Jetty实战之 嵌入式Jetty运行Servlet

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/*。

[java] view
plaincopyprint?

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：

[java] view
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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：

[java] view
plaincopyprint?

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();

}

}