给大家一个操作String的javabean，哈哈~~爽呆辣！-JSP教程,资料/其它

/*
*author:tyfun
*datetime:2002.12.19
*package:com.westarsoft.function
*/

package com.westarsoft.function;

public class htmlfilter {
    /*use:
     *string escapehtmltags( string input , boolean htmlflag )
     */
    public static string escapehtmltags( string input , boolean htmlflag ) {
        if( input == null || input.length() == 0 || htmlflag ) {
          return input;
        }
        stringbuffer buf = new stringbuffer(input.length()+6);
        char ch = ;     
        for( int i=0; i<input.length(); i++ ) {
            ch = input.charat(i);
            if( ch == < ) {
                buf.append( "<" );
            }
            else if( ch == > ) {
                buf.append( ">" );
            }
            else {
             buf.append( ch );
            }
        }
        return buf.tostring();
    }
    /*use:
     *string replace( string line, string oldstring, string newstring )
     */
    public static string replace( string line, string oldstring, string newstring ) {
        int i=0;        
        if ( ( line == null || oldstring == null ) ) {
            return null;
        }        
        if ( ( i=line.indexof( oldstring, i ) ) >= 0 ) {
            int olength = oldstring.length();
            int nlength = newstring.length();
            stringbuffer buf = new stringbuffer();
            buf.append(line.substring(0,i)).append(newstring);
            i += olength;
            int j = i;            
            while( (i=line.indexof(oldstring,i)) > 0 ) {
                buf.append(line.substring(j,i)).append(newstring);
                i += olength;
                j = i;
            }
            buf.append(line.substring(j));
            return buf.tostring();
        }
        return line;
    }
    /*use:
     *string replaceignorecase( string line, string oldstring, string newstring )
     */
    public static string replaceignorecase( string line, string oldstring, string newstring ) {
        if (line == null) {
            return null;
        }
        string lcline = line.tolowercase();
        string lcoldstring = oldstring.tolowercase();
        int i=0;        
        if ( ( i=lcline.indexof( lcoldstring, i ) ) >= 0 ) {
            char [] line2 = line.tochararray();
            char [] newstring2 = newstring.tochararray();
            int olength = oldstring.length();
            stringbuffer buf = new stringbuffer(line2.length);
            buf.append(line2, 0, i).append(newstring2);
            i += olength;
            int j = i;            
            while( ( i=lcline.indexof( lcoldstring, i ) ) > 0 ) {
                buf.append(line2, j, i-j).append(newstring2);
                i += olength;
                j = i;
            }
            buf.append(line2, j, line2.length – j);
            return buf.tostring();
        }
        return line;
    }
    /*use:
     *string convertubb( string input )
     */
    public static string convertubb ( string input ) {
        if( input == null || input.length() == 0 ) {
            return input;
        }
        else {
            input = replaceignorecase( input , "<" ,"<" ) ;
            input = replaceignorecase( input , "<%" ,"<%" ) ;
            input = replaceignorecase( input , "%>" ,"%>" ) ;
            input = replaceignorecase( input , ">" ,">" ) ;
            input = replaceignorecase( input , "" ,"<b>" ) ;
               input = replaceignorecase( input , "" ,"</b>" ) ;
             input = replaceignorecase( input , "" ,"<i>" ) ;
             input = replaceignorecase( input , "" ,"</i>" ) ;
             input = replaceignorecase( input , "" ,"<u>" ) ;
             input = replaceignorecase( input , "" ,"</u>" ) ;
            input = replaceignorecase( input , "[red]" ,"<font color=red>" ) ;
            input = replaceignorecase( input , "[/red]" ,"</font>" ) ;
            input = replaceignorecase( input , "

" ,"<ul>" ) ;
             input = replaceignorecase( input , "

" ,"</ul>" ) ;
            input = replaceignorecase( input , "

" ,"</li>" ) ;
            input = replaceignorecase ( input , "

" , "<blockquote><hr><b>" ) ;
            input = replaceignorecase ( input , "

