WebMvc常用注解示例

WebMvc常用注解示例

• 注册模型属性： @ModelAttribute
• 读取请求头： @RequestHeader
• 读取 Cookie： @CookieValue
• 校验参数： @Valid 、@Validated
• 注解处理： @ExceptionHandler
• 切面通知： @ControllerAdvice

示例代码

• HelloWorldController.java

@Controller
public class HelloWorldController {
    @RequestMapping("")
    public String index(@RequestParam(required = true) int value, Model model) {
        return "index";
    }
}

• HelloWorldControllerAdvice.java

@ControllerAdvice(assignableTypes = HelloWorldController.class)
public class HelloWorldControllerAdvice {
    @ModelAttribute("acceptLanguage")
    public String acceptLanguage(@RequestHeader("Accept-Language") String acceptLanguage){
        return acceptLanguage;
    }
    @ModelAttribute("jsessionId")
    public String jsessionId(@CookieValue("JSESSIONID") String jsessionId){
        return jsessionId;
    }
    @ModelAttribute("message")
    public String message(){
        return "Hello,World";
    }
    @ExceptionHandler(Throwable.class)
    public ResponseEntity<String> onException(Throwable throwable) {
        return ResponseEntity.ok(throwable.getMessage());
    }
}