Maven分离配置、依赖

文章转自：http://blog.csdn.net/u010376788/article/details/56968353

在用Maven打包项目时，要像Hadoop、Spark、Hive等项目打包之后的文件包含bin、lib、conf之类的文件夹，同时可以动态的修改项目的配置参数，需要如下两步：
在 pom.xml 文件中引入 maven-assembly 插件；
在 assembly.xml 文件中制定各个文件目录。

pom.xml引入maven-assembly插件

<plugin>    <groupId>org.apache.maven.plugins</groupId>    <artifactId>maven-assembly-plugin</artifactId>    <configuration>        <appendAssemblyId>true</appendAssemblyId>        <descriptors>            <descriptor>src/assembly/assembly.xml</descriptor>        </descriptors>    </configuration>    <executions>        <execution>            <id>maven-assembly</id>            <phase>package</phase>            <goals>                <goal>single</goal>            </goals>        </execution>    </executions></plugin>

然后，是src／assembly／assembly.xml文件：

<?xml version="1.0" encoding="UTF-8"?><assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"          xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.1 http://maven.apache.org/xsd/assembly-1.1.1.xsd">    <id>all</id>    <formats>        <format>tar.gz</format>    </formats>    <includeBaseDirectory>false</includeBaseDirectory>    <fileSets>        <fileSet>            <directory>bin</directory>            <outputDirectory>bin</outputDirectory>            <fileMode>755</fileMode>        </fileSet>        <fileSet>            <directory>src/main/resources</directory>            <outputDirectory>conf</outputDirectory>            <fileMode>755</fileMode>            <lineEnding>unix</lineEnding>            <excludes>                <exclude>*.formatted</exclude>            </excludes>        </fileSet>    </fileSets>    <dependencySets>        <dependencySet>            <fileMode>755</fileMode>            <outputDirectory>lib</outputDirectory>            <scope>runtime</scope>            <useProjectArtifact>false</useProjectArtifact>            <excludes>                <exclude>${project.groupId}:${project.artifactId}</exclude>            </excludes>        </dependencySet>        <dependencySet>            <fileMode>755</fileMode>            <outputFileNameMapping>${project.artifactId}.jar</outputFileNameMapping>            <outputDirectory>/lib/</outputDirectory>            <scope>runtime</scope>            <includes>                <include>${project.groupId}:${project.artifactId}</include>            </includes>        </dependencySet>    </dependencySets></assembly>

不难发现，我们把打好的程序jar包也放到了 lib目录 中。

执行代码
用这种方法打的jar包，是不包含依赖的jar包和配置文件的。所以，在执行之前需要把依赖的jar包和配置文件加入到 $CLASSPATH 中，Shell脚本如下：

#!/usr/bin/env bashBIN=`dirname $0`BIN=`cd $BIN; pwd`APP_HOME=`dirname $BIN`JAVA=${JAVA_HOME}/bin/javaCLASSPATH=${APP_HOME}/conf#JAR=${APP_HOME}/tools.jarfor f in ${APP_HOME}/lib/*.jar; do    CLASSPATH=${CLASSPATH}:$fdonefor f in ${APP_HOME}/*.jar; do    CLASSPATH=${CLASSPATH}:$fdoneMAINCLASS="edu.wzm.joda.JodaDemo"exec "$JAVA" -classpath $CLASSPATH $MAINCLASS