用Maven快速生成帶有依賴的可執行jar包

時間 2019-11-11

標籤 maven 快速生成帶有依賴可執行 jar 欄目 Maven 简体版

原文原文鏈接

1、背景

　　最近項目在作微服務的拆分，那麼咱們想讓咱們的容器啓動更加的輕量級，因此咱們選擇放棄tomcat等容器，而是經過maven生成帶有指定依賴的可執行jar包的方式進行處理，本文我將分享如何經過maven的maven-jar-plugin打包插件來進行生成目的可jar包。java

2、原理以及實現步驟

1.原理git

　　咱們能夠經過修改maven 打jar包的maven-jar-plugin插件的配置信息來生成咱們須要的指定依賴的可執行jar包。github

2.步驟：在項目的pom.xml文件中修改默認的jar插件spring

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <version>2.3.1</version>
            <configuration>
                <archive>
                    <manifest>
                        <!--運行jar包時運行的主類，要求類全名-->
                        <mainClass>com.hafiz.Runner</mainClass>
                        <!-- 是否指定項目classpath下的依賴 -->
                        <addClasspath>true</addClasspath>
                        <!-- 指定依賴的時候聲明前綴 -->
                        <classpathPrefix>./lib/</classpathPrefix>
                        <!--依賴是否使用帶有時間戳的惟一版本號,如:xxx-1.3.0-20121225.012733.jar-->
                        <useUniqueVersions>false</useUniqueVersions>
                    </manifest>
                </archive>
            </configuration>
        </plugin>
    </plugins>
</build>

接着咱們還要配置maven的maven-dependency-plugin插件把當前項目的全部依賴放到target目錄下的lib文件夾下express

 1 <plugin>
 2    <groupId>org.apache.maven.plugins</groupId>
 3    <artifactId>maven-dependency-plugin</artifactId>
 4    <executions>
 5       <execution>
 6         <id>copy</id>
 7         <phase>package</phase>
 8         <goals>
 9            <goal>copy-dependencies</goal>
10         </goals>
11         <configuration>
12            <outputDirectory>${project.build.directory}/lib</outputDirectory>
13         </configuration>
14      </execution>
15    </executions>
16 </plugin>

其中，${project.build.directory}表示默認的target文件夾。apache

咱們經過上文的修改便完成了適用maven生成指定依賴的可執行jar包。tomcat

咱們發現生成的manifest文件中已經設置好了Main-Class以及Class-Path，以下：app

若是<addClasspath>設置爲false,則生成的manifest文件中不會聲明依賴(即不會有Class-Path聲明)maven

3.主類微服務

package com.hafiz;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Desc:主類
 * Created by hafiz.zhang on 2018/4/07.
 */
public class Runner {
    public static void main(String[] args) {
        ApplicationContext context 
　　　　　　　　= new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
        System.out.println("context:" + context.getClass());
        System.out.println("The Main Class Is Running....");
    }
}

4.pom.xml

<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.hafiz</groupId>
    <artifactId>assembly-demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>assembly-demo</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <spring.version>4.2.6.RELEASE</spring.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>2.3.1</version>
                <configuration>
                    <archive>
                        <manifest>
                            <!--運行jar包時運行的主類，要求類全名-->
                            <mainClass>com.hafiz.Runner</mainClass>
                            <!-- 是否指定項目classpath下的依賴 -->
                            <addClasspath>true</addClasspath>
                            <!-- 指定依賴的時候聲明前綴 -->
                            <classpathPrefix>./lib/</classpathPrefix>
                            <!--依賴是否使用帶有時間戳的惟一版本號,如:xxx-1.3.0-20121225.012733.jar-->
                            <useUniqueVersions>false</useUniqueVersions>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
            <!--把當前項目全部的依賴打包到target目錄下的lib文件夾下-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <executions>
                    <execution>
                        <id>copy</id>
                        <phase>package</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${project.build.directory}/lib</outputDirectory>
                            <!--已存在的Release版本不重複copy-->
                            <overWriteReleases>false</overWriteReleases>
                            <!--已存在的SnapShot版本不重複copy-->
                            <overWriteSnapshots>false</overWriteSnapshots>
                            <!--不存在或者有更新版本的依賴才copy-->
                            <overWriteIfNewer>true</overWriteIfNewer>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>