1、创建父工程最近公司项目准备开始重构,框架选定为 SpringBoot + Mybatis,本篇主要记录了在IDEA中搭建 Spring Boot 多模块项目的过程。
1、开发工具及系统环境2、项目目录结构
1、创建父工程IDEA 工具栏选择菜单 File -> New -> Project... 选择Spring Initializr,Initializr默认选择Default,点击Next删除无用的.mvn目录、src目录、mvnw及mvnw.cmd文件,最终只留.gitignore和pom.xml2、创建子模块选择项目根目录beta右键呼出菜单,选择New -> Module 填写ArifactId,点击Next
修改Module name增加横杠提升可读性,点击Finish 同理添加beta-dao、beta-web子模块,最终得到项目目录结构如下图 3、运行项目在beta-web层创建com.yibao.beta.web包(注意:这是多层目录结构并非单个目录名,com >> yibao >> beta >> web)并添加入口类BetaWebApplication.java @SpringBootApplication public class BetaWebApplication {
public static void main(String[] args) { SpringApplication.run(BetaWebApplication.class, args); } }
在com.yibao.beta.web包中添加controller目录并新建一个controller,添加test方法测试接口是否可以正常访问 @RestController @RequestMapping("demo") public class DemoController {
@GetMapping("test") public String test() { return "Hello World!"; } }
运行BetaWebApplication类中的main方法启动项目,默认端口为8080,访问 http://localhost:8080/demo/test得到如下效果 以上虽然项目能正常启动,但是模块间的依赖关系却还未添加,下面继续完善。微信搜索 web_resource 获取更多推送 4、配置模块间的依赖关系各个子模块的依赖关系:biz层依赖dao层,web层依赖biz层父pom文件中声明所有子模块依赖(dependencyManagement及dependencies的区别自行查阅文档) <dependencyManagement> <dependencies> <dependency> <groupId>com.yibao.betagroupId> <artifactId>beta-bizartifactId> <version>${beta.version}version> </dependency> <dependency> <groupId>com.yibao.betagroupId> <artifactId>beta-daoartifactId> <version>${beta.version}version> </dependency> <dependency> <groupId>com.yibao.betagroupId> <artifactId>beta-webartifactId> <version>${beta.version}version> </dependency> </dependencies> </dependencyManagement>
其中${beta.version}定义在properties标签中 在beta-web层中的pom文件中添加beta-biz依赖 <dependencies> <dependency> <groupId>com.yibao.betagroupId> <artifactId>beta-bizartifactId> </dependency> </dependencies>
在beta-biz层中的pom文件中添加beta-dao依赖 <dependencies> <dependency> <groupId>com.yibao.betagroupId> <artifactId>beta-daoartifactId> </dependency> </dependencies>
5 web层调用biz层接口测试 在beta-biz层创建com.yibao.beta.biz包,添加service目录并在其中创建DemoService接口类,微信搜索 web_resource 获取更多推送 public interface DemoService { String test(); }
@Service public class DemoServiceImpl implements DemoService {
@Override public String test() { return "test"; } }
DemoController通过@Autowired注解注入DemoService,修改DemoController的test方法使之调用DemoService的test方法,最终如下所示: package com.yibao.beta.web.controller;@RestController @RequestMapping("demo") public class DemoController {
@Autowired private DemoService demoService;
@GetMapping("test") public String test() { return demoService.test(); } }
再次运行BetaWebApplication类中的main方法启动项目,发现如下报错 *************************** APPLICATION FAILED TO START ***************************
Description: Field demoService in com.yibao.beta.web.controller.DemoController required a bean of type 'com.yibao.beta.biz.service.DemoService' that could not be found.
Action: Consider defining a bean of type 'com.yibao.beta.biz.service.DemoService' in your configuration.
