多maven项目的搭建和依赖关系详细讲解

女爷i 2022-12-03 09:07 81阅读 0赞

### 项目结构 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjkzNjAz_size_16_color_FFFFFF_t_70_pic_left]

### 各工程介绍 ###

**1、父工程**

**2、实体类工程**  
1）实体类

public class User { 
        private Integer id;
        private String name;
        private Integer age;
        private String phone;
        public User(){ 
        }
        public User(String name, Integer age, String phone) { 
            this.name = name;
            this.age = age;
            this.phone = phone;
        }
        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;
        }
        public String getPhone() { 
            return phone;
        }
        public void setPhone(String phone) { 
            this.phone = phone;
        }
    }

2）pom.xml

**3、接口工程**  
1）dao层

@Repository
    public interface TestDao { 
        void insert(User user);
    }

2）service层

public interface TestService { 
        void insert(User user);
    }

3）pom.xml

**4、实现类工程**  
1）实现类

@Service
    public class TestServiceimpl implements TestService { 
    
        @Autowired
        private TestDao testdao;
    
        @Override
        public void insert(User user) { 
            testdao.insert(user);
        }
    }

2）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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <groupId>com.kang</groupId>
        <artifactId>SSM_lyk_managerimpl</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <parent>
            <artifactId>SSM_lyk_parent</artifactId>
            <groupId>org.example</groupId>
            <version>1.0-SNAPSHOT</version>
            <relativePath>../SSM_lyk_parent/pom.xml</relativePath>
        </parent>
    
    <dependencies>
    	
        <dependency>
            <groupId>com.kang</groupId>
            <artifactId>SSM_lyk_manager</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.5</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
    
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>commons-collections</groupId>
            <artifactId>commons-collections</artifactId>
            <version>3.2.2</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.22</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.5</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.4</version>
        </dependency>
    </dependencies>
    </project>

**5、controller/视图工程**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjkzNjAz_size_16_color_FFFFFF_t_70_pic_left 1]

1）controller层

@Controller
    public class Test { 
        @Autowired
       private TestService testService;
    
        @RequestMapping("/insert")
        public String insert(){ 
            User user=new User("小白",18,"11012011911");
            testService.insert(user);
            return "success";
        }
    }

2）jdbc.properties(druid连接池)

jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://localhost:3306/demo?useSSL=true&useUnicode=false&characterEncoding=UTF-8
    jdbc.username=root
    jdbc.password=root

3）spring.xml

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx https://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
    
        
        <context:component-scan base-package="com.kang" use-default-filters="false">
            <context:include-filter type="annotation" expression="org.springframework.stereotype.Service"/>
            <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository"/>
        </context:component-scan>
    
        <context:property-placeholder location="classpath:config/db.properties"/>
        <bean id="DataSource" class="com.alibaba.druid.pool.DruidDataSource">
            <property name="driverClassName" value="${jdbc.driver}"/>
            <property name="username" value="${jdbc.username}"/>
            <property name="url" value="${jdbc.url}"/>
            <property name="password" value="${jdbc.password}"/>
        </bean>
    
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="DataSource"/>
            <property name="configLocation" value="classpath:mybatis-config.xml"/>
            <property name="mapperLocations" value="classpath:userMapper.xml"/>
    
        </bean>
    
        
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" id="configurer">
            <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
            
            
            <property name="basePackage" value="com.kang.*.dao"/>
        </bean>
    
        <bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager" id="transactionManager">
            <property name="dataSource" ref="DataSource"/>
        </bean>
    
        
        <tx:advice id="txadvice">
        <tx:attributes>
            
            <tx:method name="*" propagation="REQUIRED" isolation="DEFAULT" rollback-for="java.lang.Exception"/>
            <tx:method name="query" read-only="true"/>
            </tx:attributes>
        </tx:advice>
        <aop:config>                
            <aop:advisor advice-ref="txadvice" pointcut="execution(* com.kang..*Service.*(..))"/>
        </aop:config>
    </beans>

4）springmvc.xml

5）userMapper.xml(映射文件)

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.kang.manager.dao.TestDao">
        <insert id="insert" parameterType="com.kang.bean.User">
            insert into t_user(name,age,phone) values (#{name},#{age},#{phone})
        </insert>
    </mapper>

6）pom.xml

7）web.xml

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0">
        
        
        <filter>
            <filter-name>encoding</filter-name>
            <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
            <init-param>
                <param-name>encoding</param-name>
                <param-value>utf-8</param-value>
            </init-param>
            
            <init-param>
                <param-name>forceEncoding</param-name>
                <param-value>true</param-value>
            </init-param>
        </filter>
    
        <filter-mapping>
            <filter-name>encoding</filter-name>
            <url-pattern>/*</url-pattern>
            
            
        </filter-mapping>
    
    	
        <context-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/spring.xml</param-value>
        </context-param>
        <listener>
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>
        
        <servlet>
            <servlet-name>springmvc</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath*:spring/springmvc.xml</param-value>
            </init-param>
        </servlet>
        <servlet-mapping>
            <servlet-name>springmvc</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
    
        
        <session-config>
            <session-timeout>30</session-timeout>
        </session-config>
        <welcome-file-list>
            <welcome-file>index.jsp</welcome-file>
        </welcome-file-list>
    </web-app>

### 总结： ###

1、多maven项目之间，通过在pom.xml中引入对应项目的坐标实现交互。

2、[maven项目运行时，默认会加载resources资源目录下的文件。如果dao层对应的mapper.xml文件在src目录下，则需要在pom.xml配置，让项目去src下加载mapper.xml。][maven_resources_dao_mapper.xml_src_pom.xml_src_mapper.xml]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjkzNjAz_size_16_color_FFFFFF_t_70_pic_left 2]  
3、如果项目运行时，出现以下错误：  
Error creating bean with name ‘test’: Unsatisfied dependency expressed through field ‘testService’; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type ‘com.kang.manager.service.TestService’ available。  
注解也加了，相应的配置也有了。为什么会导致注入类失败呢。  
可能是spring配置文件并未加载到。  
解决：在web.xml配置中，配置监听器，监听加载spring.xml。  
  
写作不易。。。既然来了，不妨点个关注，点个赞吧！！！

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjkzNjAz_size_16_color_FFFFFF_t_70_pic_left 1]: /images/20221123/f33a4755080145b0aba11fd8584eef3f.png
[maven_resources_dao_mapper.xml_src_pom.xml_src_mapper.xml]: https://blog.csdn.net/qq_40693603/article/details/106662075
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjkzNjAz_size_16_color_FFFFFF_t_70_pic_left 2]: /images/20221123/769dd444c29348e5b6be2dcb8e28bbf5.png