SSM(Spring-MyBatis-SpringMVC)框架整合【完整版】
2021-11-28 18:07
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整合SSM
01 基本配置文件的关系
web.xml配置DispatcherServlet
02 需要的maven依赖
<!--依赖 1、junit 2、数据库连接池 3、servlet 4、jsp 5、mybatis 6、mybatis-spring 7、spring --> <dependencies> <!--log4j--> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <!--lombok插件--> <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.16.10</version> </dependency> <!--Junit--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <!--数据库驱动--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.47</version> </dependency> <!-- 数据库连接池 --> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.2</version> </dependency> <!--Servlet - JSP --> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <!--Mybatis--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.2</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.2</version> </dependency> <!--Spring--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.1.9.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.1.9.RELEASE</version> </dependency> </dependencies> <!--资源过滤--> <build> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>false</filtering> </resource> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>false</filtering> </resource> </resources> </build>
一、spring整合mybatis配置
01 mybatis核心配置文件mybatis-config.xml
- 起别名
- 添加mapper映射
- 添加setting
<?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> <typeAliases> <package name="com.kuang.pojo"/> </typeAliases> <mappers> <mapper resource="com/kuang/dao/BookMapper.xml"/> </mappers> </configuration>
02 spring整合配置文件spring-dao.xml
- 关联数据库配置信息,配置连接池
- 配置SqlSessionFactory对象
- 配置扫描Dao接口包,动态实现Dao接口注入到spring容器中
<?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 https://www.springframework.org/schema/context/spring-context.xsd"> <!-- 配置整合mybatis --> <!-- 1.关联数据库文件 --> <context:property-placeholder location="classpath:database.properties"/> <!-- 2.数据库连接池 --> <!--数据库连接池 dbcp 半自动化操作 不能自动连接 c3p0 自动化操作(自动的加载配置文件 并且设置到对象里面) --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <!-- 配置连接池属性 --> <property name="driverClass" value="${jdbc.driver}"/> <property name="jdbcUrl" value="${jdbc.url}"/> <property name="user" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> <!-- c3p0连接池的私有属性 --> <property name="maxPoolSize" value="30"/> <property name="minPoolSize" value="10"/> <!-- 关闭连接后不自动commit --> <property name="autoCommitOnClose" value="false"/> <!-- 获取连接超时时间 --> <property name="checkoutTimeout" value="10000"/> <!-- 当获取连接失败重试次数 --> <property name="acquireRetryAttempts" value="2"/> </bean> <!-- 3.配置SqlSessionFactory对象 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 注入数据库连接池 --> <property name="dataSource" ref="dataSource"/> <!-- 配置MyBaties全局配置文件:mybatis-config.xml --> <property name="configLocation" value="classpath:mybatis-config.xml"/> </bean> <!-- 4.配置扫描Dao接口包,动态实现Dao接口注入到spring容器中 --> <!--解释 : https://www.cnblogs.com/jpfss/p/7799806.html--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 注入sqlSessionFactory --> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> <!-- 给出需要扫描Dao接口包 --> <property name="basePackage" value="com.kuang.dao"/> </bean> </beans>
- 到这里dao层的数据获取部分已经配置完成,其中获取sqlSession的方式有所不同,之前有两种方式获取sqlSession对象:
- 利用构造器注入
package com.kuang.dao; import com.kuang.pojo.User; import org.mybatis.spring.SqlSessionTemplate; import java.util.List; public class UserMapperImpl implements UserMapper { //sqlSession不用我们自己创建了,Spring来管理 private SqlSessionTemplate sqlSession; public void setSqlSession(SqlSessionTemplate sqlSession) { this.sqlSession = sqlSession; } public List<User> selectUser() { UserMapper mapper = sqlSession.getMapper(UserMapper.class); return mapper.selectUser(); } }
<import resource="spring-dao.xml"></import> <!----> <bean id="userMapper" class="com.kuang.dao.UserMapperImpl"> <property name="sqlSession" ref="sqlSession"></property> </bean>
<!--注册sqlSessionTemplate , 关联sqlSessionFactory--> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"> <!--利用构造器注入--> <constructor-arg index="0" ref="sqlSessionFactory"/> </bean>
继承SqlSessionDaoSupport,直接使用getSqlSession().getMapper(UserMapper.class);获取
引用spring-dao.xml的sqlSessionFactory,代理生成sqlSession对象
<!--配置SqlSessionFactory--> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <!--关联Mybatis--> <property name="configLocation" value="classpath:mybatis-config.xml"/> <property name="mapperLocations" value="classpath:com/kuang/dao/*.xml"/> </bean>
package com.kuang.dao; import com.kuang.pojo.User; import org.mybatis.spring.support.SqlSessionDaoSupport; import java.util.List; public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper { public List<User> selectUser() { UserMapper mapper = getSqlSession().getMapper(UserMapper.class); return mapper.selectUser(); } }
<bean id="userMapper2" class="com.kuang.dao.UserMapperImpl2"> <property name="sqlSessionFactory" ref="sqlSessionFactory"></property> </bean>
- 现在配置的方法是最简单的,不需要再手动获取sqlSession对象,由Spring动态生成并执行sql语句!
