Design Pattern-responsibility chain pattern

1. responsibility chain

1 package com.alvin;2 3 public interface Filter {4     public String doFilter(String str);5 }

1 package com.alvin;2 3 public class HtmlFilter implements Filter{4 5     public String doFilter(String str) {6         return str.replace(‘<‘, ‘[‘).replace(‘>‘, ‘]‘);7     }8 9 }

1 package COM. alvin; 2 3 Public class wordsfilter implements filter {4 5 @ override 6 Public String dofilter (string Str) {7 // todo auto-generated method stub 8 return Str. replace ("Inscription", "crab"); 9} 10 11}

 1 package com.alvin; 2  3 public class MesProcessor { 4     private String msg; 5     Filter [] filters = {new HtmlFilter(), new WordsFilter()}; 6  7     public String getMsg() { 8         return msg; 9     }10 11     public void setMsg(String msg) {12         this.msg = msg;13     }14     15     public String process(){16         String r = msg;17         for (Filter f : filters) {18             r = f.doFilter(r);19         }20         return r;21     }22 }

1 package COM. alvin; 2 3 Public class main {4 public static void main (string [] ARGs) {5 string MSG = "<SCRIPT>,:), kdkjfejfid, sensitive word :)"; 6 mesprocessor MP = new mesprocessor (); 7 MP. setmsg (MSG); 8 string result = MP. process (); 9 system. out. println (result); 10} 11}

Test results: [script], :), kdkjfejfid, crab :)

2. Improve the array and use arraylist to add the filterchain class.

 1 package com.alvin; 2  3 import java.util.ArrayList; 4 import java.util.List; 5  6 public class FilterChain { 7     List<Filter> filters = new ArrayList<>(); 8  9     public void addFilter(Filter f) {10         filters.add(f);11     }12 13     public String doFilter(String str) {14         for (Filter filter : filters) {15             str = filter.doFilter(str);16         }17         return str;18     }19 }

 

Modify mesprocessor

 1 package com.alvin; 2  3 public class MesProcessor { 4     private String msg; 5     FilterChain filterChain; 6  7     public FilterChain getFilterChain() { 8         return filterChain; 9     }10 11     public void setFilterChain(FilterChain filterChain) {12         this.filterChain = filterChain;13     }14 15     public String getMsg() {16         return msg;17     }18 19     public void setMsg(String msg) {20         this.msg = msg;21     }22 23     public String process() {24         return filterChain.doFilter(msg);25     }26 }

Test class

1 package COM. alvin; 2 3 Public class main {4 public static void main (string [] ARGs) {5 string MSG = "<SCRIPT>,:), kdkjfejfid, sensitive word :)"; 6 mesprocessor MP = new mesprocessor (); 7 MP. setmsg (MSG); 8 filterchain = new filterchain (); 9 filterchain. addfilter (New htmlfilter (); 10 filterchain. addfilter (New wordsfilter (); 11 MP. setfilterchain (filterchain); 12 string result = MP. process (); 13 system. out. println (result); 14} 15}

Test results: [script], :), kdkjfejfid, crab :)

 

Design Pattern-responsibility chain pattern