新手配置 Jetty + Eclipse (Hot code debugging)
在用Tomcat 开发Java Web project 时,在调试的时候,由于我们不断改动java 源文件,因而我们需要不断重新启动Tomcat 更新我们的项目,我们把
很多时间浪费在了更新上,这样开发效率大大降低。
Jetty 完全支持Hot code debugging ,也就是说,我们在更改java源文件,更改html,jsp时不用再重新启动服务器了,这样节省了大量时间(注意
web.xml 等其他配置文件的更新还是需要重新启动服务器的)。
好了现在开始教你如何配置Jetty 到Eclipse.
http://www.eclipse.org/jetty/downloads.php这个地址可以安装eclipse 对jetty支持所需要的东西,可以通过eclipse自动安装
一、安装插件
地址:http://run-jetty-run.googlecode.com/svn/trunk/updatesite
安装方法就不说了。安完后,点击eclipse的run configuration,查看安装成功
二、jetty 配置(可省略直接跳到三)
要想让Jetty启动Web服务器,则要告诉Jetty一些参数,比如端口是多少,哪里才是Web的根目录等。
这个XML配置文件是通用的,对于一般的应用,要修改的个性部分很少,所以保存一份,然后其它的项目只要复制粘贴就行了。
和得到Jar包依赖一样,也有两种方式得到该配置文件。
第一种方法是直接在Jetty官网中下载,然后根据自己的实际情况改下就行了:http://docs.codehaus.org/display/JETTY/jetty.xml
第二种方式是复制以下内容,然后粘贴保存就行了:
- <?xml version="1.0"encoding="GBK"?>
- <!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTDConfigure//EN" "http://jetty.mortbay.org/configure.dtd">
- <Configure id="Server"class="org.mortbay.jetty.Server">
- <Set name="ThreadPool">
- <New class="org.mortbay.thread.BoundedThreadPool">
- <Set name="minThreads">10</Set>
- <Set name="maxThreads">250</Set>
- <Set name="lowThreads">25</Set>
- </New>
- </Set>
- <Property name="org.mortbay.util.URI.charset"default="GBK"/>
- <Call name="addConnector">
- <Arg>
- <NewclassNewclass="org.mortbay.jetty.nio.SelectChannelConnector">
- <Set name="port">
- <SystemPropertynameSystemPropertyname="jetty.port" default="80" /><!--端口号 -->
- </Set>
- <SetnameSetname="maxIdleTime">30000</Set>
- <Set name="Acceptors">2</Set>
- <Set name="statsOn">false</Set>
- <Set name="confidentialPort">8443</Set>
- <SetnameSetname="lowResourcesConnections">5000</Set>
- <SetnameSetname="lowResourcesMaxIdleTime">5000</Set>
- </New>
- </Arg>
- </Call>
- <Set name="sessionIdManager">
- <NewclassNewclass="org.mortbay.jetty.servlet.HashSessionIdManager">
- <Set name="workerName">node1</Set>
- </New>
- </Set>
- <Set name="handler">
- <New id="Handlers"class="org.mortbay.jetty.handler.HandlerCollection">
- <Set name="handlers">
- <ArraytypeArraytype="org.mortbay.jetty.Handler">
- <Item>
- <New id="Contexts"class="org.mortbay.jetty.handler.ContextHandlerCollection" />
- </Item>
- <Item>
- <New id="DefaultHandler"class="org.mortbay.jetty.handler.DefaultHandler" />
- </Item>
- <Item>
- <New id="RequestLog"class="org.mortbay.jetty.handler.RequestLogHandler" />
- </Item>
- </Array>
- </Set>
- </New>
- </Set>
- <Set name="handler">
- <New id="Handlers"class="org.mortbay.jetty.handler.HandlerCollection">
- <Set name="handlers">
- <ArraytypeArraytype="org.mortbay.jetty.Handler">
- <Item>
- <NewclassNewclass="org.mortbay.jetty.webapp.WebAppContext">
- <Set name="contextPath">/</Set><!-- ContextPath-->
- <Set name="resourceBase">./WebRoot</Set><!-- Web应用根目录 -->
- <CallnameCallname="addServlet">
- <Arg>org.mortbay.jetty.servlet.DefaultServlet</Arg>
- <Arg>/</Arg>
- </Call>
- <!-- 增加其它的Servlet -->
- </New>
- </Item>
- </Array>
- </Set>
- </New>
- </Set>
- <Set name="UserRealms">
- <ArraytypeArraytype="org.mortbay.jetty.security.UserRealm"/>
- </Set>
- <Set name="stopAtShutdown">true</Set>
- <Set name="sendServerVersion">true</Set>
- <Set name="gracefulShutdown">1000</Set>
- </Configure>
- <?xml version="1.0"encoding="GBK"?>
