一文盘点Spring MVC中用于处理HTTP请求的常用注解

@RestController
public class UserController {
// 路由器规则注册
@RequestMapping("/hello")
	public String hello(){
		return "hello,Spring boot";
	}
}

@RestController
public class UserController {
// 路由器规则注册
@RequestMapping(value = "/hello",method= RequestMethod.POST)
	public String hello(){
		return "hello,Spring boot";
	}
}

@RestController
public class TestController {

    @RequestMapping("/hello")
    public String hello() {
        return "Hello World";
    }

    @RequestMapping("/user")
    public User getUser() {
        User user = new User("张三", 25);
        return user;  // 返回一个 Java 对象
    }
}

@RestController
public class UserController {
    @RequestMapping("/user")
    public String getUser(@RequestParam("id") int userId) {
        return "用户ID是：" + userId;
    }
}

@RequestParam(value = "name", required = false) String userName

@RequestMapping("/test")
public String method6(@RequestParam List<String> listParam){
	return "size:"+listParam.size() + ",listParam:"+listParam;
}

{
    "name": "张三",
    "age": 25
}

@PostMapping("/user")
public String createUser(@RequestBody User user) {
    System.out.println(user.getName()); // 输出 "张三"
    return "success";
}

@RequestMapping("/m8/{id}/{name}")
public String method8(@PathVariable Integer id, @PathVariable("name") String 
userName){
	return "解析参数id:"+id+",name:"+userName;
}

@RestController
public class UserController {
    @GetMapping("/users/{id}")
    public String getUser(@PathVariable("id") int userId) {
        return "用户ID：" + userId;
    }
}

@RequestMapping("/m9")
public String getfile(@RequestPart("file") MultipartFile file) throws IOException {
	//获取⽂件名称
	String fileName = file.getOriginalFilename();
	//⽂件上传到指定路径
	file.transferTo(new File("D:/temp/" + file.getOriginalFilename()));
	return "接收到⽂件名称为: "+fileName;
}

@RequestMapping("/getCookie")
public String cookie(@CookieValue("bite") String bite) {
	return "bite：" + bite;
}

@RequestMapping("/getSess2")
public String sess2(@SessionAttribute(value = "username",required = false)
User username) {
	return "username："+user.getUsername();
}

@RequestMapping("/getSess2")
public String sess2(@SessionAttribute(value = "username",required = false)
String username) {
	return "username："+ username;
}