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.