- <!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTDConfigure//EN" "http://jetty.mortbay.org/configure.dtd">
- <Configure id="Server"class="org.mortbay.jetty.Server">
- <Set name="ThreadPool">
- <New class="org.mortbay.thread.BoundedThreadPool">
- <Set name="minThreads">10</Set>
- <Set name="maxThreads">250</Set>
- <Set name="lowThreads">25</Set>
- </New>
- </Set>
- <Property name="org.mortbay.util.URI.charset"default="GBK"/>
- <Call name="addConnector">
- <Arg>
- <NewclassNewclass="org.mortbay.jetty.nio.SelectChannelConnector">
- <Set name="port">
- <SystemPropertynameSystemPropertyname="jetty.port" default="80" /><!--端口号 -->
- </Set>
- <SetnameSetname="maxIdleTime">30000</Set>
- <Set name="Acceptors">2</Set>
- <Set name="statsOn">false</Set>
- <Set name="confidentialPort">8443</Set>
- <SetnameSetname="lowResourcesConnections">5000</Set>
- <SetnameSetname="lowResourcesMaxIdleTime">5000</Set>
- </New>
- </Arg>
- </Call>
- <Set name="sessionIdManager">
- <NewclassNewclass="org.mortbay.jetty.servlet.HashSessionIdManager">
- <Set name="workerName">node1</Set>
- </New>
- </Set>
- <Set name="handler">
- <New id="Handlers"class="org.mortbay.jetty.handler.HandlerCollection">
- <Set name="handlers">
- <ArraytypeArraytype="org.mortbay.jetty.Handler">
- <Item>
- <New id="Contexts"class="org.mortbay.jetty.handler.ContextHandlerCollection" />
- </Item>
- <Item>
- <New id="DefaultHandler"class="org.mortbay.jetty.handler.DefaultHandler" />
- </Item>
- <Item>
- <New id="RequestLog"class="org.mortbay.jetty.handler.RequestLogHandler" />
- </Item>
- </Array>
- </Set>
- </New>
- </Set>
- <Set name="handler">
- <New id="Handlers"class="org.mortbay.jetty.handler.HandlerCollection">
- <Set name="handlers">
- <ArraytypeArraytype="org.mortbay.jetty.Handler">
- <Item>
- <NewclassNewclass="org.mortbay.jetty.webapp.WebAppContext">
- <Set name="contextPath">/</Set><!-- ContextPath-->
- <Set name="resourceBase">./WebRoot</Set><!-- Web应用根目录 -->
- <CallnameCallname="addServlet">
- <Arg>org.mortbay.jetty.servlet.DefaultServlet</Arg>
- <Arg>/</Arg>
- </Call>
- <!-- 增加其它的Servlet -->
- </New>
- </Item>
- </Array>
- </Set>
- </New>
- </Set>
- <Set name="UserRealms">
- <ArraytypeArraytype="org.mortbay.jetty.security.UserRealm"/>
- </Set>
- <Set name="stopAtShutdown">true</Set>
- <Set name="sendServerVersion">true</Set>
- <Set name="gracefulShutdown">1000</Set>
- </Configure>
该配置文件要修改的部分一般只有三处:端口号、上下文(ContextPath)和Web应用根目录。
三、启动jetty
目前发现的最好最快的直接在ECLIPSE中JETTY调试方式
适用于6.1.3以上,包括6.1.5的JETTY。
它主要是利用了JDK的代码自动更换性能(code hot replace),可以不用重启JETTY就调试、更换资源文件。注意:一定是DEBUG方式运行才有这项功能。
所以应该说这篇文章的方法更好:
在Run->Debug中,New一个Java Application的配置,填入:
org.mortbay.xml.XmlConfiguration
参数填入一个自己的JETTY配置文件:
完成的myjetty.xml配置文件,请将其中的相应目录修改成自己项目的目录:
- <?xml version="1.0"?>
- <!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTD Configure//EN" "http://jetty.mortbay.org/configure.dtd">
- <!-- =============================================================== -->
- <!-- Configure the Jetty Server -->
- <!-- -->
- <!-- Documentation of this file format can be found at: -->
- <!-- http://docs.codehaus.org/display/JETTY/jetty.xml -->
- <!-- -->
- <!-- =============================================================== -->
