SSM整合

依赖

<dependencies>
    <!--测试工具-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    <!--mysql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-->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
    </dependency>
    <!--jsp-->
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.2</version>
    </dependency>
    <!--jstl标签库-->
    <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>
    <!--解析切入点表达式-->
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.8.13</version>
    </dependency>
    <!--JSON解析器-->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.10.0</version>
    </dependency>
</dependencies>
<!--静态资源导出-->
<build>
    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.xml</include>
                <include>**/*.properties</include>
            </includes>
            <filtering>false</filtering>
        </resource>
        <resource>
            <directory>src/main/resources</directory>
            <includes>
                <include>**/*.xml</include>
                <include>**/*.properties</include>
            </includes>
            <filtering>false</filtering>
        </resource>
    </resources>
</build>

web.xml

<?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_4_0.xsd"
         version="4.0">
    <!--DispatcherServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <!--与Tomcat同时启动-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!--乱码过滤-->
    <filter>
        <filter-name>encodingFilter</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>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!--Session-->
    <session-config>
        <!--Session过期时间，分钟-->
        <session-timeout>3</session-timeout>
    </session-config>
</web-app>

db.properties

#使用c3p0连接池，配置格式一定要规范
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?useSSL&useUnicode=true&charsetEncoding=UTF-8
jdbc.username=root
jdbc.password=123

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="classpath:spring-mapper.xml"/>
    <import resource="classpath:spring-service.xml"/>
    <import resource="classpath:spring-mvc.xml"/>
</beans>

spring-mapper.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"
       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">
    <!--引入数据库配置文件-->
    <context:property-placeholder location="classpath:db.properties"/>
    <!--配置连接池：c3p0-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <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私有属性-->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!--关闭连接后不自动连接-->
        <property name="autoCommitOnClose" value="false"/>
        <!--连接超时时长-->
        <property name="checkoutTimeout" value="5000"/>
        <!--连接失败重试次数-->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>
    <!--配置sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--绑定数据源-->
        <property name="dataSource" ref="dataSource"/>
        <!--绑定mybatis的配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
    <!--配置mapper接口扫描，把mapper接口交给Spring管理-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--要扫描的包-->
        <property name="basePackage" value="org.example.mapper"/>
    </bean>
</beans>

spring-service.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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
       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
       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">
    <!--扫描service包-->
    <context:component-scan base-package="org.example.service"/>
    <!--注入业务类到Spring-->
    <bean id="bookServiceImpl" class="org.example.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>
    <!--配置声明式事务-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--aop事务支持-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>
    <!--配置事务切入-->
    <aop:config>
        <aop:pointcut id="txPointCut" expression="execution(* org.example.mapper.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    </aop:config>
</beans>

spring-mvc.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:mvc="http://www.springframework.org/schema/mvc"
       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/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <!--扫描包-->
    <context:component-scan base-package="org.example.controller"/>
    <!--静态资源过滤-->
    <mvc:default-servlet-handler/>
    <!--注解驱动-->
    <mvc:annotation-driven>
        <mvc:message-converters register-defaults="true"><!--JSON乱码处理-->
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <constructor-arg value="UTF-8"/>
            </bean>
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <property name="objectMapper">
                    <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
                        <property name="failOnEmptyBeans" value="false"/>
                    </bean>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>
    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--配置拦截器-->
    <mvc:interceptors>
        <mvc:interceptor>
            <!--拦截'/admin'下的所有请求-->
            <mvc:mapping path="/admin/**"/>
            <!--拦截的请求会进入这个类-->
            <bean class="org.example.config.MyInterceptor"/>
        </mvc:interceptor>
    </mvc:interceptors>
</beans>

mybatis-config.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>
    <settings>
        <!--映射实体类驼峰命名-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <!--配置日志实现-->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
    <!--别名配置-->
    <typeAliases>
        <package name="org.example.pojo"/>
    </typeAliases>
    <!--mapper注册-->
    <mappers>
        <mapper class="org.example.mapper.BookMapper"/>
    </mappers>
</configuration>

实体类

public class Book {
    private Integer bookId;
    private String bookName;
    private Integer bookCount;
    private String detail;
}

mapper

public interface BookMapper {
    @Select("select * from book")
    List<Book> getBooks();
    Book getBookById(int book_id);
    int addBook(Book book);
    int deleteBookByIds(int[] book_ids);
    int updateBook(Book book);
}

mapper.xml

<?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="org.example.mapper.BookMapper">
    <select id="getBookById" resultType="Book">
        select * from book where book_id = #{book_id}
    </select>
    <insert id="addBook" parameterType="Book">
        insert into book (book_name,book_count,detail) values (#{bookName},#{bookCount},#{detail})
    </insert>
    <delete id="deleteBookByIds">
        delete from book where book_id in
        <foreach collection="array" item="id" separator="," open="(" close=")">
            #{id}
        </foreach>
    </delete>
    <update id="updateBook" parameterType="Book">
        update book set
        book_name = #{bookName},
        book_count = #{bookCount},
        detail = #{detail}
        where book_id = #{book_id}
    </update>
</mapper>

service

public interface BookService {
    List<Book> getBooks();
    Book getBookById(int book_id);
    int addBook(Book book);
    int deleteBookByIds(int[] book_ids);
    int updateBook(Book book);
}

service实现

public class BookServiceImpl implements BookService{
    private BookMapper bookMapper;
    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }
    @Override
    public List<Book> getBooks() {
        return bookMapper.getBooks();
    }
    @Override
    public Book getBookById(int book_id) {
        return bookMapper.getBookById(book_id);
    }
    @Override
    public int addBook(Book book) {
        return bookMapper.addBook(book);
    }
    @Override
    public int deleteBookByIds(int[] book_ids) {
        return bookMapper.deleteBookByIds(book_ids);
    }
    @Override
    public int updateBook(Book book) {
        return bookMapper.updateBook(book);
    }
}

controller

@Controller
@RequestMapping("/book")
public class BookController {
    @Autowired
    @Qualifier("bookServiceImpl")
    private BookService bookService;
    @RequestMapping("/getBooks")
    // @ResponseBody
    public String getBooks(Model model){
        List<Book> bookList = bookService.getBooks();
        model.addAttribute("bookList",bookList);
        return "library";
    }
}

拦截器

public class MyInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 放行，执行下一个拦截器
        return true;
        // 不执行下一个拦截器
        // return false;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    }
}

测试类

public class MyTest {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        BookService bookService = (BookService) context.getBean("bookServiceImpl");
        for (Book book : bookService.getBooks()) {
            System.out.println(book);
        }
    }
}