spring mvc配置完后实现下载功能

学习笔记，转自：http://blog.csdn.net/huang_hws/article/details/6689213

实现是前台:

<%@ 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">
	<script type="text/javascript" src="js/jquery-1.4.4.min.js"></script>
<title>Insert title here</title>
</head>
<body>
	<input id='fileName' type="text" name="fileName"/>
	<a href="download.do" target="blank"><button>下载</button></a>
</body>
<script type="text/javascript">
	$(function(){
		$('a').click(function(){
			var link=this.href+'?'+'fileName='+$('#fileName').val();
			window.open(link);
			return false;
		});
	});
</script>
</html>

前台填写要下载的文件，后台从文件夹里查找，如果没有文件则返回错误文件，否则则提供任意文件类型的下载（填写文件时必须写后缀）

package hope.cs.zhku.controller;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

/******************************************************************************
 * 名称：UserBasicEditorController.java</br>
 * 日期：2011-8-15</br>
 * 功能：</br>
 * 编写：Willson Huang</br>
 * 复核：</br>
 * 其他：</br>
 * 历史:(说明,修改人,时间)</br>
 * 1.create ,Willson Huang ,2011-8-15
 *****************************************************************************/
@Controller
public class DownloadController {

	@RequestMapping("download.do")
	public void downloadFile(String fileName,HttpServletResponse response){
		response.setCharacterEncoding("utf-8");
		response.setContentType("multipart/form-data");

		response.setHeader("Content-Disposition", "attachment;fileName="+fileName);
		try {
			File file=new File(fileName);
			System.out.println(file.getAbsolutePath());
			InputStream inputStream=new FileInputStream("file/"+file);
			OutputStream os=response.getOutputStream();
			byte[] b=new byte[1024];
			int length;
			while((length=inputStream.read(b))>0){
				os.write(b,0,length);
			}
			inputStream.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

spring mvc配置完后实现下载功能

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