Spring Boot服務構建、模塊拆分及Profile集成

項目搭建步驟

1、新建project（使用IDEA JDK8）

2、修改默認的Group Artifact

3、選擇需要的依賴jar包等 如lombok及其他需要的組件等（也可後續自己在pom.xml添加）

4、創建後的文件結構（手動刪除了.mvn目錄、mvnw等）後如下：

可運行DemoApplication.java查看是否運行成功並結束（此時使用的jar包爲spring-boot-starter，所以項目不是spring web項目，只是構建了一個spring項目，若期望構建spring web項目，只需要把上圖pom中的spring-boot-starter修改爲spring-boot-starter-web即可）

Module拆分

1、右鍵demo項目，新建demo-service module

2、選擇依賴模塊後，確定模塊名稱

3、同樣的步驟創建demo-common module，demo-web module。
全部創建完畢後目錄如下，手動刪除最初創建的demo工程根目錄的java/test文件，外層目錄只保留pom.xml統一工程使用的jar包版本。（當然，根目錄pom.xml通常也會定義maven地址、build方式、profile配置等）

修正完畢後的目錄如下，運行DemoWebApplication.java可正常啓動web應用

具體pom內容如下：

根pom（demo/pom.xml）

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.0.RELEASE</version>
        <relativePath/>
    </parent>

    <groupId>com.springboot.demo</groupId>
    <artifactId>demo</artifactId>
    <packaging>pom</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <demo.version>0.0.1-SNAPSHOT</demo.version>
        <springboot.version>2.2.0.RELEASE</springboot.version>
        <lombok.version>1.18.8</lombok.version>
    </properties>

    <modules>
        <module>demo-common</module>
        <module>demo-service</module>
        <module>demo-web</module>
    </modules>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
                <version>${springboot.version}</version>
            </dependency>

            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
                <version>${springboot.version}</version>
            </dependency>

            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <version>${springboot.version}</version>
                <scope>test</scope>
                <exclusions>
                    <exclusion>
                        <groupId>org.junit.vintage</groupId>
                        <artifactId>junit-vintage-engine</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>

            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
            </dependency>

        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

demo-common/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.springboot.demo</groupId>
        <artifactId>demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>com.springboot.demo</groupId>
    <artifactId>demo-common</artifactId>
    <version>${demo.version}</version>
    <name>demo-common</name>
    <description>Demo common project for Spring Boot</description>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

demo-service/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.springboot.demo</groupId>
        <artifactId>demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>com.springboot.demo</groupId>
    <artifactId>demo-service</artifactId>
    <version>${demo.version}</version>
    <name>demo-service</name>
    <description>Demo service project for Spring Boot</description>

    <dependencies>
        <dependency>
            <groupId>com.springboot.demo</groupId>
            <artifactId>demo-common</artifactId>
            <version>${demo.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

demo-web/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.springboot.demo</groupId>
        <artifactId>demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>com.springboot.demo</groupId>
    <artifactId>demo-web</artifactId>
    <version>${demo.version}</version>
    <name>demo-web</name>
    <description>Demo web project for Spring Boot</description>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.springboot.demo</groupId>
            <artifactId>demo-service</artifactId>
            <version>${demo.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

Profile集成

demo-web/src/main/resources中添加不同環境的屬性文件，然後在application.properties中指定默認的spring.profiles.active=dev即可

其他環境，啓動腳本中運行參數指定對應環境即可，如生產環境啓動腳本如：

#!/bin/bash

GC_LOG_PATH="/opt/log/gc"
JVM_OPTS="-server -Xms2g -Xmx2g -Xss2m -XX:NewRatio=3 -XX:SurvivorRatio=8 -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+UseTLAB -XX:+CMSParallelRemarkEnabled -XX:+CMSClassUnloadingEnabled -Xloggc:${GC_LOG_PATH}/gc.log -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -XX:+PrintGCDetails"
mkdir -p ${GC_LOG_PATH}
java ${JVM_OPTS} -jar demo-web-0.0.1-SNAPSHOT.jar --spring.profiles.active=prd
exit