SpringMVC中常用注解与使用方法详解

@Controller
//@RequestMapping("SpringMVC/")
public class HelloController {
 
    //请求方法为get  请求参数必须有username
    @RequestMapping(value = "/hello",method = RequestMethod.GET,params = {"username"})
    //@RequestMapping("/hello")
    public String sayHello(){
        System.out.println("SpringMVC hello~~~");
        return "success";
    }
 
}

@RequestMapping("/testRequestParam")
    //RequestParam --更名  
    // 属性  value=别名 required=必须含有的参数
    public String testRequestParam(@RequestParam(value = "username") String  name){
        System.out.printf(name);
        System.out.println("testRequestParam执行了~~~");
        return "success";
    }

 @RequestMapping("/testRequestBody")
    //RequestBody 获取请求体中的内容  如：username=benshan&password=98989&money=200
    public String testRequestBody(@RequestBody String body){
        System.out.println("testRequestBody执行了~~~");
        System.out.println(body);
        return "success";
    }

@RequestMapping("/testPathVariable/{id}")
    //PathVariable使用Restful风格，结构清晰，拓展方便
    public String testPathVariable(@PathVariable(value = "id") String id){
        System.out.println("testPathVariable~~~");
        System.out.println(id);
        return "success";
    }

 @RequestMapping("/testRequestHeader")
    //testRequestHeader获取请求头的值
    public String testRequestHeader(@RequestHeader(value = "Accept") String header){
        System.out.println("testRequestHeader~~~");
        System.out.println(header);
        return "success";
    }

@RequestMapping("/testCookieValue")
    //testRequestHeader获取请求头的值
    public String testCookieValue(@CookieValue(value = "JSESSIONID") String cookie){
        System.out.println("testCookieValue~~~");
        System.out.println(cookie);
        return "success";
    }

@RequestMapping("/testModelAttribute")
    public String testModelAttribute(){
        System.out.println("testModelAttribute~~~");
        return "success";
    }
    @ModelAttribute
    //在控制器执行之前  执行
    public void showUser(){
        System.out.println("showUser执行了~~~");
    }