<context:component-scan base-package=com.xxx.xxx/ >包扫描注解

本文深入解析Spring框架中的组件注解,包括@Controller、@Service、@Repository、@Component等,以及请求映射@RequestMapping、资源注入@Resource、依赖注入@Autowired等常用注解的功能和用法。同时介绍了事务管理@Transactional、响应体注解@ResponseBody、作用域注解@Scope等高级特性。

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<context:component-scan/> 扫描指定的包中的类上的注解,常用的注解有:

@Controller 声明Action组件
@Service    声明Service组件    @Service("myMovieLister") 
@Repository 声明Dao组件
@Component   泛指组件, 当不好归类时. 
@RequestMapping("/menu")  请求映射
@Resource  用于注入,( j2ee提供的 ) 默认按名称装配,@Resource(name="beanName") 
@Autowired 用于注入,(srping提供的) 默认按类型装配 
@Transactional( rollbackFor={Exception.class}) 事务管理
@ResponseBody
@Scope("prototype")   设定bean的作用域

<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" 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-3.2.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"> <!-- 对基本进行注解扫描,开启注解 --> <context:component-scan base-package="com.esms"> <!-- 只对controller进行扫描 --> <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" /> </context:component-scan> <!-- Spring的配置文件,这里主要配置和业务逻辑有关的 --> <!--=================== 数据源,事务控制,xxx ================ --> <!-- 加载数据库配置文件dbconfig.properties --> <context:property-placeholder location="classpath:db.properties" /> <!-- 加载数据库 --> <bean id="pooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${datasource.connection.driver_class}"/> <property name="jdbcUrl" value="${datasource.connection.url}"/> <property name="user" value="${datasource.connection.username}"/> <property name="password" value="${datasource.connection.password}"/> <property name="minPoolSize" value="${datasource.connection.minPoolSize}"/> <!--连接池中保留的最大连接数。Default: 15 --> <property name="maxPoolSize" value="${datasource.connection.maxPoolSize}"/> <!--最大空闲时间,60秒内未使用则连接被丢弃。若为0则永不丢弃。Default: 0 --> <property name="maxIdleTime" value="${datasource.connection.maxIdleTime}"/> <!--当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3 --> <property name="acquireIncrement" value="${datasource.connection.acquireIncrement}"/> <!--JDBC的标准参数,用以控制数据源内加载的PreparedStatements数量。但由于预缓存的statements 属于单个connection而不是整个连接池。所以设置这个参数需要考虑到多方面的因素。 如果maxStatements与maxStatementsPerConnection均为0,则缓存被关闭。Default: 0 --> <property name="maxStatements" value="${datasource.connection.maxStatements}"/> <!--maxStatementsPerConnection定义了连接池内单个连接所拥有的最大缓存statements数。Default: 0 --> <property name="maxStatementsPerConnection" value="${datasource.connection.maxStatementsPerConnection}"/> <!--初始化时获取三个连接,取值应在minPoolSize与maxPoolSize之间。Default: 3 --> <property name="initialPoolSize" value="${datasource.connection.initialPoolSize}"/> <!--每60秒检查所有连接池中的空闲连接。Default: 0 --> <property name="idleConnectionTestPeriod" value="${datasource.connection.idleConnectionTestPeriod}"/> <!--定义在从数据库获取新连接失败后重复尝试的次数。Default: 30 --> <property name="acquireRetryAttempts" value="${datasource.connection.acquireRetryAttempts}"/> <!--获取连接失败将会引起所有等待连接池来获取连接的线程抛出异常。但是数据源仍有效 保留,并在下次调用getConnection()的时候继续尝试获取连接。如果设为true,那么在尝试 获取连接失败后该数据源将申明已断开并永久关闭。Default: false --> <property name="breakAfterAcquireFailure" value="${datasource.connection.breakAfterAcquireFailure}"/> <!--因性能消耗大请只在需要的时候使用它。如果设为true那么在每个connection提交的 时候都将校验其有效性。建议使用idleConnectionTestPeriod或automaticTestTable 等方法来提升连接测试的性能。Default: false --> <property name="testConnectionOnCheckout" value="${datasource.connection.testConnectionOnCheckout}"/> <property name="checkoutTimeout" value="${datasource.connection.checkoutTimeout}"/> <property name="testConnectionOnCheckin" value="${datasource.connection.testConnectionOnCheckin}"/> <property name="automaticTestTable" value="${datasource.connection.automaticTestTable}"/> <property name="acquireRetryDelay" value="${datasource.connection.acquireRetryDelay}"/> <!--自动超时回收Connection--> <property name="unreturnedConnectionTimeout" value="${datasource.connection.unreturnedConnectionTimeout}"/> <!--超时自动断开--> <property name="maxIdleTimeExcessConnections" value="${datasource.connection.maxIdleTimeExcessConnections}"/> <property name="maxConnectionAge" value="${datasource.connection.maxConnectionAge}"/> </bean> <!--================== 配置和MyBatis的整合=============== --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 指定mybatis全局配置文件的位置 --> <property name="configLocation" value="classpath:mybatis-config.xml"></property> <property name="dataSource" ref="pooledDataSource"></property> <!-- 指定mybatis,mapper文件的位置 --> <property name="mapperLocations" value="classpath:mappers/*.xml"></property> </bean> <!-- 配置扫描器,将mybatis接口的实现加入到ioc容器中 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 扫描所有dao接口的实现,加入到ioc容器中 --> <property name="basePackage" value="com.esms.dao"></property> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> </bean> <!