JavaEE：SSM整合(Spring+SpringMVC+MyBatis)

說明：

簡稱SSM，Spring+SpringMVC+MyBatis

Spring依賴：
spring-core-x.x.x.RELEASE.jar、asm-x.x.jar、cglib-x.x.x.jar、spring-context-x.x.x.RELEASE.jar、spring-beans-x.x.x.RELEASE.jar、spring-expression-x.x.x.RELEASE.jar、spring-tx-x.x.x.RELEASE.jar、spring-aop-x.x.x.RELEASE.jar、spring-aspects-x.x.x.RELEASE.jar、spring-jdbc-x.x.x.RELEASE.jar
AspecjJ依賴jar包：
aspectjweaver-x.x.x.jar、aopalliance-x.x.jar

SpringMVC依賴：
spring-web-x.x.x.RELEASE.jar、spring-webmvc-x.x.x.RELEASE.jar

MyBatis依賴：
mybatis-x.x.x.jar、mybatis-spring-x.x.x.jar、ant-x.x.x.jar、ant-launcher-x.x.x.jar、asm-x.x.jar、cglib-x.x.xx.jar、、javassist-x.x.x-GA.jar、log4j-x.x.x.jar、log4j-api-x.x.x.jar、log4j-core-x.x.x.jar、ognl-x.x.x.jar、slf4j-api-x.x.x.jar、slf4j-log4j12-x.x.x.jar

其他依賴包：
MySql驅動包：mysql-connector-java-x.x.x.jar
Druid依賴(數據源)：druid-x.x.x.jar
日誌：commons-logging-x.x.jar
json依賴：jackson-annotations-x.x.x.jar、jackson-core-x.x.x.jar、jackson-databind-x.x.x.jar
jsp依賴：jsp-api.jar

一、MyBatis配置：

1.創建mybatis-config.xml，configuration中爲空：

<?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>
</configuration>

2.創建dao接口類：

//dao層，操作數據庫增刪改查
public interface UserMapper {
	public User query(String userNo); // 按userNo查詢User
}

3.創建UserMapper.xml，配置dao接口對應的映射：

<?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">
<!-- UserMapper爲User的dao接口 -->
<mapper namespace="com.yyh.hkw.dao.UserMapper">
	<!-- 查詢User數據 ，parameterType爲參數類型，resultType爲返回值類型 -->
	<select id="query" parameterType="string" resultType="com.yyh.hkw.domain.User">
		select * from user where userNo=#{userNo}
	</select>
</mapper>

4.創建實體類User.java:

public class User {
	private String name;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}

二、Spring配置：

1.創建jdbc.properties，配置數據庫信息：

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mydb?serverTimezone=UTC
jdbc.username=root
jdbc.password=root

2.創建spring-config.xml，配置數據源、SqlSessionFactory、Dao動態代理(dao包掃描)、事務管理器、service層包掃描：

<?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:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd
    	http://www.springframework.org/schema/tx
		http://www.springframework.org/schema/tx/spring-tx.xsd">

	<!-- 一、 配置數據源 -->
	<!-- (1)導入jdbc.properties -->
	<context:property-placeholder location="classpath:jdbc.properties" />
	<!-- (2)配置Druid數據源 -->
	<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
		<property name="driverClassName" value="${jdbc.driver}" /><!-- 獲取jdbc.properties中的值 -->
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
	</bean>

	<!-- 二、配置SqlSessionFactory -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<!-- 設置數據源，ref值爲上面配的數據源 -->
		<property name="dataSource" ref="dataSource" />
		<!-- 加載mybatis-config.xml -->
		<property name="configLocation" value="classpath:mybatis-config.xml" />
	</bean>

	<!-- 三、Dao動態代理配置，dao包掃描，自動創建實例 -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="com.yyh.hkw.dao" />
	</bean>

	<!-- 四、配置事務管理器 -->
	<!-- (1)爲事務賦值數據源 -->
	<bean id="tm" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<!-- ref值爲上面配的連接池 -->
		<property name="dataSource" ref="dataSource" />
	</bean>
	<!-- (2)，配置通知，以下方法需要被事務管理，tm爲上面自定義名 -->
	<tx:advice id="adviceRef" transaction-manager="tm">
		<tx:attributes>
			<!-- 配置相應方法的傳播行爲 -->
			<tx:method name="insert*" propagation="REQUIRED" />
			<tx:method name="query*" propagation="SUPPORTS" read-only="true" />
		</tx:attributes>
	</tx:advice>
	<!--(3)配置切面，使用事務增強service包所有類的所有方法 -->
	<aop:config>
		<!-- adviceRef爲上面自定義名，配置表達式，增強service包所有類的所有方法；第1* 表示任意返回值，..表示方法有任意個參數； -->
		<aop:advisor advice-ref="adviceRef" pointcut="execution(* com.yyh.hkw.service.*.*(..))" />
	</aop:config>

	<!-- 五、配置service層包掃描，自動創建實例 -->
	<context:component-scan base-package="com.yyh.hkw.service" />
</beans>

3.配置Tomcat啓動時自動加載spring-config.xml文件，web.xml中：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" metadata-complete="true" version="4.0">
	<!-- 一、spring配置：加載spring-config.xml文件，ContextLoaderListener類會自動加載 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
        <!-- 如果不在src目錄下，需要配成classpath*:spring-config.xml -->
		<param-value>classpath:spring-config.xml</param-value>
	</context-param>
	<!-- spring配置：啓動服務器時調用contextInitialized，停止服務器時調用contextDestroyed。 -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	...
</web-app>

4.創建service層類UserService.java，調用dao接口實現增刪改查：

//service層，操作dao層增刪改查
@Service
public class UserService {
	@Autowired //對象類型注入，自動實例化
	private UserMapper mUserDao;
	// 按userNo查詢User
	public User getUserDetail(String userNo) {
		return mUserDao.query(userNo);
	}
}

三、SpringMVC配置：

1.創建springmvc-config.xml，配置包掃描、註解驅動、路徑前/後綴：

<?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 
	https://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">

	<!-- 一、配置包掃描，自動實例化control包下所有類 -->
	<context:component-scan base-package="com.yyh.hkw.control" />

	<!-- 二、配置註解驅動，等同於配置映射器+適配器，處理請求路徑到方法的調用 -->
	<mvc:annotation-driven />

	<!-- 三、配置路徑前/後綴，在跳轉時可省略前/後綴 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/jsp/" />
		<property name="suffix" value=".jsp" />
	</bean>
</beans>

2.配置攔截.action的請求路徑，自動加載springmvc-config.xml文件，web.xml中：

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" metadata-complete="true" version="4.0">
	...
	<!-- 二、springmvc配置：配置攔截.action的請求路徑 -->
	<servlet>
		<servlet-name>DispatcherServlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<!-- 加載springmvc-config.xml文件 -->
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:springmvc-config.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>DispatcherServlet</servlet-name>
		<url-pattern>*.action</url-pattern>
	</servlet-mapping>
</web-app>

3.創建control層類UserControl.java，調用service層實現增刪改查：

//@Controller配置當前類爲頁面求處理類
@Controller
public class UserControl {
	@Autowired // 對象類型注入，自動實例化
	private UserService mUserService;

	@RequestMapping("userDetail")
	public String userDetail(String userNo, Model model) {
		System.out.println("userDetail userNo: " + userNo);
		User user = mUserService.getUserDetail(userNo);
		model.addAttribute("user", user); // 將值傳給頁面
		return "user_detail"; // 跳user_detail.jsp界面
	}
}