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• 1， 简介

先看官方文档：http://maven.apache.org/plugins/maven-assembly-plugin/index.html maven-assembly-plugin可以将依赖的第三方jar包打包到jar中，这样方便我们发布可执行的jar包。

• 2， 用法

用法部分的官方文档：http://maven.apache.org/plugins/maven-assembly-plugin/index.html

      <plugin><artifactId>maven-assembly-plugin</artifactId><version>3.1.0</version><configuration><descriptorRefs><descriptorRef>jar-with-dependencies</descriptorRef></descriptorRefs></configuration><executions><execution><id>make-assembly</id> <!-- this is used for inheritance merges --><phase>package</phase> <!-- bind to the packaging phase --><goals><goal>single</goal></goals></execution></executions></plugin>

• 3，具体示例

具体工程代码在这里。欢迎fork加星，谢谢！
我的pom文件如下

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.yq</groupId><artifactId>MavenPluginDemo</artifactId><version>1.0-SNAPSHOT</version><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.0.0.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!-- fastjson--><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.1.33</version></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.5</version></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger2</artifactId><version>2.7.0</version></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger-ui</artifactId><version>2.7.0</version></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-spring-web</artifactId><version>2.7.0</version></dependency></dependencies><repositories><repository><id>spring-milestones</id><name>Spring Milestones</name><url>https://repo.spring.io/milestone</url><snapshots><enabled>false</enabled></snapshots></repository></repositories><build><plugins><!--<plugin>--><!--<groupId>org.apache.maven.plugins</groupId>--><!--<artifactId>maven-jar-plugin</artifactId>--><!--<version>2.4</version>--><!--<configuration>--><!--<archive>--><!--<manifest>--><!--<addClasspath>true</addClasspath>--><!--<classpathPrefix>lib/</classpathPrefix>--><!--<mainClass>com.yq.WebUserApplication</mainClass>--><!--</manifest>--><!--</archive>--><!--</configuration>--><!--</plugin>--><plugin><artifactId>maven-assembly-plugin</artifactId><version>3.1.0</version><configuration><descriptorRefs><descriptorRef>jar-with-dependencies</descriptorRef></descriptorRefs></configuration><executions><execution><id>make-assembly</id> <!-- this is used for inheritance merges --><phase>package</phase> <!-- bind to the packaging phase --><goals><goal>single</goal></goals></execution></executions></plugin><!--<plugin>--><!--<groupId>org.springframework.boot</groupId>--><!--<artifactId>spring-boot-maven-plugin</artifactId>--><!--</plugin>--></plugins></build></project>

执行mvn package

D:\E\workspaceGitub\springboot\MavenPluginDemo>mvn package
[INFO] Scanning for projects...
[INFO]
[INFO] -----------------------< com.yq:MavenPluginDemo >-----------------------
[INFO] Building MavenPluginDemo 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-resources-plugin:3.0.1:resources (default-resources) @ MavenPluginDemo ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.7.0:compile (default-compile) @ MavenPluginDemo ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 4 source files to D:\E\workspaceGitub\springboot\MavenPluginDemo\target\classes
[INFO]
[INFO] --- maven-resources-plugin:3.0.1:testResources (default-testResources) @ MavenPluginDemo ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory D:\E\workspaceGitub\springboot\MavenPluginDemo\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.7.0:testCompile (default-testCompile) @ MavenPluginDemo ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-surefire-plugin:2.20.1:test (default-test) @ MavenPluginDemo ---
[INFO] No tests to run.
[INFO]
[INFO] --- maven-jar-plugin:3.0.2:jar (default-jar) @ MavenPluginDemo ---
[INFO] Building jar: D:\E\workspaceGitub\springboot\MavenPluginDemo\target\MavenPluginDemo-1.0-SNAPSHOT.jar
[INFO]
[INFO] --- maven-assembly-plugin:3.1.0:single (make-assembly) @ MavenPluginDemo ---
[INFO] Building jar: D:\E\workspaceGitub\springboot\MavenPluginDemo\target\MavenPluginDemo-1.0-SNAPSHOT-jar-with-dependencies.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 13.613 s
[INFO] Finished at: 2018-08-19T19:45:56+08:00
[INFO] ------------------------------------------------------------------------D:\E\workspaceGitub\springboot\MavenPluginDemo>

此时执行>java -jar MavenPluginDemo-1.0-SNAPSHOT-jar-with-dependencies.jar
会报错误：MavenPluginDemo-1.0-SNAPSHOT-jar-with-dependencies.jar中没有主清单属性

修改pom文件中maven-assembly-plugin的设置

            <plugin><artifactId>maven-assembly-plugin</artifactId><version>3.1.0</version><configuration><archive><manifest><addClasspath>true</addClasspath><classpathPrefix>lib/</classpathPrefix><mainClass>com.yq.WebUserApplication</mainClass></manifest></archive><descriptorRefs><descriptorRef>jar-with-dependencies</descriptorRef></descriptorRefs></configuration><executions><execution><id>make-assembly</id> <!-- this is used for inheritance merges --><phase>package</phase> <!-- bind to the packaging phase --><goals><goal>single</goal></goals></execution></executions></plugin>

注意： **

非常重要。

**
本文示例代码是个spring boot工程，因此一般使用spring-boot-maven-plugin最适合。

            <plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin>

关于spring-boot-maven-plugin请参考https://docs.spring.io/spring-boot/docs/current/reference/html/build-tool-plugins-maven-plugin.html

本文使用了maven-assembly-plugin，生成的jar启动时报如下错误。导致项目无法正常运行（这是因为我们的项目是springboot的项目，如果是普通的以main函数所在类启动的，不涉及springboot特有东西的不会出现如下错误）
Caused by: java.lang.IllegalArgumentException: No auto configuration classes found in META-INF/spring.factories. If you are using a custom packaging, make sure that file is correct.
at org.springframework.util.Assert.notEmpty(Assert.java:450) ~[MavenPluginDemo-1.0-SNAPSHOT-jar-with-dependencies.jar:na]