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Eclipse中如何调试Web项目

 
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开发中调试WEB项目算是程序员最基本的技能了!

 

厌烦了开发的时候将WEB项目打好war包,再部署到容器中运行,效率极低,而且修改了程序不能立即生效。

 

Eclipse中调试Web项目:

首选Jetty插件。当然也可以用Tomcat插件,不过比较喜欢Jetty的小巧。

使用Jetty有2种方法:

POM中配置Jetty插件

run-jetty-run插件,更简单快速,若结合DCEVM将更厉害,增加方法都不用重启服务,Diao爆了!

 

 

先记录一种实验成功的方式(jetty-maven-plugin)

此方式支持方法体内代码的修改,会马上生效,不用重启服务。

如果想增加方法也立即生效,考虑使用DCEVM!

 

第一步:POM中配置Plugin

<plugins>
	<plugin>
		<groupId>org.eclipse.jetty</groupId>
		<artifactId>jetty-maven-plugin</artifactId>
		<configuration>
			<webApp>
				<defaultsDescriptor>src/main/resources/webdefault.xml</defaultsDescriptor>
			</webApp>
		</configuration>
	</plugin>

 

 

由于Jetty启动后会锁住静态资源文件,导致无法修改静态文件,如js文件修改后不能保存。。。

因此,需要关闭Jetty对静态资源的缓存。

在resources目录中增加webdefault.xml文件,重置缓存配置。(见最后)

 

 

第二步,在Eclipse菜单栏选择Run->External Tools->Extenal Tools Configuration

Program上右键,点击New

【Main】选项下,配置:

Location  选择系统中安装的Maven/bin/mvnDebug.bat

Working Directory 选择需要调试的项目

Arguments 输入jetty:run

 

【Environment】

输入Maven的配置参数

Name:  MAVEN_OPTS

Value:  -Xdebug-Xnoagent-Djava.compiler=NONE-Xrunjdwp:transport=dt_socket,address=4000,server=y,suspend=y

 

第三步,Run->Debug Configurations -> Remote Java Application

右键New

Project 

Browse... 选择需要调试的项目

Connection Type

Standard(Socket Attach)

Connection Properties

Host:localhost

Port : 8000 (此端口与第四步启动后监听的端口必须相同)

勾选Allow Terminate of reomte VM

 

第四步,运行第二步中配置好的Program

启动后,控制台会输出如下信息:

Preparing to Execute Maven in Debug Mode
Listening for transport dt_socket at address: 8000

 

第五步,运行第三步中配置好的调试命令,启动Jetty

验证:http://localhost:8080/index.html 

 

正确停止Jetty

切换至Debug视图,在Debug窗口中Terminate掉Remote Java Application即可!

注意:如果直接在Console窗口时Terminate,再次运行时会发生端口被占用的情况。

 

================================================================================

 

解除Jetty启动后不能修改静态文件的限制:webdefault.xml

 useFileMappedBuffer  = false

<?xml version="1.0" encoding="UTF-8"?>
<web-app 
   xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
   metadata-complete="false"
   version="3.1"> 

  <!-- ===================================================================== -->
  <!-- This file contains the default descriptor for web applications.       -->
  <!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
  <!-- The intent of this descriptor is to include jetty specific or common  -->
  <!-- configuration for all webapps.   If a context has a webdefault.xml    -->
  <!-- descriptor, it is applied before the contexts own web.xml file        -->
  <!--                                                                       -->
  <!-- A context may be assigned a default descriptor by:                    -->
  <!--  + Calling WebApplicationContext.setDefaultsDescriptor                -->
  <!--  + Passed an arg to addWebApplications                                -->
  <!--                                                                       -->
  <!-- This file is used both as the resource within the jetty.jar (which is -->
  <!-- used as the default if no explicit defaults descriptor is set) and it -->
  <!-- is copied to the etc directory of the Jetty distro and explicitly     -->
  <!-- by the jetty.xml file.                                                -->
  <!--                                                                       -->
  <!-- ===================================================================== -->

  <description>
    Default web.xml file.  
    This file is applied to a Web application before it's own WEB_INF/web.xml file
  </description>

  <!-- ==================================================================== -->
  <!-- Removes static references to beans from javax.el.BeanELResolver to   -->
  <!-- ensure webapp classloader can be released on undeploy                -->
  <!-- ==================================================================== -->
  <listener>
   <listener-class>org.eclipse.jetty.servlet.listener.ELContextCleaner</listener-class>
  </listener>
  
  <!-- ==================================================================== -->
  <!-- Removes static cache of Methods from java.beans.Introspector to      -->
  <!-- ensure webapp classloader can be released on undeploy                -->
  <!-- ==================================================================== -->  
  <listener>
   <listener-class>org.eclipse.jetty.servlet.listener.IntrospectorCleaner</listener-class>
  </listener>
  

