jsp实现下载文件

js调用jsp页面

window.open("/bfdf/web/DF07?fileName=" + eiInfo.get("fileName"), "_self");

 

jsp代码

<%@page import="java.net.URLDecoder"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="java.io.*" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>







<%
	response.setCharacterEncoding("gb2312");
	request.setCharacterEncoding("gb2312");
	if (request.getParameter("fileName") != null) {
		OutputStream outStream = null;
		FileInputStream fileInputStream = null;
		try {
			String file = URLDecoder.decode(request.getParameter("fileName"), "UTF-8");
			String fileName = file.substring(file.lastIndexOf(File.separator) + 1);

			if (!(new File(file)).exists()) {
				System.out.println("没有文件");
				return;
			}
			System.out.println("文件名为："+file);
			outStream = response.getOutputStream();
			response.setHeader("content-disposition", "attachment;filename=" + fileName);
			//此项内容随文件类型而异
			response.setContentType("application/vnd.ms-excel");
			
			byte temp[] = new byte[1000];
			fileInputStream = new FileInputStream(file);
			
			int n = 0;
			while ((n = fileInputStream.read(temp)) != -1) {
				outStream.write(temp, 0, n);
			}
		} catch (Exception e) {
			out.print("出错");
		} finally {
			if (outStream != null){
				outStream.close();
			}
			if (fileInputStream != null){
				fileInputStream.close();
			}
		}
		out.clear();
		out = pageContext.pushBody();
	}
%>

java部分

return file.getAbsolutePath();