Jetty实战之 嵌入式Jetty运行Servlet

转载链接：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();  
        }  
    }