SSM整合 | 木瓜煲鸡脚's blog

1. 需求和步骤分析

需求

使用ssm框架完成对 account 表的增删改查操作。

步骤分析

准备数据库和表记录
创建web项目
编写mybatis在ssm环境中可以单独使用
编写spring在ssm环境中可以单独使用
spring整合mybatis
编写springMVC在ssm环境中可以单独使用
spring整合springMVC

2. 环境搭建

2.1 准备数据库和表记录

CREATE TABLE `account` ( 
    `id` int(11) NOT NULL AUTO_INCREMENT,     
    `name` varchar(32) DEFAULT NULL,
    `money` double DEFAULT NULL,
     PRIMARY KEY (`id`) 
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8; 

insert into `account`(`id`,`name`,`money`) 
values (1,'tom',1000), (2,'jerry',1000);

2.2 创建web项目

3. 编写mybatis在ssm环境中可以单独使用

需求：基于mybatis先来实现对account表的查询

3.1 相关坐标

<!--mybatis坐标-->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.47</version>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.15</version>
</dependency>
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.5.1</version>
</dependency>
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
</dependency>

3.2 Accoun实体

public class Account { 
    private Integer id; 
    private String name; 
    private Double money; 
}

3.3 AccountDao接口

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public interface AccountDao { 
    public List<Account> findAll(); 
}

3.4 AccountDao.xml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">
<mapper namespace="com.lagou.dao.AccountDao">
    <select id="findAll" resultType="Account"> select * from account </select>
</mapper>

3.5 mybatis核心配置文件

jdbc.properties

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

SqlMapConfig.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>
    <!--加载properties-->
    <properties resource="jdbc.properties"/>
    <!--类型别名配置-->
    <typeAliases>
        <package name="com.lagou.domain"/>
    </typeAliases>
    <!--环境配置-->
    <environments default="mysql">
        <!--使用MySQL环境-->
        <environment id="mysql">
            <transactionManager type="JDBC"/>
            <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>
    <!--加载映射-->
    <mappers>
        <package name="com.lagou.dao"/>
    </mappers>
</configuration>

3.6 测试代码

public class MyBatisTest {
	@Test 
	public void testMybatis() throws Exception {
		// 加载核心配置文件 
		InputStream is = Resources.getResourceAsStream("SqlMapConfig.xml");
		// 获得sqlsession工厂对象 
		SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
		// 获得sqlsession会话对象 
		SqlSession sqlSession = sqlSessionFactory.openSession();
		// 获得mapper代理对象 
		AccountDao accountDao = sqlSession.getMapper(AccountDao.class);
		// 执行 
		List<Account> list = accountDao.findAll();
		for (Account account : list) {
			System.out.println(account);
		}
		// 释放资源 
		sqlSession.close();
	}
}

4. 编写spring在ssm环境中可以单独使用

4.1 相关坐标

<!--spring坐标-->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.1.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.8.13</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>5.1.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-tx</artifactId>
    <version>5.1.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>5.1.5.RELEASE</version>
</dependency>

4.2 AccountService接口

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public interface AccountService { 
    public List<Account> findAll(); 
}

4.3 AccountServiceImpl实现

@Service 
public class AccountServiceImpl implements AccountService {
	@Override
	public List<Account> findAll() {
		System.out.println("findAll执行了....");
		return null;
	}
}

4.4 spring核心配置文件

applicationContext.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">
    
    <!--注解组件扫描-->
    <context:component-scan base-package="com.lagou.service"/>
    
</beans>

4.5 测试代码

@RunWith(SpringJUnit4ClassRunner.class) 
@ContextConfiguration("classpath:applicationContext.xml") 
public class SpringTest {
	@Autowired 
	private AccountService accountService;
	@Test 
	public void testSpring() throws Exception {
		List<Account> list = accountService.findAll();
		System.out.println(list);
	}
}

5. spring整合mybatis

5.1 整合思想

将mybatis接口代理对象的创建权交给spring管理，我们就可以把dao的代理对象注入到service中此时也就完成了spring与mybatis的整合了。

5.2 导入整合包

<!--mybatis整合spring坐标-->
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>1.3.1</version>
</dependency>

