快速学习-SSM 整合

cwl_java

发布于 2020-04-08 11:27:27

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发布于 2020-04-08 11:27:27

文章被收录于专栏：cwl_Java

第1章 SSM 整合

1.1 环境准备

1.1.1 创建数据库和表结构

create database ssm;
	create table account(
	id int primary key auto_increment,
	name varchar(100),
	money double(7,2),
);

1.1.2 创建 Maven 工程

创建父工程：

创建子模块：

ssm_domain jar
ssm_dao jar
ssm_service jar
ssm_web war

1.1.3 导入坐标并建立依赖

注意 MyBatis 和 Spring 的版本对应关系：

<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>4.0.0</modelVersion>
    <groupId>com.itheima</groupId>
    <artifactId>ssm</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>
    <properties>
        <spring.version>5.0.2.RELEASE</spring.version>
        <slf4j.version>1.6.6</slf4j.version>
        <log4j.version>1.2.12</log4j.version>
        <shiro.version>1.2.3</shiro.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-context-support</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-orm</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-core</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-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</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>
    <build>
        <finalName>ssm</finalName>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.2</version>
                    <configuration>
                        <source>1.8</source>
                        <target>1.8</target>
                        <encoding>UTF-8</encoding>
                        <showWarnings>true</showWarnings>
                    </configuration>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
    <modules>
        <module>ssm_domain</module>
        <module>ssm_dao</module>
        <module>ssm_service</module>
        <module>ssm_web</module>
    </modules>
</project>

1.1.4 编写实体类

public class Account implements Serializable {
	private Integer id;
	private String name;
	private Float money;
	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 Float getMoney() {
		return money;
	}
	public void setMoney(Float money) {
		this.money = money;
	}
	@Override
	public String toString() {
		return "Account [id=" + id + ", name=" + name + ", money=" + money + "]";
	}
}

1.1.5 编写业务层接口

public interface IAccountService {
	/**
	 * 保存账户
	 * @param account
	 */
	void saveAccount(Account account);
	/**
	 * 查询所有账户
	 * @return
	 */
	List < Account > findAllAccount();
}

1.1.6 编写持久层接口

public interface IAccountDao {
	/**
	 * 保存
	 * @param account
	 */
	void save(Account account);
	/**
	 * 查询所有
	 * @return
	 */
	List < Account > findAll();
}

1.2 整合步骤

1.2.1 保证 Spring 框架在 web 工程中独立运行

1.2.1.1 第一步：编写 spring 配置文件并导入约束

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
 http://www.springframework.org/schema/beans/spring-beans.xsdhttp://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
 http://www.springframework.org/schema/context
 http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 配置 spring 创建容器时要扫描的包 -->
    <context:component-scan base-package="com.itheima">
        <!--制定扫包规则，不扫描@Controller 注解的 JAVA 类，其他的还是要扫描 -->
        <context:exclude-filter type="annotation"
expression="org.springframework.stereotype.Controller" />
    </context:component-scan>
</beans>

1.2.1.2 第二步：使用注解配置业务层和持久层

/**
 * 账户的业务层实现类
 */
@Service("accountService")
public class AccountServiceImpl implements IAccountService {
	@Autowired
	private IAccountDao accountDao;
	@Override
	public List < Account > findAllAccount() {
		return accountDao.findAllAccount();
	}
	@Override
	public void saveAccount(Account account) {
		accountDao.saveAccount
	}
}

持久层实现类代码： 此时不要做任何操作，就输出一句话。目的是测试 spring 框架搭建的结果。

/**
 * 账户的持久层实现类
 */
@Repository("accountDao")
public class AccountDaoImpl implements IAccountDao {
	@Override
	public List < Account > findAllAccount() {
		System.out.println("查询了所有账户");
		return null;
	}
	@Override
	public void saveAccount(Account account) {
		System.out.println("保存了账户");
	}
}

1.2.1.3 第三步：测试 spring 能否独立运行

public class Test01Spring {
	public static void main(String[] args) {
		ApplicationContext ac = new
		ClassPathXmlApplicationContext("applicationContext.xml");
		IAccountService as = ac.getBean("accountService", IAccountService.class);
		as.findAllAccount();
	}
}

