Jetty实战之 嵌入式Jetty运行Servlet

本文链接：http://blog.csdn.net/kongxx/article/details/7230080

在嵌入式Jetty中，有时候我们想运行一些的Servlet，此时就需要创建创建Context，然后让自己的Servlet运行在这些ServletContext中。

1. 首先创建一个ServletContextServer类，用来初始化web应用程序的Context，并且指定Servlet和Servlet匹配的url。这里指定了两个Servlet，分别是HelloServlet和GoodbyeServlet，并分别对应/hello/*和/goodbye/*。

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package com.google.code.garbagecan.jettystudy.sample5;  

  

import org.eclipse.jetty.server.Server;  

import org.eclipse.jetty.servlet.ServletContextHandler;  

import org.eclipse.jetty.servlet.ServletHolder;  

  

public class ServletContextServer {  

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

        Server server = new Server(8080);  

  

        ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);  

        context.setContextPath("/");  

        server.setHandler(context);  

  

        // http://localhost:8080/hello  

        context.addServlet(new ServletHolder(new HelloServlet()), "/hello");  

        // http://localhost:8080/hello/kongxx  

        context.addServlet(new ServletHolder(new HelloServlet("Hello Kongxx!")), "/hello/kongxx");  

  

        // http://localhost:8080/goodbye  

        context.addServlet(new ServletHolder(new GoodbyeServlet()), "/goodbye");  

        // http://localhost:8080/goodbye/kongxx  

        context.addServlet(new ServletHolder(new GoodbyeServlet("Goodbye kongxx!")), "/goodbye/kongxx");  

          

        server.start();  

        server.join();  

    }  

}  

2. 两个简单的Servlet：HelloServlet和GoodbyeServlet：

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package com.google.code.garbagecan.jettystudy.sample5;  

  

import java.io.IOException;  

import javax.servlet.ServletException;  

import javax.servlet.http.HttpServlet;  

import javax.servlet.http.HttpServletRequest;  

import javax.servlet.http.HttpServletResponse;  

  

public class HelloServlet extends HttpServlet {  

    private static final long serialVersionUID = 1L;  

    private String msg = "Hello World!";  

  

    public HelloServlet() {  

    }  

  

    public HelloServlet(String msg) {  

        this.msg = msg;  

    }  

  

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  

        response.setContentType("text/html");  

        response.setStatus(HttpServletResponse.SC_OK);  

        response.getWriter().println("<h1>" + msg + "</h1>");  

        response.getWriter().println("session=" + request.getSession(true).getId());  

    }  

}  

  

package com.google.code.garbagecan.jettystudy.sample5;  

  

import java.io.IOException;  

import javax.servlet.ServletException;  

import javax.servlet.http.HttpServlet;  

import javax.servlet.http.HttpServletRequest;  

import javax.servlet.http.HttpServletResponse;  

  

public class GoodbyeServlet extends HttpServlet {  

    private static final long serialVersionUID = 1L;  

    private String msg = "Goodbye!";  

  

    public GoodbyeServlet() {  

    }  

  

    public GoodbyeServlet(String msg) {  

        this.msg = msg;  

    }  

  

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  

        response.setContentType("text/html");  

        response.setStatus(HttpServletResponse.SC_OK);  

        response.getWriter().println("<h1>" + msg + "</h1>");  

        response.getWriter().println("session=" + request.getSession(true).getId());  

    }  

}  

3. 运行ServletContextServer类，然后分别访问以下四个url

  http://localhost:8080/hello
  http://localhost:8080/hello/kongxx
  http://localhost:8080/goodbye
  http://localhost:8080/goodbye/kongxx
4. 除了上面的方式外，也可以创建两个个Context，分别绑定到"/hello"和"/goodbye"，如下：

[java] view
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package com.google.code.garbagecan.jettystudy.sample5;  

  

import org.eclipse.jetty.server.Handler;  

import org.eclipse.jetty.server.Server;  

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

import org.eclipse.jetty.servlet.ServletContextHandler;  

import org.eclipse.jetty.servlet.ServletHolder;  

  

public class MultiContextServer {  

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

        Server server = new Server(8080);  

  

        // http://localhost:8080/hello/kongxx  

        ServletContextHandler context1 = new ServletContextHandler(ServletContextHandler.SESSIONS);  

        context1.setContextPath("/hello");  

        context1.setResourceBase(".");  

        context1.setClassLoader(Thread.currentThread().getContextClassLoader());  

        context1.addServlet(new ServletHolder(new HelloServlet("Hello Kongxx!")), "/kongxx");  

  

        // http://localhost:8080/goodbye/kongxx  

        ServletContextHandler context2 = new ServletContextHandler(ServletContextHandler.SESSIONS);  

        context2.setContextPath("/goodbye");  

        context2.setResourceBase(".");  

        context2.setClassLoader(Thread.currentThread().getContextClassLoader());  

        context2.addServlet(new ServletHolder(new GoodbyeServlet("Goodbye kongxx!")), "/kongxx");  

  

        ContextHandlerCollection contexts = new ContextHandlerCollection();  

        contexts.setHandlers(new Handler[] { context1, context2 });  

  

        server.setHandler(contexts);  

  

        server.start();  

        server.join();  

    }  

}