Maven分离配置、依赖

阳光穿透心脏的1/2处 2022-07-12 13:53 197阅读 0赞

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：

1.  在 **pom.xml** 文件中引入 **maven-assembly** 插件；  
    
2.  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 bash
    
    BIN=`dirname $0`
    BIN=`cd $BIN; pwd`
    APP_HOME=`dirname $BIN`
    
    JAVA=${JAVA_HOME}/bin/java
    CLASSPATH=${APP_HOME}/conf
    #JAR=${APP_HOME}/tools.jar
    
    for f in ${APP_HOME}/lib/*.jar; do
        CLASSPATH=${CLASSPATH}:$f
    done
    
    for f in ${APP_HOME}/*.jar; do
        CLASSPATH=${CLASSPATH}:$f
    done
    
    MAINCLASS="edu.wzm.joda.JodaDemo"
    exec "$JAVA" -classpath $CLASSPATH $MAINCLASS