运行结果：

1.2.2 保证 SpringMVC 在 web 工程中独立运行

1.2.2.1 第一步：在 web.xml 中配置核心控制器（DispatcherServlet）

<?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_2_5.xsd"
version="2.5">
    <display-name>ssm_web</display-name>
    <!-- 配置 spring mvc 的核心控制器 -->
    <servlet>
        <servlet-name>springmvcDispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 配置初始化参数，用于读取 springmvc 的配置文件 -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <!-- 配置 servlet 的对象的创建时间点：应用加载时创建。取值只能是非 0 正整数，表示启动顺
序 -->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvcDispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!-- 配置 springMVC 编码过滤器 -->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter
        </filter-cla
ss>
        <!-- 设置过滤器中的属性值 -->
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <!-- 启动过滤器 -->
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <!-- 过滤所有请求 -->
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
    </welcome-file-list>
</web-app>

1.2.2.2 第二步：编写 SpringMVC 的配置文件

<?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">
    <!-- 配置创建 spring 容器要扫描的包 -->
    <context:component-scan base-package="com.itheima">
        <!-- 制定扫包规则 ,只扫描使用@Controller 注解的 JAVA 类 -->
        <context:include-filter type="annotation"
expression="org.springframework.stereotype.Controller" />
    </context:component-scan>
    <!-- 配置视图解析器 -->
    <bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    <mvc:annotation-driven></mvc:annotation-driven>
</beans>

1.2.2.3 第三步：编写 Controller 和 jsp 页面

jsp 代码：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"
%>
	<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
	<html>
		<head>
			<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
			<title>
				主页
			</title>
		</head>
		<body>
			<a href="account/findAllAccount">
				访问查询账户
			</a>
		</body>
	
	</html>

控制器代码

@Controller("accountController")
@RequestMapping("/account")
public class AccountController {
	@RequestMapping("/findAllAccount")
	public String findAllAccount() {
		System.out.println("执行了查询账户");
		return "success";
	}
}

运行结果

1.2.3 整合 Spring 和 SpringMVC

1.2.3.1 第一步：配置监听器实现启动服务创建容器

<!-- 配置 spring 提供的监听器，用于启动服务时加载容器 。
该间监听器只能加载 WEB-INF 目录中名称为 applicationContext.xml 的配置文件 -->
<listener>
    <listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<!-- 手动指定 spring 配置文件位置 -->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
</context-param>

1.2.4 保证 MyBatis 框架在 web 工程中独立运行

1.2.4.1 第一步：编写 AccountDao 映射配置文件

注意：我们使用代理 dao 的方式来操作持久层，所以此处 Dao 的实现类就是多余的了。

<?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.IAccountDao">
    <!-- 查询所有账户 -->
    <select id="findAll" resultType="com.itheima.domain.Account">
select * from account
</select>
    <!-- 新增账户 -->
    <insert id="save" parameterType="com.itheima.domain.Account">
insert into account(name,money) values(#{name},#{money});
</insert>
</mapper>

1.2.4.2 第二步：编写 SqlMapConfig 配置文件

<?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>
    <properties resource="jdbcConfig.properties"></properties>
    <environments default="mysql">
        <environment id="mysql">
            <transactionManager type="JDBC"></transactionManager>
            <dataSource type="pooled">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/itheima/dao/AccountDao.xml"/>
    </mappers>
</configuration>

properties文件中的内容

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm
jdbc.username=root
jdbc.password=1234

1.2.4.3 第三步：测试运行结果

public class Test02MyBatis {
	/**
	 * 测试保存
	 * @param args
	 * @throws Exception
	 */
	@Test
	public void testSave() throws Exception {
		Account account = new Account();
		account.setName("test");
		account.setMoney(5000 f);
		InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
		SqlSessionFactory factory = new SqlSessionFactoryBuilder().build( in );
		SqlSession session = factory.openSession();
		IAccountDao aDao = session.getMapper(IAccountDao.class);
		aDao.save(account);
		session.commit();
		session.close(); in .close();
	}
	/**
	 * 测试查询
	 * @param args
	 * @throws Exception
	 */
	@Test
	public void testFindAll() throws Exception {
		InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
		SqlSessionFactory factory = new SqlSessionFactoryBuilder().build( in );
		SqlSession session = factory.openSession();
		IAccountDao aDao = session.getMapper(IAccountDao.class);
		List < Account > list = aDao.findAll();
		System.out.println(list);
		session.close(); in .close();
	}
}

