SSM框架整合

^ _ ^

配置环境依赖

在pom.xml文件中配置编译环境

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
</properties>

在pom.xml文件中添加依赖包

<dependencies>
    <!--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>5.1.6</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>2.0</version>
    </dependency>
    <dependency>
        <groupId>jstl</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>2.0.6</version>
    </dependency>

    <!--Spring-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.3.2</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.1.9.RELEASE</version>
    </dependency>

    <!--lombok-->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.16</version>
    </dependency>
</dependencies>

在pom.xml文件中添加资源过滤配置

<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>
        </resource>
    </resources>
</build>

建立项目基本包结构

在 src/main/java 目录下建立

1. pojo包 – 实体类
2. dao包 – 数据库接口
3. service包 – 服务接口
4. impl包 – 位于service包下，保存服务接口的实现类
5. controller包 – 接收前端数据并返回处理结果的类

建立数据库

create database book_shop;
use book_shop;

create table books(
    id int(10) not null auto_increment,
    name varchar(100) not null,
    count int(11) not null,
    detail text not null,
    primary key (id)
)ENGINE=INNODB DEFAULT CHARSET=utf8;

insert into books(name,count,detail) values('Java',1,'从入门到放弃'),
        ('MySQL',10,'从删库到跑路'),('Linux',5,'从进门到进牢');

添加配置文件

1. 数据库配置文件 jdbc.properties

   driver = com.mysql.jdbc.Driver
   url = jdbc:mysql://localhost:3307/book_shop?useSSL=false&useUnicode=true&charsetEncoding=UTF-8&serverTimezone=UTC
   username = root
   password = MyNewPass

2. 添加mybatis配置文件 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>
           <!--开启自动驼峰命名规则映射-->
           <setting name="mapUnderscoreToCamelCase" value="true"/>
           <!--标准日志工厂-->
           <setting name="logImpl" value="STDOUT_LOGGING"/>
       </settings>
   
       <typeAliases>
           <package name="com.llunch4w.pojo"/>
       </typeAliases>
   
       <mappers>
           <package name="com.llunch4w.dao"/>
       </mappers>
   </configuration>

3. 添加 spring 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"
          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>

4. 配置 spring 整合 mybatis 文件 spring-dao.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">
       <!-- 配置整合mybatis -->
       <!-- 1.关联数据库文件 -->
       <context:property-placeholder location="classpath:jdbc.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="${driver}"/>
           <property name="jdbcUrl" value="${url}"/>
           <property name="user" value="${username}"/>
           <property name="password" value="${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 -->
       <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.llunch4w.dao"/>
       </bean>
   </beans>

5. 配置 spring 整合 service 层文件 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"
          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">
   
       <!-- 开启Spring注解驱动 -->
       <context:annotation-config/>
   
       <!--扫描指定包下的注解-->
       <context:component-scan base-package="com.llunch4w.service.impl" />
   
       <!-- 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>

6. 配置 spring 与 web 层整合文件 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
       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.llunch4w.controller" />
   </beans>

7. 将项目添加Web的框架支持，然后编写web/WEB-INF/下的 web.xml 文件

   <?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>DispatcherServlet</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>
           <load-on-startup>1</load-on-startup>
       </servlet>
       <servlet-mapping>
           <servlet-name>DispatcherServlet</servlet-name>
           <url-pattern>/</url-pattern>
       </servlet-mapping>
   
       <!--encodingFilter-->
       <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过期时间-->
       <session-config>
           <session-timeout>15</session-timeout>
       </session-config>
   
       <!--引导页-->
       <welcome-file-list>
           <welcome-file>index.jsp</welcome-file>
       </welcome-file-list>
   
       <!--自己配置描述文件-->
       <jsp-config>
           <taglib>
           <taglib-uri>http://java.sun.com/jsp/jstl/core</taglib-uri>
           <taglib-location>/WEB-INF/jstl_tld/c.tld</taglib-location>
           </taglib>
           <taglib>
           <taglib-uri>http://java.sun.com/jsp/jstl/fmt</taglib-uri>
           <taglib-location>/WEB-INF/jstl_tld/fmt.tld</taglib-location>
           </taglib>
           <taglib>
           <taglib-uri>http://java.sun.com/jsp/jstl/fn</taglib-uri>
           <taglib-location>/WEB-INF/jstl_tld/fn.tld</taglib-location>
           </taglib>
       </jsp-config>
   </web-app>

编写类

1. pojo包下的 Books 类

   @Data
   @AllArgsConstructor
   @NoArgsConstructor
   public class Books {
       private int id;
       private String name;
       private int count;
       private String detail;
   }

2. 编写dao包下的数据库接口和对应的xml文件
   BooksMapper.java

   @Repository
   public interface BooksMapper {
       int insert(Books book);
   
       int delete(int id);
   
       int update(Books book);
   
       List<Books> queryById(int id);
   
       List<Books> queryAll();
   }

BooksMapper.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="com.llunch4w.dao.BooksMapper">
    <!--增加-->
    <insert id="insert" parameterType="Books">
        insert into books(name,count,detail) values(#{name},#{count},#{detail})
    </insert>

    <!--删除-->
    <delete id="deleteById">
        delete from books where id=#{id}
    </delete>

    <!--更新-->
    <update id="updateById">
        update books set name=#{name},count=#{count},detail=#{detail} where id=#{id}
    </update>

    <!--通过ID查询-->
    <select id="queryById" resultType="Books">
        select * from books where id=#{id}
    </select>

    <!--查询所有-->
    <select id="queryAll" resultType="Books">
        select * from books
    </select>
</mapper>

3. 在service包下编写类
   BooksService.java

   public interface BooksService {
       boolean insert(Books book);
   
       boolean deleteById(int id);
   
       boolean updateById(Books book);
   
       List<Books> queryById(int id);
   
       List<Books> queryAll();
   }

impl包下BooksServiceImpl.java

@Service
public class BooksServiceImpl implements BooksService {
    @Autowired
    @Qualifier("booksMapper")
    private BooksMapper booksMapper;

    public boolean insert(Books book) {
        return booksMapper.insert(book) > 0 ;
    }

    public boolean deleteById(int id) {
        return booksMapper.deleteById(id) > 0;
    }

    public boolean updateById(Books book) {
        return booksMapper.updateById(book) > 0;
    }

    public List<Books> queryById(int id) {
        return booksMapper.queryById(id);
    }

    public List<Books> queryAll() {
        return booksMapper.queryAll();
    }
}

4. 在controller包下编写类
   BooksController.java

   @Controller("books")
   @RequestMapping("/book")
   public class BooksController {
       @Autowired
       @Qualifier("booksServiceImpl")
       private BooksService booksService;
   
       @RequestMapping("/getAllBooks")
       public String getAllBooks(Model model){
           List<Books> bookList = booksService.queryAll();
           model.addAttribute("bookList",bookList);
           return "allBooks";
       }
   }

5. 添加依赖，否则会出现404错误
   

测试

@Test
public void test1(){
    ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
    BooksService service = (BooksServiceImpl)context.getBean("booksServiceImpl");
    List<Books> booksList = service.queryAll();
    for (Books book : booksList) {
        System.out.println(book);
    }
}