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/*。

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();
	}
}