添加Main-Class到manifest中

Maven默认打包生成的jar是不能够直接运行的，因为带有main方法的类信息不会添加到manifest中（打开jar文件中的META-INF/MANIFEST.MF文件，将无法看到Main-Class一行）。为了生成可执行的jar文件，需要借组maven-shade-plugin，配置该插件如下：

<?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/maven-v4_0_0.xsd">

	<modelVersion>4.0.0</modelVersion>

	<groupId>cn.xianshiyouhui.mvntest</groupId>

	<artifactId>hello-world</artifactId>

	<version>1.0-SNAPSHOT</version>

	<name>Maven Hello World Project</name>

	<dependencies>

		<dependency>

			<groupId>junit</groupId>

			<artifactId>junit</artifactId>

			<version>4.11</version>

			<scope>test</scope>

		</dependency>

	</dependencies>

	<build>

		<plugins>

			<plugin>

				<groupId>org.apache.maven.plugins</groupId>

				<artifactId>maven-shade-plugin</artifactId>

				<version>2.3</version>

				<configuration>

					<transformers>

						<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">

							<mainClass>cn.xianshiyouhui.mvnbook.helloworld.HelloWorld</mainClass>

						</transformer>

					</transformers>

				</configuration>

				<executions>

					<execution>

						<phase>package</phase>

						<goals>

							<goal>shade</goal>

						</goals>

					</execution>

				</executions>

			</plugin>

		</plugins>

	</build>

</project>