SpringWeb 获取 Bean

V2EX = way to explore

V2EX 是一个关于分享和探索的地方

现在注册

已注册用户请登录

这是一个创建于 2760 天前的主题，其中的信息可能已经有所发展或是发生改变。

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=UTF-8</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)

7 条回复 • 2017-05-16 00:00:42 +08:00