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1、注：文档内容基本上来自于网上，并加上自己的理解而成。有的觉得网友总结得非常好，就完全照搬下来，供学习之用。然而，有的摘抄并没有加上原链接和出处，请谅解。FilterChain例子（本例子模拟回路式的一个链式处理，要求输入按1，2，3这样的处理，而输出则再次需要以3，2，1的方式处理）：publicinterface IFilter {publicvoiddoFilter(Requestrequest,Responseresponse,FilterChainchain);}publicclass HTMLFilter

2、 implementsIFilter{@OverridepublicvoiddoFilter(Requestrequest,Responseresponse,FilterChainchain){StringrequestStr=request.getResquest().replaceAll("<","[").replaceAll(">","]")+"---HTMLFilter";request.setResquest(requestStr);chain.doFilter(request,response);Str

3、ingresponseStr=response.getResponse().replaceAll("\[","<").replaceAll("\]",">")+"----HTMLFilter";response.setResponse(responseStr);}}publicclass SensitiveFilter implementsIFilter{@OverridepublicvoiddoFilter(Requestrequest,Responseresponse,FilterChainchain){/

4、/TODOAuto-generatedmethodstubrequest.setResquest(request.getResquest().replaceAll("sex","six")+"---SensitiveFilter");chain.doFilter(request,response);response.setResponse(response.getResponse().replaceAll("six","seexxx"+"---SensitiveFilter"));}}publicclass Fil

5、terChain {publicListfilterChain=newArrayList();publicintcount=0;publicvoidaddFilter(IFilterfilter){filterChain.add(filter);}publicvoiddoFilter(Requestrequest,Responseresponse){if(count>=filterChain.size())return;filterChain.get(count++).doFil

6、ter(request,response,this);}}测试代码：publicstaticvoidmain(Stringargs[]){Stringstr="

,

.Thisisasexfilm!";Stringstr2="[Haa]Thisisasixfilm!";Requestrequest=newRequest();request.setResquest(str);Responseresponse=newResponse();response.setResponse(str2);FilterCh

7、ainchain=newFilterChain();chain.addFilter(newHTMLFilter());chain.addFilter(newSensitiveFilter());chain.doFilter(request,response);System.out.println("Requeststr:"+request.getResquest());System.out.println("Responsestr:"+response.getResponse());}输出：Requeststr:[

8、H1],[H2].Thisisasixfilm!---HTMLFilter---SensitiveFilterResponsestr:Thisisaseexxx---SensitiveFilterfilm!----HTMLFilter注：链式处理有时候也叫做拦截器处理，其原理差不多。注意上面代码中如何实现对response以处理request刚好相