【Java】Maven模块化工程SSM整合

创建数据库一个演示表User

CREATE TABLE `user` (
  `id` int NOT NULL AUTO_INCREMENT,
  `name` varchar(64) DEFAULT NULL,
  `password` varchar(64) DEFAULT NULL,
  `status` int DEFAULT '0',
  `is_del` int DEFAULT '0',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai

插入数据：

insert  into 
    `user`(`id`,`name`,`password`,`status`,`is_del`) 
values 
(1,'admin','admin',0,0),
(2,'user01','123456',0,0),
(3,'user02','123456',0,0),
(4,'user03','123456',0,0),
(5,'user04','123456',0,0),
(6,'user05','123456',0,0);

创建新的Maven工程，不点选任何骨架：

模块化工程，每一个结构层即一个模块，而现在这个工程的SRC可以删除：

创建最基本的三层结构：

Dao、Service、Controller

Dao和Service无骨架创建，但是控制器是视图层了，需要Web骨架搭建

构建完成发现Controller模块webapp没有被IDEA表示：

查看控制台发现：

No archetype found in remote catalog. Defaulting to internal catalog

远程骨架仓库未找到，调用的本地的

添加web：

选择控制器：

可以发现Maven指定web目录位置不存在，固然没有标记：

更改目录：

就有了：

设置Tomcat：

修复配置的工程：

启动测试：

---

所有依赖：

　　<properties>
        <spring.version>5.2.8.RELEASE</spring.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>

        <!-- JDBC & DataSource -->

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.20</version>
        </dependency>

        <dependency>
            <groupId>com.zaxxer</groupId>
            <artifactId>HikariCP</artifactId>
            <version>3.4.5</version>
        </dependency>

        <!-- log -->

        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.30</version>
        </dependency>

        <!-- JavaWeb -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <dependency>
            <groupId>org.apache.taglibs</groupId>
            <artifactId>taglibs-standard-impl</artifactId>
            <version>1.2.5</version>
        </dependency>

        <dependency>
            <groupId>org.apache.taglibs</groupId>
            <artifactId>taglibs-standard-impl</artifactId>
            <version>1.2.5</version>
        </dependency>

        <!-- Mybatis -->

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.5</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.5</version>
        </dependency>

        <!-- Spring & SpringMVC ... -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.6</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>

    </dependencies>

公共依赖，实际上也可以具体的根绝结构层来区分导入，不过太麻烦，省事就直接丢总工程的POM里面

Mybatis-Spring整合：

创建User实体类：

package cn.echo42.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @author DaiZhiZhou
 * @file SSM-ModuleVersion-Sample
 * @create 2020-08-08 9:16
 */

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private Integer id;
    private String name;
    private String password;
    private Integer status;
    private Integer is_del;
}

创建UserMapper接口

package cn.echo42.mapper;

import cn.echo42.pojo.User;

import java.util.List;

/**
 * @author DaiZhiZhou
 * @file SSM-ModuleVersion-Sample
 * @create 2020-08-08 9:20
 */
public interface UserMapper {
    List<User> queryUserList();
}

先创建mybatis配置和userMapper映射器配置：

下面Spring容器XML配置后面在设置，这里还忘了DB连接配置和日志配置

Mybatis-Configuration.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <settings>
        <setting name="logImpl" value="LOG4J"/>
    </settings>

</configuration>

仅留下日志配置选项，其他配置移交到Spring管理：

UserMapper.xml

<?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="cn.echo42.mapper.UserMapper">

    <select id="queryUserList" resultType="cn.echo42.pojo.User">
        SELECT * FROM user;
    </select>

</mapper>

补加日志和数据库连接：

db.properties

jdbc.driverClassName=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/sample?serverTimezone=GMT
jdbc.username=root
jdbc.password=123456

log4j.properties

# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# MyBatis logging configuration...
log4j.logger.org.mybatis.example.BlogMapper=TRACE
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

Application-Dao.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"

       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
"
>

    <context:component-scan base-package="cn.echo42.mapper"/> <!-- Spring注册扫描 -->
    
    <context:property-placeholder location="classpath:db.properties"/> <!-- jdbc连接配置读取加载 -->

    <!-- Spring 数据源配置 SpringJDBC的数据源 -->
<!--    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource" >-->
<!--        <property name="driverClassName" value="${jdbc.driverClassName}" />-->
<!--        <property name="url" value="${jdbc.url}" />-->
<!--        <property name="username" value="${jdbc.username}" />-->
<!--        <property name="password" value="${jdbc.password}" />-->
<!--    </bean>-->
    
