多maven项目的搭建和依赖关系详细讲解
项目结构
各工程介绍
1、父工程
<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>4.0.0modelVersion>
<groupId>org.examplegroupId>
<artifactId>SSM_lyk_parentartifactId>
<version>1.0-SNAPSHOTversion>
<packaging>pompackaging>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
properties>
<modules>
<module>../SSM_lyk_commonmodule>
<module>../SSM_lyk_mainmodule>
<module>../SSM_lyk_beanmodule>
<module>../SSM_lyk_managermodule>
<module>../SSM_lyk_managerimplmodule>
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
<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>4.0.0modelVersion>
<groupId>com.kanggroupId>
<artifactId>SSM_lyk_beanartifactId>
<version>1.0-SNAPSHOTversion>
<parent>
<artifactId>SSM_lyk_parentartifactId>
<groupId>org.examplegroupId>
<version>1.0-SNAPSHOTversion>
<relativePath>../SSM_lyk_parent/pom.xmlrelativePath>
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
<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>4.0.0modelVersion>
<groupId>com.kanggroupId>
<artifactId>SSM_lyk_managerartifactId>
<version>1.0-SNAPSHOTversion>
<dependencies>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-contextartifactId>
<version>5.1.5.RELEASEversion>
<scope>compilescope>
dependency>
<dependency>
<groupId>com.kanggroupId>
<artifactId>SSM_lyk_beanartifactId>
<version>1.0-SNAPSHOTversion>
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
<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>4.0.0modelVersion>
<groupId>com.kanggroupId>
<artifactId>SSM_lyk_managerimplartifactId>
<version>1.0-SNAPSHOTversion>
<parent>
<artifactId>SSM_lyk_parentartifactId>
<groupId>org.examplegroupId>
<version>1.0-SNAPSHOTversion>
<relativePath>../SSM_lyk_parent/pom.xmlrelativePath>
parent>
<dependencies>
<dependency>
<groupId>com.kanggroupId>
<artifactId>SSM_lyk_managerartifactId>
<version>1.0-SNAPSHOTversion>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-testartifactId>
<version>5.2.8.RELEASEversion>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>5.1.46version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-ormartifactId>
<version>5.2.8.RELEASEversion>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatisartifactId>
<version>3.5.5version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-aopartifactId>
<version>5.2.8.RELEASEversion>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-jdbcartifactId>
<version>5.2.8.RELEASEversion>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-webmvcartifactId>
<version>5.2.8.RELEASEversion>
dependency>
<dependency>
<groupId>commons-collectionsgroupId>
<artifactId>commons-collectionsartifactId>
<version>3.2.2version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druidartifactId>
<version>1.1.22version>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatis-springartifactId>
<version>2.0.5version>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-aspectsartifactId>
<version>5.2.7.RELEASEversion>
dependency>
<dependency>
<groupId>commons-fileuploadgroupId>
<artifactId>commons-fileuploadartifactId>
<version>1.4version>
dependency>
dependencies>
project>
5、controller/视图工程
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
<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
<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">
<context:component-scan base-package="com.kang" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
context:component-scan>
<mvc:default-servlet-handler/>
<mvc:annotation-driven/>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
bean>
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver" id="resolver">
<property name="exceptionMappings" >
<props>
<prop key="java.lang.Exception">error/errorprop>
props>
property>
bean>
<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)
<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
<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>4.0.0modelVersion>
<artifactId>SSM_lyk_mainartifactId>
<packaging>warpackaging>
<parent>
<artifactId>SSM_lyk_parentartifactId>
<groupId>org.examplegroupId>
<version>1.0-SNAPSHOTversion>
<relativePath>../SSM_lyk_parent/pom.xmlrelativePath>
parent>
<dependencies>
<dependency>
<groupId>com.kanggroupId>
<artifactId>SSM_lyk_managerimplartifactId>
<version>1.0-SNAPSHOTversion>
dependency>
dependencies>
project>
7）web.xml
<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>encodingfilter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
<init-param>
<param-name>encodingparam-name>
<param-value>utf-8param-value>
init-param>
<init-param>
<param-name>forceEncodingparam-name>
<param-value>trueparam-value>
init-param>
filter>
<filter-mapping>
<filter-name>encodingfilter-name>
<url-pattern>/*url-pattern>
filter-mapping>
<context-param>
<param-name>contextConfigLocationparam-name>
<param-value>classpath:spring/spring.xmlparam-value>
context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
listener>
<servlet>
<servlet-name>springmvcservlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
<init-param>
<param-name>contextConfigLocationparam-name>
<param-value>classpath*:spring/springmvc.xmlparam-value>
init-param>
servlet>
<servlet-mapping>
<servlet-name>springmvcservlet-name>
<url-pattern>/url-pattern>
servlet-mapping>
<session-config>
<session-timeout>30session-timeout>
session-config>
<welcome-file-list>
<welcome-file>index.jspwelcome-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。
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！！！