jettyjava文件下载代码_Jetty+Servlet实现文件下载

Jetty非常适合做嵌入式web开发&＃xff0c;正如Jetty的口号"Don’t deploy your application in Jetty, deploy Jetty in your application!"。

这个简单的例子是使用Jetty提供文件下载&＃xff1a;

首先pom.xml配置文件如下

4.0.0

com.luangeng

jettydownload

1.0-SNAPSHOT

jar

jettydownload

http://maven.apache.org

UTF-8

8.1.9.v20130131

org.eclipse.jetty.aggregate

jetty-webapp

${jetty.version}

org.eclipse.jetty

jetty-jsp

${jetty.version}

junit

junit

3.8.1

test

View Code

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main方法启动Jetty&＃xff1a;

package com.luangeng;

import org.eclipse.jetty.server.Connector;

import org.eclipse.jetty.server.Handler;

import org.eclipse.jetty.server.Server;

import org.eclipse.jetty.server.handler.DefaultHandler;

import org.eclipse.jetty.server.handler.HandlerCollection;

import org.eclipse.jetty.server.nio.SelectChannelConnector;

import org.eclipse.jetty.servlet.ServletContextHandler;

import org.eclipse.jetty.webapp.WebAppContext;

public class App

{

public static void main( String[] args ) throws Exception {

Server server &＃61; new Server();

server.setStopAtShutdown(true);

SelectChannelConnector connector &＃61; new SelectChannelConnector();

connector.setPort(8080);

connector.setReuseAddress(true);

server.setConnectors(new Connector[] { connector });

ServletContextHandler context &＃61; new ServletContextHandler();

context.setContextPath("/lg");

context.addServlet(DownLoadServlet.class, "/download");

context.addServlet(TestServlet.class, "/test/*");

HandlerCollection handlers &＃61; new HandlerCollection();

handlers.setHandlers(new Handler[] { context, new DefaultHandler() });

server.setHandler(handlers);

server.start();

server.join();

}

}

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提供简单的测试 TestServlet.java

packagecom.luangeng;importjavax.servlet.ServletException;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importjava.io.IOException;importjava.io.PrintWriter;/*** Created by LG.*/

public class TestServlet extendsHttpServlet {public voiddoGet(HttpServletRequest request, HttpServletResponse response)throwsServletException, IOException {

response.setContentType("text/html");

PrintWriter out&＃61;response.getWriter();out.println("");

out.println("

out.println("

out.println("");

out.println("");

out.flush();

out.close();

}public voiddoPost(HttpServletRequest request, HttpServletResponse response)throwsServletException, IOException {

response.setContentType("text/html");

PrintWriter out&＃61;response.getWriter();out.println("");

out.println("

out.println("

out.println("");

out.println("");

out.flush();

out.close();

}

}

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完成下载功能的Servlet&＃xff1a;

DownloadServlet.java

packagecom.luangeng;importjavax.servlet.ServletException;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;import java.io.*;importjava.net.URLEncoder;/*** Created by LG.*/

public class DownLoadServlet extendsHttpServlet {public voiddoGet(HttpServletRequest request, HttpServletResponse response) {//PrintWriter pw &＃61; null;

FileInputStream in &＃61; null;

OutputStream outs&＃61; null;//String path &＃61; request.getParameter("filepath");

String path &＃61; "/Users/LG/test.txt";//path &＃61; new String(fileName.getBytes("iso8859-1"),"UTF-8");

try{

File file&＃61; newFile(path);if(!file.exists())

{

response.setStatus(404);//pw.println("file not found!");//request.getRequestDispatcher("/err.jsp").forward(request, response);

return;

}

response.setContentType("text/html");

String realname&＃61; path.substring(path.indexOf("/")&＃43;1);

response.setHeader("content-disposition", "attachment;filename&＃61;" &＃43; URLEncoder.encode(realname, "UTF-8"));

in&＃61; newFileInputStream(path);

outs&＃61;response.getOutputStream();byte buffer[] &＃61; new byte[1024];int len &＃61; 0;while ((len &＃61; in.read(buffer)) > 0) {

outs.write(buffer,0, len);

}

System.out.println(response.getStatus());

}catch(Exception e)

{//pw.println(e.getMessage());

response.setStatus(300);//log

}finally{

response.setStatus(200);try{if(outs !&＃61; null) {

outs.flush();

outs.close();

}if(in !&＃61; null) {

in.close();

}

}catch(IOException e) {

}//if(pw!&＃61;null) {//pw.flush();//pw.close();//}

}

}public voiddoPost(HttpServletRequest request, HttpServletResponse response)throwsServletException, IOException {

doGet(request, response);

}

}

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end