java过滤关键字

KeywordFilter.java:

   1. import java.io.InputStream;  
   2. import java.util.Enumeration;  
   3. import java.util.Properties;  
   4. import java.util.regex.Matcher;  
   5. import java.util.regex.Pattern;  
   6.   
   7. public class KeywordFilter  
   8. {  
   9.     private static Pattern pattern = null;  
  10.   
  11.     private static KeywordFilter filter = new KeywordFilter();  
  12.   
  13.     public static KeywordFilter getInstance()  
  14.     {  
  15.         return (null == filter)?new KeywordFilter():filter;  
  16.     }  
  17.   
  18.     private KeywordFilter()  
  19.     {  
  20.         init();  
  21.     }  
  22.   
  23.     private void init()  
  24.     {  
  25.         StringBuilder stringBuilder = new StringBuilder();  
  26.   
  27.         try  
  28.         {  
  29.             InputStream in = KeywordFilter.class  
  30.                     .getResourceAsStream("keyword.properties");  
  31.   
  32.             Properties pro = new Properties();  
  33.               
  34.             //Thread.sleep(5000);  
  35.   
  36.             pro.load(in);  
  37.   
  38.             Enumeration<?> enu = pro.propertyNames();  
  39.   
  40.             while (enu.hasMoreElements())  
  41.             {  
  42.                 stringBuilder.append(enu.nextElement() + "|");  
  43.             }  
  44.   
  45.             stringBuilder.deleteCharAt(stringBuilder.length() - 1);  
  46.   
  47.             pattern = Pattern.compile(new String(stringBuilder.toString()  
  48.                     .getBytes("ISO-8859-1"), "UTF-8"));  
  49.   
  50.         } catch (Exception ex)  
  51.         {  
  52.             ex.printStackTrace();  
  53.         }  
  54.     }  
  55.   
  56.     public String doFilter(String str)  
  57.     {  
  58.         Matcher m = pattern.matcher(str);  
  59.   
  60.         str = m.replaceAll("***");  
  61.   
  62.         return str;  
  63.     }  
  64.   
  65. }  

keyword.properties文件放在同一目录下，其内容就是要屏蔽的词语的集合，每个词语用“|”分割

如下

暴力|血腥