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();
}
}
}
