通过Jetty搭建一个简单的Servlet运行环境

最近在做一些简单的Servlet开发的时候,感觉每次调试的时候都要发布到tomcat上很麻烦,把程序共享给同事也很麻烦,需要帮他设置本地的tomcat环境. 在网上找了找其他的Servlet运行环境,发现用Jetty可以很方便的实现嵌入式Web container.这里我记录一下通过Jetty搭建简单Servlet运行环境的过程,希望对有同样需要的朋友有所帮助.

整个环境的代码可以在https://github.com/mcai4gl2/jettysetup找到. 代码包括了IntelliJ的项目文件,如果需要eclipse项目文件,请在下载代码后运行 mvn eclipse:eclipse 来生成eclipse项目文件. (当然, 请在本地安装Maven).

• 设置Maven Dependency:
  

   <dependencies>
           <!-- jetty -->
           <dependency>
               <groupId>org.eclipse.jetty</groupId>
               <artifactId>jetty-server</artifactId>
               <version>${jetty.version}</version>
           </dependency>
           <dependency>
               <groupId>org.eclipse.jetty</groupId>
               <artifactId>jetty-servlet</artifactId>
               <version>${jetty.version}</version>
           </dependency>
           <!-- spring -->
           <dependency>
               <groupId>org.springframework</groupId>
               <artifactId>spring-webmvc</artifactId>
               <version>${spring.version}</version>
           </dependency>
           <!-- log4j -->
           <dependency>
               <groupId>log4j</groupId>
               <artifactId>log4j</artifactId>
               <version>1.2.17</version>
           </dependency>
           <!-- utils -->
           <dependency>
               <groupId>org.apache.commons</groupId>
               <artifactId>commons-io</artifactId>
               <version>1.3.2</version>
           </dependency>
       </dependencies>

  
  
• 设置servlet-context.xml:
  

   <?xml version="1.0" encoding="UTF-8"?>
   <beans:beans xmlns="http://www.springframework.org/schema/mvc"
                xmlns:beans="http://www.springframework.org/schema/beans"
                xmlns:context="http://www.springframework.org/schema/context"
                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                xsi:schemaLocation="
   http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
   http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
  
       <interceptors>
           <interceptor>
               <mapping path="/*"/>
               <beans:bean class="weblog.examples.jettysetup.LoggingInterceptor"/>
           </interceptor>
       </interceptors>
  
       <context:annotation-config/>
  
       <context:component-scan base-package="weblog.examples.jettysetup.serlvet"/>
   </beans:beans>

• 一个简单的Main Class:
  

   public static void main(String[] args) throws Exception {
           try {
               DOMConfigurator.configure(Thread.currentThread().getContextClassLoader().getResource("log4j.xml"));
  
               Server server = new Server();
  
               SelectChannelConnector connector = new SelectChannelConnector();
               connector.setPort(7411);
               server.setConnectors(new Connector[] {connector});
  
               DispatcherServlet servlet = new DispatcherServlet();
               servlet.setContextConfigLocation("classpath:servlet-context.xml");
  
               ServletContextHandler context = new ServletContextHandler();
               context.setContextPath("/");
               context.addServlet(new ServletHolder("baseServlet", servlet), "/");
  
               HandlerCollection handlers = new HandlerCollection();
               handlers.setHandlers(new Handler[] { context, new DefaultHandler()});
               server.setHandler(handlers);
  
               XmlWebApplicationContext wctx = new XmlWebApplicationContext();
               wctx.setConfigLocation("");
               wctx.setServletContext(servlet.getServletContext());
               wctx.refresh();
  
               context.setAttribute(XmlWebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, wctx);
               server.start();
  
               log.info("Jetty embedded server started");
  
               log.info("Press any key to stop");
               System.in.read();
               log.info("Stopping Server");
               server.stop();
               log.info("Server stopped");
  
           } catch (Exception ex) {
               log.error("Failed to run Jetty Server", ex);
               throw ex;
           }
       }

在JettyLauncher运行后,我们可以访问http://localhost:7411/ping来查看Jetty是否成功运行. http://localhost:7411/ping将运行以下Spring MVC Servlet:

 @Controller
 public class TestServlet {

     private static Logger log = Logger.getLogger(TestServlet.class);

     @RequestMapping(value="/ping", method = RequestMethod.GET)
     public void ping(HttpServletResponse response) throws IOException {
         log.info("ping page is called");
         IOUtils.write("Embedded Jetty Server is Up and Running", response.getOutputStream());
     }
 }

通过Jetty,我们可以很容易的在本地运行和调试Servlet,而生成好的Servlet我们可以直接发布到Tomcat. 这样,我们可以简化Servlet的开发和调试.