使用maven把一个java项目打成可以用java -jar命令执行的jar ，需要配置的pom文件内容如下

<?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>cn.xxxx.demo</groupId><artifactId>RpcServer</artifactId><version>1.0-SNAPSHOT</version>
<!-- 配置打jar包 --><packaging>jar</packaging><!-- 声明本项目使用的java版本和字符编码 -->  <properties><java.version>1.8</java.version><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding></properties><dependencies><dependency><groupId>com.thoughtworks.xstream</groupId><artifactId>xstream</artifactId><version>1.4.10</version></dependency><dependency><groupId>io.netty</groupId><artifactId>netty-all</artifactId><version>4.1.50.Final</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.16</version></dependency></dependencies><build><plugins><!-- 配置maven编译使用的java版本和字符编码 --> <plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><configuration><source>8</source><target>8</target><encoding>UTF-8</encoding></configuration></plugin><!-- 配置jar包启动的主类以及依赖的classpath路径 --><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-jar-plugin</artifactId><configuration><archive><manifest><mainClass>cn.xxxx.demo.Provider</mainClass><addClasspath>true</addClasspath><useUniqueVersions>false</useUniqueVersions><classpathPrefix>lib/</classpathPrefix></manifest><manifestEntries><Class-Path>.</Class-Path></manifestEntries></archive></configuration></plugin><!-- 配置将app依赖的第三方jar包，copy到本项目最终生成jar包目录里的lib文件夹里 --><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-dependency-plugin</artifactId><executions><execution><id>copy-dependencies</id><phase>package</phase><goals><goal>copy-dependencies</goal></goals><configuration><type>jar</type><includeTypes>jar</includeTypes><outputDirectory>${project.build.directory}/lib</outputDirectory></configuration></execution></executions></plugin></plugins></build>
</project>