一 .创建父工程:
1.首先使用 Spring Initializr 来快速创建好一个Maven工程。然后删除无关的文件，只需保留pom.xml 文件。
- 然后在 pom.xml 里面声明该父工程包含的子模块。（其它信息就不逐一讲述了，诸如继承SpringBoot官方父工程以及统一依赖管理 请查看下面的注释说明）
<?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"> <!-- 基本信息 --> <description>SpringBoot 多模块构建示例</description> <modelVersion>4.0.0</modelVersion> <name>springboot-multi-module</name> <packaging>pom</packaging> <!-- 项目说明：这里作为聚合工程的父工程 --> <groupId>com.cicoding</groupId> <artifactId>springboot-multi-module</artifactId> <version>1.0.0.RELEASE</version> <!-- 继承说明：这里继承SpringBoot提供的父工程 --> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.7.RELEASE</version> <relativePath/> </parent> <!-- 模块说明：这里声明多个子模块 --> <modules> <module>cicoding-web</module> <module>cicoding-service</module> <module>cicoding-repo</module> <module>cicoding-entity</module> </modules> <!-- 版本说明：这里统一管理依赖的版本号 --> <dependencyManagement> <dependencies> <dependency> <groupId>com.cicoding</groupId> <artifactId>cicoding-web</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> <dependency> <groupId>com.cicoding</groupId> <artifactId>cicoding-service</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> <dependency> <groupId>com.cicoding</groupId> <artifactId>cicoding-repo</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> <dependency> <groupId>com.cicoding</groupId> <artifactId>cicoding-entity</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> </dependencies> </dependencyManagement> </project>
二、创建子模块（module）
注：这里是使用IDEA来创建子模块，使用Eclipse的小伙伴可通过 Spring Initializr 构建，然后复制去进去父工程根目录即可。1.对着父工程右键 - New - Module - > 输入 cicoding-web
2.对着父工程右键 - New - Module - > 输入 cicoding-service
3.对着父工程右键 - New - Module - > 输入 cicoding-repo
4.对着父工程右键 - New - Module - > 输入 cicoding-entity
1~4 步骤完成后，分别调整它们的pom.xml 以继承上面的父工程。
例如cicoding-web模块的pom.xml 需要改造成这样：
<?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> <!-- 基本信息 --> <groupId>com.cicoding</groupId> <artifactId>cicoding-web</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>cicoding-web</name> <!-- 继承本项目的父工程 --> <parent> <groupId>com.cicoding</groupId> <artifactId>springboot-multi-module</artifactId> <version>1.0.0.RELEASE</version> </parent> <!-- Web模块相关依赖 --> <dependencies> <dependency> <groupId>com.cicoding</groupId> <artifactId>cicoding-service</artifactId> </dependency> <dependency> <groupId>com.cicoding</groupId> <artifactId>cicoding-entity</artifactId> </dependency> <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> </project>
三、编写子模块代码
1. 控制层（cicoding-web）
启动类 ：MmWebApplication.java （cicoding-web）
package com.cicoding.integration;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* 注：为了避免扫描路径不一致，请将启动类放在Root Package 即 com.cicoding.integration
*/
@SpringBootApplication
public class MmWebApplication {
public static void main(String[] args) {
SpringApplication.run(MmWebApplication.class, args);
}
}
控制器：UserController.java （cicoding-web ）
package com.cicoding.integration.user;
import com.cicoding.integration.common.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/user/*")
public class UserController {
@Autowired
UserService userService;
@GetMapping("list")
public R list() {
try {
return R.isOk().data(userService.list());
} catch (Exception e) {
return R.isFail(e);
}
}
}
配置文件：application.yml （cicoding-web）
spring:
datasource:
url: jdbc:mysql://localhost:3306/test?useSSL=false
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
2. 业务层（cicoding-service）
实现类：UserServiceImpl.java （cicoding-service）
package com.cicoding.integration.user;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImpl implements UserService {
@Autowired
UserRepository userRepository;
@Override
public List<User> list() {
return userRepository.findAll();
}
}
3. 数据层（cicoding-repo）
数据层代码：UserRepository.java （cicoding-repo）
package com.cicoding.integration.user;
import org.springframework.data.jpa.repository.JpaRepository;
public interface UserRepository extends JpaRepository<User,String> {
}
4. cicoding-entity (实体模型层)
R.java 作为统一返回的Bean对象
package com.cicoding.integration.common;
import java.io.Serializable;
public class R<T> implements Serializable {
private static final long serialVersionUID = -4577255781088498763L;
private static final int OK = 0;
private static final int FAIL = 1;
private static final int UNAUTHORIZED = 2;
private T data; //服务端数据
private int status = OK; //状态码
private String msg = ""; //描述信息
//APIS
public static R isOk() {
return new R();
}
public static R isFail() {
return new R().status(FAIL);
}
public static R isFail(Throwable e) {
return isFail().msg(e);
}
public R msg(Throwable e) {
this.setMsg(e.toString());
return this;
}
public R data(T data) {
this.setData(data);
return this;
}
public R status(int status) {
this.setStatus(status);
return this;
}
//Constructors
public R() {
}
//Getter&Setters
public T getData() {
return data;
}
public void setData(T data) {
this.data = data;
}
public int getStatus() {
return status;
}
public void setStatus(int status) {
this.status = status;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
package com.cicoding.integration.user;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "T_USER")
public class User {
@Id
@Column(name = "USERID")
private String userId;
@Column(name = "USERNAME")
private String username;
@Column(name = "PASSWORD")
private String password;
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
三、运行项目
运行主类:
到此就结束了!
参考文献
https://www.jianshu.com/p/59ceea4f029d
https://spring.io/guides/gs/multi-module/