filter获取spring的bean
这是我学习过程中的例子,filter直接获取spring的bean
1、spring容器是不可以注入filter的,有些人说他们俩是平级关系
2、spring处理的是servlet,filter类似于是他外面包裹的一层网。
spring配置:
我用的是mybatis的接口注入
<?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:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"
default-lazy-init="true">
<description>spring配置</description>
<!-- 加载数据库文件 -->
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:config.properties" />
</bean>
<!-- 配置数据库dbcp池链接 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${driver}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
<!-- 初始化连接大小 -->
<property name="initialSize" value="${initialSize}"></property>
<!-- 连接池最大数量 -->
<property name="maxActive" value="${maxActive}"></property>
<!-- 连接池最大空闲 -->
<property name="maxIdle" value="${maxIdle}"></property>
<!-- 连接池最小空闲 -->
<property name="minIdle" value="${minIdle}"></property>
<!-- 获取连接最大等待时间 -->
<property name="maxWait" value="${maxWait}"></property>
</bean>
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<tx:advice id ="txAdvice" transaction-manager="txManager">
<tx:attributes>
<tx:method name="get*" read-only="true"/>
<tx:method name="select*" read-only="true"/>
<tx:method name="queryFor*" read-only="true"/>
<tx:method name="*"/>
</tx:attributes>
</tx:advice>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" >
<property name="dataSource" ref="dataSource"></property>
<!-- 自动扫描mapping.xml文件 删除正常
<property name="mapperLocations" value="classpath:com/botech/skynet/base/persistence/*.xml" />
-->
</bean>
<!-- 配置sqlSessionTemplate -->
<bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="sqlSessionFactory" />
</bean>
<!-- 配置mybatis的sqlMap及接口的映射 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.botech.skynet.base.persistence"/>
</bean>
<!-- 扫描控件,不包括controller -->
<context:component-scan base-package="com.botech">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
</beans>
fliter源码:
package com.botech.skynet.common;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import com.botech.ywzx.index.service.IUserService;
import com.botech.ywzx.index.vo.User;
/**
* Servlet Filter implementation class LoginFilter
*/
public class LoginFilter implements Filter {
/**
* Default constructor.
*/
public LoginFilter() {
// TODO Auto-generated constructor stub
}
/**
* @see Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
System.out.println("销毁----------------------------->");
}
/**
* @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
// place your code here
UserService userService= (IUserService) wac.getBean("userService");
User u = userService.getUserById(1);
System.out.println("获取springbean成功:"+u.getUserName());
// pass the request along the filter chain
chain.doFilter(request, response);
}
/**
* @see Filter#init(FilterConfig)
*/
private WebApplicationContext wac;
public void init(FilterConfig fConfig) throws ServletException {
System.out.println("初始化:------------------------------>"+fConfig);
wac =WebApplicationContextUtils.getRequiredWebApplicationContext( fConfig.getServletContext());
// wac = WebApplicationContextUtils.getWebApplicationContext(
// this.getServletContext());
// TODO Auto-generated method stub
}
}