上一节写了一个helloWorld的程序返回，现在来写一个json对象数据的返回。
那我们在helloWorld的基础上做一些改动：
1.User.java
package isenham;
@Component
public class User {
private String userId;
private String userName;
private String userAge;
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserAge() {
return userAge;
}
public void setUserAge(String userAge) {
this.userAge = userAge;
}
}
2.HelloWorld.java修改
package isenham;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloWorld {
@Autowired
private User user;
@RequestMapping("/")
public String sayHelloWorld(){
return "hello world!";
}
@RequestMapping("/jsonUser")
public User jsonUser(){
user.setUserId("001");
user.setUserName("tom");
user.setUserAge("23");
return user;
}
}
3.访问浏览器http://127.0.0.1:8081/jsonUser/可看到{"userId":"001","userName":"tom","userAge":"23"}
（其实Spring Boot也是引用了JSON解析包Jackson，那么自然我们就可以在User对象上使用Jackson提供的json属性的注解）