/**
     * 了解:
     * 
     * @CookieValue: 映射一個 Cookie 值. 屬性同 @RequestParam
     */
    @RequestMapping("/testCookieValue")
    public String testCookieValue(@CookieValue("JSESSIONID") String sessionId) {
        System.out.println("testCookieValue: sessionId: " + sessionId);
        return SUCCESS;
    }

    
 
/**
     * 了解: 映射請求頭信息 用法同 @RequestParam
     */
    @RequestMapping("/testRequestHeader")
    public String testRequestHeader(
            @RequestHeader(value = "Accept-Language") String al) {
        System.out.println("testRequestHeader, Accept-Language: " + al);
        return SUCCESS;
    }

    
 
/**
     * @RequestParam 來映射請求參數. value 值即請求參數的參數名 required 該參數是否必須. 默認為 true
     *               defaultValue 請求參數的默認值
     */
    @RequestMapping(value = "/testRequestParam")
    public String testRequestParam(
            @RequestParam(value = "username") String un,
            @RequestParam(value 
 
= "age", required = false, defaultValue = "0") int age) {
        System.out.println("testRequestParam, username: " + un + ", age: "
                + age);
        return SUCCESS;
    }

springmvc RequestParam、RequestHeader