多maven项目的搭建和依赖关系详细讲解


项目结构

多maven项目的搭建和依赖关系详细讲解

各工程介绍

1、父工程

<?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>org.example</groupId>
<artifactId>SSM_lyk_parent</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<modules>
<module>../SSM_lyk_common</module>
<module>../SSM_lyk_main</module>
<module>../SSM_lyk_bean</module>
<module>../SSM_lyk_manager</module>
<module>../SSM_lyk_managerimpl</module>
</modules>

</project>

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

<?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_bean</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>
</project>

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

<?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_manager</artifactId>
<version>1.0-SNAPSHOT</version>

<dependencies>
<!--@Repository注解需要用到spring-context-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.1.5.RELEASE</version>
<scope>compile</scope>
</dependency>

<!--将实体类工程依赖引入-->
<dependency>
<groupId>com.kang</groupId>
<artifactId>SSM_lyk_bean</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>

</project>

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>
<!--将接口工程依赖引入-->
<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
多maven项目的搭建和依赖关系详细讲解

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">

<!--扫描依赖项目中的注解,也可以在依赖的项目中新建spring配置文件,对注解进行扫描,这边就不需要再扫描了-->
<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>

<!-- 配置扫描Dao接口包,实现Dao接口注入到spring容器中 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" id="configurer">
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!--指定sql映射文件/接口所在包-->
<!--这里扫描的是依赖工程中的dao所在包-->
<property name="basePackage" value="com.kang.*.dao"/>
</bean>

<bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager" id="transactionManager">
<property name="dataSource" ref="DataSource"/>
</bean>

<!--事务-->
<tx:advice id="txadvice">
<tx:attributes>
<!--如果当前存在事务,则加入该事务;如果当前没有事务,则创建一个新的事务。
这是默认值这是默认值,表示使用底层数据库的默认隔离级别。对大部分数据库而言,通常这值就是
遇到任何异常直接回滚-->
<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> <!--所以类型 com.kang下面的以service结尾类的所以方式所有参数-->
<aop:advisor advice-ref="txadvice" pointcut="execution(* com.kang..*Service.*(..))"/>
</aop:config>
</beans>

4)springmvc.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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!--只扫描controller-->
<context:component-scan base-package="com.kang" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!--加载静态资源-->
<mvc:default-servlet-handler/>
<!--加载视图解析器-->
<mvc:annotation-driven/>

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>

<!--遇到任何错误都跳转到当前页面-->
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver" id="resolver">
<property name="exceptionMappings" >
<props>
<prop key="java.lang.Exception">error/error</prop>
</props>
</property>
</bean>

<!--上传最大数和上传编码,延迟加载-->
<bean class="org.springframework.web.multipart.commons.CommonsMultipartResolver" id="multipartResolver" p:defaultEncoding="UTF-8">
<property name="maxUploadSize" value="2097152"/>
<property name="resolveLazily" value="true"/>
</bean>
</beans>

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

<?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>
<artifactId>SSM_lyk_main</artifactId>
<packaging>war</packaging>

<parent>
<artifactId>SSM_lyk_parent</artifactId>
<groupId>org.example</groupId>
<version>1.0-SNAPSHOT</version>
<relativePath>../SSM_lyk_parent/pom.xml</relativePath>
</parent>

<!--将实现类工程依赖引入-->
<dependencies>
<dependency>
<groupId>com.kang</groupId>
<artifactId>SSM_lyk_managerimpl</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>

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">

<!--过滤器-->
<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>
<!--请求与响应编码都为utf-8-->
<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>
<!--设置转发和重定向乱码,默认是转发,当设置了重定向就得在设置转发-->
<!--<dispatcher>FORWARD</dispatcher>
<dispatcher>REQUEST</dispatcher>-->
</filter-mapping>

<!--spring.xml默认加载不到时,通过监听器去加载-->
<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>

<!--会话超时时间-->
<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。
多maven项目的搭建和依赖关系详细讲解
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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多maven项目的搭建和依赖关系详细讲解

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