JAVAでのSQL注入防止(特殊文字フィルタ方式)

<SCRIPT language="JavaScript">    
function Check(theform)    
{    
if (theform.UserName.value=="")    
{    
alert("      ！")    
theform.UserName.focus();    
return (false);    
}    
if (theform.Password.value == "")    
{    
alert("     ！");    
theform.Password.focus();    
return (false);    
}    
}    
function IsValid( oField )    
{    
re= /select|update|delete|exec|count|'|"|=|;|>|<|%/i;    
$sMsg = "               SQL   ！"    
if ( re.test(oField.value) )    
{    
alert( $sMsg );    
oField.value = '';    
oField.focus();    
return false;    
}    
}    
</SCRIPT> 

package cn.com.hbivt.util;   
public class StringUtils {   
       //                
       private static String[][] FilterChars={{"<","&lt;"},{">","&gt;"},{" ","&nbsp;"},{"\"","&quot;"},{"&","&amp;"},   
                                       {"/","&#47;"},{"\\","&#92;"},{"
","<br>"}};   
       //    javascript             
       private static String[][] FilterScriptChars={{"
","\'+\'\
\'+\'"},   
                                                           {"\r"," "},{"\\","\'+\'\\\\\'+\'"},   
                                                                   {"\'","\'+\'\\\'\'+\'"}};   
  
       /**  
        *              
        * @param strings            
        * @param spilit_sign       
        * @return        
        */  
       public static String stringConnect(String[] strings,String spilit_sign){   
         String str="";   
         for(int i=0;i<strings.length;i++){   
           str+=strings[i]+spilit_sign;   
         }   
         return str;   
       }   
  
       /**  
        *               
        * @param str          
        * @return          
        */  
       public static String stringFilter(String str){   
         String[] str_arr=stringSpilit(str,"");   
         for(int i=0;i<str_arr.length;i++){   
           for(int j=0;j<FilterChars.length;j++){   
             if(FilterChars[j][0].equals(str_arr[i]))   
               str_arr[i]=FilterChars[j][1];   
           }   
         }   
         return (stringConnect(str_arr,"")).trim();   
       }   
  
       /**  
*           （     (
)    (\r)）  
* @param str            
* @return          
* 2004-12-21    
*/  
public static String stringFilterScriptChar(String str){   
String[] str_arr=stringSpilit(str,"");   
for(int i=0;i<str_arr.length;i++){   
   for (int j = 0; j < FilterScriptChars.length; j++) {   
     if (FilterScriptChars[j][0].equals(str_arr[i]))   
       str_arr[i] = FilterScriptChars[j][1];   
   }   
}   
return(stringConnect(str_arr,"")).trim();   
}   
  
  
       /**  
        *        
        * @param str          
        * @param spilit_sign           
        * @return              
        */  
       public static String[] stringSpilit(String str,String spilit_sign){   
         String[] spilit_string=str.split(spilit_sign);   
         if(spilit_string[0].equals(""))   
         {   
           String[] new_string=new String[spilit_string.length-1];   
           for(int i=1;i<spilit_string.length;i++)   
             new_string[i-1]=spilit_string[i];   
             return new_string;   
         }   
         else  
           return spilit_string;   
       }   
  
       /**  
        *           
        * @param str          
        * @return          
        */  
       public static String stringTransCharset(String str){   
         String new_str=null;   
         try{   
             new_str=new String(str.getBytes("iso-8859-1"),"GBK");   
         }   
         catch(Exception e){   
           e.printStackTrace();   
         }   
         return new_str;   
       }   
  
       /**  
        *           
        * @param args          
        */  
       public static void main(String[] args){   
  
         //          
         String t_str1="<h1>StringDispose      
\r\'\"</h1>";   
         System.out.println("   ："+t_str1);   
         System.out.println("   ："+StringUtils.stringFilter(t_str1));   
         //          
         String[] t_str_arr1={"PG_1","PG_2","PG_3"};   
         String t_str2=StringUtils.stringConnect(t_str_arr1,",");   
         System.out.println(t_str2);   
         //          
         String[] t_str_arr2=StringUtils.stringSpilit(t_str2,",");   
         for(int i=0;i<t_str_arr2.length;i++){   
           System.out.println(t_str_arr2[i]);   
         }   
       }   
}