SpringMVC的常用注解

springmvc常用注解
1.@controller 注解是否是控制器类
2. @requestMapping 请求路径的注解
在类和方法上都可以用

可以设置请求路径也可以设置请求方法

@RequestMapping("/User")
 
@RequestMapping(value = "/login5",method = RequestMethod.POST)

3.@RequestParam 用在请求参数上
如果传递的参数名和接收的参数名不一致需要@RequestParam 注解

3.1 如果传递的参数名和接收的参数名一致

1	`<a href="User/login2?name=aa&pwd=123">登录2</a><br/>`

@RequestMapping("/login2")
public String login2(String name,String pwd)
{
    System.out.println(name);
 
    System.out.println(pwd);
 
    return "success";
}

3.1 如果传递的参数名和接收的参数名不一致

1	`<a href="User/login4?uname=lisi&upwd=123">登录4</a><br/>`

@RequestMapping("/login4")
public String login4(@RequestParam(value="uname") String name, @RequestParam(value="upwd") String pwd)
   {
       System.out.println(name);
 
       System.out.println(pwd);
 
       return "success";
 
   }

4.@PathVariable
在路径使用rest风格的时候需要用@PathVariable注解路径上的参数

1	`<a href="User/login3/zhangsan/123">登录3</a><br/>`

//rest风格
   @RequestMapping("/login3/{aa}/{pwd}")
   public String login3(@PathVariable(value="aa") String name,@PathVariable(value="pwd") String pwd)
   {
       System.out.println(name);
 
       System.out.println(pwd);
 
       return "success";
   }

5.@RequestHeader
请求头

1	`<a href="User/testHeader2">testHeader2</a><br/>`

@RequestMapping("/testHeader2")
 public String testHeader2(@RequestHeader("host") String header)
 {
       System.out.print(header);
 
       return "success";
 }

6.@CookieValue
获取cookie中的值

<a href="User/setCookie">存cookie</a><br/>
 
<a href="User/getCookie">取cookie</a>

@RequestMapping("/setCookie")
    public String setCookie(HttpServletResponse response)
    {
        Cookie cookie=new Cookie("uname","zhangsan");
 
        cookie.setMaxAge(3600);
 
        cookie.setPath("/");
 
        response.addCookie(cookie);
 
 
        return "success";
    }
 
    @RequestMapping("/getCookie")
    public String getCookie(@CookieValue("uname") String uname)
    {
 
          System.out.println(uname);
 
          return "success";
    }