怎么使用MAVEN打JAR包

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使用MAVEN打JAR包

一、简单的方法：

首先在pom.xml里面添加：

<build>  
    <plugins>  
      <plugin>  
        <artifactId>maven-assembly-plugin</artifactId>  
        <configuration>  
          <descriptorRefs>  
            <descriptorRef>jar-with-dependencies</descriptorRef>  
          </descriptorRefs> 
          <archive>  
            <manifest>  
              <mainClass>com.qunar.piao.data.integration.Boot</mainClass>  
            </manifest>  
            <!-- 需要执行的main -->
          </archive>           
        </configuration>  
      </plugin>  
    </plugins>  
  </build>

然后执行：mvn assembly:assembly 

最后执行：java   -jar target/ticket-data-integration-0.0.1-SNAPSHOT-jar-with-dependencies.jar 

二、执行任意main方法

两个类，Boot类：

package com.qunar.check.integration;

public class Boot {

    public static void main(String[] args){
        System.out.println("test xingxing");
    }
}

Boot2类：

package com.qunar.check.integration;

public class Boot2 {
    public static void main(String[] args){
        System.out.println("test liqiu");
    }
}

那么执行：

$ java -classpath target/check-jar-with-dependencies.jar com.qunar.check.integration.Boot2
test liqiu
$ java -classpath target/check-jar-with-dependencies.jar com.qunar.check.integration.Boot
test xingxing

两个main函数都可以执行

扩展：maven 使用assembly 进行打包

1. pom 中添加assembly 插件

要使用assembly 进项编译打包， 首先主要在pom 中的build中添加插件信息， 具体如图下所示：

<build>
    <finalName>${project.artifactId}</finalName>
    <sourceDirectory>src/main/java</sourceDirectory>
    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <filtering>true</filtering>
            <includes>
                <include>**/*.xml</include>
                <include>**/*.properties</include>
            </includes>
        </resource>
        <resource>
            <directory>${profile.dir}</directory>
            <filtering>true</filtering>
        </resource>
    </resources>

    <plugins>
        <!-- compiler插件参数设置，指定编码 -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
                <encoding>utf-8</encoding>
            </configuration>
        </plugin>

        <!--   这个插件是关键   -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-assembly-plugin</artifactId>
            <configuration>
                <!--   这个是assembly 所在位置  -->
                <descriptor>src/main/assembly/assembly.xml</descriptor>
            </configuration>
            <executions>
                <execution>
                    <id>make-assembly</id>
                    <phase>package</phase>
                    <goals>
                        <goal>single</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

2. 创建assembly文件夹和assembly.xml文件

创建assembly文件夹和assembly.xml文件, 这个样子创建主要是规范。
在pom 中已经介绍assembly.xml 位置。

<!--   这个是assembly 所在位置  -->
<descriptor>src/main/assembly/assembly.xml</descriptor>

创建assembly.xml 文件后添加如下内容：

<assembly>
    <formats>
        <!--支持 zip，tar，tar.gz，tar.bz2，jar，dir，war 等 -->
        <format>tar.gz</format>
        <format>zip</format>
        <format>dir</format>
    </formats>
    <includeBaseDirectory>false</includeBaseDirectory>
    <fileSets>
        <fileSet>
            <directory>src/main/resources</directory>
            <outputDirectory>conf</outputDirectory>
            <fileMode>0644</fileMode>
        </fileSet>
        <fileSet>
            <directory>${profile.dir}</directory>
            <outputDirectory>conf</outputDirectory>
            <!-- 表示的是包含下面格式的资源文件 -->
            <includes>
                <include>*.xml</include>
                <include>*.properties</include>
                <include>**/*.xml</include>
                <include>**/*.properties</include>
            </includes>
            <fileMode>0644</fileMode>
        </fileSet>
        <fileSet>
            <directory>src/main/assembly/bin</directory>
            <outputDirectory>bin</outputDirectory>
            <fileMode>0755</fileMode>
        </fileSet>
    </fileSets>
    <dependencySets>
        <dependencySet>
            <outputDirectory>lib</outputDirectory>
        </dependencySet>
    </dependencySets>
</assembly>

fileMode 官方解释：

Similar to a UNIX permission, sets the file mode of the files included. THIS IS AN OCTAL VALUE. Format: (User)(Group)(Other) where each component is a sum of Read = 4, Write = 2, and Execute = 1. For example, the value 0644 translates to User read-write, Group and Other

上述的三个fileSet 分别是将resource 下的资源打包到config 目录下， 将assembly下的bin 启动相关脚本打包到bin 目录下， 将maven项目依赖的所有jar 包， 打包到lib 中。
具体结构如下图所示：

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