2 springboot多模块项目

一般来说创建一个springboot工程基本就可以了，但是有的时候可能需要将业务模块逻辑划分，每块业务模块都是一个工程，下边演示下多模块进行开发

目录结构

...somefun

......somefun-web

......somefun-service-system

.........somefun-system-api

.........somefun-system-service

somefun项目父工程

somefun-web  项目中的web模块（springboot项目）

somefun-service-system  system服务模块父工程

somefun-system-api  system服务模块api部分 存放server接口和dto 非常简单的一层

somefun-system-service   system服务具体逻辑实现模块

pom文件

这种开发的方式本质上还是将多个模块以jar包的方式引用进来，所以引用关系非常简单

somefun-web 引用 somefun-system-api和 somefun-system-service即可。

创建web项目时相当于独立模块创建，所以讲web模块中的pom文件部分内容移动到父项目中，具体修改后的内容如下

somefun 的pom.xml文件

 <?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>

     <groupId>com.zhj</groupId>
     <artifactId>somefun</artifactId>

     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>2.1.1.RELEASE</version>
         <relativePath/>
     </parent>

     <packaging>pom</packaging>
     <version>1.0-SNAPSHOT</version>
     <modules>
         <module>somefun-service-system</module>
         <module>somefun-web</module>
     </modules>

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

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

     <build>
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.1</version>
                 <configuration>
                     <source>${java.version}</source>
                     <target>${java.version}</target>
                 </configuration>
             </plugin>

             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>2.19.1</version>
                 <configuration>
                     <skipTests>true</skipTests>
                 </configuration>
             </plugin>
         </plugins>
     </build>

 </project>

somefun-web 的pom.xml文件

我们需要在pom中指定下启动类文件

 <?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">

     <parent>
         <artifactId>somefun</artifactId>
         <groupId>com.zhj</groupId>
         <version>1.0-SNAPSHOT</version>
     </parent>

     <modelVersion>4.0.0</modelVersion>

     <groupId>com.zhj</groupId>
     <artifactId>somefun-web</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <packaging>jar</packaging>
     <name>somefun-web</name>

     <dependencies>

         <dependency>
             <groupId>com.zhj</groupId>
             <artifactId>somefun-system-api</artifactId>
             <version>1.0-SNAPSHOT</version>
         </dependency>

         <dependency>
             <groupId>com.zhj</groupId>
             <artifactId>somefun-system-service</artifactId>
             <version>1.0-SNAPSHOT</version>
         </dependency>
     </dependencies>

     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
                 <configuration>
                     <mainClass>com.zhj.somefun.web.SomefunWebApplication</mainClass>
                     <layout>ZIP</layout>
                 </configuration>
                 <executions>
                     <execution>
                         <goals>
                             <goal>repackage</goal>
                         </goals>
                     </execution>
                 </executions>
             </plugin>
         </plugins>
     </build>

 </project>

somefun-system-api 的pom.xml文件

 <?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <parent>
         <artifactId>somefun-service-system</artifactId>
         <groupId>com.zhj</groupId>
         <version>1.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <version>1.0-SNAPSHOT</version>
     <artifactId>somefun-system-api</artifactId>
 </project>

somefun-system-service 的pom.xml文件

 <?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <parent>
         <artifactId>somefun-service-system</artifactId>
         <groupId>com.zhj</groupId>
         <version>1.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>

     <artifactId>somefun-system-service</artifactId>
     <dependencies>

         <dependency>
             <groupId>com.zhj</groupId>
             <artifactId>somefun-system-api</artifactId>
             <version>1.0-SNAPSHOT</version>
         </dependency>
     </dependencies>

 </project>

我们添加下测试代码

somefun-system-api 模块

 package com.zhj.somefun.system.api.dto;

 public class TestDto{
     private Integer id;
     private String name;
     public Integer getId() {
         return id;
     }
     public void setId(Integer id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public Integer getAge() {
         return age;
     }
     public void setAge(Integer age) {
         this.age = age;
     }
     private Integer age;

 package com.zhj.somefun.system.api.service;

 import com.zhj.somefun.system.api.dto.TestDto;

 import java.util.List;

 public interface TestService {
     public List<TestDto> getTestList();
 }

somefun-system-service 模块

 package com.zhj.somefun.system.service.impl;

 import com.zhj.somefun.system.api.dto.TestDto;
 import com.zhj.somefun.system.api.service.TestService;
 import org.apache.el.stream.Stream;
 import org.springframework.stereotype.Service;

 import java.util.ArrayList;
 import java.util.List;

 @Service
 public class TestServiceImpl implements TestService {

     @Override
     public List<TestDto> getTestList() {
         List<TestDto> list = new ArrayList<>();
         TestDto dto = new TestDto();
         dto.setAge(18);
         dto.setId(1);
         dto.setName("姓名");
         list.add(dto);
         return list;
     }
 }

somefun-web模块

 package com.zhj.somefun.web.controller;

 import com.zhj.somefun.system.api.dto.TestDto;
 import com.zhj.somefun.system.api.service.TestService;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;

 import java.util.List;

 @RestController
 public class Testcontroller {

     @Autowired
     TestService testService;

     @GetMapping("/sayhello")
     public String sayHello() {
         return "Hello Word";
     }

     @GetMapping("/getlist")
     public List<TestDto> getlist(){
         return testService.getTestList();
     }
 }

 package com.zhj.somefun.web;

 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.ComponentScan;

 @SpringBootApplication (scanBasePackages={"com.zhj.somefun"})
 public class SomefunWebApplication {

     public static void main(String[] args) {
         SpringApplication.run(SomefunWebApplication.class, args);
     }
 }

SpringBoot在启动过程中会自动扫描启动类所在包名下的注解，如果不在启动类的包名下边的话就不会扫描到

咱们的启动类SomefunWebApplication所在的报名是com.zhj.somefun.web，system-service中的服务所在的报名为com.zhj.somefun.system.service 类并不在com.zhj.somefun.web下，所以启动类在扫描注解的时候不会扫描到service类，所以需要修改启动类代码。

1.将SomefunWebApplication类移动到com.zhj.somefun包下，这样扫描的时候可以将服务一起扫描到。

2.在启动类加上注解指定扫描包 scanBasePackages={"com.zhj.somefun"}

我们采用注解的方式

启动程序 访问域名 http://localhost:8080/getlist

会看到返回值：

[{"id":1,"name":"姓名","age":18}]

多模块程序打包

我们使用idea工具进行打包

选择父项目somefun

双击package

打包成功：

找到target目录中会发现已经打包好的jar文件

cmd切换到此目录，执行命令

java -jar somefun-web-0.0.1-SNAPSHOT.jar

我们再次访问域名 http://localhost:8080/getlist

会看到返回值：

[{"id":1,"name":"姓名","age":18}]