" , "</b><hr></blockquote>" ) ;
            input = replace ( input , "  " ,"  " ) ;
            input = replace ( input , "\n" ,"<br>" ) ;
            if ( input.indexof("<") >= 0 ) {
                  int oldpre = input.indexof( "<" , 0 ) ;
                 int oldend = input.indexof( ">" , oldpre ) ;
                 int tempint = 0 ;
                 stringbuffer setblank = new stringbuffer () ;            
                 while (  oldpre >= 0 && oldend > 0 ) {
                        setblank = setblank.append( input.substring( tempint , oldpre) ) ;
                    setblank = setblank.append ( replace ( input.substring( oldpre ,oldend ) , " " , " " ) ) ;
                    tempint = oldend ;
                    oldpre = input.indexof( "<" , oldend ) ;
                    oldend = input.indexof( ">" , oldpre ) ;
                }
                 setblank = setblank.append ( input.substring( tempint ) ) ;
                 input = setblank.tostring() ;
            }
        }
        return input;
    }
    /*use:
     *string converturl( string input , boolean urlflag )
     */
    public static string converturl( string input , boolean urlflag ) {
        if( input == null || input.length() == 0 || urlflag || input.indexof("[url") != -1 ) {
            return input;
        }
        else {
            stringbuffer buf = new stringbuffer();
            int i = 0, j = 0, oldend = 0;
            int len = input.length();
            char cur;
            while ( ( i=input.indexof( "http://", oldend) ) >= 0 ) {
                j=i+7;
                cur = input.charat(j);
                while (j < len) {
                     if (cur == ) break;
                     if (cur == <) break;
                    if (cur == \n) break;
                       if (cur == \r && j<len-1 && input.charat(j+1) == \n) break;
                           j++;
                     if (j<len) {
                        cur = input.charat(j);
                       }
                }
                buf.append(input.substring(oldend,i));
                buf.append("]                 buf.append(input.substring(i,j));
                buf.append("” target=_blank>");
                buf.append(input.substring(i,j));
                buf.append("");
                oldend = j;
            }
            buf.append(input.substring(j,len));
            return buf.tostring();
        }
    }
    //
    public static string convertspecialtage (
           string input ,
        string tagnamepre ,
          string tagnameend ,
          string tagcontentpre ,
          string tagcontentend ,
          string tagattach ) {
          if( input == null || input.length() == 0 || input.indexof( tagnamepre ) < 0 ) {
            return input;
        }
          else {
              try {
                 stringbuffer buf = new stringbuffer();
                int i = 0, j = 0, oldend = 0;
                int len = input.length();
                int tagprelength = tagnamepre.length() ;
                int tagendlength = tagnameend.length() ;
                boolean errorflag = false ;
                char cur;
                while ( ( i=input.indexof( tagnamepre , oldend) ) >= 0 ) {
                    j = i + tagprelength ;
                       j = input.indexof( tagnameend , j ) ;
                       if ( j < 0 ) {
                           buf.append ( input.substring( oldend , len ) ) ;
                          errorflag = true ;
                          break;
                    }
                    else {
                           buf.append( input.substring(oldend,i));
                          buf.append( tagcontentpre );
                          buf.append( input.substring(i + tagprelength ,j));
                          buf.append( tagcontentend );
                          buf.append( input.substring(i + tagprelength ,j)).append( tagattach ) ;
                    }
                       oldend = j + tagendlength ;
                }
                   if ( !errorflag ) {
                    buf.append(input.substring(j + tagendlength,len));
                }
                return buf.tostring();
            }
             catch ( indexoutofboundsexception iobe ) {
                 return input;
            }
             catch ( exception e ) {
                 return input;
            }
        }
    }
    //
    public static string convertspecialtage (
           string input ,
          string tagnamepre ,
          string tagnameend ,
          string tagcontentpre ,
          string tagcontentend  ) {
          if( input == null || input.length() == 0 || input.indexof( tagnamepre ) < 0 ) {
            return input;
        }
          else {
              try {
            stringbuffer buf = new stringbuffer();
            int i = 0, j = 0, oldend = 0;
            int len = input.length();
            int tagprelength = tagnamepre.length() ;
            int tagendlength = tagnameend.length() ;
            boolean errorflag = false ;
            char cur;
            while ( ( i=input.indexof( tagnamepre , oldend) ) >= 0 ) {
                j = i + tagprelength ;
                j = input.indexof( tagnameend , j ) ;
                if ( j < 0 ) {
                    buf.append ( input.substring( oldend , len ) ) ;
                    errorflag = true ;
                    break;
                }
                else {
                    buf.append( input.substring(oldend,i));
                    buf.append( tagcontentpre );
                      buf.append( input.substring(i + tagprelength ,j));
                      buf.append( tagcontentend );
                }
                oldend = j + tagendlength ;
            }
            if ( !errorflag ) {
                buf.append( input.substring(j + tagendlength,len));
            }
            return buf.tostring();
            }
             catch ( indexoutofboundsexception iobe ) {
                 return input;
            }
            catch ( exception e ) {
                 return input;
            }
        }
    }
    //
    public static string convertspecialtage (
           string input ,
        string tagnamepre ,
        string tagnameend ,
        string tagcontentpre ,
        string tagcontentend ,
        string tagattach ,
        string interval ) {
