1、下载链接jsp界面（a链接直接链文件可以看出文件在服务器中的路径，用servlet处理的链接则看不出）
<%@ 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>Insert title here</title> </head> <body> <a href="日期My97DatePickerBeta.rar">下载</a> <br/> <a href="DownloadServlet?file=1.jpg">下载1</a> <br/> <a href="DownloadServlet?file=2.jpg">下载2</a> </body> </html>
备注：a链接直接链文件 遇到文件名为中文时会出现404错误，因为中文乱码了，所以找不到文件，解决方案：
在tomcat中指定url编码即可，找到tomcat目录中的conf下的server.xml，然后打开，找到端口的配置的标签位置：
<Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443" URIEncoding="UTF-8"/>
然后加上URIEncoding="UTF-8"这个配置，重新启动tomcat即可（上面代码我已加上）
摘：http://ykyfendou.iteye.com/blog/2094734
2、DownloadServlet处理代码
package com.java.servlet; import java.io.File; import java.net.URLEncoder; import java.io.*; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet("/DownloadServlet") public class DownloadServlet extends HttpServlet { private static final long serialVersionUID = 1L; public DownloadServlet() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //处理请求 //读取要下载的文件 String fileName = request.getParameter("file"); //获取项目的物理(磁盘)路径 String path = request.getSession().getServletContext().getRealPath("upload"); //构造完整的文件路径及文件名 String filea = path + "/" + fileName; System.out.println(filea); File f = new File(filea); if(f.exists()){ FileInputStream fis = new FileInputStream(f); String filename=URLEncoder.encode(f.getName(),"utf-8"); //解决中文文件名下载后乱码的问题 byte[] b = new byte[fis.available()]; fis.read(b); response.setCharacterEncoding("utf-8"); response.setHeader("Content-Disposition","attachment; filename="+filename+""); //获取响应报文输出流对象 ServletOutputStream out =response.getOutputStream(); //输出 out.write(b); out.flush(); out.close(); } } }