SSM框架整合与配置

SSM

• JavaEE三层结构：

  • Web表现层 / controller控制层 (页面展示）

    1.Web层（SpringMVC）包括：

    ​ ①使用Servlet程序接收客户端的请求参数，封装成为Bean对象；

    ​ ②调用Service层处理业务；

    ​ ③响应数据给客户端，请求转发，请求重定向。

    controller层的功能为请求和响应控制。

    controller层负责前后端交互，接受前端请求，调用service层，接收service层返回的数据，最后返回具体的页面和数据到客户端。

  • Service 业务层（逻辑处理 Spring）

    ​ ①处理业务；

    ​ ②调用DAO持久层将数据保存到数据库。

  • Dao 持久层（数据持久化 – JDBC / Mybatis）

    也被称为mapper层。dao层的作用为访问数据库，向数据库发送sql语句，完成数据的增删改查任务。

  • model层（数据库实体层）

    ​ model层即数据库实体层，也被称为entity层，pojo层。

    ​ 一般数据库一张表对应一个实体类，类属性同表字段一一对应。

---

Maven

• 1、依赖

<!--依赖：junit, 数据库驱动 ，连接池 ， servlet , jsp , mybatis , mybattis-spring , spring,-->
   <dependencies>
       <!-- JUnit -->
       <dependency>
           <groupId>junit</groupId>
           <artifactId>junit</artifactId>
           <version>4.12</version>
       </dependency>

       <!-- MySQL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：c3p0 -->
       <dependency>
           <groupId>com.mchange</groupId>
           <artifactId>c3p0</artifactId>
           <version>0.9.5.5</version>
       </dependency>

       <!-- Servlet JSP -->
       <dependency>
           <groupId>javax.servlet</groupId>
           <artifactId>servlet-api</artifactId>
           <version>2.5</version>
       </dependency>
       <dependency>
           <groupId>javax.servlet</groupId>
           <artifactId>javax.servlet-api</artifactId>
           <version>4.0.1</version>
           <scope>provided</scope>
       </dependency>

       <dependency>
           <groupId>javax.servlet.jsp</groupId>
           <artifactId>jsp-api</artifactId>
           <version>2.2.1-b03</version>
           <scope>test</scope>
       </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>5.2.22.RELEASE</version>
       </dependency>
       <dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-jdbc</artifactId>
           <version>5.1.9.RELEASE</version>
       </dependency>
       <dependency>
           <groupId>org.aspectj</groupId>
           <artifactId>aspectjweaver</artifactId>
           <version>1.9.9</version>
       </dependency>

       <!-- lombok -->
       <dependency>
           <groupId>org.projectlombok</groupId>
           <artifactId>lombok</artifactId>
           <version>RELEASE</version>
           <scope>compile</scope>
       </dependency>

       <!-- JSON -->
       <dependency>
           <groupId>com.fasterxml.jackson.core</groupId>
           <artifactId>jackson-databind</artifactId>
           <version>2.15.0</version>
       </dependency>


   <!--静态资源导出问题-->
   <build>
       <resources>
           <resource>
               <directory>src/main/resources</directory>
               <includes>
                   <include>**/*.properties</include>
                   <include>**/*.xml</include>
               </includes>
               <filtering>true</filtering>
           </resource>
           <resource>
               <directory>src/main/java</directory>
               <includes>
                   <include>**/*.properties</include>
                   <include>**/*.xml</include>
               </includes>
               <filtering>true</filtering>
           </resource>
       </resources>
   </build>

• 2、在当前工件中的输出布局 – WEB-INF 中添加 lib 文件夹 导入当前项目库

SSM整合例子

---

Mybatis层

1、类

• pojo

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;
}

• Mapper

public interface BookMapper {
    int addBook(Books books);
    int deleteBook(@Param("bookId") int id);
    int updateBook(Books books);
    Books queryBookById(@Param("bookId") int id);
    List<Books> queryAllBook();
    Books queryBookByname(@Param("bookName") String bookName);
}

• Mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.chen.mapper.BookMapper">
    <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books (bookName, bookCounts, detail) values (#{bookName},#{bookCounts},#{detail})
    </insert>
    <delete id="deleteBook" parameterType="int">
        delete from ssmbuild.books where bookID=#{bookId}
    </delete>
    <update id="updateBook" parameterType="Books">
        update ssmbuild.books set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
        where bookID=#{bookID}
    </update>
    <select id="queryBookById" parameterType="int" resultType="Books">
        select * from ssmbuild.books
        where bookID=#{bookId}
    </select>
    <select id="queryAllBook" resultType="Books">
        select * from ssmbuild.books
    </select>
    <select id="queryBookByname" resultType="Books">
        select * from ssmbuild.books where bookName =#{bookName}
    </select>
</mapper>

• service
  • 接口上本质和mapper层接口无大差别（不需要映射属性）

public interface BookService {
    int addBook(Books books);
    int deleteBook(@Param("bookId") int id);
    int updateBook(Books books);
    Books queryBookById(@Param("bookId") int id);
    List<Books> queryAllBook();
    Books queryBookByname(@Param("bookName") String bookName);
}

• serviceImpl
  • 调用mapper层（使用spring方法，spring即可托管）

public class BookServiceImpl implements BookService{

    //service 调用mapper层，组合Mapper层
    //@Autowired 注解注入
    private BookMapper bookMapper;
    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }

    public int addBook(Books books) {
        return bookMapper.addBook(books);
    }
    public int deleteBook(int id) {
        return bookMapper.deleteBook(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();
    }
    public Books queryBookByname(String bookName) {
        return bookMapper.queryBookByname(bookName);
    }
}

