Maven打包时指定启动类

朱雀 2022-04-25 10:26 1246阅读 0赞

使用Maven打包的时候, 有时候需要指定启动类, 可如下操作!

测试项目(结构如下):

![20190531144015145.png][]

代码: com.xxx.MainClass.java

--------------------

package com.xxx;
    
    public class MainClass {
        public static void main(String[] args) {
            System.out.println("The project is to use maven to package a Jar with mainclass !");
        }
    }

--------------------

打包的时候指定启动类为 com.xxx.MainClass

方法一:

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>com.xxx</groupId>
        <artifactId>maven-packaging</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <build>
            
            <finalName>MainClass</finalName>
            <plugins>
                
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <target>1.8</target>
                        <source>1.8</source>
                    </configuration>
                </plugin>
    
                
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-shade-plugin</artifactId>
                    <version>3.2.1</version>
                    <executions>
                        <execution>
                            <phase>package</phase>
                            <goals>
                                <goal>shade</goal>
                            </goals>
                            <configuration>
                                <transformers>
                                    <transformer
                                            implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                        <mainClass>com.xxx.MainClass</mainClass>
                                    </transformer>
                                </transformers>
                            </configuration>
                        </execution>
                    </executions>
                </plugin>
            </plugins>
        </build>
    </project>

--------------------

执行 mvn clean package , 在target包下找到MainClass.jar文件

可直接使用命令 java -jar MainClass.jar 执行

![20190531144401818.png][]

方法二:

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>com.xxx</groupId>
        <artifactId>maven-packaging</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <build>
            
            <finalName>MainClass</finalName>
            <plugins>
                
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <target>1.8</target>
                        <source>1.8</source>
                    </configuration>
                </plugin>
            </plugins>
            
            <pluginManagement>
                <plugins>
                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-jar-plugin</artifactId>
                        <configuration>
                            <archive>
                                <manifest>
                                    <mainClass>com.xxx.MainClass</mainClass>
                                    <addClasspath>true</addClasspath>
                                    <classpathPrefix>lib/</classpathPrefix>
                                </manifest>
                            </archive>
                            <classesDirectory>
                            </classesDirectory>
                        </configuration>
                    </plugin>
                </plugins>
            </pluginManagement>
        </build>
    </project>

--------------------

执行 mvn clean package , 在target包下找到MainClass.jar文件

可直接使用命令 java -jar MainClass.jar 执行

![20190531144713395.png][]

两种配置效果时一样的 !!!!!

[20190531144015145.png]: /images/20220125/a5483a5dcb05434d97fd2662ad670bc9.png
[20190531144401818.png]: /images/20220125/6971479096694e28badd40a14e30fe98.png
[20190531144713395.png]: /images/20220125/c99f6a3e22a04e1b89e4436b809a865b.png