Jetty实战之 嵌入式Jetty运行Servlet

原文链接：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/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：

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/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();      }  }