- <Configure id="Server" class="org.mortbay.jetty.Server">
- <!-- =========================================================== -->
- <!-- Server Thread Pool -->
- <!-- =========================================================== -->
- <Set name="ThreadPool">
- <!-- Default bounded blocking threadpool
- -->
- <New class="org.mortbay.thread.BoundedThreadPool">
- <Set name="minThreads">10</Set>
- <Set name="maxThreads">250</Set>
- <Set name="lowThreads">25</Set>
- </New>
- <!-- Optional Java 5 bounded threadpool with job queue
- <New class="org.mortbay.thread.concurrent.ThreadPool">
- <Set name="corePoolSize">250</Set>
- <Set name="maximumPoolSize">250</Set>
- </New>
- -->
- </Set>
- <!-- =========================================================== -->
- <!-- Set connectors -->
- <!-- =========================================================== -->
- <!-- One of each type! -->
- <!-- =========================================================== -->
- <!-- Use this connector for many frequently idle connections
- and for threadless continuations.
- -->
- <Call name="addConnector">
- <Arg>
- <New class="org.mortbay.jetty.nio.SelectChannelConnector">
- <Set name="port"><SystemProperty name="jetty.port" default="8080"/></Set>
- <Set name="maxIdleTime">30000</Set>
- <Set name="Acceptors">2</Set>
- <Set name="statsOn">false</Set>
- <Set name="confidentialPort">8443</Set>
- <Set name="lowResourcesConnections">5000</Set>
- <Set name="lowResourcesMaxIdleTime">5000</Set>
- </New>
- </Arg>
- </Call>
- <!-- Use this connector if NIO is not available.
- <Call name="addConnector">
- <Arg>
- <New class="org.mortbay.jetty.bio.SocketConnector">
- <Set name="port">8081</Set>
- <Set name="maxIdleTime">50000</Set>
- <Set name="lowResourceMaxIdleTime">1500</Set>
- </New>
- </Arg>
- </Call>
- -->
- <!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
- <!-- To add a HTTPS SSL listener -->
- <!-- see jetty-ssl.xml to add an ssl connector. use -->
- <!-- java -jar start.jar etc/jetty.xml etc/jetty-ssl.xml -->
- <!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
- <!-- =========================================================== -->
- <!-- Set up global session ID manager -->
- <!-- =========================================================== -->
- <!--
- <Set name="sessionIdManager">
- <New class="org.mortbay.jetty.servlet.HashSessionIdManager">
- <Set name="workerName">node1</Set>
- </New>
- </Set>
- -->
- <!-- =========================================================== -->
- <!-- Set handler Collection Structure -->
- <!-- =========================================================== -->
- <Set name="handler">
- <New id="Handlers" class="org.mortbay.jetty.handler.HandlerCollection">
- <Set name="handlers">
- <Array type="org.mortbay.jetty.Handler">
- <Item>
- <New id="Contexts" class="org.mortbay.jetty.handler.ContextHandlerCollection"/>
- </Item>
- <Item>
- <New id="DefaultHandler" class="org.mortbay.jetty.handler.DefaultHandler"/>
- </Item>
- <Item>
- <New id="RequestLog" class="org.mortbay.jetty.handler.RequestLogHandler"/>
- </Item>
- </Array>
- </Set>
- </New>
- </Set>
- <Set name="handler">
- <New id="Handlers" class="org.mortbay.jetty.handler.HandlerCollection">
- <Set name="handlers">
