责任链模式

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客户端

public class Main {public static void main(String[] args) {String msg = "=_=,I'm sorry,I cannot do this!fuck it!=_=,fuck";FilterChain filterChain = new FilterChain();filterChain.add(new CharFilter()).add(new SensitiveFilter());Request request = new Request();request.setMsg(msg);Response response = new Response(); filterChain.doFilter(request, response, filterChain); System.out.println("requestMsg:"+request.getMsg());System.out.println("responseMsg:"+response.getResponseMsg());}}

public interface Filter {

void doFilter(Request request,Response response,FilterChain filterChain);}

public class CharFilter implements Filter{@Overridepublic void doFilter(Request request, Response response,FilterChain filterChain) {String msg = request.getMsg().replace('=', '^')+"----CharFilter";request.setMsg(msg);filterChain.doFilter(request, response, filterChain);String returnMsg = response.getResponseMsg()+"-----CharFilter";response.setResponseMsg(returnMsg);}}
Filter实现2public class SensitiveFilter implements Filter{ @Overridepublic void doFilter(Request request, Response response,FilterChain filterChain) {String msg = request.getMsg().replace("fuck", "****")+"-----SensitiveFilter";request.setMsg(msg);filterChain.doFilter(request, response, filterChain);String returnMsg = response.getResponseMsg()+"-----SensitiveFilter";response.setResponseMsg(returnMsg);}}
FilterChain链，实现回调
public class FilterChain implements Filter{private List<Filter> list = new ArrayList<Filter>();private int index = 0;public FilterChain add(Filter filter){list.add(filter);return this;}public FilterChain remove(Filter filter){if(list.contains(filter)){list.remove(filter);}return this;}@Overridepublic void doFilter(Request request, Response response,FilterChain filterChain) {if(index >= list.size()) return;Filter filter = list.get(index);index++;filter.doFilter(request, response, filterChain);}}

Request，Response里面包含一个String 属性

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