SpringWeb 获取 Bean

Spring 4.3.8

配置： config/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:cOntext="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- 自动扫描注解，管理 bean --> <context:component-scan base-package="com.pay.service.*,com.pay.dao.*"/> <context:component-scan base-package="com.pay.model.*,com.pay.dto.*"/> <!-- 1.1 加载数据库配置文件 --> <context:property-placeholder location="classpath:jdbc.properties"/> <!-- 1.2 配置 Druid 数据源 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close"> <!-- 配置连接池属性 --> <property name="driverClassName" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> <!-- 配置初始化大小、最小、最大 --> <property name="initialSize" value="${initialSize}"/> <property name="minIdle" value="${minIdle}"/> <property name="maxActive" value="${maxActive}"/> <!-- 配置获取连接等待超时的时间 --> <property name="maxWait" value="60000"/> <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000"/> <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="300000"/> <property name="validationQuery" value="SELECT 'x'"/> <property name="testWhileIdle" value="true"/> <property name="testOnBorrow" value="false"/> <property name="testOnReturn" value="false"/> <!-- 打开 PSCache，并且指定每个连接上 PSCache 的大小 --> <property name="poolPreparedStatements" value="true"/> <property name="maxPoolPreparedStatementPerConnectionSize" value="20"/> <!-- 配置监控统计拦截的 filters，去掉后监控界面 sql 无法统计 --> <property name="filters" value="stat"/> </bean> <!-- 1.3 Spring 和 MyBatis 整合，配置 sqlSessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 数据库连接池 --> <property name="dataSource" ref="dataSource"/> <!-- 配置 Mybatis 全局配置文件 --> <property name="configLocation" value="classpath:/config/mybatis-config.xml"/> <!-- 自动扫描 mapping.xml 文件 --> <property name="mapperLocations" value="classpath:/mapper/*.xml"/> </bean> <!-- 1.4 扫描 Dao 接口，Spring 会自动查找其下的类，注入到 spring 容器中 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 扫描包路径，如果需要扫描多个包，中间使用半角逗号分割 --> <property name="basePackage" value="com.pay.dao"/> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> </bean> <!-- 获取实体 bean 工具类 --> <bean id="beanFactoryUtil" class="com.pay.util.BeanFactoryUtil" lazy-init="false" scope="singleton"/> <!-- druid 日志 --> <bean id="logFilter" class="com.alibaba.druid.filter.logging.Slf4jLogFilter"> <property name="statementExecutableSqlLogEnable" value="true"/> </bean> <!-- 事务管理 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> <!-- 配置事务的注解方式注入，开启对 Class 的动态代理功能 --> <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/> </beans> 

config/applicationContext-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:cOntext="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd"> <!-- 自动扫描包，使 SpringMVC 认为包下用了 @controller 注解的类都是控制器 --> <context:component-scan base-package="com.pay.controller"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/> <context:include-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/> </context:component-scan> <!-- 配置 SpringMVC --> <!-- 1.开启 SpringMVC 注解模式 --> <!-- 简化配置： (1)自动注册 DefaultAnootationHandlerMapping,AnotationMethodHandlerAdapter (2)提供一些列：数据绑定，数字和日期的 format @NumberFormat, @DateTimeFormat, xml,json 默认读写支持 --> <!-- 扩充了注解驱动，可以将请求参数绑定到控制器参数 --> <mvc:annotation-driven> <mvc:message-converters register-defaults="true"> <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/> <bean class="org.springframework.http.converter.FormHttpMessageConverter"/> <bean class="org.springframework.http.converter.xml.SourceHttpMessageConverter"/> <bean class="org.springframework.http.converter.StringHttpMessageConverter"> <constructor-arg index="0" value="utf-8"/> <property name="supportedMediaTypes"> <list> <value>text/plain;charset=</value> </list> </property> </bean> <!-- 配置 Fastjson 支持 --> <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"> <property name="supportedMediaTypes" value="application/json"/> </bean> </mvc:message-converters> </mvc:annotation-driven> <!-- 避免出现乱码 --> <!-- 2.静态资源默认 servlet 配置 (1)加入对静态资源的处理：js,gif,png (2)允许使用"/"做整体映射 --> <mvc:default-servlet-handler /> <mvc:resources mapping="/img/" location="resource/images"/> <mvc:resources mapping="/js/" location="resource/Javascript"/> <mvc:resources mapping="/css/" location="resource/css"/> <!-- 上传(Servlet3.1) --> <bean id="multipartResolver" class="org.springframework.web.multipart.support.StandardServletMultipartResolver" /> <!-- 3. 定义跳转文件的前后缀--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!--<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>--> <property name="prefix" value="/WEB-INF/pages/"/> <property name="suffix" value=".jsp"/> </bean> <!-- 拦截器 --> <mvc:interceptors> <mvc:interceptor> <mvc:mapping path="/admin/**"/> <mvc:exclude-mapping path="/admin/logout"/> <bean id="adminInterceptor" class="com.pay.Interceptor.AdminInterceptor"/> </mvc:interceptor> </mvc:interceptors> </beans> 

