【设计模式-05】Facade门面Mediator调停者 | Decorator装饰器

Facade门面Mediator调停者

1、Facade门面图解

2、Mediator调停者

一般是系统内部相互交错，比如消息中间件(MQ)就是这种设计模式，对各个功能或系统之间进行解耦。

Decorator装饰器

1、问题

2、解决方案

Chain Of Responsibility责任链

一、例子场景

业务场景：论坛或者博客发表帖子或者评论，对敏感词过滤处理。使用责任链的模式进行过滤处理。

二、没有使用设计模式之前

/**
* @description: 责任链模式
* @author: flygo
* @time: 2022/7/18 09:51
*/
public class CorMain {public static void main(String[] args) {Msg msg = new Msg();msg.setMsg("大家好:), <script> 欢迎访问 baidu.com，大家都是996");// 处理msgString r = msg.getMsg();r = r.replace('<', '[');r = r.replace('>', ']');msg.setMsg(r);r = r.replaceAll("996", "955");msg.setMsg(r);System.out.println(msg);}
}class Msg {String name;String msg;public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}@Overridepublic String toString() {return "Msg{" + "msg='" + msg + '\'' + '}';}
}

二、使用Filter封装处理

把变化的进行封装处理

/*** @description: 责任链模式* @author: flygo* @time: 2022/7/18 09:51*/
public class CorMain {public static void main(String[] args) {Msg msg = new Msg();msg.setMsg("大家好:), <script> 欢迎访问 baidu.com，大家都是996");// 处理msgnew HTMLFilter().doFilter(msg);new SensitiveFilter().doFilter(msg);System.out.println(msg);}
}class Msg {String name;String msg;public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}@Overridepublic String toString() {return "Msg{" + "msg='" + msg + '\'' + '}';}
}interface Filter {void doFilter(Msg m);
}class HTMLFilter implements Filter {@Overridepublic void doFilter(Msg m) {String r = m.getMsg();r = r.replace('<', '[');r = r.replace('>', ']');m.setMsg(r);}
}class SensitiveFilter implements Filter {@Overridepublic void doFilter(Msg m) {// 处理msgString r = m.getMsg();r = r.replaceAll("996", "955");m.setMsg(r);}
}

三、使用Filter封装的串在一起

核心代码实现

import java.util.ArrayList;
import java.util.List;/*** @description: 责任链模式* @author: flygo* @time: 2022/7/18 09:51*/
public class CorMain {public static void main(String[] args) {Msg msg = new Msg();msg.setMsg("大家好:), <script> 欢迎访问 baidu.com，大家都是996");List<Filter> filterList = new ArrayList<>();filterList.add(new HTMLFilter());filterList.add(new SensitiveFilter());for (Filter f : filterList) {f.doFilter(msg);}System.out.println(msg);}
}class Msg {String name;String msg;public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}@Overridepublic String toString() {return "Msg{" + "msg='" + msg + '\'' + '}';}
}interface Filter {void doFilter(Msg m);
}class HTMLFilter implements Filter {@Overridepublic void doFilter(Msg m) {String r = m.getMsg();r = r.replace('<', '[');r = r.replace('>', ']');m.setMsg(r);}
}class SensitiveFilter implements Filter {@Overridepublic void doFilter(Msg m) {// 处理msgString r = m.getMsg();r = r.replaceAll("996", "955");m.setMsg(r);}
}

四、使用Filter链条串一起

import java.util.ArrayList;
import java.util.List;/*** @description: 责任链模式* @author: flygo* @time: 2022/7/18 09:51*/
public class CorMain {public static void main(String[] args) {Msg msg = new Msg();msg.setMsg("大家好:), <script> 欢迎访问 baidu.com，大家都是996");FilterChain filterChain = new FilterChain();filterChain.add(new HTMLFilter());filterChain.add(new SensitiveFilter());filterChain.doFilter(msg);System.out.println(msg);}
}class Msg {String name;String msg;public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}@Overridepublic String toString() {return "Msg{" + "msg='" + msg + '\'' + '}';}
}interface Filter {void doFilter(Msg m);
}class HTMLFilter implements Filter {@Overridepublic void doFilter(Msg m) {String r = m.getMsg();r = r.replace('<', '[');r = r.replace('>', ']');m.setMsg(r);}
}class SensitiveFilter implements Filter {@Overridepublic void doFilter(Msg m) {// 处理msgString r = m.getMsg();r = r.replaceAll("996", "955");m.setMsg(r);}
}class FilterChain {List<Filter> filterList = new ArrayList<>();public void add(Filter filter) {filterList.add(filter);}public void doFilter(Msg m) {for (Filter f : filterList) {f.doFilter(m);}}
}

