设计模式之——责任链模式

1 责任链

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("铭感词", "河蟹");
 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, 敏感词:)";
 6         MesProcessor mp = new MesProcessor();
 7         mp.setMsg(msg);
 8         String result = mp.process();
 9         System.out.println(result);
10     }
11 }

测试结果为：[script],:),kdkjfejfid, 河蟹:)

2 改进数组，采用ArrayList，增加FilterChain类

 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 }

修改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 }

测试类

 1 package com.alvin;
 2
 3 public class Main {
 4     public static void main(String[] args) {
 5         String msg = "<script>,:),kdkjfejfid, 敏感词:)";
 6         MesProcessor mp = new MesProcessor();
 7         mp.setMsg(msg);
 8         FilterChain 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 }

测试结果：[script],:),kdkjfejfid, 河蟹:)