spring security添加自定义filter

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/security"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context-3.0.xsd
		http://www.springframework.org/schema/security
		http://www.springframework.org/schema/security/spring-security.xsd">
		<beans:import resource="/spring-database.xml"/>
		<http use-expressions="true" auto-config="true">
		    <intercept-url pattern="/index.jsp" access="hasRole('ADMIN')"/>
		    <form-login login-page="/login.jsp" login-processing-url="/check_action"
		        username-parameter="username"
		        password-parameter="password"/>
		    <session-management>
		        <concurrency-control max-sessions="1" error-if-maximum-exceeded="true"/>
		    </session-management>
		    <custom-filter ref="myfilter" position="FIRST"/>
		</http>
		<beans:bean id="myfilter" class="com.wyc.filter.MyFilter"></beans:bean>
		<authentication-manager>
		    <authentication-provider>
				<jdbc-user-service data-source-ref="dataSource" 
				    users-by-username-query="select username username,password password,enabled enabled from _user where username=?"
				    authorities-by-username-query="select username username,role role from _user_role where username=?"/>
		    </authentication-provider>
		</authentication-manager>
</beans:beans>

其中，重点语句是

<custom-filter ref="myfilter" position="FIRST"/>

以及

<beans:bean id="myfilter" class="com.wyc.filter.MyFilter"></beans:bean>

MyFilter.java

package com.wyc.filter;

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;

public class MyFilter implements Filter{

	@Override
	public void destroy() {
		// TODO Auto-generated method stub

	}

	@Override
	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		// TODO Auto-generated method stub
		System.out.println("myFilter");
		arg2.doFilter(arg0, arg1);
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub

	}

}

附：其他配置文件以及maven库依赖参见下面文章：

http://blog.csdn.net/wyccyw123456/article/details/51913054