搭建Spring实例
持久层
import org.springframework.stereotype.Repository; @Repository //将该类的对象创建为userDao实例 public class UserDao{ public String findUserByName(String userName) { return "abc"; } }
业务层
import com.baobaotao.dao.UserDao; import com.sun.istack.internal.FinalArrayList; @Service //通常作用在业务层,主要将业务层的类自动注册到spring容器 public class UserService{ @Autowired //自动将bean注册到该对象 private UserDao userDao; private TransactionTemplate transactionTemplate; public String login(final String name,final String password) { return transactionTemplate.execute(new TransactionCallback(){ public Object doInTransaction(TransactionStatus status) { Object result; try { result = userDao.findUserByName(name); } catch (Exception e) { status.setRollbackOnly(); result = false; System.out.println("Transfer Error!"); } return result; } }); } }
控制层
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import javax.servlet.http.HttpServletRequest; import com.baobaotao.domain.User; import com.baobaotao.service.UserService; @Controller //将该类注册为一个控制层的Bean实例 public class UserController{ @Autowired //自动注入spring容器的bean实例 private UserService userService; @RequestMapping(value="login") // public String login(HttpServletRequest request,User user){ System.out.println("=========aaaaaaaa===="); String result = userService.login(user.getUserName(), user.getPassword()); return "success"; }
Spring容器配置文件
<?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:context="http://www.springframework.org/schema/context" xmlns:c="http://www.springframework.org/schema/c" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation=" http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd"> <!-- 扫描类包,将通过注解的类转换为Bean实例 --> <context:component-scan base-package="com.baobaotao.dao"></context:component-scan> <context:component-scan base-package="com.baobaotao.service"></context:component-scan> <context:component-scan base-package="com.baobaotao.controller"></context:component-scan> <context:component-scan base-package="testpackage"></context:component-scan> </beans>
SpringMVC配置文件
<?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 http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <mvc:annotation-driven/> <context:component-scan base-package="com.baobaotao.controller"/> <!-- 配置视图解析器,将ModelAndView及字符串解析为具体页面 --> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> <property name="prefix" value="/WEB-INF/views/"/> <property name="suffix" value=".jsp"/> </bean> </beans>
web.xml文件配置
<?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"> <display-name>baobaotao</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <!-- 从类路径下面加载Spring配置文件 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <!-- 加载配置文件的监听器 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- SpringMVC的配置文件加载,这里定义了一个servlet,servlet名自己取后面要用到,class固定的,不可改变。 然后就是初始化init后要加载的xml文件,默认名为servlet名-servlet.xml,这个是要加载到webroot-webinf-classes下的 --> <servlet> <servlet-name>baobaotao</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:baobaotao-servlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>baobaotao</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
注解详解
@Repository,标识Dao层的Bean实例。可以设置为@Repository(“XXX”)。
@Service(“XXX”),就相当于将业务层的类定义为一个 bean,其中,XXX 即为 bean 的名称。如果不设置bean的名字,会默认为类名作为实例名。
@Controller,用于标注控制层组件。可以设置为@Controller("XXX")。
@Component,泛指任何一层的bean实例,可以设置为@Component("XXX)。
原文地址:https://www.cnblogs.com/youzhongmin/p/8496832.html
时间: 2024-10-10 13:45:29