原因是找不到DemoService类,此时需要在BetaWebApplication入口类中增加包扫描,设置@SpringBootApplication注解中的scanBasePackages值为com.yibao.beta,最终如下所示 package com.yibao.beta.web;
@SpringBootApplication(scanBasePackages = "com.yibao.beta") @MapperScan("com.yibao.beta.dao.mapper") public class BetaWebApplication {
public static void main(String[] args) { SpringApplication.run(BetaWebApplication.class, args); } }
设置完后重新运行main方法,项目正常启动,访问http://localhost:8080/demo/test得到如下效果 6. 集成Mybatis父pom文件中声明mybatis-spring-boot-starter及lombok依赖 dependencyManagement> <dependencies> <dependency> <groupId>org.mybatis.spring.bootgroupId> <artifactId>mybatis-spring-boot-starterartifactId> <version>1.3.2version> </dependency> <dependency> <groupId>org.projectlombokgroupId> <artifactId>lombokartifactId> <version>1.16.22version> </dependency> </dependencies> </dependencyManagement>
在beta-dao层中的pom文件中添加上述依赖 <dependencies> <dependency> <groupId>org.mybatis.spring.bootgroupId> <artifactId>mybatis-spring-boot-starterartifactId> </dependency> <dependency> <groupId>mysqlgroupId> <artifactId>mysql-connector-javaartifactId> </dependency> <dependency> <groupId>org.projectlombokgroupId> <artifactId>lombokartifactId> </dependency> </dependencies>
在beta-dao层创建com.yibao.beta.dao包,通过mybatis-genertaor工具生成dao层相关文件(DO、Mapper、xml),存放目录如下 applicatio.properties文件添加jdbc及mybatis相应配置项 spring.datasource.driverClassName = com.mysql.jdbc.Driver spring.datasource.url = jdbc:mysql://192.168.1.1/test?useUnicode=true&characterEncoding=utf-8 spring.datasource.username = test spring.datasource.password = 123456
mybatis.mapper-locations = classpath:mybatis/*.xml mybatis.type-aliases-package = com.yibao.beta.dao.entity
DemoService通过@Autowired注解注入UserMapper,修改DemoService的test方法使之调用UserMapper的selectByPrimaryKey方法,最终如下所示 package com.yibao.beta.biz.service.impl;
@Service public class DemoServiceImpl implements DemoService {
@Autowired private UserMapper userMapper;
@Override public String test() { UserDO user = userMapper.selectByPrimaryKey(1); return user.toString(); } }
再次运行BetaWebApplication类中的main方法启动项目,发现如下报错 APPLICATION FAILED TO START ***************************
Description: Field userMapper in com.yibao.beta.biz.service.impl.DemoServiceImpl required a bean of type 'com.yibao.beta.dao.mapper.UserMapper' that could not be found.
Action: Consider defining a bean of type 'com.yibao.beta.dao.mapper.UserMapper' in your configuration.
原因是找不到UserMapper类,此时需要在BetaWebApplication入口类中增加dao层包扫描,添加@MapperScan注解并设置其值为com.yibao.beta.dao.mapper,最终如下所示 package com.yibao.beta.web;
@SpringBootApplication(scanBasePackages = "com.yibao.beta") @MapperScan("com.yibao.beta.dao.mapper") public class BetaWebApplication {
public static void main(String[] args) { SpringApplication.run(BetaWebApplication.class, args); } }
设置完后重新运行main方法,项目正常启动,访问http://localhost:8080/demo/test得到如下效果
一个层次分明的多模块工程结构不仅方便维护,而且有利于后续微服务化。在此结构的基础上还可以扩展common层(公共组件)、server层(如dubbo对外提供的服务)微信搜索 web_resource 获取更多推送此为项目重构的第一步,后续还会的框架中集成logback、disconf、redis、dubbo等组件。
在搭建过程中还遇到一个maven私服的问题,原因是公司内部的maven私服配置的中央仓库为阿里的远程仓库,它与maven自带的远程仓库相比有些jar包版本并不全,导致在搭建过程中好几次因为没拉到相应jar包导致项目启动不了。作者:枫本非凡 www.cnblogs.com/orzlin/p/9717399.html
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