Spring整合MyBatis 基础

1：MyBatis简介

MyBatis 是一款优秀的持久层框架，它支持定制化 SQL、存储过程以及高级映射。MyBatis 避免了几乎所有的 JDBC 代码和手动设置参数以及获取结果集。MyBatis 可以使用简单的 XML 或注解来配置和映射原生信息，将接口和 Java 的 POJOs(Plain Old Java Objects,普通的 Java对象)映射成数据库中的记录。

2：Spring简介

Spring 是一个开源框架，是为了解决企业应用程序开发复杂性而创建的。框架的主要优势之一就是其分层架构，分层架构允许您选择使用哪一个组件，同时为 J2EE 应用程序开发提供集成的框架，核心容器提供 Spring 框架的基本功能。核心容器的主要组件是 BeanFactory，它是工厂模式的实现。BeanFactory 使用控制反转 （IOC）模式将应用程序的配置和依赖性规范与实际的应用程序代码分开。

3：主题如何整合？

1， pom文件所需求的依赖

<dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-beans</artifactId>
           <version>4.2.0.RELEASE</version>
       </dependency>

       <dependency>
           <groupId>mysql</groupId>
           <artifactId>mysql-connector-java</artifactId>
           <version>5.1.39</version>
       </dependency>


       <dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-context</artifactId>
           <version>4.2.0.RELEASE</version>
       </dependency>



       <dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-jdbc</artifactId>
           <version>4.3.11.RELEASE</version>
       </dependency>

       <dependency>
           <groupId>org.mybatis</groupId>
           <artifactId>mybatis</artifactId>
           <version>3.2.2</version>
       </dependency>

       <!--Mybatis+Spring -->
       <dependency>
           <groupId>org.mybatis</groupId>
           <artifactId>mybatis-spring</artifactId>
           <version>1.2.1</version>
       </dependency>
       <dependency>
           <groupId>junit</groupId>
           <artifactId>junit</artifactId>
           <version>4.12</version>
       </dependency>



       <dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-web</artifactId>
           <version>4.0.6.RELEASE</version>
       </dependency>

       <!--jstl的包-->
       <dependency>
           <groupId>javax.servlet</groupId>
           <artifactId>jstl</artifactId>
           <version>1.2</version>
           <scope>runtime</scope>
       </dependency>

       <dependency>
           <groupId>junit</groupId>
           <artifactId>junit</artifactId>
           <version>4.3</version>
       </dependency>

       <!--日志的jar-->
       <dependency>
           <groupId>log4j</groupId>
           <artifactId>log4j</artifactId>
           <version>1.2.17</version>
       </dependency>





                                       2，结构图

                                   3，上代码

       一 : entity( 实体层 )

public class Book {
    private Integer id;
    private String name;
    private Integer price;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getPrice() {
        return price;
    }

    public void setPrice(Integer price) {
        this.price = price;
    }
}

二：Dao（接口层）

public interface IBookDao {
    public int addBook(Book book);
}

　　小配置

<?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="cn.happy.dao.IBookDao">
<!--简单的添加-->
    <insert id="addBook">
        insert INTO book(name,price) VALUES (#{name},#{price})
    </insert>
</mapper>

　　三： service（中转层）

//接口
public interface BookService {
    public int addBook(Book book);
}

　//service 的实现

public class BookServiceImpl implements  BookService{
    public IBookDao getBookDao() {
        return bookDao;
    }

    public void setBookDao(IBookDao bookDao) {
        this.bookDao = bookDao;
    }

    private IBookDao bookDao;
    public int addBook(Book book) {
        return bookDao.addBook(book);
    }
}

　　四：servlet（实现 jsp）

public class IBookServlet extends javax.servlet.http.HttpServlet {
    protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
               request.setCharacterEncoding("utf-8");

               String action=request.getParameter("action");
               if(action.equals("Add")) {
                   String bname = request.getParameter("bname");
                   int money = Integer.parseInt(request.getParameter("money"));

                   Book book = new Book();
                   book.setName(bname);
                   book.setPrice(money);

                   /*ApplicationContext context = new ClassPathXmlApplicationContext("applicationContextSMM.xml");*/

                   WebApplicationContext context= WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());


                   BookService service = (BookService) context.getBean("service");
                   int count = service.addBook(book);

                   if (count > 0) {
                       request.getRequestDispatcher("/reg.jsp").forward(request, response);
                   }

               }
    }

    protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
        doPost(request,response);
    }
}

　　 // 大配置 applicationContextSMM.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:p="http://www.springframework.org/schema/p"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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
       http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx.xsd
">

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    <!-- 第二步：识别jdbc。properties-->
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties"></property>
    </bean>
    <!--第三步:把数据源装配给SqlSessionFactoryBean-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!--第四步:用MapperScannerConfigurer生                                                                                                               成dao层的实现层-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="cn.happy.dao"></property>
    </bean>
    <!-- 装配service-->
    <bean id="service" class="cn.happy.service.BookServiceImpl">
        <property name="bookDao" ref="IBookDao"></property>
    </bean>
</beans>

　　 //建立数据源jdbc.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///***
jdbc.username=****
jdbc.password=****

　　web

  <!-- 上下文-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <!--编码过滤器-->
  <filter>
    <filter-name>CharactorEncoding</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>

    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>

  <filter-mapping>
    <filter-name>CharactorEncoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>


  <!-- 监听器-->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>


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


  <!--方式一：加载图片-->
  <!--css,js,jpg-->
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.js</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.css</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.jpg</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.bmp</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.gif</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.png</url-pattern>
  </servlet-mapping>

  <welcome-file-list>

    <welcome-file>login.jsp</welcome-file>

  </welcome-file-list>

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原文地址：https://www.cnblogs.com/1612ss/p/7737198.html

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