ssm框架搭建(分模块搭建)

最新推荐文章于 2021-07-24 01:50:29 发布

奋斗的小巍

最新推荐文章于 2021-07-24 01:50:29 发布

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分类专栏： ssm框架文章标签： ssm搭建分模块搭建ssm工程

本文链接：https://blog.youkuaiyun.com/wangwei_620/article/details/84324040

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本文详细介绍如何使用Spring、SpringMVC和MyBatis（SSM）框架进行模块化项目搭建，包括父工程创建、子模块划分、依赖管理、DAO层、Service层、Web层的配置及测试。

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一、拆分的思想

我们知道一个大的项目可能有好多个模块，如果做成一个可能不好管理，也不好维护，为此我们开始分模块开发一个项目，首先我们通过maven创建一个父工程，整个工程不用放任何代码，只提供jar管理。

parent 父工程
dao
service
web

引入依赖方式统一使用父工程的坐标引入所有子模块继承使用
依赖的作用范围 scope 节点
compile 默认任意情况生效
test 测试范围生效
provide 支持范围编译测试生效运行上线不生效
runtime 编译不需要测试运行需要

二、代码实现

1、首先我们创建一个parent工程

删除src，添加pom.xml中统一管理坐标

<packaging>pom</packaging>
    <!--添加jar包坐标，同一管理-->
    <properties>
        <spring.version>5.0.2.RELEASE</spring.version>
        <springmvc.version>5.0.2.RELEASE</springmvc.version>
        <mybatis.version>3.4.5</mybatis.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <!-- Mybatis -->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>${mybatis.version}</version>
            </dependency>
            <!-- springMVC -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${springmvc.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <!-- spring -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aop</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-expression</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-beans</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aspects</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context-support</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-tx</artifactId>
                <version>${spring.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <!-- Mybatis和mybatis与spring的整合 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!-- MySql驱动 -->
        <!-- druid数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.9</version>
        </dependency>
        <!-- springMVC核心 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
        </dependency> <!-- spring相关 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
        </dependency> <!-- junit测试 -->

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency> <!-- jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.29</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <target>1.8</target>
                    <source>1.8</source>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
            </plugin>
        </plugins>
    </build>

2.准备数据库，并且创建dao层工程，在这我们把domain层合并到dao层中创建实体类User

代码 dao接口 domain实体类
   配置文件 myBatis的sqlMapConfig.xml ---可以省略
   ssm整合后被spring的
   applicationContext.xml
   数据源 dataSource
   接口扫描类 MapperScaner
session工厂 sessionFactory

public class User implements Serializable {
    private Integer id;
    private String name;
    private Integer age;
实现getset方法，tostring方法

创建IUserDao接口

public interface IUserDao {
    /**
     * 查找所有人
     */
    public List<User> findAll();
    /**
     * 通过id找
     */
    public User findById(Integer id);
}

创建applicationContext-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">

    <!--读取properties文件-->
    <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>
    <!--添加数据源-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    <!--配置session工厂-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <!--配置别名-->
        <property name="typeAliasesPackage" value="com.itheima.domain"></property>
    </bean>
    <!--mapper接口扫描类-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.itheima.dao"></property>
    </bean>
</beans>

jdbc.properties文件

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///ssm01
jdbc.username=root
jdbc.password=root

编写对应的IUserDao.xml文件，主要包要和接口一致

<?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.itheima.dao.IUserDao">
    <!--查找所有-->
    <select id="findAll" resultType="user">
        select * from user ;
    </select>
    <!--通过id查找-->
    <select id="findById" resultType="user" parameterType="int">
        select * from user where id = #{id} ;
    </select>
</mapper>

编写测试类，测试是否成功

public class testDao {
    @Test
    public void testDao(){
        //创建容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("classpath*:applicationContext-dao.xml");
        //创建代理类
        IUserDao userDao = ac.getBean(IUserDao.class);
        //测试方法
        List<User> users = userDao.findAll();
        for (User user : users) {
            System.out.println(user);
        }
        System.out.println("================");
        System.out.println(userDao.findById(1));
    }
}

3.搭建service模块

代码业务类接口业务类实现
配置文件 applicationContext.xml
包扫描 context:component-scan 扫描自定义业务实现类管理
事务管理器 transactionManager
事务的通知 tx:Advice
aop切面配置 aop:config

编写接口和是实现类--接口方法与dao的一样

@Service
public class IUserServiceImpl implements IUserService {
    @Autowired
    private IUserDao userDao;
    @Override
    public List<User> findAll() {
        return userDao.findAll();
    }

    @Override
    public User findById(Integer id) {
        return userDao.findById(id);
    }
}

编写applicationContext-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: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 http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--导入dao配置文件-->
    <import resource="classpath*:applicationContext-dao.xml"></import>
    <!--配置service包扫描-->
    <context:component-scan base-package="com.itheima.service"></context:component-scan>
    <!--配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!--配置事物的通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <!--事物的属性-->
        <tx:attributes>
            <tx:method name="find*" read-only="true" propagation="SUPPORTS"/>
            <tx:method name="save*" read-only="false" propagation="REQUIRED"/>
            <tx:method name="update*" read-only="false" propagation="REQUIRED"/>
            <tx:method name="delete*" read-only="false" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>
    <!--配置事物与切点表达式关系-->
    <aop:config>
        <!--配置切点表达式-->
        <aop:pointcut id="pt1" expression="execution(* com.itheima.service.*.*(..))"></aop:pointcut>
        <!--配置事物与切点表达式的关系-->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pt1"></aop:advisor>
    </aop:config>
</beans>

注意上面的文件一定要导入applicaitonContext-dao.xml文件

测试也没有问题

5.常见web模块

代码接受请求出来的动作类 controller
配置文件
springMvc.xml
扫描动作类的包路径
视图解析器
mvc注解驱动 mvc:annotation-driven
静态资源放行本质是静态资源文件不需要交给springMvc处理

编写controller动作类方法

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

    @Autowired
    private IUserService userService;
    //查找所有人
    @RequestMapping("findAll")
    public String findAll(Model model){
        List<User> users = userService.findAll();
        model.addAttribute("users",users);
        return "users";
    }
    //查找单个人
    @RequestMapping("findById")
    public String findById(Integer id,Model model){
        User user = userService.findById(id);
        model.addAttribute("user",user);
        return "user";
    }
}

编写web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://java.sun.com/xml/ns/javaee"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         id="WebApp_ID" version="3.0">

    <!--配置核心前端控制器-->
    <servlet>
        <servlet-name>springMVCDispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--配置springmvc-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath*:springmvc.xml</param-value>
        </init-param>
        <!--服务启动加载-->
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!--映射器-->
    <servlet-mapping>
        <servlet-name>springMVCDispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!--添加监听器-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!--修改加载application的位置-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:applicationContext-service.xml</param-value>
    </context-param>
    <!--配置编码过滤器-->
    <filter>
        <filter-name>characterEncodingFilter</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>
    </filter>
    <!--filter映射-->
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:comtext="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/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!--配置扫描包-->
    <context:component-scan base-package="com.itheima.controller"></context:component-scan>
    <!--核心前端控制器-->
    <bean id="resourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    <!--去除静态资源的过滤-->
    <!--开启注解扫描-->
    <mvc:default-servlet-handler></mvc:default-servlet-handler>
    <mvc:annotation-driven></mvc:annotation-driven>
</beans>

编写测试页面

users.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>员工列表</title>
</head>
<body>
    ${users}
</body>
</html>
user.jsp页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>员工列表</title>
</head>
<body>
    ${user}
</body>
</html>