web.xml

<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" metadata-complete="true"> <welcome-file-list> <welcome-file>admin/login</welcome-file> </welcome-file-list> <!-- 加载 Spring 容器 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:config/applicationContext.xml</param-value> </context-param> <!-- 防止 spring 内存溢出监听器 --> <listener> <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class> </listener> <!-- 配置 SpringMVC DispatcherServlet --> <servlet> <servlet-name>SpringMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:config/applicationContext-mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> <async-supported>true</async-supported> <!--<multipart-config>--> <!--<location>/</location>--> <!--<max-file-size>2097152</max-file-size>--> <!--<max-request-size>4194304</max-request-size>--> <!--</multipart-config>--> </servlet> <servlet-mapping> <servlet-name>SpringMVC</servlet-name> <!-- 默认匹配所有的请求 --> <url-pattern>/</url-pattern> </servlet-mapping> <!-- 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>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>CharacterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 加载 log4j 的配置文件 log4j.properties --> <context-param> <param-name>log4jConfigLocation</param-name> <param-value>classpath:log4j.xml</param-value> </context-param>s <!-- Session 超时时间 (分钟)--> <session-config> <session-timeout>15</session-timeout> </session-config> </web-app> 

写了一个 Bean 获取的工具类 com.pay.util.BeanFactoryUtil

package com.pay.util; import org.springframework.beans.BeansException; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.stereotype.Component; @Component public class BeanFactoryUtil implements ApplicationContextAware { public BeanFactoryUtil() { } // spring 上下文对象 private static ApplicationContext applicationContext; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { this.applicatiOnContext= applicationContext; } public static Object getBeanByName(String beanName) throws BeansException{ return applicationContext.getBean(beanName); } public static Object getBeanByClass(Object beanClass) throws BeansException{ return applicationContext.getBean(beanClass.getClass()); } public static <T> T getBeanByNameAndClass(String beanName, Class<T> requiredType) throws BeansException { return applicationContext.getBean(beanName, requiredType); } } 

使用这个 util 获取 bean。。。直接报

获取写法：

 @RequestMapping(value = "/admin/json") @ResponseBody public PaymentInfo json() { // PaymentInfo paymentInfo = BeanFactoryUtil.getBeanByNameAndClass("PaymentInfo",PaymentInfo.class); PaymentInfo paymentInfo = (PaymentInfo) BeanFactoryUtil.getBeanByClass(PaymentInfo.class); paymentInfo.setBookfees("aaaaaaaa"); paymentInfo.setDepartment("asdas"); paymentInfo.setDirection("vccccccccc"); return paymentInfo; } 

javax.servlet.ServletException: org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.lang.Class<?>' available at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) at org.eclipse.jetty.server.Server.handle(Server.java:564) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:317) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124) at org.eclipse.jetty.util.thread.Invocable.invokePreferred(Invocable.java:128) at org.eclipse.jetty.util.thread.Invocable$InvocableExecutor.invoke(Invocable.java:222) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:294) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:199) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:672) at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:590) at java.lang.Thread.run(Thread.java:745)