Spring MVC common annotations for java learning

0x00 Preface

Continue with the previous article to record some annotations commonly used by spring MVC.

0x01 common notes

Requestparam annotation

@Controller
public class HelloContraoller {
    @RequestMapping(path = "/hello",params = {"username"})
    public String sayHello(@RequestParam(name="name") String username){
        System.out.println("username"+username);

        return "success";

Use requestparam to assign the parameter with the specified name in the request to the formal parameter in the controller.

Requestbody annotation

@RequestMapping(path = "/tijiao")
public String submit(@RequestBody String body){
    System.out.println(body);

    return "success";
}

Used to get the content of the request body of the post request

Pathvariable annotation

    @RequestMapping(path = "/tijiao/{id}")
    public String submit(@PathVariable (name = "username") String username ){
        System.out.println(username);

        return "success";
    }

Has a placeholder in the binding URL. For example, / delete / {ID} is a placeholder in the URL.

CookieValue

    @RequestMapping(path = "/tijiao")
    public String submit(@CookieValue(value = "JSESSIONID") String cookie){
        System.out.println(cookie);

        return "success";
    }

Value used to get the name of the specified cookie

Sessionattributes annotation

Set value:

@SessionAttributes(value = "msg")
//该注解表示将request域中获取的属性,存入session域中
@Controller
public class HelloContraoller {



    @RequestMapping(path = "/tijiao")
    public String submit(Model model){
//        该方法默认会自动存储到request域里面
        model.addAttribute("msg","abc");


        return "success";
    }


}

Get value:

@RequestMapping(path="/find")
public String find(ModelMap modelMap) {
String username = (String) modelMap.get("username");

return "success";

Delete value:

@RequestMapping(path="/delete")
public String delete(SessionStatus status) {
    status.setComplete();
    return "success";
    }
}

0x02 end

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