  <!-- ==================================================================== -->
  <!-- Context params to control Session Cookies                            -->
  <!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  -->
  <!--
    UNCOMMENT TO ACTIVATE 
    <context-param> 
      <param-name>org.eclipse.jetty.servlet.SessionDomain</param-name> 
      <param-value>127.0.0.1</param-value> 
    </context-param> 
    <context-param>
      <param-name>org.eclipse.jetty.servlet.SessionPath</param-name>
      <param-value>/</param-value>
    </context-param>
    <context-param>
      <param-name>org.eclipse.jetty.servlet.MaxAge</param-name>
      <param-value>-1</param-value>
    </context-param>
  -->

  <!-- ==================================================================== -->
  <!-- The default servlet.                                                 -->
  <!-- This servlet, normally mapped to /, provides the handling for static -->
  <!-- content, OPTIONS and TRACE methods for the context.                  -->
  <!-- The following initParameters are supported:                          -->
  <!--  
 *  acceptRanges      If true, range requests and responses are
 *                    supported
 *
 *  dirAllowed        If true, directory listings are returned if no
 *                    welcome file is found. Else 403 Forbidden.
 *
 *  welcomeServlets   If true, attempt to dispatch to welcome files
 *                    that are servlets, but only after no matching static
 *                    resources could be found. If false, then a welcome
 *                    file must exist on disk. If "exact", then exact
 *                    servlet matches are supported without an existing file.
 *                    Default is true.
 *
 *                    This must be false if you want directory listings,
 *                    but have index.jsp in your welcome file list.
 *
 *  redirectWelcome   If true, welcome files are redirected rather than
 *                    forwarded to.
 *
 *  gzip              If set to true, then static content will be served as
 *                    gzip content encoded if a matching resource is
 *                    found ending with ".gz"
 *
 *  resourceBase      Set to replace the context resource base
 *
 *  resourceCache     If set, this is a context attribute name, which the servlet
 *                    will use to look for a shared ResourceCache instance.
 *
 *  relativeResourceBase
 *                    Set with a pathname relative to the base of the
 *                    servlet context root. Useful for only serving static content out
 *                    of only specific subdirectories.
 *
 *  pathInfoOnly      If true, only the path info will be applied to the resourceBase
 *
 *  stylesheet        Set with the location of an optional stylesheet that will be used
 *                    to decorate the directory listing html.
 *
 *  aliases           If True, aliases of resources are allowed (eg. symbolic
 *                    links and caps variations). May bypass security constraints.
 *                    
 *  etags             If True, weak etags will be generated and handled.
 *
 *  maxCacheSize      The maximum total size of the cache or 0 for no cache.
 *  maxCachedFileSize The maximum size of a file to cache
 *  maxCachedFiles    The maximum number of files to cache
 *
 *  useFileMappedBuffer
 *                    If set to true, it will use mapped file buffer to serve static content
 *                    when using NIO connector. Setting this value to false means that
 *                    a direct buffer will be used instead of a mapped file buffer.
 *                    By default, this is set to true.
 *
 *  cacheControl      If set, all static content will have this value set as the cache-control
 *                    header.
 *
 -->
 
 
  <!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  -->
  <servlet>
    <servlet-name>default</servlet-name>
    <servlet-class>org.eclipse.jetty.servlet.DefaultServlet</servlet-class>
    <init-param>
      <param-name>aliases</param-name>
      <param-value>false</param-value>
    </init-param>
    <init-param>
      <param-name>acceptRanges</param-name>
      <param-value>true</param-value>
    </init-param>
    <init-param>
      <param-name>dirAllowed</param-name>
      <param-value>true</param-value>
    </init-param>
    <init-param>
      <param-name>welcomeServlets</param-name>
      <param-value>false</param-value>
    </init-param>
    <init-param>
      <param-name>redirectWelcome</param-name>
      <param-value>false</param-value>
    </init-param>
    <init-param>
      <param-name>maxCacheSize</param-name>
      <param-value>256000000</param-value>
    </init-param>
    <init-param>
      <param-name>maxCachedFileSize</param-name>
      <param-value>200000000</param-value>
    </init-param>
    <init-param>
      <param-name>maxCachedFiles</param-name>
      <param-value>2048</param-value>
    </init-param>
    <init-param>
      <param-name>gzip</param-name>
      <param-value>false</param-value>
    </init-param>
    <init-param>
      <param-name>etags</param-name>
      <param-value>false</param-value>
    </init-param>
    <init-param>
      <param-name>useFileMappedBuffer</param-name>
      <param-value>false</param-value>
    </init-param>
    <!--
    <init-param>
      <param-name>resourceCache</param-name>
      <param-value>resourceCache</param-value>
    </init-param>
    -->
    <!--
    <init-param>
      <param-name>cacheControl</param-name>
      <param-value>max-age=3600,public</param-value>
    </init-param>
    -->
    <load-on-startup>0</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>


