filterutil.java

jaguey,网上的一个朋友给我的

package net.javapassion.jaguey.util;

//版本: JagueyBBS 1.1
//功能: 论坛数据过滤
//作者: 赵程佳
//时间: 2006-02-09 12:05:22

public class FilterUtil {

	private static String replace(String mainStr,String oldStr,String newStr) {
		if (mainStr.equals(null)) {
	    	return null;
	    }
	    int i = mainStr.lastIndexOf(oldStr);
	    if (i < 0) {
	    	return mainStr;
	    }
	    StringBuffer mainBuff = new StringBuffer(mainStr);
	    while (i >= 0) {
	      mainBuff.replace(i, i + oldStr.length(), newStr);
	      i = mainStr.lastIndexOf(oldStr, i-1);
	    }
	    return mainBuff.toString();
	}
	
	public String charFilter(String str) {
	    String result = str;
	    result = replace(result, "%", "??");
	    result = replace(result, "'", "??");
	    result = replace(result, "&", "??");
	    result = replace(result, "--", "??");
	    result = replace(result, "\'", "??");
	    result = replace(result, "#", "??");
	    return result;
	}
	
	public String scriptFilter(String str) {
	    String result = str;
	    result = replace(result, "<", "??");
	    result = replace(result, ">", "??");
	    result = replace(result, "&#", "??");
	    return result;
	}
}