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Maven中如何配置WAR依赖WAR和JAR的多模块项目结构



先考虑如下实际情况:
  1. war项目C和war项目B都依赖war项目A和JAR项目X. 项目A中保存了B和C项目通用的web资源,比如通用的javascript,CSS,jsp等. 项目X中保存了B和C项目中都依赖的一些class
  2. 开发人员希望每次都只面对一个项目,即Team A 开发项目A, Team B开发项目B, Team C开发项目C....以此类推
  3. 每个Team在开发自己项目时,都希望能直接进行调试,例如war项目A可以直接部署到TOMCAT上运行测试
  4. 最后实际交付给客户的却只有2个项目: B和C .也就是说,最后要打包B和C,而在B和C的war包中都要包含A中的web资源和X中的class

在纯Maven中的实现方案

纯MAVEN环境比较简单,经过一段曲折(先是修改maven-war-plguin源码,再是自定义一个插件),最后发现居然有一个现成的插件可以实现这个功能,示范如下:

   com.isoftstone.gads
   common-web
   0.0.1-SNAPSHOT
   war

   com.isoftstone.gads
   common-web
   0.0.1-SNAPSHOT
   warpath
 
    org.apache.maven.plugins
    maven-war-plugin
    2.1-beta-1
    
     <!- 必须指定,否则默认会变成在target/war/work 导致被打包进war文件,指定后为target/work ->
     ${project.build.directory}/work
     WebContent
     false
     
      true
     
     
      
       com.isoftstone.gads
       ebiz-common-web
      
      
       
       
       
      
     
     */web.xml,WEB-INF/lib/*,/sql-map-config.xml,/jdbc.properties,/META-INF/*
    
   

    org.appfuse.plugins
    maven-warpath-plugin
    2.1.0-M1
    true
    
     
      
       add-classes
      
     
    
    
     **/logback-test.xml
    
注意红色部分,说明如下:
  1. 首先是使用了maven-warpath-plugin插件,处理所有warpath的artifact,这个插件可以将从依赖的WAR中传递的依赖都打包到当前的WAR中,没有这个插件时,当前WAR从所依赖的WAR artifact那所传递来的依赖在打包成WAR时都会被忽略.既然现在能将传递的依赖打包了,就不用copy依赖的war中的WEB-INF/lib/*,所以被加入到中
  2. 的设置看我写的注释
  3. webappDirectory的指定需要额外注意.首先,我使用了MAVEN默认的资源路径,也就是 src/main/webapp,而这里却告诉maven-war-plugin另一个路径"WebContent",产生的结果就是,执行mvn package时,war-plugin和warpath-plugin会将当前war和所有依赖的war的web资源都拷贝到WebContent目录下.这样,WebContent目录包含的内容就是最终打包成WAR的内容了.

在eclipse集成了Maven插件时的实现方案

纯MAVEN确实很happy,但是我们开发项目可是要在eclipse中进行的,安装了M2E插件后 ,如何利用eclipse的WTP提供的SERVER功能进行快速的部署调式,是个需要解决的问题.
  1. 在eclipse的配置文件".settings/.jsdtscope"修改src/main/webapp"/>为WebContent"/>
  2. 在".settings/org.eclipse.wst.common.component"中把/" source-path="/src/main/webapp"/>修改WEB-INF/classes" source-path="/src/main/webapp"/>,并增加
  3. OK,经过上述配置后,eclipse就把/WebContent目录认为web资源根路径了.这样在eclipse的Servers View中,把这个war项目增加到TOMCAT上时,实际部署的就是/WebContent ,可以直接在eclipse部署运行这个war项目了
  4. 但是....实现了可以在eclipse上直接部署的功能后,我发现丧失了eclipse的文件变化监视功能.比如,原本在eclipse中修改一个jsp后,就可以自动同步到TOMCAT上,但现在我实际的web资源路径是src/main/webapp, 而eclipse识别的web资源路径却是WebConten.我的文件修改都是在src/main/webapp,不执行mvn package是不会同步到WebContent中,eclipse也就不会把我修改的JSP同步到TOMCAT上.为了解决这个问题,我自定义了一个插件,示例如下:

    org.apache.maven.plugins
    maven-websources-plugin
    0.0.1-SNAPSHOT
    
     
      
       webSources
      

     
    
   这个插件绑定了@phase process-resources,所以在src/main/webapp下的文件有变化时,会自动被调用,将src/main/webapp下有变化的文件拷贝到WebContent目录下.这时就会被eclipse发现这个变化,从而同步到TOMCAT上.

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