util.java

ajax+jsp留言本,大家可以免费下载

package com.javacms;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.DateFormat;
import java.text.ParseException;
import java.util.Date;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;

public class Util {	
		//转码GBK转ISO
	    public static String toUTF(String inputString)
		{
	        try
			{
	        	byte[] bytes = inputString.getBytes("ISO8859-1");
	        	return new String(bytes,"UTF-8");
	        }catch(Exception e) 
			{
	        	
	        }
	        return inputString;
	    }
	    
	    //转码IS0转GBK
	    public static String toGBK(String inputString)
		{
	    	 try
				{
		        	byte[] bytes = inputString.getBytes("UTF-8");
		        	return new String(bytes,"GBK");
		        }catch(Exception ex) 
				{
		        }
		        return inputString;
	    }
	    
		/**
		 * 
		 * <p>字符串替换方法,防止脚本攻击，和SQL注入</p>
		 * @param oldString
		 * @return 新的字符串
		 */
	    public static String replace(String oldString){
			StringBuffer buf = new StringBuffer();
			for (int i = 0;i<oldString.length();i++){
				buf.append(toHtml(oldString.charAt(i)));
			}
			return buf.toString();
		}
	    /**
	     * 得到经过转换的字符串
	     * @param oldString
	     * @return
	     */
	    public static String toStr(String oldString){
			String str="";
			str=oldString.replaceAll("&amp;","&");
			str=str.replaceAll("&lt;","<");
			str=str.replaceAll("&gt;",">");
			str=str.replaceAll("&quot;","\"");
			str=str.replaceAll("&nbsp;"," ");
			str=str.replaceAll("&39","\'");
			str=str.replaceAll("\\[AT\\]","\\@");
			str=str.replaceAll("\\[MY\\]","\\$");
			str=str.replaceAll("\\[XH\\]","\\_");
			str=str.replaceAll("\\[BF\\]","\\%");
			str=str.replaceAll("\\[HC\\]","<br>");
			return str;
		}
	    
	    private static String toHtml(int i){
			if (i=='&') return "&amp;";
			else if (i=='<') return "&lt;";
			else if (i=='>') return "&gt;";
			else if (i=='>') return "&nbsp;";
			else if (i=='"') return "&quot;";
			else if (i=='\'') return "&39";
			else if (i=='%') return "[BF]";
			else if (i=='@') return "[AT]";
			else if (i=='$') return "[MY]";
			else if (i=='_') return "[XH]";
			else if(i=='\n') return "[HC]";
			else return ""+(char)i;
		}
	        
}