5.3 spring配置文件管理mybatis

注意：此时可以将mybatis主配置文件删除。

<?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">
    
    <!--注解组件扫描-->
    <context:component-scan base-package="com.lagou.service"/>
    <!--spring整合mybatis-->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
    <!--SqlSessionFactory创建交给spring的IOC容器-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--数据库环境配置-->
        <property name="dataSource" ref="dataSource"/>
        <!--类型别名配置-->
        <property name="typeAliasesPackage" value="com.lagou.domain"/>
        <!--如果要引入mybatis主配置文件，可以通过如下配置-->
        <!--<property name="configLocation" value="classpath:SqlMapConfig.xml"/>-->
    </bean>
    <!--映射接口扫描配置，由spring创建代理对象，交给IOC容器-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.lagou.dao"/>
    </bean>
</beans>

5.4 修改AccountServiceImpl

@Service 
public class AccountServiceImpl implements AccountService {
	@Autowired 
	private AccountDao accountDao;
	@Override 
	public List<Account> findAll() {
		return accountDao.findAll();
	}
}

6. 编写springMVC在ssm环境中可以单独使用

需求：访问到controller里面的方法查询所有账户，并跳转到list.jsp页面进行列表展示

6.1 相关坐标

<!--springMVC坐标-->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.1.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.1.0</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>jsp-api</artifactId>
    <version>2.2</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>jstl</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>

6.2 导入页面资源

6.3 前端控制器DispathcerServlet

<?xml version="1.0" encoding="UTF-8"?>
<web-app
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
    <!--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:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>2</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!--post中文处理-->
    <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>
</web-app>

6.4 AccountController和 list.jsp

@Controller 
@RequestMapping("/account") 
public class AccountController {
	@RequestMapping("/findAll") 
	public String findAll(Model model) {
		List<Account> list = new ArrayList<>();
		list.add(new Account(1,"张三",1000d));
		list.add(new Account(2,"李四",1000d));
		model.addAttribute("list", list);
		return "list";
	}
}

<c:forEach items="${list}" var="account">
	<tr>
		<td><input type="checkbox" name="ids"></td>
		<td>${account.id}</td>
		<td>${account.name}</td>
		<td>${account.money}</td>
		<td><a class="btn btn-default btn-sm" href="update.jsp">修改</a>&nbsp;
			<a class="btn btn-default btn-sm" href="">删除</a>
		</td>
	</tr>
</c:forEach>

6.5 springMVC核心配置文件

<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">
    
    <!--组件扫描-->
    <context:component-scan base-package="com.lagou.controller"/>
    <!--mvc注解增强-->
    <mvc:annotation-driven/>
    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--实现静态资源映射-->
    <mvc:default-servlet-handler/>
</beans>

7. spring整合springMVC

7.1 整合思想

spring和springMVC其实根本就不用整合，本来就是一家。

但是我们需要做到spring和web容器整合，让web容器启动的时候自动加载spring配置文件，web容器销毁的时候spring的ioc容器也销毁。

7.2 spring和web容器整合

ContextLoaderListener加载【掌握】

可以使用spring-web包中的ContextLoaderListener监听器，可以监听servletContext容器的创建和销毁，来同时创建或销毁IOC容器。

<!--spring 与 web容器整合-->
<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>

7.3 修改AccountController

@Controller
@RequestMapping("/account") 
public class AccountController {
	@Autowired 
	private AccountService accountService;
	@RequestMapping("/findAll") 
	public String findAll(Model model) {
		List<Account> list = accountService.findAll();
		model.addAttribute("list", list);
		return "list";
	}
}

8. spring配置声明式事务

8.1 spring配置文件加入声明式事务

<!--事务管理器-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
</bean>
<!--开启事务注解支持-->
<tx:annotation-driven/>

@Service 
@Transactional 
public class AccountServiceImpl implements AccountService {
}

