Jetty实战之 嵌入式Jetty运行Servlet

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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(); }}

           

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