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Java Responsibility FilterChain

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標籤：

一、目標

增加filterchain功能

 

二、代碼

1.Filter.java

1 public interface Filter {2     public String doFilter(String str);3 }

 

2.FilterChain.java

 1 import java.util.ArrayList; 2 import java.util.List; 3  4 public class FilterChain implements Filter { 5  6     private List<Filter> filters = new ArrayList<Filter>(); 7      8     public String doFilter(String str) { 9         for(Filter f : filters){10             str = f.doFilter(str);11         }12         return str;13     }14 15     //把函數的傳回值設為FilterChain，返回this,就能方便鏈式編寫代碼16     public FilterChain addFilter(Filter filter) {17         filters.add(filter);18         return this;19     }20 21 }

 

3.HTMLFilter.java

1 public class HTMLFilter implements Filter {2 3     @Override4     public String doFilter(String str) {5         return str.replace(‘<‘, ‘[‘).replace(">", "]");6     }7 8 }

 

4.SensitiveFilter.java

1 public class SensitiveFilter implements Filter {2 3     @Override4     public String doFilter(String str) {5         return str.replace("敏感", "幸福");6     }7 8 }

 

5.MsgProcessor.java

 1 public class MsgProcessor { 2      3     //private List<Filter> filters = new ArrayList<Filter>(); 4     FilterChain filterChain; 5     private String msg; 6      7     public FilterChain getFilterChain() { 8         return filterChain; 9     }10 11     public void setFilterChain(FilterChain filterChain) {12         this.filterChain = filterChain;13     }14 15     16     public String getMsg() {17         return msg;18     }19 20     public void setMsg(String msg) {21         this.msg = msg;22     }23 24     public String process() {25         return filterChain.doFilter(msg);26     }27 }

 

6.Test.java

 1 public class Test { 2  3     @org.junit.Test 4     public void testFilter(){ 5          6         MsgProcessor processor = new MsgProcessor(); 7          8         String msg = "<html>敏感字眼</html>";  9         processor.setMsg(msg);10         11         FilterChain fc1 = new FilterChain();12         fc1.addFilter(new HTMLFilter());13         14         FilterChain fc2 = new FilterChain();15         fc2.addFilter(new SensitiveFilter());16         17         //由於FilterChain實現了Filter介面，所以FilterChain同時也是Filter,所以可以調用addFilter增加fc218         fc1.addFilter(fc2);19         20         processor.setFilterChain(fc1);21         22         String result = processor.process();23         System.out.println(result);24         25     }26 27 }

 

三、運行結果

 

Java Responsibility FilterChain

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