  <!-- ==================================================================== -->
  <!-- JSP Servlet                                                          -->
  <!-- This is the jasper JSP servlet from the jakarta project              -->
  <!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  -->
  <!-- The JSP page compiler and execution servlet, which is the mechanism  -->
  <!-- used by Glassfish to support JSP pages.  Traditionally, this servlet -->
  <!-- is mapped to URL patterh "*.jsp".  This servlet supports the         -->
  <!-- following initialization parameters (default values are in square    -->
  <!-- brackets):                                                           -->
  <!--                                                                      -->
  <!--   checkInterval       If development is false and reloading is true, -->
  <!--                       background compiles are enabled. checkInterval -->
  <!--                       is the time in seconds between checks to see   -->
  <!--                       if a JSP page needs to be recompiled. [300]    -->
  <!--                                                                      -->
  <!--   compiler            Which compiler Ant should use to compile JSP   -->
  <!--                       pages.  See the Ant documenation for more      -->
  <!--                       information. [javac]                           -->
  <!--                                                                      -->
  <!--   classdebuginfo      Should the class file be compiled with         -->
  <!--                       debugging information?  [true]                 -->
  <!--                                                                      -->
  <!--   classpath           What class path should I use while compiling   -->
  <!--                       generated servlets?  [Created dynamically      -->
  <!--                       based on the current web application]          -->
  <!--                       Set to ? to make the container explicitly set  -->
  <!--                       this parameter.                                -->
  <!--                                                                      -->
  <!--   development         Is Jasper used in development mode (will check -->
  <!--                       for JSP modification on every access)?  [true] -->
  <!--                                                                      -->
  <!--   enablePooling       Determines whether tag handler pooling is      -->
  <!--                       enabled  [true]                                -->
  <!--                                                                      -->
  <!--   fork                Tell Ant to fork compiles of JSP pages so that -->
  <!--                       a separate JVM is used for JSP page compiles   -->
  <!--                       from the one Tomcat is running in. [true]      -->
  <!--                                                                      -->
  <!--   ieClassId           The class-id value to be sent to Internet      -->
  <!--                       Explorer when using <jsp:plugin> tags.         -->
  <!--                       [clsid:8AD9C840-044E-11D1-B3E9-00805F499D93]   -->
  <!--                                                                      -->
  <!--   javaEncoding        Java file encoding to use for generating java  -->
  <!--                       source files. [UTF-8]                          -->
  <!--                                                                      -->
  <!--   keepgenerated       Should we keep the generated Java source code  -->
  <!--                       for each page instead of deleting it? [true]   -->
  <!--                                                                      -->
  <!--   logVerbosityLevel   The level of detailed messages to be produced  -->
  <!--                       by this servlet.  Increasing levels cause the  -->
  <!--                       generation of more messages.  Valid values are -->
  <!--                       FATAL, ERROR, WARNING, INFORMATION, and DEBUG. -->
  <!--                       [WARNING]                                      -->
  <!--                                                                      -->
  <!--   mappedfile          Should we generate static content with one     -->
  <!--                       print statement per input line, to ease        -->
  <!--                       debugging?  [false]                            -->
  <!--                                                                      -->
  <!--                                                                      -->
  <!--   reloading           Should Jasper check for modified JSPs?  [true] -->
  <!--                                                                      -->
  <!--   suppressSmap        Should the generation of SMAP info for JSR45   -->
  <!--                       debugging be suppressed?  [false]              -->
  <!--                                                                      -->
  <!--   dumpSmap            Should the SMAP info for JSR45 debugging be    -->
  <!--                       dumped to a file? [false]                      -->
  <!--                       False if suppressSmap is true                  -->
  <!--                                                                      -->
  <!--   scratchdir          What scratch directory should we use when      -->
  <!--                       compiling JSP pages?  [default work directory  -->
  <!--                       for the current web application]               -->
  <!--                                                                      -->
  <!--   tagpoolMaxSize      The maximum tag handler pool size  [5]         -->
  <!--                                                                      -->
  <!--   xpoweredBy          Determines whether X-Powered-By response       -->
  <!--                       header is added by generated servlet  [false]  -->
  <!--                                                                      -->
  <!-- If you wish to use Jikes to compile JSP pages:                       -->
  <!--   Set the init parameter "compiler" to "jikes".  Define              -->
  <!--   the property "-Dbuild.compiler.emacs=true" when starting Jetty     -->
  <!--   to cause Jikes to emit error messages in a format compatible with  -->
  <!--   Jasper.                                                            -->
  <!--   If you get an error reporting that jikes can't use UTF-8 encoding, -->
  <!--   try setting the init parameter "javaEncoding" to "ISO-8859-1".     -->
  <!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  -->
  <servlet id="jsp">
    <servlet-name>jsp</servlet-name>
    <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
    <init-param>
      <param-name>logVerbosityLevel</param-name>
      <param-value>DEBUG</param-value>
    </init-param>
    <init-param>
      <param-name>fork</param-name>
      <param-value>false</param-value>
    </init-param>
    <init-param>
      <param-name>xpoweredBy</param-name>
      <param-value>false</param-value>
    </init-param>
    <init-param>
      <param-name>compilerTargetVM</param-name>
      <param-value>1.7</param-value>
    </init-param>
    <init-param>
      <param-name>compilerSourceVM</param-name>
      <param-value>1.7</param-value>
    </init-param>
    <!--  
    <init-param>
        <param-name>classpath</param-name>
        <param-value>?</param-value>
    </init-param>
    -->
    <load-on-startup>0</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>jsp</servlet-name>
    <url-pattern>*.jsp</url-pattern>
    <url-pattern>*.jspf</url-pattern>
    <url-pattern>*.jspx</url-pattern>
    <url-pattern>*.xsp</url-pattern>
    <url-pattern>*.JSP</url-pattern>
    <url-pattern>*.JSPF</url-pattern>
    <url-pattern>*.JSPX</url-pattern>
    <url-pattern>*.XSP</url-pattern>
  </servlet-mapping>


