JETTY嵌入式Web容器的开发(一)---基础开发

 

qiuJETTY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(粗体),以利于测试

"1.0"?>

 

"Server" class="org.eclipse.jetty.server.Server">

"ThreadPool">

 

"org.eclipse.jetty.util.thread.QueuedThreadPool">

"minThreads">30

"maxThreads">200

"detailedDump">false

 

 

"addConnector">

 

"org.eclipse.jetty.server.nio.SelectChannelConnector">

"host">"jetty.host" />

"port">"jetty.port" default="8088"/>

"maxIdleTime">300000

"Acceptors">2

"statsOn">false

"confidentialPort">8443

"lowResourcesConnections">20000

"lowResourcesMaxIdleTime">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 = newJettyCustomServer("./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"%>

 

 

 

"Content-Type" content="text/html; charset=GBK">

Insert title here

 

 

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

"1.0" encoding="UTF-8"?>

"http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">

 

 

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

 

refurl:http://my.oschina.net/u/989066/blog/157073