Jetty实战(5)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/*。

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();  
    }  
}