  <!-- ==================================================================== -->
  <session-config>
    <session-timeout>30</session-timeout>
  </session-config>

  <!-- ==================================================================== -->
  <!-- Default MIME mappings                                                -->
  <!-- The default MIME mappings are provided by the mime.properties        -->
  <!-- resource in the org.eclipse.jetty.server.jar file.  Additional or modified  -->
  <!-- mappings may be specified here                                       -->
  <!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  -->
  <!-- UNCOMMENT TO ACTIVATE
  <mime-mapping>
    <extension>mysuffix</extension>
    <mime-type>mymime/type</mime-type>
  </mime-mapping>
  -->

  <!-- ==================================================================== -->
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

  <!-- ==================================================================== -->
  <locale-encoding-mapping-list>
    <locale-encoding-mapping>
      <locale>ar</locale>
      <encoding>ISO-8859-6</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>be</locale>
      <encoding>ISO-8859-5</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>bg</locale>
      <encoding>ISO-8859-5</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>ca</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>cs</locale>
      <encoding>ISO-8859-2</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>da</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>de</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>el</locale>
      <encoding>ISO-8859-7</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>en</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>es</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>et</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>fi</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>fr</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>hr</locale>
      <encoding>ISO-8859-2</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>hu</locale>
      <encoding>ISO-8859-2</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>is</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>it</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>iw</locale>
      <encoding>ISO-8859-8</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>ja</locale>
      <encoding>Shift_JIS</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>ko</locale>
      <encoding>EUC-KR</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>lt</locale>
      <encoding>ISO-8859-2</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>lv</locale>
      <encoding>ISO-8859-2</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>mk</locale>
      <encoding>ISO-8859-5</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>nl</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>no</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>pl</locale>
      <encoding>ISO-8859-2</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>pt</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>ro</locale>
      <encoding>ISO-8859-2</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>ru</locale>
      <encoding>ISO-8859-5</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>sh</locale>
      <encoding>ISO-8859-5</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>sk</locale>
      <encoding>ISO-8859-2</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>sl</locale>
      <encoding>ISO-8859-2</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>sq</locale>
      <encoding>ISO-8859-2</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>sr</locale>
      <encoding>ISO-8859-5</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>sv</locale>
      <encoding>ISO-8859-1</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>tr</locale>
      <encoding>ISO-8859-9</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>uk</locale>
      <encoding>ISO-8859-5</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>zh</locale>
      <encoding>GB2312</encoding>
    </locale-encoding-mapping>
    <locale-encoding-mapping>
      <locale>zh_TW</locale>
      <encoding>Big5</encoding>
    </locale-encoding-mapping>
  </locale-encoding-mapping-list>

  <security-constraint>
    <web-resource-collection>
      <web-resource-name>Disable TRACE</web-resource-name>
      <url-pattern>/</url-pattern>
      <http-method>TRACE</http-method>
    </web-resource-collection>
    <auth-constraint/>
  </security-constraint>
  <security-constraint>
    <web-resource-collection>
      <web-resource-name>Enable everything but TRACE</web-resource-name>
      <url-pattern>/</url-pattern>
      <http-method-omission>TRACE</http-method-omission>
    </web-resource-collection>
  </security-constraint>

</web-app>

 

 

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