编写Dao以及实现
接口
package zhongfucheng.dao; import zhongfucheng.entity.Dept; /** * Created by ozc on 2017/8/8. */ public interface DeptDao { Dept selectDept(Integer deptId); int insertDept(Dept dept); }
实现:
package zhongfucheng.dao.impl; import org.mybatis.spring.SqlSessionTemplate; import org.springframework.stereotype.Repository; import zhongfucheng.entity.Dept; import javax.annotation.Resource; /** * Created by ozc on 2017/8/8. */ @Repository("deptDao") public class DeptDaoImpl implements zhongfucheng.dao.DeptDao { @Resource private SqlSessionTemplate sqlSessionTemplate; /** * 根据部门编号查询部门信息 * @param deptId 部门编号 * @return 部门信息 */ @Override public Dept selectDept(Integer deptId){ Dept dept= sqlSessionTemplate.selectOne("zhongfucheng.entity.DeptMapper.selectDept", deptId); return dept; } /** * 添加部门信息 * @param dept 部门信息 * @return 添加成功的记录数 */ @Override public int insertDept(Dept dept){ System.out.println("------dao.dept:"+dept); return sqlSessionTemplate.insert("zhongfucheng.entity.DeptMapper.insertDept", dept); } }
测试spring与mybatis整合
import org.junit.AfterClass; import org.junit.BeforeClass; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import zhongfucheng.dao.impl.DeptDaoImpl; import zhongfucheng.entity.Dept; /** * Created by ozc on 2017/8/8. */ public class TestDeptDao { //@Resource //这里没法使用,后继版本有其它方式可以注入 static private DeptDaoImpl deptDao; @BeforeClass public static void setUpBeforeClass() throws Exception { ApplicationContext context =new ClassPathXmlApplicationContext("applicationContext.xml"); deptDao=(DeptDaoImpl) context.getBean("deptDao"); } @AfterClass public static void tearDownAfterClass() throws Exception { } @Test public void testSelectDept() { System.out.println(deptDao.selectDept(1)); } @Test public void testInsertDept() { Dept dept=new Dept(); //dept.setDeptId(117); dept.setDeptName("name117"); dept.setDeptAddress("address117"); System.out.println("受影响行数:"+deptDao.insertDept(dept)); } }
整合SpringMVC
配置文件
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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd "> <!-- 同时开启json格式的支持 --> <mvc:annotation-driven></mvc:annotation-driven> <!-- <context:component-scan base-package="*"/> --> <!-- 扫描所有的controller 但是不扫描service --> <context:component-scan base-package="zhongfucheng"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" /> <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" /> </context:component-scan> </beans>
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_3_1.xsd" version="3.1"> <!--Spring监听器--> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <!--Mvc分配器--> <servlet> <servlet-name>mvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>mvc</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping> <!--中文过滤器--> <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> </web-app>
编写Action
package zhongfucheng.action; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import zhongfucheng.dao.impl.DeptDaoImpl; import zhongfucheng.entity.Dept; import javax.annotation.Resource; /** * Created by ozc on 2017/8/8. */ @Controller @RequestMapping(value="/dept") public class DeptAction { @Resource private DeptDaoImpl deptDao; @RequestMapping(value="/insert") public String insert(Dept dept){ System.out.println("---action.dept:"+dept); deptDao.insertDept(dept); return "forward:/jsp/main.jsp"; } }
测试SSI整合
index.jsp页面
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> </head> <body> <form action="dept/insert.action" method="post"> 名称:<input type="text" name="deptName"><br> 地址:<input type="text" name="deptAddress"><br> <input type="submit" value="ok"> </form> </body> </html>
main.jsp页面:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> </head> <body> this is main jsp </body> </html>
优化
如果想要Spring与Mybatis更加完美地结合,其实我们的Dao并不需要写实现,直接写接口和映射文件就行了,这样一来,我们就可以舍弃DaoImpl了。
在Spring配置文件中加入以下的代码:
<!-- 配置 转换器,对于在basePackage设置的包(包括子包)下的接口类, 如果接口类的全类名在Mapper.xml文件中和定义过命名空间一致, 将被转换成spring的BEAN,在调用的地方通过@Autowired方式将可以注入接口实例 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionFactory" ref="sqlSessionFactory" /> <!--这里包名留意要不要改--> <property name="basePackage" value="zhongfucheng.dao" /> </bean>
我们的映射文件中把命名空间写成是Dao的全路径
//Dao的全路径,那么Spring就会自动帮我们创建对象,注入进去 <mapper namespace="zhongfucheng.dao.DeptDao"> <resultMap type="Dept" id="deptResultMap"> <id property="deptId" column="dept_id" /> <result property="deptName" column="dept_name" /> <result property="deptAddress" column="dept_address" /> </resultMap> <!-- id和命名空间用来定位SQL语句,parameterType表示参数的类型,resultMap返回类型 --> <select id="selectDept" parameterType="Integer" resultMap="deptResultMap"> <!--参数的写法#{deptID} --> select * from dept where dept_id=#{deptID} </select> <insert id="insertDept" parameterType="Dept"> insert into dept(dept_name,dept_address) values(#{deptName},#{deptAddress}); </insert> </mapper>
在配置工厂的时候,我们可以配置mapperLocations属性,这样一来,我们就不用在Mybatis中逐个加载配置文件了。
<!-- 配置session工厂 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!--这里的路径和名字留意要不要改--> <property name="configLocation" value="classpath:myBatis-config.xml" /> <!--配置扫描式加载SQL映射文件,记得去掉mybatis-config配置,使用了这个,在Mybatis配置文件中就不用加载对应的映射文件了--> <!--这里留意路径是否要改--> <property name="mapperLocations" value="classpath:zhongfucheng/dao/*.xml"/> </bean>
总结
SSM整合和SSH整合的步骤差不多
- log4j配置文件
- web.xml配置文件
- SpringContext监听器
- SpringMVC核心过滤器
- 中文过滤器
- Spring配置文件
- 数据库连接池
- Mybatis总配置文件
- SessionFactory
- 事务
- 扫描注解,不扫描controller
- sessionTemplate(简化SQLSession的操作)
- 转换器[使用Mapper来进行代理]
- Mybatis映射文件
- SpringMVC配置文件
- 扫描controller,不扫描service