- <Array type="org.mortbay.jetty.Handler">
- <!--Item>
- <New id="RequestLog" class="org.mortbay.jetty.handler.RequestLogHandler"/>
- </Item-->
- <Item>
- <New class="org.mortbay.jetty.webapp.WebAppContext">
- <Set name="contextPath">/ebnms</Set>
- <Set name="resourceBase">E:/Prj2/ForMe/Src/flower/src/main/webapp</Set>
- <Call name="addServlet">
- <Arg>org.mortbay.jetty.servlet.DefaultServlet</Arg>
- <Arg>/</Arg>
- </Call>
- </New>
- </Item>
- </Array>
- </Set>
- </New>
- </Set>
- <!-- =========================================================== -->
- <!-- Configure Authentication Realms -->
- <!-- Realms may be configured for the entire server here, or -->
- <!-- they can be configured for a specific web app in a context -->
- <!-- configuration (see $(jetty.home)/contexts/test.xml for an -->
- <!-- example). -->
- <!-- =========================================================== -->
- <Set name="UserRealms">
- <Array type="org.mortbay.jetty.security.UserRealm">
- <!--
- <Item>
- <New class="org.mortbay.jetty.security.HashUserRealm">
- <Set name="name">Test Realm</Set>
- <Set name="config"><SystemProperty name="jetty.home" default="."/>/etc/realm.properties</Set>
- </New>
- </Item>
- -->
- </Array>
- </Set>
- <!-- =========================================================== -->
- <!-- Configure Request Log -->
- <!-- Request logs may be configured for the entire server here, -->
- <!-- or they can be configured for a specific web app in a -->
- <!-- contexts configuration (see $(jetty.home)/contexts/test.xml -->
- <!-- for an example). -->
- <!-- =========================================================== -->
- <!--Ref id="RequestLog">
- <Set name="requestLog">
- <New id="RequestLogImpl" class="org.mortbay.jetty.NCSARequestLog">
- <Set name="filename"><SystemProperty name="jetty.logs" default="./logs"/>/yyyy_mm_dd.request.log</Set>
- <Set name="filenameDateFormat">yyyy_MM_dd</Set>
- <Set name="retainDays">90</Set>
- <Set name="append">true</Set>
- <Set name="extended">true</Set>
- <Set name="logCookies">false</Set>
- <Set name="LogTimeZone">GMT</Set>
- </New>
- </Set>
- </Ref-->
- <!-- =========================================================== -->
- <!-- extra options -->
- <!-- =========================================================== -->
- <Set name="stopAtShutdown">true</Set>
- <Set name="sendServerVersion">true</Set>
- <!--Set name="sendDateHeader">true</Set-->
- <!--Set name="gracefulShutdown">1000</Set-->
- </Configure>
Jetty buffers static content for webapps such as html files, css files, images etc and uses memory mapped files to do this if the NIO connectors are being used. The problem is that on Windows, memory mapping a file causes the file to be locked, so that the file cannot be updated or replaced. This means that effectively you have to stop Jetty in order to update a file.
怪不得以前在ubuntu下没有这个问题,转到windows下就发现这个问题了。
解决办法就是找到run-jetty-run插件里面的jetty.jar。jetty.jar可以在eclipse中的jetty启动里面的Classpath中找到。 看下图
找到jetty.jar后解压,编辑org/mortbay/jetty/webapp/webdefault.xml这个文件。把useFileMappedBuffer改成false。这里也就是禁用memory mapped file.
- <init-param>
- <param-name>useFileMappedBuffer</param-name>
- <param-value>true</param-value> <!-- change to false -->
- </init-param>