Jetty实战之 嵌入式Jetty运行Servlet

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　　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/*。

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/hellocontext.addServlet(new ServletHolder(new HelloServlet()), "/hello");// http://localhost:8080/hello/kongxxcontext.addServlet(new ServletHolder(new HelloServlet("Hello Kongxx!")), "/hello/kongxx");// http://localhost:8080/goodbyecontext.addServlet(new ServletHolder(new GoodbyeServlet()), "/goodbye");// http://localhost:8080/goodbye/kongxxcontext.addServlet(new ServletHolder(new GoodbyeServlet("Goodbye kongxx!")), "/goodbye/kongxx");server.start();server.join();}}2. 两个简单的Servlet：HelloServlet和GoodbyeServlet：
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：
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/kongxxServletContextHandler 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/kongxxServletContextHandler 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();}}