2、mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><!--核心配置文件-->

    <settings>
        <!--标准的日志工厂实现-->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
        <!--是否开启白动驼峰命名规则(camel case)映射-->
        <!--<setting name="mapUnderscoreToCamelCase" value="true"/>-->
    </settings>

    <!--配置数据源，交给Spring去做-->

    <!--起别名-->
    <typeAliases>
        <package name="com.chen.pojo"/>
    </typeAliases>

    <mappers>
        <mapper class="com.chen.mapper.BookMapper"/>
    </mappers>

</configuration>

---

Spring层

3、Spring-mapper.xml

• db.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=false&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <!--1.关联数据库配置文件-->
    <context:property-placeholder location="classpath:db.properties"/>

    <!--2.连接池
    dbcp:半自动化操作，不能自动连接  (Spring自带)
    c3p0:自动化操作（自动化的加载配置文件，并且可以自动设置到对象中！） (需要导包)
    -->
    <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}"/>
    </bean>

    <!--3.sglSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--绑定Mybatis的配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!--配置dao接口扫描包，动态的实现了Dao接口可以注入到Spring容器中-->
    <!--曾经（mapper需要创建mapper实现类 使用SqlSessionTemplate / 继承SqlSessionDaoSupport  来获取getSqlSession） 现在全自动-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--要扫描的mapper包-->
        <property name="basePackage" value="com.chen.mapper"/>
    </bean>

</beans>

• 配置dao接口扫描包 已经将mapper层的接口全部注入到了Spring容器中去了，默认名字为接口名的小写，后面注解注入即可

4、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
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--1.扫描service的包-->
    <context:component-scan base-package="com.chen.service"/>

    <!--2.将我们的所有业务类，注入到Spring,可以通过配置，或者注解实现-->
    <bean id="BookServiceImpl" class="com.chen.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/><!--可通过注解注入-->
    </bean>

    <!--3.声明式事务配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--4.aop事务支持-->
    <!--结合AOP实现事务的织入-->
    <!--配置事务通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <!--给那些方法配置事务-->
        <!--
            配置事务的传播特性propagation：new   默认：REQUIRED。REQUIRED：
            支持当前事务，如果当前没有事务，就新建一个事务。这是最常见的选择(增删改)
        -->
        <tx:attributes>
            <!--name匹配方法名开头-->
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>


    <!--配置事务的切入-->
    <aop:config>
        <!--切入点-->
        <aop:pointcut id="txPointCut" expression="execution(* com.chen.mapper.*.*(..))"/><!--该文件所有类和方法都被织入-->
        <!--切入事务-->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    </aop:config>


</beans>

---

SpringMvc层

5、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">

    <!-- 1.配置DispatchServlet:这个是SpringMVC的核心：请求分发器，前端控制器 -->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- DispatchServlet 要绑定Spring的配置文件-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <!--配置文件springmvc-servlet-->
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--2.配置SpringMVC乱码过滤-->
    <filter>
        <filter-name>encoding</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>encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--Session-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>

</web-app>

6、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: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
        https://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--1.注解驱动-->
    <mvc:annotation-driven/>
    <!--2.自动扫描包，让指定包下的注解生效，由I0C容器统一管理-->
    <context:component-scan base-package="com.chen.controller"/>
    <!--3.资源过滤Spring MVC不处理静态资源  .css  .js  .html  .png-->
    <mvc:default-servlet-handler />
    <!--4.视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          id="internalResourceviewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

---

Controller

• 相当于 servlet

@Controller
@RequestMapping("/book")
public class BookController {

    //controller 调用 service 层
    @Autowired
    @Qualifier("BookServiceImpl")//包
    private BookService bookService;

    //查询全部书籍信息，返回书籍展示页面
    @RequestMapping("/allBook")
    public String list(Model model){
        List<Books> bookList = bookService.queryAllBook();
        model.addAttribute("list",bookList);
        return "allBook";
    }

    //跳转到增加书籍页面
    @RequestMapping("/toAddBook")
    public String toAddPaper(){
        return "addBook";
    }

    //添加书籍的请求
    @RequestMapping("/addBook")
    public String addBook(Books books){
        bookService.addBook(books);
        return  "redirect:/book/allBook";//重定向我们的@RequestMapping("/allBook")请求
    }

    //跳转到修改书籍界面
    @RequestMapping("/toUpdateBook")
    public String toUpdateBook(int id,Model model) {
       Books books=bookService.queryBookById(id);
        model.addAttribute("QBooks",books);
        return "updateBook";
    }

    //修改书籍
    @RequestMapping("/updateBook")
    public String updateBook(Books books){
        bookService.updateBook(books);
        return "redirect:/book/allBook";
    }

    //删除书籍
    @RequestMapping("/deleteBook/{bookId}")
    public String deleteBook(@PathVariable("bookId") int id){
        bookService.deleteBook(id);
        return "redirect:/book/allBook";
    }

    //查询书籍
    @RequestMapping("/queryBook")
    public String queryBook(String queryBookName,Model model){
        Books books = bookService.queryBookByname(queryBookName);
        List<Books> list=new ArrayList<>();
        if(books==null){
            list=bookService.queryAllBook();
            model.addAttribute("error","未查到");
        }
        list.add(books);
        model.addAttribute("list",list);
        return "allBook";
    }

    @RequestMapping("/a1")
    @ResponseBody
    public void a1(String name, HttpServletResponse response) throws IOException {
        System.out.println("a1:param=>"+name);
        if (name.equals("chen")){
            response.getWriter().print("true");
        }
        else {
            response.getWriter().print("false");
        }
    }
}