2.RequestParam、RequestHeader、CookieValue注解

在处理方法入参处使用 @RequestParam 可以把请求参数传递给请求方法
value：参数名

required：是否必须。默认为 true, 表示请求参数中必须包含对应的参数，若不存在，将抛出异常

@RequestMapping(value="testRequestParamMethod")
	public String testRequestParamMethod (@RequestParam(value="username") String username,@RequestParam(value="password") String password){
		
		System.out.println("username: "+username+" password: "+password);
		return "success";
	}

	<form action="springmvc/testRequestParamMethod" method="post">
	username:<input type="text" name="username"></br>
	password:<input type="password" name="password"></br>
	<input type="submit" value="submit">
	</form>

@RequestMapping("testRequestHeaderMethod")
	public String testRequestHeaderMethod(@RequestHeader("Accept-Encoding") String AE,@RequestHeader("Accept-Language") String AL){
		System.out.println("Accept-Encoding: "+AE+" Accept-Language: "+AL);
		return "success";
	}

<a href="springmvc/testRequestHeaderMethod">testRequestHeaderMethod</a>

@RequestMapping("testCookieValueMethod")
	public String testCookieValueMethod(@CookieValue("JSESSIONID") String JS){
		System.out.println("JSESSIONID: "+JS);
		return "success";
	}

<a href="springmvc/testCookieValueMethod">testCookieValue</a>

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