@RequestParam--SpringMVC 注解系列文章（一)

概述

　　RequestParam 注解是使用 SpringMVC 开发过程中，比较常用的一个注解，用于映射请求参数。

代码

package rex.springmvc.handlers;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

@RequestMapping(value="/requestParamTest")
@Controller
public class RequestParamTest {
	private static final Logger logger = Logger.getLogger(RequestParamTest.class);
	private static final String SUCCESS = "success";

	/**
	 * @RequestParam 注解可以用来映射请求参数
	 * value 值即为请求参数名称
	 * required 表示请求参数是否允许为空，默认值是true
	 * defaultValue 值为请求参数的默认值
	 *
	 * @param userNm
	 * @param age
	 * @return
	 */
	@RequestMapping(value="/testRequestParam", method=RequestMethod.GET)
	public String testRequestParam(@RequestParam(value="userNm") String userNm,
			@RequestParam(value="age", required=false, defaultValue="0") int age){
		logger.debug("userNm:" + userNm);
		logger.debug("age:" + age);
		return SUCCESS;
	}
}

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>ReqeustParam Test</title>
</head>
<body>
    <a href="requestParamTest/testRequestParam?userNm=RexFang&age=18">ReqeustParam Test</a>
</body>
</html>

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