Springboot、maven 打包瘦身，去除依赖的jar【springboot外置jar、配置文件】

背景

分布式项目、微服务项目一般都会引用许多公共依赖，每次maven打出来的jar包上百M，不利于运维工作、可以在打包时隔离项目本身的jar和依赖的公用jar包，这样项目本身包可以做到很精简。

本文主要把项目依赖的包和项目的配置文件在打包时导出到本身springboot 的jar包 外。

本文项目中导入依赖用到了两种方式，一是直接通过maven库，二是通过导入本地第三方jar

配置

全部配置

我在系统根目录下创建了一个boot的文件夹，mvn打包之后会在boot下创建名称为lib、boot-demo的两个文件夹，lib用来存放所有依赖的jar，boot-demo用来存放springboot的jar和application.properties配置文件 

用到了

maven-compiler-plugin：负责编译源码

spring-boot-maven-plugin ：负责编译springbootjar

maven-jar-plugin：负责把项目依赖的jar写到MANIFEST.MF文件

maven-dependency-plugin：负责导出项目依赖的jar

maven-resources-plugin：负责导出项目配置文件

<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>4.0.0modelVersion>
 
    <groupId>com.luckgroupId>
    <artifactId>boot-demoartifactId>
    <version>1.0-SNAPSHOTversion>
 
    <name>boot-demoname>
 
    <properties>
        <global-jar-output>/bootglobal-jar-output>
        
        <system-jar-classpath>. ../lib/mytest-1.0.jarsystem-jar-classpath>
        <java.home>${env.JAVA_HOME}java.home>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
        <java.version>1.8java.version>
    properties>
 
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-dependenciesartifactId>
                <version>2.3.0.RELEASEversion>
                <type>pomtype>
                <scope>importscope>
            dependency>
        dependencies>
    dependencyManagement>
 
    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        
        <dependency>
            <groupId>com.luckgroupId>
            <artifactId>mytestartifactId>
            <version>1.0version>
            <scope>systemscope>
            <systemPath>${basedir}/lib/otherjar.jarsystemPath>
        dependency>
    dependencies>
    <build>
        <resources>
            <resource>
                <directory>src/main/javadirectory>
                <includes>
                    <include>**/*.xmlinclude>
                includes>
            resource>
            <resource>
                <directory>src/main/resourcesdirectory>
                <includes>
                    <include>**/*.*include>
                includes>
                
                <excludes>
                    <exclude>*.propertiesexclude>
                excludes>
            resource>
            <resource>
                <directory>src/main/${package.environment}directory>
                <includes>
                    <include>**/*.*include>
                includes>
                <excludes>
                    <exclude>*.propertiesexclude>
                excludes>
                <targetPath>${project.basedir}/target/classestargetPath>
                <filtering>truefiltering>
            resource>
        resources>
        <plugins>
            
            <plugin>
                <groupId>org.apache.maven.pluginsgroupId>
                <artifactId>maven-compiler-pluginartifactId>
                <version>3.1version>
                <configuration>
                    <source>1.8source>
                    <target>1.8target>
                    <encoding>UTF8encoding>
                    <compilerArguments>
                        <bootclasspath>${java.home}\jre\lib\rt.jar;${java.home}\jre\lib\jce.jarbootclasspath>
                    compilerArguments>
                configuration>
            plugin>
            
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
                <configuration>
                    
                    <mainClass>com.luck.MainApplicationmainClass>
                    
                    <layout>ZIPlayout>
                    
                    <includes>
                         <include>
                             <groupId>nojargroupId>
                             <artifactId>nojarartifactId>
                         include>
                    includes>
                    
                    <outputDirectory>${global-jar-output}/${project.artifactId}outputDirectory>
                configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackagegoal>
                        goals>
                    execution>
                executions>
            plugin>
            <plugin>
                <groupId>org.apache.maven.pluginsgroupId>
                <artifactId>maven-jar-pluginartifactId>
                <configuration>
                    <archive>
                        
                        <manifest>
                            <addClasspath>trueaddClasspath>
                            <classpathPrefix>../lib/classpathPrefix>
                            <useUniqueVersions>falseuseUniqueVersions>
                        manifest>
                        
                        <manifestEntries>
                            <Class-Path>${system-jar-classpath}Class-Path>
                        manifestEntries>
                    archive>
                configuration>
            plugin>
            
            <plugin>
                <groupId>org.apache.maven.pluginsgroupId>
                <artifactId>maven-dependency-pluginartifactId>
                <executions>
                    <execution>
                        <id>copy-libid>
                        <phase>packagephase>
                        <goals>
                            <goal>copy-dependenciesgoal>
                        goals>
                    execution>
                executions>
                 <configuration>
                     <outputDirectory>${global-jar-output}/liboutputDirectory>
                     <excludeTransitive>falseexcludeTransitive>
                     <stripVersion>falsestripVersion>
                     <silent>falsesilent>
                 configuration>
            plugin>
            
            <plugin>
                <groupId>org.apache.maven.pluginsgroupId>
                <artifactId>maven-resources-pluginartifactId>
                <executions>
                    <execution>
                        <id>copy-configid>
                        <phase>packagephase>
                        <goals>
                            <goal>copy-resourcesgoal>
                        goals>
                        <configuration>
                            <resources>
                                <resource>
                                    <directory>src/main/resourcesdirectory>
                                    <includes>
                                        <include>*.propertiesinclude>
                                    includes>
                                resource>
                            resources>
                            <outputDirectory>${global-jar-output}/${project.artifactId}outputDirectory>
                        configuration>
                    execution>
                executions>
            plugin>
        plugins>
    build>
 
    <profiles>
        <profile>
            <id>testid>
            <properties>
                <package.environment>res-testpackage.environment>
            properties>
        profile>
        <profile>
            <id>devid>
            <activation>
                <activeByDefault>trueactiveByDefault>
            activation>
            <properties>
                <package.environment>resourcespackage.environment>
            properties>
        profile>
    profiles>
project>

生成 

 

 

 

 

 

 

Java中读取application.properties文件

java读取外部配置文件需要用到

org.springframework.core.io.ClassPathResource.ClassPathResource这个类

InputStream in = new ClassPathResource("application.properties").getInputStream()

参考文章

SpringBoot 部署 Jar 文件，瘦身优化指南 ！ - 知乎