使用Servlet实现下载文件的功能

在前台有一个下载链接，比如

<a href="DownLoadServlet">下载</a> <br/>

使用Servlet实现下载：

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DownLoadServlet extends HttpServlet {

public DownLoadServlet() {
super();
}

public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//处理请求
//读取要下载的文件
File f = new File("E:/好久不见.mp3");
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();
}

}

/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}

}

配置文件注意路径。。。

本文来源于 ：http://www.cnblogs.com/android-html5/archive/2012/03/16/2534082.html