1.2.5 整合 Spring 和 MyBatis

整合思路： 把 mybatis 配置文件（SqlMapConfig.xml）中内容配置到 spring 配置文件中同时，把 mybatis 配置文件的内容清掉。

<?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>

注意： 由于我们使用的是代理 Dao 的模式，Dao 具体实现类由 MyBatis 使用代理方式创建，所以此时 mybatis配置文件不能删。 当我们整合 spring 和 mybatis 时，mybatis 创建的 Mapper.xml 文件名必须和 Dao 接口文件名一致

1.2.5.1 第一步：Spring 接管 MyBatis 的 Session 工厂

<!-- 加载配置文件 -->
<context:property-placeholder location="classpath:jdbcConfig.properties" />
<!-- 配置 MyBatis 的 Session 工厂 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <!-- 数据库连接池 -->
    <property name="dataSource" ref="dataSource" />
    <!-- 加载 mybatis 的全局配置文件 -->
    <property name="configLocation" value="classpath:SqlMapConfig.xml" />
</bean>
<!-- 配置数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="${jdbc.driver}"></property>
    <property name="jdbcUrl" value="${jdbc.url}"></property>
    <property name="user" value="${jdbc.username}"></property>
    <property name="password" value="${jdbc.password}"></property>
</bean>

1.2.5.2 第二步：配置自动扫描所有 Mapper 接口和文件

<!-- 配置 Mapper 扫描器 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.itheima.dao"/>
</bean>

1.2.5.3 第三步：配置 spring 的事务

<!-- 配置事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 配置事务的通知 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
    <tx:attributes>
        <tx:method name="*" propagation="REQUIRED" read-only="false"/>
        <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
    </tx:attributes>
</tx:advice>
<!-- 配置 aop -->
<aop:config>
    <!-- 配置切入点表达式 -->
    <aop:pointcut expression="execution(* com.itheima.service.impl.*.*(..))"
id="pt1"/>
    <!-- 建立通知和切入点表达式的关系 -->
    <aop:advisor advice-ref="txAdvice" pointcut-ref="pt1"/>
</aop:config>

1.2.5.4 第三步：测试整合结果

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {
	"classpath:applicationContext.xml"
})
public class Test03SpringMabatis {
	@Autowired
	private IAccountService accountService;
	@Test
	public void testFindAll() {
		List list = accountService.findAllAccount();
		System.out.println(list);
	}
	@Test
	public void testSave() {
		Account account = new Account();
		account.setName("测试账号");
		account.setMoney(1234 f);
		accountService.saveAccount(account);
	}
}

1.2.6 测试 SSM 整合结果

1.2.6.1 编写测试 jsp

请求发起页面：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"
%>
	<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
	<html>
		<head>
			<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
			<title>
				主页
			</title>
		</head>
		<body>
			<a href="account/findAllAccount">
				访问查询账户
			</a>
			<hr/>
			<form action="account/saveAccount" method="post">
				账户名称：
				<input type="text" name="name" />
				<br/>
				账户金额：
				<input type="text" name="money">
				<br/>
				<input type="submit" value="保存" />
			</form>
		</body>
	
	</html>

响应结果页面

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"
%>
	<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
		<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
		<html>
			<head>
				<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
				<title>
					账户的列表页面
				</title>
			</head>
			<body>
				<table border="1" width="300px">
					<tr>
						<th>
							编号
						</th>
						<th>
							账户名称
						</th>
						<th>
							账户金额
						</th>
					</tr>
					<c:forEach items="${accounts}" var="account" varStatus="vs">
						<tr>
							<td>
								${vs.count}
							</td>
							<td>
								${account.name }
							</td>
							<td>
								${account.money }
							</td>
						</tr>
					</c:forEach>
				</table>
			</body>
		
		</html>

1.2.6.2 修改控制器中的方法

@Controller("accountController")
@RequestMapping("/account")
public class AccountController {
	@Autowired
	private IAccountService accountService;
	/**
	 * 查询所有账户
	 * @return
	 */
	@RequestMapping("/findAllAccount")
	public ModelAndView findAllAccount() {
		List < Account > accounts = accountService.findAllAccount();
		ModelAndView mv = new ModelAndView();
		mv.addObject("accounts", accounts);
		mv.setViewName("accountlist");
		return mv;
	}
	/**
	 * 保存账户
	 * @param account
	 * @return
	 */
	@RequestMapping("/saveAccount")
	public String saveAccount(Account account) {
		accountService.saveAccount(account);
		return "redirect:findAllAccount";
	}
}