java过滤关键字

KeywordFilter.java:
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class KeywordFilter
{
private static Pattern pattern = null;
private static KeywordFilter filter = new KeywordFilter();
public static KeywordFilter getInstance()
{
return (null == filter)?new KeywordFilter():filter;
}
private KeywordFilter()
{
init();
}
private void init()
{
StringBuilder stringBuilder = new StringBuilder();
try
{
InputStream in = KeywordFilter.class
.getResourceAsStream("keyword.properties");
Properties pro = new Properties();

//Thread.sleep(5000);
pro.load(in);
Enumeration<?> enu = pro.propertyNames();
while (enu.hasMoreElements())
{
stringBuilder.append(enu.nextElement() + "|");
}
stringBuilder.deleteCharAt(stringBuilder.length() - 1);
pattern = Pattern.compile(new String(stringBuilder.toString()
.getBytes("ISO-8859-1"), "UTF-8"));
} catch (Exception ex)
{
ex.printStackTrace();
}
}
public String doFilter(String str)
{
Matcher m = pattern.matcher(str);
str = m.replaceAll("***");
return str;
}
}
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：
AV女优|暴力