抽丝剥茧设计模式- 责任链模式应用场景
Servlet中应用到责任链模式,下面是仿照实现的代码,请享用!
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | package org.design.behavioral.chain.v4; import java.util.ArrayList; import java.util.List; /* 需求: 处理request,response 请求过来的时候是HtmlFilter处理、SensitiveFilter处理、ScriptFilter处理。 响应返回的时候是ScriptFilter处理、SensitiveFilter处理、HtmlFilter处理。 */ public class ServletFilter { public static void main(String[] args) { Request request = new Request(); request.requestStr = "I am request " ; Response response = new Response(); response.responseStr = "I am response " ; FilterChain filterChain = new FilterChain(); filterChain.add( new HtmlFilter()).add( new SensitiveFilter()).add( new ScriptFilter()); filterChain.doFilter(request, response); System.out.println(request.requestStr); System.out.println(response.responseStr); } } class Request { String requestStr; } class Response { String responseStr; } interface Filter { boolean doFilter(Request request, Response response, FilterChain filterChain); } class HtmlFilter implements Filter { @Override public boolean doFilter(Request request, Response response, FilterChain filterChain) { request.requestStr = request.requestStr + " | HtmlFilter deal!" ; filterChain.doFilter(request, response); response.responseStr = response.responseStr + " | HtmlFilter deal!" ; return true ; } } class SensitiveFilter implements Filter { @Override public boolean doFilter(Request request, Response response, FilterChain filterChain) { request.requestStr = request.requestStr + " | SensitiveFilter deal!" ; filterChain.doFilter(request, response); response.responseStr = response.responseStr + " | SensitiveFilter deal!" ; return true ; } } class ScriptFilter implements Filter { @Override public boolean doFilter(Request request, Response response, FilterChain filterChain) { request.requestStr = request.requestStr + " | ScriptFilter deal!" ; filterChain.doFilter(request, response); response.responseStr = response.responseStr + " | ScriptFilter deal!" ; return true ; } } class FilterChain { List<Filter> filters = new ArrayList<Filter>(); int index = 0 ; FilterChain add(Filter filter) { this .filters.add(filter); return this ; } public boolean doFilter(Request request, Response response) { if (index == filters.size()) return false ; Filter f = filters.get(index); index++; f.doFilter(request, response, this ); return true ; } } |
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