springboot打包成可执行Jar文件教程

Myth丶恋晨 2022-09-29 02:01 41阅读 0赞

我们在开发springboot项目时，通常都是在IDE环境里执行main函数启动应用，但是当我们开发完毕需要部署项目时，就需要把项目工程打成能够独立运行的jar文件。

把工程项目打成可执行的jar文件，需要maven-jar-plugin这个插件，并且需要配置<mainClass>指定项目的main方法所在的类；通过maven-jar-plugin打成Jar包后其实运行会

报错，例如：”Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication“，因为还没有把依赖的class文件打包到jar执行环境，因此，需要maven-dependency-plugin把依赖文件一同打包输出到执行环境。具体的maven-jar-plugin和maven-dependency-plugin配置如下图：

<plugin>   
            <groupId>org.apache.maven.plugins</groupId>   
            <artifactId>maven-jar-plugin</artifactId>   
            <version>2.3.2</version>   
            <configuration>   
                <archive>   
                    <manifest>   
                           
                        <addClasspath>true</addClasspath>   
                        <classpathPrefix>lib/</classpathPrefix>   
                        <mainClass>com.panminlan.Application</mainClass>   
                        <addDefaultImplementationEntries>true</addDefaultImplementationEntries>   
                        <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>   
                    </manifest>   
                    <manifestEntries>   
                        <Permissions>$\{Permissions\}</Permissions>   
                        <Caller-Allowable-Codebase>$\{Caller-Allowable-Codebase\}</Caller-Allowable-Codebase>   
                    </manifestEntries>   
                </archive>   
            </configuration>   
        </plugin>   
        <plugin>   
            <groupId>org.apache.maven.plugins</groupId>   
            <artifactId>maven-dependency-plugin</artifactId>   
            <version>2.3</version>   
            <executions>   
                <execution>   
                    <id>copy-dependencies</id>   
                    <phase>package</phase>   
                    <configuration>   
                        <overWriteReleases>false</overWriteReleases>   
                        <overWriteSnapshots>false</overWriteSnapshots>   
                        <overWriteIfNewer>true</overWriteIfNewer>   
                        <outputDirectory>   
                          $\{project.build.directory\}/lib  
                        </outputDirectory>   
                    </configuration>   
                    <goals>   
                        <goal>copy-dependencies</goal>   
                    </goals>   
                </execution>   
            </executions>   
        </plugin>