    <!-- Hikari数据源 -->
    <bean id="dataSource" class="com.zaxxer.hikari.HikariDataSource" destroy-method="close" >
        <property name="driverClassName" value="${jdbc.driverClassName}" />
        <property name="jdbcUrl" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>
    
    <!-- 配置SqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>

        <!--  自动扫描mappers.xml文件  -->
        <property name="mapperLocations" value="classpath:mybatis/mapper/*.xml"/>
        <property name="configLocation" value="classpath:mybatis/Mybatis-Configuration.xml"/>
    </bean>

    <!-- DAO接口所在包名，Spring会自动查找其下的类 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="cn.echo42.mapper" />
        <!--<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>-->
    </bean>

</beans>

写一个测试类看看是否正常：

import cn.echo42.mapper.UserMapper;
import cn.echo42.pojo.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * @author DaiZhiZhou
 * @file SSM-ModuleVersion-Sample
 * @create 2020-08-08 9:37
 */

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:Application-Dao.xml")
public class DaoTest {

    @Autowired
    UserMapper userMapper;

    @Test
    public void testSample() {
        for (User user : userMapper.queryUserList()) {
            System.out.println(user);
        }
    }
}

结果：

log4j:WARN No appenders could be found for logger (org.springframework.test.context.junit4.SpringJUnit4ClassRunner).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
User(id=1, name=admin, password=admin, status=0, is_del=0)
User(id=2, name=user01, password=123456, status=0, is_del=0)
User(id=3, name=user02, password=123456, status=0, is_del=0)
User(id=4, name=user03, password=123456, status=0, is_del=0)
User(id=5, name=user04, password=123456, status=0, is_del=0)
User(id=6, name=user05, password=123456, status=0, is_del=0)

Process finished with exit code 0

日志没有配置到？【才发现少写了j...】

可以了：

INFO [main] - HikariPool-1 - Starting...
DEBUG [main] - HikariPool-1 - Added connection com.mysql.cj.jdbc.ConnectionImpl@59252cb6
 INFO [main] - HikariPool-1 - Start completed.
DEBUG [main] - JDBC Connection [HikariProxyConnection@1643141512 wrapping com.mysql.cj.jdbc.ConnectionImpl@59252cb6] will not be managed by Spring
DEBUG [main] - ==>  Preparing: SELECT * FROM user;
DEBUG [main] - ==> Parameters: 
DEBUG [main] - <==      Total: 6
DEBUG [HikariPool-1 housekeeper] - HikariPool-1 - Pool stats (total=1, active=1, idle=0, waiting=0)
DEBUG [main] - Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@194fad1]
User(id=1, name=admin, password=admin, status=0, is_del=0)
User(id=2, name=user01, password=123456, status=0, is_del=0)
User(id=3, name=user02, password=123456, status=0, is_del=0)
User(id=4, name=user03, password=123456, status=0, is_del=0)
User(id=5, name=user04, password=123456, status=0, is_del=0)
User(id=6, name=user05, password=123456, status=0, is_del=0)

结合Service业务层：

首先在业务层的Pom.xml中导入Dao层：

这样来自dao层的userMapper就可以被service层调用

    <dependencies>
        <dependency>
            <groupId>cn.echo42</groupId>
            <artifactId>Application-Dao</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

编写接口和实现类：

UserService接口：

package cn.echo42.service;

import cn.echo42.pojo.User;

import java.util.List;

/**
 * @author DaiZhiZhou
 * @file SSM
 * @create 2020-08-07 14:21
 */
public interface UserService {
    List<User> getUserList();
}

UserServiceImpl接口实现：

package cn.echo42.service.impl;

import cn.echo42.mapper.UserMapper;
import cn.echo42.pojo.User;
import cn.echo42.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @author DaiZhiZhou
 * @file SSM-ModuleVersion-Sample
 * @create 2020-08-08 9:51
 */

@Service("userService")
public class UserServiceImpl implements UserService {

    @Autowired
    UserMapper userMapper;

    public List<User> getUserList() {
        return userMapper.queryUserList();
    }
}

业务层的配置主要是扫描包，和事务配置，这里就不编写事务配置了

Application-Service.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:aop="http://www.springframework.org/schema/aop"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:c="http://www.springframework.org/schema/c"

