JETTY嵌入式Web容器的开发(一)—基础开发。JETTY嵌入式Web容器的开发(一)—基础开发 JETTY嵌入式Web容器体积小,启动速度快,性能好,免费开源,是一款很适合开发调试和简单演示的轻量级Web容器. 而且它的嵌入式的特点,使得开发者可以直接将容器的操作包含在程序逻辑里,得以摆脱TOMCAT,JBOSS等独立容器带来的安装,维护,部署等一系列令人头疼的问题. JETTY嵌入式开发步骤 下载 本文采用的是2012年最新版本的JETTY8 (8.1.4版) jetty-hightide-8.1.4.v20120524.zip ECLIPSE建立一个普通JAVA项目testjetty 注意: 是JAVA APPLICATION项目,不是WAR项目. JDK要1.6 在项目里建立jetty目录 目录下再建立etc目录 将jetty-hightide-8.1.4.v20120524.zip包中etc目录下的jetty.xml和webdefault.xml文件拷贝入新建的 /jetty/etc目录下 将jetty-hightide-8.1.4.v20120524.zip文件中lib/目录下的所有jar文件和lib/jsp子目录下的所有jar文件都加入项目的buildPath (很多讨论JETTY开发的文章总是在最小JAR包数上做文章,我觉得初学者还是应该将所有JAR包都加入,因为作为一款Web 容器,JETTY的JAR容纳了大量的细节功能. 有的JAR包你没有加入,也许测HELLOWORLD这类功能能够通过,但在真正的商用页面里,就会针对各种HTTP元素出问题) 在项目里建webRoot目录 webRoot目录下建立WEB-INF目录,以后web.xml就放在这里 建成的项目的结构如下: 修改/jetty/etc/jetty.xml 我做了下面两处修改(红字),以利于测试

30 200 false 300000 2 false 8443 20000 5000 JETTY Service类 package org.jetty.demo; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import org.apache.commons.lang.StringUtils; import org.eclipse.jetty.server.Server; import org.eclipse.jetty.server.handler.ContextHandlerCollection; import org.eclipse.jetty.webapp.WebAppContext; import org.eclipse.jetty.xml.XmlConfiguration; import org.xml.sax.SAXException; public class JettyCustomServer extends Server { private String xmlConfigPath; private String contextPath; private String warPath; private String resourceBase = “./webRoot”; private String webXmlPath = “./webRoot/WEB-INF/web.xml”; public JettyCustomServer(String xmlConfigPath,String contextPath,String resourceBase,String webXmlPath) { this(xmlConfigPath,contextPath,resourceBase,webXmlPath,null); } public JettyCustomServer(String xmlConfigPath,String contextPath) { this(xmlConfigPath,contextPath,null,null,null); } public JettyCustomServer(String xmlConfigPath,String contextPath,String warPath) { this(xmlConfigPath,contextPath,null,null,warPath); } public JettyCustomServer(String xmlConfigPath,String contextPath,String resourceBase,String webXmlPath,String warPath) { super(); if(StringUtils.isNotBlank(xmlConfigPath)){ this.xmlConfigPath = xmlConfigPath; readXmlConfig(); } if(StringUtils.isNotBlank(warPath)){ this.warPath = warPath; if(StringUtils.isNotBlank(contextPath)){ this.contextPath = contextPath; applyHandle(true); } }else{ if(StringUtils.isNotBlank(resourceBase)) this.resourceBase = resourceBase; if(StringUtils.isNotBlank(webXmlPath)) this.webXmlPath = webXmlPath; if(StringUtils.isNotBlank(contextPath)){ this.contextPath = contextPath; applyHandle(false); } } } private void readXmlConfig(){ try { XmlConfiguration configuration = new XmlConfiguration(new FileInputStream(this.xmlConfigPath)); configuration.configure(this); } catch (FileNotFoundException e1) { e1.printStackTrace(); } catch (SAXException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } public void applyHandle(Boolean warDeployFlag){ ContextHandlerCollection handler = new ContextHandlerCollection(); WebAppContext webapp = new WebAppContext(); webapp.setContextPath(contextPath); webapp.setDefaultsDescriptor(“./jetty/etc/webdefault.xml”); if(!warDeployFlag){ webapp.setResourceBase(resourceBase); webapp.setDescriptor(webXmlPath); }else{ webapp.setWar(warPath); } handler.addHandler(webapp); super.setHandler(handler); } public void startServer(){ try { super.start(); System.out.println(“current thread:”+super.getThreadPool().getThreads()+”| idle thread:”+super.getThreadPool().getIdleThreads()); super.join(); } catch (Exception e) { e.printStackTrace(); } } public String getXmlConfigPath() { return xmlConfigPath; } public void setXmlConfigPath(String xmlConfigPath) { this.xmlConfigPath = xmlConfigPath; } public String getContextPath() { return contextPath; } public void setContextPath(String contextPath) { this.contextPath = contextPath; } public String getResourceBase() { return resourceBase; } public void setResourceBase(String resourceBase) { this.resourceBase = resourceBase; } public String getWebXmlPath() { return webXmlPath; } public void setWebXmlPath(String webXmlPath) { this.webXmlPath = webXmlPath; } public String getWarPath() { return warPath; } public void setWarPath(String warPath) { this.warPath = warPath; } } 做一个简单的可执行的服务启动类 package org.jetty.demo; public class JettyServerStart { public static void main(String[] args) { JettyCustomServer server = new JettyCustomServer(“./jetty/etc/jetty.xml”,”/testContext”); server.startServer(); } } /webRoot/目录下做一个JSP测试页面 <%@ page language=”java” contentType=”text/html; charset=GBK” pageEncoding=”GBK”%>

hello jetty! 中国!

做一个测试Servlet package org.jetty.demo; 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 HelloWorldServlet extends HttpServlet{ @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println(“doGet”); resp.getWriter().write(“hello world!”); resp.getWriter().close(); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println(“doPost”); super.doPost(req, resp); } } /webRoot/WEB-INF目录下建立一个web.xml

This is the description of my J2EE component This is the display name of my J2EE component HelloWorldServlet org.jetty.demo.HelloWorldServlet HelloWorldServlet /servlet/HelloWorldServlet index.jsp 启动服务 执行JettyServerStart CONSOLE日志: 2012-06-27 15:49:35.250:INFO:oejs.Server:jetty-8.1.4.v20120524 2012-06-27 15:49:35.484:INFO:oejsh.ContextHandler:started o.e.j.w.WebAppContext{/testContext,file:/D:/RND/javaathome/eclipsehelio/testjetty/webRoot/} 2012-06-27 15:49:35.484:INFO:oejsh.ContextHandler:started o.e.j.w.WebAppContext{/testContext,file:/D:/RND/javaathome/eclipsehelio/testjetty/webRoot/} 2012-06-27 15:49:35.703:INFO:oejs.AbstractConnector:Started SelectChannelConnector@0.0.0.0:8088 current thread:30| idle thread:26 看红字部分,记得我们在./jetty/etc/jetty.xml文件中做的修改么? 测试 测试访问JSP页面 http://localhost:8088/testContext/index.jsp 测试访问SERVLET http://localhost:8088/testContext/servlet/HelloWorldServlet