学习日记-责任链设计模式

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责任链设计模式：都说面向对象挺难的，所以我专门请教了朋友一下关于如何学习面向对象的方法，朋友建议我看一下设计模式方面的东西，于是我就开始了学习设计模式，下面是我学习的一些心得：首先是责任链设计模式：我理解的责任链就是将一些需要处理的事件装到一个容器里，要被处理的事件从该容器里穿过之后，出来之后就已经完成了一串的处理过程！像这样的例子我首先想到的就是过滤器，下面是一个小例子：//实现给出一字符串我们将其中的敏感词汇，和一些html信息进行处理//定义filter接口,面向接口编程有比较好的扩展性package com.bj.filter;public interface Filter {void doFilter(Request request,Response response,FilterChain chain);}//定义处理链条的类package com.bj.filter;import java.util.ArrayList;public class FilterChain implements Filter{ArrayList<Filter>filters=new ArrayList<Filter>();int index=0;public FilterChain addFilter(Filter f){ filters.add(f); return this;}@Overridepublic void doFilter(Request request, Response response, FilterChain chain) {// TODO Auto-generated method stubif(index==filters.size())return;Filter f=filters.get(index);f.doFilter(request,response,chain);index++;}}//定义几个filter的实现类，package com.bj.filter;//处理html信息的类public class HtmlFilter implements Filter {@Overridepublic void doFilter(Request request, Response response, FilterChain chain) {// TODO Auto-generated method stubrequest.requestStr=request.getRequestStr().replace("<", "[").replace(">", "]");chain.doFilter(request,response,chain);response.setReponseStr("hahhaha");}}//处理敏感词汇的类package com.bj.filter;public class SensitiveFilter implements Filter{@Overridepublic void doFilter(Request request,Response response,FilterChain chain) {// TODO Auto-generated method stubrequest.requestStr=request.getRequestStr().replace("敏感", "haha");chain.doFilter(request, response, chain);response.getReponseStr().replace("haha", "hehe");}}//定义请求类package com.bj.filter;public class Request {String requestStr;public String getRequestStr() {return requestStr;}public void setRequestStr(String requestStr) {this.requestStr = requestStr;}}//定义应答类package com.bj.filter;public class Response {String reponseStr;public String getReponseStr() {return reponseStr;}public void setReponseStr(String reponseStr) {this.reponseStr = reponseStr;}}//定义处理方式的类package com.bj.filter;import java.util.ArrayList;import com.bj.filter.*;public class MsgProcessor {private String msg;//Filter[]  filters={new HtmlFilter(),new SensitiveFilter()};private FilterChain fc;public FilterChain getFc() {return fc;}//public void setFc(FilterChain fc) {//this.fc = fc;//}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}public String process(String str){String r = null;//r=fc.doFilter(str);return r;}public void setFc(FilterChain fc2) {// TODO Auto-generated method stubthis.fc=fc2;}}//下面是测试类package com.bj.filter;import java.util.ArrayList;public class Main {public static void main(String[] args) {String msg="大记号：）<sad>敏感";Request request=new Request();request.setRequestStr(msg);Response response=new Response();response.setReponseStr("response");FilterChain fc=new FilterChain();fc.addFilter(new HtmlFilter());fc.doFilter(request, response, fc);System.out.println(request);System.out.println(response);}}上边的程序开始执行后会将给出的字符串中的敏感词汇给替换掉。------- android培训、java培训、期待与您交流！ ----------