五、两个链条串一起

import java.util.ArrayList;
import java.util.List;/*** @description: 责任链模式* @author: flygo* @time: 2022/7/18 09:51*/
public class CorMain {public static void main(String[] args) {Msg msg = new Msg();msg.setMsg("大家好:), <script> 欢迎访问 baidu.com，大家都是996");FilterChain filterChain1 = new FilterChain();filterChain1.add(new HTMLFilter()).add(new SensitiveFilter());FilterChain filterChain2 = new FilterChain();filterChain2.add(new FaceFilter()).add(new URLFilter());filterChain1.add(filterChain2);filterChain1.doFilter(msg);System.out.println(msg);}
}class Msg {String name;String msg;public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}@Overridepublic String toString() {return "Msg{" + "msg='" + msg + '\'' + '}';}
}interface Filter {void doFilter(Msg m);
}class HTMLFilter implements Filter {@Overridepublic void doFilter(Msg m) {String r = m.getMsg();r = r.replace('<', '[');r = r.replace('>', ']');m.setMsg(r);}
}class SensitiveFilter implements Filter {@Overridepublic void doFilter(Msg m) {// 处理msgString r = m.getMsg();r = r.replaceAll("996", "955");m.setMsg(r);}
}class FaceFilter implements Filter {@Overridepublic void doFilter(Msg m) {// 处理msgString r = m.getMsg();r = r.replace(":)", "^v^");m.setMsg(r);}
}class URLFilter implements Filter {@Overridepublic void doFilter(Msg m) {// 处理msgString r = m.getMsg();r = r.replace("baidu.com", "https://www.baidu.com");m.setMsg(r);}
}class FilterChain implements Filter {List<Filter> filterList = new ArrayList<>();public FilterChain add(Filter filter) {filterList.add(filter);return this;}@Overridepublic void doFilter(Msg m) {for (Filter f : filterList) {f.doFilter(m);}}
}

六、由FilterChain中的某一个Filter决定链条是否继续

import java.util.ArrayList;
import java.util.List;/*** @description: 责任链模式* @author: flygo* @time: 2022/7/18 09:51*/
public class CorMain {public static void main(String[] args) {Msg msg = new Msg();msg.setMsg("大家好:), <script> 欢迎访问 baidu.com，大家都是996");FilterChain filterChain1 = new FilterChain();filterChain1.add(new HTMLFilter()).add(new SensitiveFilter());FilterChain filterChain2 = new FilterChain();filterChain2.add(new FaceFilter()).add(new URLFilter());filterChain1.add(filterChain2);filterChain1.doFilter(msg);System.out.println(msg);}
}class Msg {String name;String msg;public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}@Overridepublic String toString() {return "Msg{" + "msg='" + msg + '\'' + '}';}
}interface Filter {boolean doFilter(Msg m);
}class HTMLFilter implements Filter {@Overridepublic boolean doFilter(Msg m) {String r = m.getMsg();r = r.replace('<', '[');r = r.replace('>', ']');m.setMsg(r);return true;}
}class SensitiveFilter implements Filter {@Overridepublic boolean doFilter(Msg m) {// 处理msgString r = m.getMsg();r = r.replaceAll("996", "955");m.setMsg(r);return false;}
}class FaceFilter implements Filter {@Overridepublic boolean doFilter(Msg m) {// 处理msgString r = m.getMsg();r = r.replace(":)", "^v^");m.setMsg(r);return true;}
}class URLFilter implements Filter {@Overridepublic boolean doFilter(Msg m) {// 处理msgString r = m.getMsg();r = r.replace("baidu.com", "https://www.baidu.com");m.setMsg(r);return true;}
}class FilterChain implements Filter {List<Filter> filterList = new ArrayList<>();public FilterChain add(Filter filter) {filterList.add(filter);return this;}@Overridepublic boolean doFilter(Msg m) {for (Filter f : filterList) {if (!f.doFilter(m)) {return false;}}return false;}
}

七、模拟Java中的ServletFilter 和FilterChain实现

import java.util.ArrayList;
import java.util.List;/*** @description: 责任链模式* @author: flygo* @time: 2022/7/18 09:51*/
public class ServletMain {public static void main(String[] args) {Request request = new Request();request.str = "大家好:), <script> 欢迎访问 baidu.com，大家都是996";Response response = new Response();response.str = "response";FilterChain filterChain = new FilterChain();filterChain.add(new HTMLFilter()).add(new SensitiveFilter());filterChain.doFilter(request, response);System.out.println(request.str);System.out.println(response.str);}
}class Request {String str;
}class Response {String str;
}interface Filter {boolean doFilter(Request request, Response response, FilterChain chain);
}class HTMLFilter implements Filter {@Overridepublic boolean doFilter(Request request, Response response, FilterChain chain) {request.str = request.str.replaceAll("<", "[").replaceAll(">", "]") + "----HTMLFilter";chain.doFilter(request, response);response.str += "----HTMLFilter";return true;}
}class SensitiveFilter implements Filter {@Overridepublic boolean doFilter(Request request, Response response, FilterChain chain) {request.str = request.str.replaceAll("996", "955") + "----SensitiveFilter";chain.doFilter(request, response);response.str += "----SensitiveFilter";return true;}
}class FilterChain {List<Filter> filterList = new ArrayList<>();int index = 0;public FilterChain add(Filter filter) {filterList.add(filter);return this;}public boolean doFilter(Request request, Response response) {if (filterList.size() == index) {return false;}Filter f = filterList.get(index);index++;return f.doFilter(request, response, this);}
}

八、源码地址

GitHub - jxaufang168/Design-Patterns: 设计模式学习设计模式学习. Contribute to jxaufang168/Design-Patterns development by creating an account on GitHub.https://github.com/jxaufang168/Design-Patterns