Maven多模块项目构建及模块打包
上一篇SpringCloud之天气预报微服务学习案例中，使用idea用maven进行项目管理，多模块构建公共api模块、微服务模块，开发过程中多有采坑，特别是微服务模块进行单独打jar包的时候开始始终没有成功，这里以天气预报微服务案例进行项目搭建，方便大家参考。
项目环境
- IDEA IntelliJ IDEA 2017.1.3
- Maven-3.5
构建步骤
- 创建父工程，步骤如下图顺序
父工程创建完成，进行pom文件配置
<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.weather.springcloudgroupId>
<artifactId>springcloud_weatherartifactId>
<packaging>pompackaging>
<version>1.0-SNAPSHOTversion>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
<maven.compiler.encoding>UTF-8maven.compiler.encoding>
<java.version>1.8java.version>
<maven.compiler.source>1.8maven.compiler.source>
<maven.compiler.target>1.8maven.compiler.target>
<junit.version>4.12junit.version>
properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-dependenciesartifactId>
<version>Greenwich.SR2version>
<type>pomtype>
<scope>importscope>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-parentartifactId>
<version>2.1.7.RELEASEversion>
<type>pomtype>
<scope>importscope>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>springloadedartifactId>
<version>1.2.8.RELEASEversion>
<scope>providedscope>
dependency>
dependencies>
dependencyManagement>
project>
- 创建Module
按照上面步骤，依次创建所需模块
创建完成后，父工程pom.xml文件中会多出如下代码
<modules>
<module>weather_apimodule>
<module>eureka_server_7201module>
<module>weather_city_server_8001module>
<module>weather_collection_server_8201module>
<module>weather_data_server_8401module>
<module>weather_report_server_8601module>
modules>
打开Maven Projects效果
- weather_api为公共模块api，项目中引用公共模块
父工程pom文件引入
<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.weather.springcloudgroupId>
<artifactId>springcloud_weatherartifactId>
<packaging>pompackaging>
<version>1.0-SNAPSHOTversion>
<modules>
<module>weather_apimodule>
<module>eureka_server_7201module>
<module>weather_city_server_8001module>
<module>weather_collection_server_8201module>
<module>weather_data_server_8401module>
<module>weather_report_server_8601module>
modules>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
<maven.compiler.encoding>UTF-8maven.compiler.encoding>
<java.version>1.8java.version>
<maven.compiler.source>1.8maven.compiler.source>
<maven.compiler.target>1.8maven.compiler.target>
<junit.version>4.12junit.version>
properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-dependenciesartifactId>
<version>Greenwich.SR2version>
<type>pomtype>
<scope>importscope>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-parentartifactId>
<version>2.1.7.RELEASEversion>
<type>pomtype>
<scope>importscope>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>springloadedartifactId>
<version>1.2.8.RELEASEversion>
<scope>providedscope>
dependency>
<dependency>
<groupId>com.weather.springcloudgroupId>
<artifactId>weather_apiartifactId>
<version>${project.version}version>
dependency>
dependencies>
dependencyManagement>
project>
其它模块pom文件引入，以weather_city_server_8001为例，其它都一样
<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">
<parent>
<artifactId>springcloud_weatherartifactId>
<groupId>com.weather.springcloudgroupId>
<version>1.0-SNAPSHOTversion>
parent>
<modelVersion>4.0.0modelVersion>
<artifactId>weather_city_server_8001artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
dependency>
<dependency>
<groupId>com.weather.springcloudgroupId>
<artifactId>weather_apiartifactId>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>springloadedartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-devtoolsartifactId>
dependency>
dependencies>
project>
- 为需要打可执行jar包的模块pom文件增加build配置和插件
模块pom文件增加build配置，以weather_city_server_8001为例，其它都一样
<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">
<parent>
<artifactId>springcloud_weatherartifactId>
<groupId>com.weather.springcloudgroupId>
<version>1.0-SNAPSHOTversion>
parent>
<modelVersion>4.0.0modelVersion>
<artifactId>weather_city_server_8001artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
dependency>
<dependency>
<groupId>com.weather.springcloudgroupId>
<artifactId>weather_apiartifactId>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>springloadedartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-devtoolsartifactId>
dependency>
dependencies>
<build>
<finalName>city_server_8001finalName>
<resources>
<resource>
<directory>src/main/javadirectory>
<includes>
<include>**/*.xmlinclude>
includes>
resource>
<resource>
<directory>src/main/resourcesdirectory>
<includes>
<include>**.*include>
<include>**/*.*include>
<include>**/*/*.*include>
includes>
resource>
<resource>
<directory>src/main/resourcesdirectory>
<filtering>truefiltering>
resource>
resources>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
<configuration>
<fork>truefork>
<mainClass>com.weather.springcloud.city.WeatherCityServer8001_AppmainClass>
<layout>ZIPlayout>
configuration>
<executions>
<execution>
<goals>
<goal>repackagegoal>
goals>
execution>
executions>
plugin>
plugins>
build>
project>
- 编译工程，安装所有模块jar包至maven仓库
到此，所有工作步骤完成，即可运行所生成的jar包，然后单一模块想打 jar 包都不会有问题，如果不进行最后 5 这个流程，在打单一 jar 时候很可能会报如下异常，我之前做项目就是卡在此处，只能在idea进行运行，无法把模块进行打jar包出来进行运行。异常信息如下：
[ERROR] Failed to execute goal on project weather_collection_server_8001: Could not resolve dependencies for project com.weather.springcloud:weather_collection_server_8001:jar:1.0-SNAPSHOT: Failed to collect dependencies at com.weather.springcloud:weather_api:jar:1.0-SNAPSHOT: Failed to read artifact descriptor for com.weather.springcloud:weather_api:jar:1.0-SNAPSHOT: Could not find artifact com.weather.springcloud:springcloud_weather:pom:1.0-SNAPSHOT -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
demo源码下载