[MAVEN]web工程的调试

 

接上篇：[MAVEN]maven最佳实践 

maven风格的WEB程序怎样调试？

 

标准web目录结构

• Introduction to the Standard Directory Layout

src/main/java	Application/Library sources
src/main/resources	Application/Library resources
src/main/filters	Resource filter files
src/main/assembly	Assembly descriptors
src/main/config	Configuration files
src/main/scripts	Application/Library scripts
src/main/webapp	Web application sources
src/test/java	Test sources
src/test/resources	Test resources
src/test/filters	Test resource filter files
src/site	Site
LICENSE.txt	Project's license
NOTICE.txt	Notices and attributions required by libraries that the project depends on
README.txt	Project's readme

 

web项目调试最佳实践

• 问题，jar都让maven管理了，web-inf/lib下没有jar了，这个时候怎样调试web呢？

• 原理：无论tomcat还是jetty作为web容器，最终启动他们的命令行都是：“java ....” 即他们都是标准的java应用程序启动方式，所以对于maven管理的web工程，手动添加jar到classpath即可了

编程方式使用tomcat调试maven war工程

 

1. 定义tomcat配置文件：src/test/resources/tomcat.properties
   

   catalina.home=/prog/apache/apache-tomcat-7.0.27-dev
   catalina.base=/workspace/com.talkyun.flex/Servers/dev-cloud-site

    
2. TomcatStart.java启动代码：src/test/java/server/TomcatStart.java
   

   package server;
   
   import java.io.IOException;
   import java.lang.reflect.Method;
   import java.net.URL;
   import java.net.URLClassLoader;
   import java.nio.file.Path;
   import java.nio.file.Paths;
   import java.util.Properties;
   
   /** 启动tomcat */
   public class TomcatStart {
   	
   	/** 设置tomcat启动需要的classpath、catalina.home和catalina.base设置 */
   	private static void setTomcatEnv(Properties tomcatConfig) throws ReflectiveOperationException, IOException {
   		String catalinaHome = tomcatConfig.getProperty("catalina.home");
   		System.setProperty("catalina.home", catalinaHome);
   		System.setProperty("catalina.base", tomcatConfig.getProperty("catalina.base", catalinaHome));
   		
   		
   		Path bootstrapJar =  Paths.get(catalinaHome, "bin/bootstrap.jar"), tomcatJuliJar = bootstrapJar.resolveSibling("tomcat-juli.jar");
   		ClassLoader classloader = Thread.currentThread().getContextClassLoader();
   		Method addURLMethod = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
   		try {
   			addURLMethod.setAccessible(true);
   			addURLMethod.invoke(classloader, bootstrapJar.toUri().toURL());
   			addURLMethod.invoke(classloader, tomcatJuliJar.toUri().toURL());
   			try {
   				classloader.loadClass("javax.servlet.ServletContainerInitializer");
   			} catch (ClassNotFoundException e) {
   				addURLMethod.invoke(classloader, Paths.get(catalinaHome, "lib/servlet-api.jar").toUri().toURL());
   			}
   		} finally {
   			addURLMethod.setAccessible(false);
   		}
   	}
   	
   	/** 启动tomcat */
   	private static void start() throws ReflectiveOperationException {
   		Class<?> bootstrapClazz = Class.forName("org.apache.catalina.startup.Bootstrap");
   		Method main = bootstrapClazz.getDeclaredMethod("main", String[].class);
   		main.invoke(bootstrapClazz, (Object) new String[] {"start"});
   	}
   
   	/** 请在 classpath:/tomcat.properties中设定： catalina.home, catalina.base(默认使用catalina.home) */
   	public static void main(String[] args) throws Exception {
   		Properties tomcatConfig = new Properties();
   		tomcatConfig.load(TomcatStart.class.getResourceAsStream("/tomcat.properties"));
   		
   		setTomcatEnv(tomcatConfig);
   		start();
   	}
   
   }
   

    

 

 

tomcat调试maven web工程

1. 定义Variable变量：

   1. 打开首选项：Windows->Preferences

   2. 定义变量：Run/Debug -> String Substitution：选择右边的新建，建立变量，名称：TOMCAT_HOME，配置为tomcat的路径，如图：

      

2. 定义一个java application debug启动：

   1. 打开Debug Configurations配置：Run -> Debug Configurations

   2. 选择左边的Java Application，右键新建一个新的Java Application启动配置：取名为：tomcat-dev

      1. Main选项卡：Main class输入：org.apache.catalina.startup.Bootstrap

         
          

      2. Arguments选项卡：

         • Program arguments配置填写：start

         • VM arguments配置填写：

           • -Dcatalina.home=${TOMCAT_HOME}
             -Dcatalina.base=${TOMCAT_HOME}
             -Djava.endorsed.dirs=${TOMCAT_HOME}/common/endorsed 
             -Djava.io.tmpdir=${TOMCAT_HOME}/temp 
             -Djava.library.path=${TOMCAT_HOME}/bin:/usr/local/apr/lib 
             -Dsun.io.useCanonCaches=false 
             -server
             

             
              

         • Working directory配置填写：Other: ${TOMCAT_HOME}

      3. Classpath选项卡：
         • 去掉项目的classpath，只保留Maven Dependencies项即可

         • 选中User Entries：按右边的Advanced添加三个jar包，如：在弹出的Advanced Options对话框中填写Add Variable String项目：${TOMCAT_HOME}/bin/bootstrap.jar

           • ${TOMCAT_HOME}/bin/bootstrap.jar
             ${TOMCAT_HOME}/bin/tomcat-juli.jar
             ${TOMCAT_HOME}/lib/servlet-api.jar