       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/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd

       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
"
>

    <context:component-scan base-package="cn.echo42.service" />

</beans>

业务层测试类

注意我们的容器配置导入，是两个，一个dao一个Service，或者也可以使用import标签和并

import cn.echo42.pojo.User;
import cn.echo42.service.UserService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * @author DaiZhiZhou
 * @file SSM-ModuleVersion-Sample
 * @create 2020-08-08 9:56
 */

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:Application-Dao.xml", "classpath:Application-Service.xml"})
public class ServiceTest {

    @Autowired
    UserService userService;

    @Test
    public void testSample() {
        for (User user : userService.getUserList()) System.out.println(user);
    }
}

测试结果正常输出：

 INFO [main] - HikariPool-1 - Starting...
DEBUG [main] - HikariPool-1 - Added connection com.mysql.cj.jdbc.ConnectionImpl@753432a2
 INFO [main] - HikariPool-1 - Start completed.
DEBUG [main] - JDBC Connection [HikariProxyConnection@923083575 wrapping com.mysql.cj.jdbc.ConnectionImpl@753432a2] will not be managed by Spring
DEBUG [main] - ==>  Preparing: SELECT * FROM user;
DEBUG [main] - ==> Parameters: 
DEBUG [main] - <==      Total: 6
DEBUG [HikariPool-1 housekeeper] - HikariPool-1 - Pool stats (total=1, active=1, idle=0, waiting=0)
DEBUG [main] - Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2f953efd]
User(id=1, name=admin, password=admin, status=0, is_del=0)
User(id=2, name=user01, password=123456, status=0, is_del=0)
User(id=3, name=user02, password=123456, status=0, is_del=0)
User(id=4, name=user03, password=123456, status=0, is_del=0)
User(id=5, name=user04, password=123456, status=0, is_del=0)
User(id=6, name=user05, password=123456, status=0, is_del=0)

SpringMVC整合：

首先由Maven骨架创建Web工程没有提供源码和资源两个目录：

我们需要手动创建：

导入上一级Service业务层：

    <dependencies>
        <dependency>
            <groupId>cn.echo42</groupId>
            <artifactId>Application-Service</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

Application-Controller.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:mvc="http://www.springframework.org/schema/mvc"

       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/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
"
>

    <context:component-scan base-package="cn.echo42.controller" /> <!-- 控制器注册扫描 -->

    <mvc:default-servlet-handler/> <!-- 静态资源过滤器 -->

    <mvc:annotation-driven /> <!-- 注解驱动 -->

    <!-- 视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 前缀,这里是请求的路径文件 -->
        <property name="prefix" value="/WEB-INF/view/" />
        <!-- 后缀 ，支持.jsp的请求-->
        <property name="suffix" value=".jsp" />
    </bean>
    
    <import resource="Application-Dao.xml"/> <!-- 合并导入前2层的容器XML配置 -->
    <import resource="Application-Service.xml"/>

</beans>

Web.xml配置

导入Controller.xml用以加载

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>

  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:Application-Controller.xml</param-value>
    </init-param>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  
</web-app>

UserController编写：

package cn.echo42.controller;

import cn.echo42.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.Map;

/**
 * @author DaiZhiZhou
 * @file SSM-ModuleVersion-Sample
 * @create 2020-08-08 10:02
 */

@Controller
@RequestMapping("/user")
public class UserController {

    @Autowired
    UserService userService;

    @GetMapping("/list")
    public String toUserListPage(Map<String,Object> map) {
        map.put("message", "Hello SSM module Sample!!!");
        map.put("userList", userService.getUserList());
        return "user/list";
    }

}

编写页面：

jsp代码：list.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: User-Dai
  Date: 2020/8/8
  Time: 10:12
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>用户列表</title>
</head>
<body>

<table width="100%" border="1px">

    <caption><h3>${message}</h3></caption>

    <thead>
        <tr>
            <th>编号</th>
            <th>名称</th>
            <th>密码</th>
            <th>状态</th>
            <th>标记删除</th>
        </tr>
    </thead>

    <tbody>
        <c:forEach items="${userList}" var="user">
            <tr>
                <td>${user.id}</td>
                <td>${user.name}</td>
                <td>${user.password}</td>
                <td>${user.status}</td>
                <td>${user.is_del}</td>
            </tr>
        </c:forEach>
    </tbody>

</table>

</body>
</html>

访问：

http://localhost:8080/user/list