springmvc参数设置默认值，多地址请求

/**
 * @功能描述：
 * 		1.@RequestMapping(value={"add","add2"})
 * 		 表示多地址映射,都可以请求的到
 *		2.@RequestParam(name = "userName", defaultValue = "张三")
 *		 表示如果没有传递userName或没有值,则默认值采用"张三"
 */
@RequestMapping(value={"add","add2"})
@ResponseBody
public String add(@RequestParam(name = "userName", defaultValue = "张三") String userName) {
	System.out.println("userName = "+ userName);
	return userName;
}