-- 配置一个可以执行批量的sqlSession --> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"> <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"></constructor-arg> <constructor-arg name="executorType" value="BATCH"></constructor-arg> </bean> <!-- ===============事务控制的配置 ================ --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <!--控制住数据源 --> <property name="dataSource" ref="pooledDataSource"></property> </bean> <!--配置事务增强,事务如何切入 --> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="get*" read-only="true" propagation="SUPPORTS"/> <tx:method name="list*" read-only="true" propagation="SUPPORTS"/> <tx:method name="find*" read-only="true" propagation="SUPPORTS"/> <tx:method name="query*" read-only="true" propagation="SUPPORTS"/> <tx:method name="count*" read-only="true" propagation="SUPPORTS"/> <tx:method name="update*" read-only="false" propagation="REQUIRED"/> <tx:method name="insert*" read-only="false" propagation="REQUIRED"/> <tx:method name="save*" read-only="false" propagation="REQUIRED"/> <tx:method name="delete*" read-only="false" propagation="REQUIRED"/> <tx:method name="remove*" read-only="false" propagation="REQUIRED"/> <tx:method name="*" read-only="true" propagation="REQUIRED"/> </tx:attributes> </tx:advice> <aop:aspectj-autoproxy proxy-target-class="true"/> <!--开启基于注解的事务,使用xml配置形式的事务(必要主要的都是使用配置式) --> <aop:config> <!-- 切入点表达式 --> <!-- 需要修改扫描 --> <aop:pointcut expression="execution(* com.esms.service.impl.*.*(..))" id="txPoint" /> <!-- 配置事务增强 --> <aop:advisor advice-ref="txAdvice" pointcut-ref="txPoint" /> </aop:config> <bean class="com.esms.exception.CustomExceptionResolver"/> </beans>
最新发布
07-19
<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>员工信息</title> <script type="text/javascript" th:src="@{/js/vue.global.js}"></script> </head> <body> <table id="dataTable" border="1" cellspacing="0" cellpadding="0" style="text-align:center"> <tr> <th colspan="5">员工信息</th> </tr> <tr> <th>编号</th> <th>姓名</th> <th>邮箱</th> <th>性别</th> <th>操作</th> </tr> <tr th:each="employee : ${employeeList}"> <td th:text="${employee.id}"></td> <td th:text="${employee.lastName}"></td> <td th:text="${employee.email}"></td> <td th:text="${employee.gender}"></td> <td> <a @click="deleteEmployee" th:href="@{'/employee/' + ${employee.id}}">删除</a> <a href="">修改</a> </td> </tr> </table> <form id="deleteForm" method="post"> <input type="hidden" name="_method" value="delete"> </form> <script type="text/javascript"> var vue = new Vue({ el: "#dataTable", methods: { deleteEmployee: function (event) { var deleteForm = document.getElementById("deleteForm"); deleteForm.action = event.target.href; deleteForm.submit(); event.preventDefault(); } } }); </script> </body> </html> //删除员工信息 @RequestMapping(value = "/employee/{id}",method = RequestMethod.DELETE) public String deleteEmployee(@PathVariable("id") Integer id){ employeeDao.delete(id); return "redirect:/employee"; } <?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"> <!--配置编码过滤器--> <filter> <filter-name>CharacterEncodingFilter</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>forceResponseEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>CharacterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!--配置 处理请求方式put,delete的HiddenHttpmethodFilter--> <filter> <filter-name>hiddenHttpMethodFilter</filter-name> <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class> </filter> <filter-mapping> <filter-name>hiddenHttpMethodFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!--配置SpringMVC的前端控制器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:springMVC.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> </web-app> <?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"> <!--开启组件扫描--> <context:component-scan base-package="com.atguigu.rest"/> <!--配置thymeleaf视图解析器--> <bean id="viewResolver" class="org.thymeleaf.spring5.view.ThymeleafViewResolver"> <property name="order" value="1"/> <property name="characterEncoding" value="UTF-8"/> <property name="templateEngine"> <bean class="org.thymeleaf.spring5.SpringTemplateEngine"> <property name="templateResolver"> <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver"> <!-- 视图前缀 --> <property name="prefix" value="/WEB-INF/templates/"/> <!-- 视图后缀 --> <property name="suffix" value=".html"/> <property name="templateMode" value="HTML5"/> <property name="characterEncoding" value="UTF-8"/> </bean> </property> </bean> </property> </bean> <!--配置视图控制器--> <mvc:view-controller path="/" view-name="index"></mvc:view-controller> <!--开放对静态资源的访问呢--> <mvc:default-servlet-handler></mvc:default-servlet-handler> <!--开启mvc注解驱动--> <mvc:annotation-driven></mvc:annotation-driven> </beans> 报错 405 找不到方法
07-05
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