Jetty非常适合做嵌入式web开发，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：

首先pom.xml配置文件如下

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>com.luangeng</groupId>

  <artifactId>jettydownload</artifactId>

  <version>1.0-SNAPSHOT</version>

  <packaging>jar</packaging>

  <name>jettydownload</name>

  <url>http://maven.apache.org</url>

  <properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <jetty.version>8.1.9.v20130131</jetty.version>

  </properties>

  <dependencies>

    <!-- jetty -->

    <dependency>

      <groupId>org.eclipse.jetty.aggregate</groupId>

      <artifactId>jetty-webapp</artifactId>

      <version>${jetty.version}</version>

    </dependency>

    <dependency>

      <groupId>org.eclipse.jetty</groupId>

      <artifactId>jetty-jsp</artifactId>

      <version>${jetty.version}</version>

    </dependency>

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>3.8.1</version>

      <scope>test</scope>

    </dependency>

  </dependencies>

</project>

---

main方法启动Jetty：

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 = new Server();

        server.setStopAtShutdown(true);

        SelectChannelConnector connector = new SelectChannelConnector();

        connector.setPort(8080);

        connector.setReuseAddress(true);

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

        ServletContextHandler context = new ServletContextHandler();

        context.setContextPath("/lg");

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

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

        HandlerCollection handlers = new HandlerCollection();

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

        server.setHandler(handlers);

        server.start();

        server.join();

    }

}

---

提供简单的测试 TestServlet.java

package com.luangeng;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.io.PrintWriter;

/**

 * Created by LG.

 */

public class TestServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

            response.setContentType("text/html");

            PrintWriter out = response.getWriter();

            out.println("<HTML>");

            out.println("<HEAD><TITLE>test</TITLE></HEAD>");

            out.println("<BODY>");

            out.println("GET method");

            out.println("</BODY>");

            out.println("</HTML>");

            out.flush();

            out.close();

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        response.setContentType("text/html");

        PrintWriter out = response.getWriter();

        out.println("<HTML>");

        out.println("<HEAD><TITLE>test</TITLE></HEAD>");

        out.println("<BODY>");

        out.println("POST method");

        out.println("</BODY>");

        out.println("</HTML>");

        out.flush();

        out.close();

    }

}

---

完成下载功能的Servlet：

DownloadServlet.java

package com.luangeng;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.*;

import java.net.URLEncoder;

/**

 * Created by LG.

 */

public class DownLoadServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response) {

        //PrintWriter pw = null;

        FileInputStream in = null;

        OutputStream outs = null;

        //String path = request.getParameter("filepath");

        String path = "/Users/LG/test.txt";

        //path = new String(fileName.getBytes("iso8859-1"),"UTF-8");

        try {

            File file = new File(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 = path.substring(path.indexOf("/")+1);

            response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(realname, "UTF-8"));

            in = new FileInputStream(path);

            outs = response.getOutputStream();

            byte buffer[] = new byte[1024];

            int len = 0;

            while ((len = 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 != null) {

                    outs.flush();

                    outs.close();

                }

                if(in != null) {

                    in.close();

                }

            } catch (IOException e) {

            }

//            if(pw!=null) {

//                pw.flush();

//                pw.close();

//            }

        }

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        doGet(request, response);

    }

}

---

浏览器访问网址 http://localhost:8080/lg/download 即可看到下载

end

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