JAVA SSM整合流程以及注意点

1、搭建整合环境

      整合说明：SSM整合可以使用多种方式，咱们会选择XML + 注解的方式

•  先搭建整合的环境
•  先把Spring的配置搭建完成
•  再使用Spring整合SpringMVC框架
•  最后使用Spring整合MyBatis框架
•  创建数据库和表结构

4. 创建maven的工程（中间选择骨架时用到的键值对

archetypeCatalog
internal

）

1.  创建ssm_parent父工程（打包方式选择pom，必须的）
2. 创建ssm_web子模块（打包方式是war包）
3.  创建ssm_service子模块（打包方式是jar包）
4.  创建ssm_dao子模块（打包方式是jar包）
5. 创建ssm_domain子模块（打包方式是jar包）
6.  web依赖于service，service依赖于dao，dao依赖于domain
7. 在ssm_parent的pom.xml文件中引入坐标依赖

 <properties>
    <spring.version>5.0.2.RELEASE</spring.version>
    <slf4j.version>1.6.6</slf4j.version>
    <log4j.version>1.2.12</log4j.version>
    <mysql.version>5.1.6</mysql.version>
    <mybatis.version>3.4.5</mybatis.version>
  </properties>

　　

<dependencies>
    <!-- spring -->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.6.8</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql.version}</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.0</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <!-- log start -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>${log4j.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <!-- log end -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.0</version>
    </dependency>
    <dependency>
      <groupId>c3p0</groupId>
      <artifactId>c3p0</artifactId>
      <version>0.9.1.2</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
  </dependencies>

　5、依次编写实体类dao（接口，@Repository，将来连接数据库）、domain（bean实体类，与数据库对应）、service（里面有不同的实现类，@Service("accountService")

实现接口方法），此时Service中不去连接数据库，方便检测Spring模块完好情况

　编写TestSpring类检测Spring模块是否正常运行

import com.courage.service.AccountService;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestSpring {
    @Test
    public void run1() {

        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        AccountService accountService = (AccountService) context.getBean("accountService");
        accountService.findAll();
    }
}

上面一步完好之后，开始编写SpringMVC模块，即web.xml,Springmvc.xml,Controller.java

web.xml
<!--//前端控制器-->
    <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:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!--//前端过滤器-->
    <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-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

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:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       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">


    <!--扫包-->
    <context:component-scan base-package="com.courage">
        <context:include-filter type="annotation"
                                expression="org.springframework.stereotype.Controller"></context:include-filter>
    </context:component-scan>
    <!--配置视图解析器-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    <!--过滤静态资源-->
    <mvc:resources mapping="/css/**" location="/css/"></mvc:resources>
    <mvc:resources mapping="/js/**" location="/js/"></mvc:resources>
    <mvc:resources mapping="/images/**" location="/images/"></mvc:resources>
    <!--开启mvc注解扫描-->
    <mvc:annotation-driven></mvc:annotation-driven>
</beans>

Controller.java

@Controller
@RequestMapping("/account")
public class AccountController {
    @Autowired
    private AccountService accountService;
    @RequestMapping("/findAll")
    public String findAll(Model model){
       
        System.out.println("表现层传数据");
        return "list";
    }

WEB-INF下创建pages文件夹再创建list.jsp

部署tomcat，启动

成功之后整合Spring和SpringMVC，由于tomcat启动时依次扫描的是web.xml--->Springmvc.xml,全程都没有加载Spring的applicationContext.xml文件，而整合时需要将其加入容器中，因此设置监听器，步骤：

需要导入spring-web这个jar包,因为默认只扫描Resourse目录，所以要context-param指定实际目录

在SpringMVC的web.xml文件中加入下列监听器代码：

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>

此后applicationContext.xml会被加入到容器中

此时在Controller中注解

@Autowired
private AccountService accountService;

同时，调用

accountService.findAll()方法

在Service中注解

    @Autowired
    private AccountDao accountDao;

同时，调用accountDao.findAll()方法

若通过Controller层可以连接到Service --> dao层，则可以开始部署Mybatis层连接数据库



先保证Mybatis模块可以正常运行，配置步骤：
 1、在Resource路径下添加SqlMapConfig.xml文件，用来连接数据库

<?xml version="1.0" encoding="UTF-8"?>
<!--Mybatis是跟数据库对接，所以要创建连接数据库的配置文件-->
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <environments default="mysql">
        <environment id="mysql">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql:///ssm"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    <!-- 使用的是注解，引入配置文件 -->
    <mappers><!--映射-->
        <!-- <mapper class="com.courage.dao.AccountDao"/> -->
        <!-- 该包下所有的dao接口都可以使用,Mybatis根据接口创建实现类 -->
        <package name="com.courage.dao"/><!--默认这个包所有的文件都可以扫到-->
    </mappers>
</configuration>

　2、Mybatis测试类

     

public class TestMybatis {
    @Test
    public void run1() throws Exception {
        //获取配置文件
        InputStream asStream = Resources.getResourceAsStream("MySqlMapConfig.xml");
        //创建工厂对象SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(asStream);
        //工厂开始汇话
        SqlSession sqlSession = factory.openSession();
        //获取代理对象
        AccountDao dao = sqlSession.getMapper(AccountDao.class);
        //查询账户信息
        List<Account> list = dao.findAll();
        for (Account account : list) {
            System.out.println(account);
        }

        sqlSession.close();//关闭流
        asStream.close();

    }
}

成功后
整合部署Mybatis步骤：

1、在applicationContext.xml中补充连接池（连接数据库的四大要素、Mybatis工厂、Mapper）

<!--Spring整合Mybatis-->
  <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="com.mysql.jdbc.Driver"/>
    <property name="jdbcUrl" value="jdbc:mysql:///ssm"/>
    <property name="user" value="root"/>
    <property name="password" value="123456"/>
  </bean>
  <!--Mybatis工厂-->
  <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
    <!--//通过连接池（配置文件）连接数据库-->
    <property name="dataSource" ref="dataSource"></property>
  </bean>
  <!--Mybatis mapper-->
  <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.courage.dao"></property>
  </bean>


<!--配置Spring框架声明式事务管理-->
<!--配置事务管理器-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
  <property name="dataSource" ref="dataSource" />
</bean>

<!--配置事务通知-->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
  <tx:attributes>
    <tx:method name="find*" read-only="true"/>
    <tx:method name="*" isolation="DEFAULT"/>
  </tx:attributes>
</tx:advice>

<!--配置AOP增强-->
<aop:config>
  <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.courage.service.impl.*ServiceImpl.*(..))"/>
</aop:config>

其他步骤：

 在AccountDao接口中添加@Repository注解

在service中注入dao对象，进行测试