二、spring-mybatis-springmvc
01 springmvc主要管理的是controller层和service层
- controller层主要负责决定要从dao层获取什么数据,还有这些数据要渲染到什么视图上。
- service层主要负责实现dao层的方法,定义一个新接口,这个接口里的方法来自dao层接口的方法,然后写一个Impl实现这个接口。
spring-mvc.xml整合controller层
- 开启注解支持
- 默认过滤静态资源
- 配置ViewResolver视图解析器
- 扫描controller层的bean完成注入
<?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 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/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 配置SpringMVC --> <!-- 1.开启SpringMVC注解驱动 --> <mvc:annotation-driven /> <!-- 2.静态资源默认servlet配置--> <mvc:default-servlet-handler/> <!-- 3.配置jsp 显示ViewResolver视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> <!-- 4.扫描web相关的bean --> <context:component-scan base-package="com.kuang.controller"/> </beans>
spring-service.xml整合service层
- 扫描service层的bean完成注入
- 把Impl实现方法注入到IOC容器,主要是给参数private BookMapper bookMapper 赋值
- 配置事务管理器
<?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"> <!-- 扫描service相关的bean --> <context:component-scan base-package="com.kuang.service" /> <!--BookServiceImpl注入到IOC容器中--> <bean id="BookServiceImpl" class="com.kuang.service.BookServiceImpl"> <property name="bookMapper" ref="bookMapper"/> </bean> <!-- 配置事务管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <!-- 注入数据库连接池 --> <property name="dataSource" ref="dataSource" /> </bean> </beans>
三、Spring配置整合文件,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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <import resource="spring-dao.xml"/> <import resource="spring-service.xml"/> <import resource="spring-mvc.xml"/> </beans>
四、补充service层的实现方法
package com.kuang.service; import com.kuang.dao.BookMapper; import com.kuang.pojo.Books; import java.util.List; public class BookServiceImpl implements BookService { //调用dao层的操作,设置一个set接口,方便Spring管理 private BookMapper bookMapper; public void setBookMapper(BookMapper bookMapper) { this.bookMapper = bookMapper; } public int addBook(Books book) { return bookMapper.addBook(book); } public int deleteBookById(int id) { return bookMapper.deleteBookById(id); } public int updateBook(Books books) { return bookMapper.updateBook(books); } public Books queryBookById(int id) { return bookMapper.queryBookById(id); } public List<Books> queryAllBook() { return bookMapper.queryAllBook(); } }
- //调用dao层的操作,设置一个set接口,方便Spring管理 private BookMapper bookMapper;
在spring-service.xml中的
<!--BookServiceImpl注入到IOC容器中 主要是给参数private BookMapper bookMapper;赋值--> <bean id="BookServiceImpl" class="com.kuang.service.BookServiceImpl"> <property name="bookMapper" ref="bookMapper"/> </bean>
五、补充controller层的方法
package com.kuang.controller; import com.kuang.pojo.Books; import com.kuang.service.BookService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import java.util.List; @Controller @RequestMapping("/book") public class BookController { @Autowired @Qualifier("BookServiceImpl") private BookService bookService; @RequestMapping("/allBook") public String list(Model model) { List<Books> list = bookService.queryAllBook(); model.addAttribute("list", list); return "allBook"; } @RequestMapping("/toAddBook") public String toAddPaper() { return "addBook"; } @RequestMapping("/addBook") public String addPaper(Books books) { System.out.println(books); bookService.addBook(books); return "redirect:/book/allBook"; } @RequestMapping("/toUpdateBook") public String toUpdateBook(Model model, int id) { Books books = bookService.queryBookById(id); System.out.println(books); model.addAttribute("book",books ); return "updateBook"; } @RequestMapping("/updateBook") public String updateBook(Model model, Books book) { System.out.println(book); bookService.updateBook(book); Books books = bookService.queryBookById(book.getBookID()); model.addAttribute("books", books); return "redirect:/book/allBook"; } @RequestMapping("/del/{bookId}") public String deleteBook(@PathVariable("bookId") int id) { bookService.deleteBookById(id); return "redirect:/book/allBook"; } }
六、总结
- mybatis-config.xml 完成dao层的mapper和mapper.xml的映射(扫描这个包并配置mapper)
- spring-dao.xml 帮助mybatis整合到spring中,主要完成获取数据库连接以及获取sqlSession对象并完成dao层mapper的自动注入。
- spring-mvc.xml 完成controller层的配置,扫描controller层的bean扫描,完成视图解析。
- spring-service.xml 把service层的方法注入到IOC容器中,完成配置事务管理。
- web.xml 完成DispatcherServlet的配置以及字符编码过滤(UTF-8)。
- applicationContext.xml 完成所有配置文件的整合引入。
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