Jetty + Servlet 实现文件下载
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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