mybatis学习笔记(六) -- maven+spring+mybatis从零开始搭建整合详细过程(下)
继续 mybatis学习笔记(五) -- maven+spring+mybatis从零开始搭建整合详细过程(上)
五、使用监听器启动Spring容器
1、修改pom.xml文件,添加Spring-web
2、修改web.xml,配置启动Spring容器
3、新建BookServer
4、新建BookServlet
5、修改ApplicationContext.xml
6、测试
继续!!!
五、使用监听器启动Spring容器
1、修改pom.xml,添加Spring-web包(注:上一篇中的pom.xml已经添加)
<!--添加spring-web包 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>4.1.4.RELEASE</version> </dependency>
2、修改web.xml文件(src/main/webapp/WEB-INF/web.xml),如果该目录下没有这个文件,则新建一个
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <listener> <description>Spring容器启动监听器</description> <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> </web-app>
3、新建一个BookService
package com.lmei.service; import java.util.List; import javax.annotation.Resource; import org.springframework.stereotype.Service; import com.lmei.dao.BookDaoI; import com.lmei.entity.Book; @Service public class BookService { @Resource BookDaoI bookDao; public List<Book> getAllBook() { return bookDao.getAllBook(); } }
@Service切记勿漏写,如果没写,运行时会报错“org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.lmei.service.BookService] is defined”
4、新建BookServlet
package com.lmei.action; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.context.WebApplicationContext; import org.springframework.web.context.support.WebApplicationContextUtils; import com.lmei.service.BookService; @WebServlet("/BookServlet.do") public class BookServlet extends HttpServlet { private static final long serialVersionUID = 1L; BookService bookService; @Override public void init() throws ServletException { //在当前上下文中获得Spring容器 WebApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(getServletContext()); //从容器中获得bean bookService = ctx.getBean(BookService.class); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter writer = response.getWriter(); writer.print(bookService.getAllBook().size()); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
serialVersionUID作用:序列化时为了保持版本的兼容性,即在版本升级时反序列化仍保持对象的唯一性。
两种生成方式:
一个是默认的1L,比如:private static final long serialVersionUID = 1L;
一个是根据类名、接口名、成员方法及属性等来生成一个64位的哈希字段,比如:private static final long serialVersionUID = xxxxL;
5、修改ApplicationContext.xml,新增配置
<!--自动扫描映射接口--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 指定sql会话工厂,在上面配置过的 --> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property> <!-- 指定基础包,即自动扫描com.lmei.dao这个包下的所有接口类 --> <property name="basePackage" value="com.lmei.dao"></property> </bean> <!--自动扫描组件 --> <context:component-scan base-package="com.lmei"> <context:exclude-filter type="aspectj" expression="com.lmei.dao.*"/> </context:component-scan> <aop:aspectj-autoproxy proxy-target-class="true"></aop:aspectj-autoproxy>
完整的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" xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop" 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-4.3.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd"> <!-- 引入db.properties属性文件 --> <context:property-placeholder location="classpath:db.properties" /> <!--定义一个jdbc数据源,创建一个驱动管理数据源的bean --> <bean id="jdbcDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="${jdbc.driver}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> </bean> <!--创建一个sql会话工厂bean,指定数据源 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 指定数据源 --> <property name="dataSource" ref="jdbcDataSource" /> <!--类型别名包,默认引入com.lmei.entity下的所有类 --> <property name="typeAliasesPackage" value="com.lmei.entity"></property> <!--指定sql映射xml文件的路径 --> <property name="mapperLocations" value="classpath:com/lmei/mapper/*Mapper.xml"></property> </bean> <!--自动扫描映射接口--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 指定sql会话工厂,在上面配置过的 --> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property> <!-- 指定基础包,即自动扫描com.lmei.dao这个包下的所有接口类 --> <property name="basePackage" value="com.lmei.dao"></property> </bean> <!--自动扫描组件 --> <context:component-scan base-package="com.lmei"> <context:exclude-filter type="aspectj" expression="com.lmei.dao.*"/> </context:component-scan> <aop:aspectj-autoproxy proxy-target-class="true"></aop:aspectj-autoproxy> </beans>
6、测试
项目右键->Run AS->Run On Server->Tomcat Server at localhost(运行前确认是否已配置Apache Tomcat)
运行成功后,在浏览器输入:http://localhost:8888/spring_mybatis_1/BookServlet.do
返回 4,表示有4条符合条件的结果。
本篇到此结束!!!
如有兴趣了解Springmvc+spring+mybatis可前往:
springmvc学习总结(二) -- maven+springmvc+spring+mybatis+mysql详细搭建整合过程讲解