spring boot 配置Filter过滤器的方法
Filter过滤器是web开发中很重要的一个组件，下面以一个session登陆的例子介绍下springboot中如何使用Filter
首先要准备一个实现了Filter的接口的类SessionFilter：
importorg.slf4j.LoggerFactory;
importjavax.servlet.*;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjavax.servlet.http.HttpSession;
importjava.io.IOException;
importjava.util.ArrayList;
importjava.util.List;
importjava.util.regex.Matcher;
importjava.util.regex.Pattern;
/**
*Createdbymazhenhuaon2016/12/27.
*
*过滤器
*/
publicclassSessionFilterimplementsFilter{
privatestaticfinalorg.slf4j.Loggerlogger=LoggerFactory.getLogger(SessionFilter.class);
/**
*封装，不需要过滤的list列表
*/
protectedstaticListpatterns=newArrayList();
@Override
publicvoidinit(FilterConfigfilterConfig)throwsServletException{
}
@Override
publicvoiddoFilter(ServletRequestservletRequest,ServletResponseservletResponse,FilterChainchain)throwsIOException,ServletException{
HttpServletRequesthttpRequest=(HttpServletRequest)servletRequest;
HttpServletResponsehttpResponse=(HttpServletResponse)servletResponse;
logger.info("aaaaaaaaaa");
Stringurl=httpRequest.getRequestURI().substring(httpRequest.getContextPath().length());
if(url.startsWith("/")&&url.length()>1){
url=url.substring(1);
}
if(isInclude(url)){
chain.doFilter(httpRequest,httpResponse);
return;
}else{
HttpSessionsession=httpRequest.getSession();
if(session.getAttribute("")!=null){
//session存在
chain.doFilter(httpRequest,httpResponse);
return;
}else{
//session不存在准备跳转失败
/*RequestDispatcherdispatcher=request.getRequestDispatcher(path);
dispatcher.forward(request,response);*/
chain.doFilter(httpRequest,httpResponse);
return;
}
}
}
@Override
publicvoiddestroy(){
}
/**
*是否需要过滤
*@paramurl
*@return
*/
privatebooleanisInclude(Stringurl){
for(Patternpattern:patterns){
Matchermatcher=pattern.matcher(url);
if(matcher.matches()){
returntrue;
}
}
returnfalse;
}
}
实际开发中往往有很多请求要直接请求进来，不需要鉴权登陆的，所以代码中过滤掉这种请求的代码，装进list就好了。
/**
*配置过滤器
*@return
*/
@Bean
publicFilterRegistrationBeansomeFilterRegistration(){
FilterRegistrationBeanregistration=newFilterRegistrationBean();
registration.setFilter(sessionFilter());
registration.addUrlPatterns("/*");
registration.addInitParameter("paramName","paramValue");
registration.setName("sessionFilter");
returnregistration;
}
/**
*创建一个bean
*@return
*/
@Bean(name="sessionFilter")
publicFiltersessionFilter(){
returnnewSessionFilter();
}
经过上面这俩步的配置，过滤器基本上就可以了。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。