8.2 add.jsp

<form action="${pageContext.request.contextPath}/account/save" method="post">
	<div class="form-group">
		<label for="name">姓名：</label>
		<input type="text" class="form-control" id="name" name="name" placeholder="请输入姓名">
	</div>
	<div class="form-group">
		<label for="age">余额：</label>
		<input type="text" class="form-control" id="age" name="age" placeholder="请输入余额">
	</div>
	<div class="form-group" style="text-align: center">
		<input class="btn btn-primary" type="submit" value="提交" />
		<input class="btn btn-default" type="reset" value="重置" />
		<input class="btn btn-default" type="button" onclick="history.go(-1)"
		value="返回" />
	</div>
</form>

8.3 AccountController

@RequestMapping("/save") 
public String save(Account account){ 
    accountService.save(account); 
    return "redirect:/account/findAll"; 
}

8.4 AccountService接口和实现类

1	public void save(Account account);

@Service 
@Transactional 
public class AccountServiceImpl implements AccountService {
	@Override 
	public void save(Account account) {
		accountDao.save(account);
	}
}

8.5 AccountDao

1	void save(Account account);

AccountDao.xml

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<insert id="save" parameterType="Account"> 
    insert into account (name, money) values (#{name}, #{money}) 
</insert>

9. 修改操作

9.1 数据回显

① AccountController

@RequestMapping("/findById") 
public String findById(Integer id, Model model) { 
    Account account = accountService.findById(id); 
    model.addAttribute("account", account); return "update"; 
}

② AccountService接口和实现类

1	Account findById(Integer id);

@Override 
public Account findById(Integer id) { 
    return accountDao.findById(id); 
}

③ AccountDao接口和映射文件

1	Account findById(Integer id);

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<select id="findById" parameterType="int" resultType="Account"> 
    select * from account where id = #{id} 
</select>

④ update.jsp

<form action="${pageContext.request.contextPath}/account/update" method="post">
	<input type="hidden" name="id" value="${account.id}">
	<div class="form-group">
		<label for="name">姓名：</label>
		<input type="text" class="form-control" id="name" name="name" value="${account.name}"
		placeholder="请输入姓名">
	</div>
	<div class="form-group">
		<label for="money">余额：</label>
		<input type="text" class="form-control" id="money" name="money" value="${account.money}"
		placeholder="请输入余额">
	</div>
	<div class="form-group" style="text-align: center">
		<input class="btn btn-primary" type="submit" value="提交" />
		<input class="btn btn-default" type="reset" value="重置" />
		<input class="btn btn-default" type="button" onclick="history.go(-1)"
		value="返回" />
	</div>
</form>

9.2 账户更新

① AccountController

@RequestMapping("/update") 
public String update(Account account){ 
    accountService.update(account); 
    return "redirect:/account/findAll"; 
}

② AccountService接口和实现类

1	void update(Account account);

@Override 
public void update(Account account) { 
    accountDao.update(account); 
}

③ AccountDao接口和映射文件

1	void update(Account account);

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<update id="update" parameterType="Account"> 
    update account set name = #{name},money = #{money} where id = #{id} 
</update>

10. 批量删除

10.1 list.jsp

<script>
	$('#checkAll').click(function() {
		$('input[name="ids"]').prop('checked', $(this).prop('checked'));
	}) $('#deleteBatchBtn').click(function() {
		if (confirm('您确定要删除吗?')) {
			if ($('input[name="ids"]:checked').length > 0) {
				$('#deleteBatchForm').submit();
			} else {
				alert('想啥呢？')
			}
		}
	})
</script>

10.2 AccountController

@RequestMapping("/deleteBatch") 
public String deleteBatch(Integer[] ids) { 
    accountService.deleteBatch(ids); 
    return "redirect:/account/findAll"; 
}

10.3 AccountService接口和实现类

1	void deleteBatch(Integer[] ids);

@Override 
public void deleteBatch(Integer[] ids) { 
    accountDao.deleteBatch(ids); 
}

10.4 AccountDao接口和映射文件

1	void deleteBatch(Integer[] ids);

<delete id="deleteBatch" parameterType="int"> delete from account 
    <where>
        <foreach collection="array" open="id in(" close=")" separator="," item="id"> #{id} </foreach>
    </where>
</delete>