【掘金者说】Springboot工程减肥瘦身处理,从21.1MB变成5.17KB

今天，掘金者说把原先的一个小小的功能整理出来分享，一个不起眼而且大家都会使用的功能。在当时的二月份疫情开发健康信息上报采集的时候，这个maven打包功能是很实用的。

SpringBoot部署起来就是方便，一个jar包启动即可。暂时不考虑在容器云中，只是一个单机或者集群部署，那么每次打包上传jar包，就需要上传更新。作为业务代码调整，有时候我们就改了一个类而已，却要重新打整个包。那重新打包几十兆进行上传，在内网或者网络慢的情况下，传输就比较耗费时间。所以，我们可以进行瘦瘦处理，部分依赖的包放置在外面，每次打包就只要几十KB即可。

注意:当你引入外部的开源依赖包，就需要重新打包lib进行替换，这样避免更新时候启动找不到实体类的异常。

然后，我们新建一个简单的springboot工程来体验一下吧！

新建工程，编译后：

    <!-- 原有工程 -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

进行调整后，如同前端的vue进行build的包进行拷贝即可。如下：

 <!-- 为了笔记浅显易懂 maven和启动脚本忽略 可以自己编写-->
 <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.yml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>*.properties</exclude>
                        <exclude>*.yml</exclude>
                    </excludes>
                    <archive>
                        <manifest>
                            <mainClass>com.pig4cloud.slimming.PigSlimmingApplication</mainClass>
                            <addClasspath>true</addClasspath>
                            <classpathPrefix>lib/</classpathPrefix>
                            <useUniqueVersions>false</useUniqueVersions>
                        </manifest>
                        <manifestEntries>
                            <Class-Path>conf/</Class-Path>
                        </manifestEntries>
                    </archive>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-resources-plugin</artifactId>
                <executions>
                    <execution>
                        <id>copy-xmls</id>
                        <phase>process-sources</phase>
                        <goals>
                            <goal>copy-resources</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${package.path}/conf</outputDirectory>
                            <overwrite>true</overwrite>
                            <resources>
                                <resource>
                                    <directory>${basedir}/src/main/resources</directory>
                                    <includes>
                                        <include>*.properties</include>
                                        <include>*.yml</include>
                                    </includes>
                                </resource>
                            </resources>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <executions>
                    <execution>
                        <id>copy-artifact</id>
                        <phase>package</phase>
                        <goals>
                            <goal>copy</goal>
                        </goals>
                        <configuration>
                            <artifactItems>
                                <artifactItem>
                                    <groupId>${project.groupId}</groupId>
                                    <artifactId>${project.artifactId}</artifactId>
                                    <version>${project.version}</version>
                                    <type>${project.packaging}</type>
                                </artifactItem>
                            </artifactItems>
                            <outputDirectory>${package.path}/</outputDirectory>
                        </configuration>
                    </execution>
                    <execution>
                        <id>copy</id>
                        <phase>package</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${package.path}/lib/</outputDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

部署上去后，进行调整后期都是打几十KB包即可。

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>*.properties</exclude>
                        <exclude>*.yml</exclude>
                    </excludes>
                    <archive>
                        <manifest>
                            <mainClass>com.pig4cloud.slimming.PigSlimmingApplication</mainClass>
                            <addClasspath>true</addClasspath>
                            <classpathPrefix>lib/</classpathPrefix>
                            <useUniqueVersions>false</useUniqueVersions>
                        </manifest>
                        <manifestEntries>
                            <Class-Path>conf/</Class-Path>
                        </manifestEntries>
                    </archive>
                </configuration>
            </plugin>
        </plugins>
    </build>