環境准備：
jdk 1.8
maven 3.6
springboot 2.2.2.RELEASE
為什么要分離打包
我們在使用maven為springboot項目打包時會發現打完的jar包會很大，而實際上里面絕大部分的大文件為靜態資源和第三方依賴的jar包，而動輒百兆的jar包每次發布時候就很頭痛了，上傳服務器時由於帶寬的限制每次都非常慢，其次如果只需要改靜態文件，但還得重新打包發布並重啟，很是麻煩，所以分離打包主要是為了解決2個痛點：
- 發布時上傳時間太久
- 修改靜態文件不用重啟服務
Talk is cheap. Show me the code!
pom.xml
<build>
<finalName>${project.artifactId}-${profiles.active}</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
<includes>
<include>application.yml</include>
<include>application-${profiles.active}.yml</include>
</includes>
</resource>
<resource>
<directory>src/main/resources</directory>
<filtering>false</filtering>
<includes>
<include>templates/**</include>
<include>static/**</include>
<include>mapper/**</include>
<include>freemark/**</include>
<include>spy.properties</include>
</includes>
</resource>
</resources>
<plugins>
<!-- 分離打包開始 -->
<!-- 跳過測試代碼 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<skipTests>true</skipTests>
</configuration>
</plugin>
<!-- maven打包成jar的插件 -->
<!-- 打包jar文件時，配置manifest文件，加入lib包的jar依賴 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<!-- 把target/classes/下的文件導入到jar內 -->
<classesDirectory>target/classes/</classesDirectory>
<finalName>${project.artifactId}-${project.version}</finalName>
<archive>
<manifest>
<!-- 指定程序入口 -->
<mainClass>com.jingci.erp.ErpApplication</mainClass>
<!-- 打包時 MANIFEST.MF文件不記錄的時間戳版本 -->
<useUniqueVersions>false</useUniqueVersions>
<addClasspath>true</addClasspath>
<!-- 服務依賴的jar包放在lib目錄下 -->
<classpathPrefix>lib/</classpathPrefix>
<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
</manifest>
<manifestEntries>
<!--MANIFEST.MF 中 Class-Path 加入資源文件目錄 -->
<Class-Path>./resources/</Class-Path>
</manifestEntries>
</archive>
<!-- jar包中不包括以下文件 -->
<excludes>
<exclude>mapper/**</exclude>
<exclude>static/**</exclude>
<exclude>templates/**</exclude>
<exclude>**/*.yml</exclude>
<exclude>**/*.xml</exclude>
<exclude>**/*.properties</exclude>
</excludes>
<outputDirectory>${project.build.directory}</outputDirectory>
</configuration>
</plugin>
<!-- 分離打包關鍵代碼 maven-dependency-plugin -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<type>jar</type>
<includeTypes>jar</includeTypes>
<!-- 存放服務依賴的jar包，存放在服務相同目錄的lib文件夾下 -->
<outputDirectory>
${project.build.directory}/lib
</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<!-- 分離打包關鍵代碼 maven-resources-plugin -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<executions>
<execution>
<id>copy-resources</id>
<phase>package</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<!-- 指定resources文件 -->
<resources>
<resource>
<directory>src/main/resources</directory>
<!-- 分環境過濾開啟 -->
<filtering>true</filtering>
<includes>
<include>application.yml</include>
<!-- 分環境配置文件不用可刪除 -->
<!-- <include>application-${profiles.active}.yml</include> -->
</includes>
</resource>
<resource>
<directory>src/main/resources</directory>
<!-- 分環境過濾關閉 -->
<filtering>false</filtering>
<includes>
<include>templates/**</include>
<include>static/**</include>
<include>mapper/**</include>
<include>freemark/**</include>
<include>spy.properties</include>
</includes>
</resource>
</resources>
<!-- 輸出路徑 -->
<outputDirectory>${project.build.directory}/resources</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<!-- 分離打包結束 -->
</plugins>
</build>
打包
然后執行
mvn clean package
等打包結束就可以看到項目根目錄下的target文件夾的結構如下
啟動測試
隨后就可以將lib、resources、xxx.jar這三個文件夾發布到服務器上，定位到指定目錄后執行
java -jar xxx.jar
便可啟動項目
后續維護
至此分離打包結束、以后項目發布過程中，在第三方jar包或靜態資源沒有變化的情況下可以只發布項目源代碼jar包，以節省發布時間提高效率