    private double salary;

    public User(){
    }
    
    public User(long id, String name, int age, double salary){
        this.id = id;
        this.name = name;
        this.age = age;
        this.salary = salary;
    }
}

JSON 响应示例：

[
   {
      "id":1,
      "name":"Sam",
      "age":30,
      "salary":70000
   },
   {
      "id":2,
      "name":"Tom",
      "age":40,
      "salary":50000
   },
   {
      "id":3,
      "name":"Jerome",
      "age":45,
      "salary":30000
   },
   {
      "id":4,
      "name":"Silvia",
      "age":50,
      "salary":40000
   }
]

请点击此链接获取有关 CRUD 操作的完整详细示例。

上面的代码来自这个链接本身，我只是修改了控制器部分以使其简单。