如果使用Maven打包成一个完整可执行的Jar包

原文链接：https://blog.dubby.cn/detail.html?id=9083

Maven提供了这么一个plugin，Apache Maven Shade Plugin。他的作用就是用来打包一个超级Jar包（被称作uber-jar），其中包含了他依赖的其他Jar包。

使用也是非常简单：

pom.xml:

<?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.dubby</groupId>
<artifactId>undertow-demo</artifactId>
<version>1.0</version>
<packaging>jar</packaging>

<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<undertow.version>1.4.21.Final</undertow.version>
</properties>

<dependencies>
<dependency>
<groupId>io.undertow</groupId>
<artifactId>undertow-core</artifactId>
<version>${undertow.version}</version>
</dependency>
<dependency>
<groupId>io.undertow</groupId>
<artifactId>undertow-servlet</artifactId>
<version>${undertow.version}</version>
</dependency>
<dependency>
<groupId>io.undertow</groupId>
<artifactId>undertow-websockets-jsr</artifactId>
<version>${undertow.version}</version>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.1.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>cn.dubby.undertow.demo.HelloWorldServer</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>

</project>

关键的就是：

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.1.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>cn.dubby.undertow.demo.HelloWorldServer</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>

package cn.dubby.undertow.demo;

import io.undertow.Undertow;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.Headers;

/**
 * Created by yangzheng03 on 2018/1/4.
 */
public class HelloWorldServer {

public static void main(final String[] args) {
        Undertow server = Undertow.builder()
                .addHttpListener(8080, "localhost")
                .setHandler(new HttpHandler() {
@Override
public void handleRequest(final HttpServerExchange exchange) throws Exception {
                        exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
                        exchange.getResponseSender().send("Hello World");
                    }
                }).build();
        server.start();
    }
}

因为这个plugin的goal绑定在package阶段，所以直接执行mvn package，然后cd进target目录，执行：

➜  target java -jar undertow-demo-1.0.jar         
一月 04, 2018 1:40:18 下午 org.xnio.Xnio <clinit>
INFO: XNIO version 3.3.8.Final
一月 04, 2018 1:40:18 下午 org.xnio.nio.NioXnio <clinit>
INFO: XNIO NIO Implementation Version 3.3.8.Final

就可以直接执行了~