ServletContext文件下载配置学习笔记

配置web.xml

  <servlet>    <servlet-name>DownServlet01</servlet-name>    <servlet-class>cn.downservlet.DownServlet01</servlet-class>    <init-param>      <param-name>filePath</param-name>       <param-value>d:\简历.pdf</param-value>    </init-param>  </servlet>

java:

import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintWriter;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class DownServlet01 extends HttpServlet {    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        // NO1        ServletConfig config = this.getServletConfig();        String filePath = config.getInitParameter("filePath");        // NO2 头信息        File file = new File(filePath);        response.setHeader("content-disposition",                "attachment;filename=" + file.getName());        // NO3        InputStream is = new FileInputStream(file);        OutputStream os = response.getOutputStream();        byte[] buf = new byte[1024];        int len = 0;        while ((len = is.read(buf)) > 0) {            os.write(buf, 0, len);        }        is.close();        os.close();    }}