springboot(8)RESTful

青旅半醒 2022-06-01 06:22 92阅读 0赞

## 1、申明RESTful控制器 ##

springboot已经集成了序列化反序列化，并默认使用utf-8编码格式，不会出现中文乱码问题。

@RestController为注解@ResponseBody和@Controller的组合
    //声明为rest风格的controller,自动对方法的返回值序列化
    @RestController
    public class TestRestAction { 
        // TODO
    }

## 2、组合注解 ##

**@PostMapping**为组合注解@RequestMapping(method=RequestMethod.POST)  
**@GetMapping**为组合注解@RequestMapping(method=RequestMethod.GET)

## 3、从请求参数中自动获取值 ##

@PostMapping("login")
    public String login(@RequestParam(name="username",required=false)String username,
            @RequestParam(name="password",required=false)String password) {
        // required=false 表示该值可以为null。默认值为true，表示值为null的时候抛出异常
        if(username == null || password == null) {
            return "Error";
        }
        if(username.equals(password)) {
            return "hello world";
        }
        return "Error";
    }

## 4、从URL地址中获取值 ##

@GetMapping("update/{id}")
    public String update(@PathVariable(name="id")Integer id) {
        return "hello :" +id;
    }

## 5、自动序列化反序列化 ##

@PostMapping("postUser")
    public User postUser(User user) {
        System.out.println(user);
        User u = new User();
        u.setId(1);
        u.setUsername("wxtx");
        u.setPasswd("123456");
        return u;
    }

对象结构

public class User { 
        private Integer id;
        private String username;
        private String passwd;
        public Integer getId() {
            return id;
        }
        public void setId(Integer id) {
            this.id = id;
        }
        public String getUsername() {
            return username;
        }
        public void setUsername(String username) {
            this.username = username;
        }
        public String getPasswd() {
            return passwd;
        }
        public void setPasswd(String passwd) {
            this.passwd = passwd;
        }
        @Override
        public String toString() {
            return "User [id=" + id + ", username=" + username + ", passwd=" + passwd + "]";
        }
    
    }

springboot会将请求参数自动组装成对象。请求参数如图：  
![这里写图片描述][20180122203204821]  
返回值：  
\{  
“id”: 1,  
“username”: “wxtx”,  
“passwd”: “123456”  
\}

[20180122203204821]: /images/20220601/b457be9ad1494072876a6291e8fee41b.png