        if( input == null || input.length() == 0 || input.indexof( tagnamepre ) < 0 ) {
               return input;
        }
        else {
            try {
                   stringbuffer buf = new stringbuffer();
                int i = 0, j = 0, oldend = 0;
                int len = input.length();
                int tagprelength = tagnamepre.length() ;
                int tagendlength = tagnameend.length() ;
                int intervallength = interval.length() ;
                boolean errorflag = false ;
                string tempstring = null ;
                char cur;
                while ( ( i=input.indexof( tagnamepre , oldend) ) >= 0 ) {
                    j = i + tagprelength ;
                    j = input.indexof( tagnameend , j ) ;
                    if ( j < 0 ) {
                        buf.append ( input.substring( oldend , len ) ) ;
                          errorflag = true ;
                          break;
                    }
                    else {
                        int intervalpostion = input.indexof( interval , i + tagprelength ) ;
                         if ( intervalpostion + intervallength >= j ) {
                              buf.append ( input.substring( oldend , len ) ) ;
                            errorflag = true ;
                            break;
                        }
                        buf.append( input.substring(oldend,i));
                        buf.append( tagcontentpre );
                        tempstring = input.substring(i + tagprelength ,intervalpostion ).trim() ;
                        if ( tempstring.indexof("\"") == 0 ) {
                               tempstring = tempstring.substring ( 1 , tempstring.indexof( "\"" , 1 ) ) ;
                        }
                           buf.append( tempstring );
                        buf.append( tagcontentend );
                        buf.append( input.substring( intervalpostion + intervallength ,j ) ).append( tagattach ) ;
                    }
                    oldend = j + tagendlength ;
                }
                if ( !errorflag ) {
                     buf.append(input.substring(j + tagendlength,len));
                }
                return buf.tostring();
            }
            catch ( indexoutofboundsexception iobe ) {
                   return input;
            }
            catch ( exception e ) {
                      return input;
            }
        }
    }
    /*use:
     *string convertimg( string input )
     */
    public static string convertimg ( string input ) {
        if( input == null || input.length() == 0 ) {
               return input;
        }
          else {
              return convertspecialtage ( input , "" , "<img src=\"" , "\">" ) ;
        }
    }
    /*use:
     *string convertsupperubb( string input , int level )
     */
    public static string convertsupperubb ( string input , int level ) {
        if( input == null || input.length() == 0 ) {
                  return input;
          }
          else {
              level++ ;
             if ( level– > 0 ) input = convertspecialtage ( input , "" , "" , "<a target=\"_blank\" href=\"" , "\">" , "</a>" ) ;
             if ( level– > 0 ) input = convertspecialtage ( input , "[url=" , "][/url]" , "<a target=\"_blank\" href=\"" , "\">" , "</a>" , "]" ) ;
             if ( level– > 0 ) input = convertspecialtage ( input , "[color=" ,"][/color]" , "<font color=\"" , "\">" , "</font>" , "]" ) ;
             if ( level– > 0 ) input = convertspecialtage ( input , "[size=" ,"][/size]" , "<font size=\"" , "\">" , "</font>" , "]" ) ;
             if ( level– > 0 ) input = convertspecialtage ( input , "" , "" , "<a href=\"mailto:" , "\">" , "</a>" ) ;
             if ( level– > 0 ) input = convertspecialtage ( input , "" , "<img src=\"" , "\">" ) ;
             if ( level– > 0 ) input = convertspecialtage ( input , "[swf]" , "[/swf]" ,
                                                    "<object classid=\"clsid:d27cdb6e-ae6d-11cf-96b8-444553540000\" codebase=\"http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=4,0,2,0\"><param name=movie value=\"" ,
                                                     "\"><param name=quality value=high><embed src=\"" ,
                                                     "\" quality=high pluginspage=\"http://www.macromedia.com/shockwave/download/index.cgi?p1_prod_version=shockwaveflash\" type=\"application/x-shockwave-flash\"></embed></object>"
                                                                         ) ;
             if ( level– > 0 ) input = convertspecialtage ( input , "[url2]" , "[/url2]" , "<a " + "href=\"" , "\">" , "</a>" ) ;
             if ( level– > 0 ) input = convertspecialtage ( input , "[url2=" , "][/url2]" , "<a " + "href=\"" , "\">" , "</a>" , "]" ) ;
             if ( level– > 0 ) input = convertspecialtage ( input , "[a]" ,"[/a]" , "<a name=\"" , "\"></a>" ) ;
             if ( level– > 0 ) input = convertspecialtage ( input , "[div=" ,"][/div]" , "<div align=\"" , "\">" , "</div>" , "]" ) ;
             if ( level– > 0 ) input = convertspecialtage ( input , "[jsurl=" ,"][/jsurl]" , "<a href=\"#\" onclick=\"" ,"\">" ,"</a>" ,"]") ;
             if ( level– > 0 ) input = convertspecialtage ( input , "[class=" ,"][/class]" , "<span class=\"" , "\">" , "</span>" , "]" ) ;         
             input = convertubb ( input ) ;
             return input ;
        }
    }
    /*use:
     *string convertmail( string input )
     */
    public static string convertmail ( string input ) {
        if( input == null || input.length() == 0 ) {
              return input;
        }
          else {
              return convertspecialtage ( input , "" , "" , "<a href=\"mailto:" , "\">" , "</a>" ) ;
        }
    }
    /*use:
     *string convertswf( string input )
     */
    public static string convertswf ( string input ) {
        if( input == null || input.length() == 0 ) {
               return input;
        }
          else {
            return convertspecialtage ( input , "[swf]" , "[/swf]" ,
         "<object classid=\"clsid:d27cdb6e-ae6d-11cf-96b8-444553540000\" codebase=\"http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=4,0,2,0\"><param name=movie value=\"" ,
         "\"><param name=quality value=high><embed src=\"" ,
         "\" quality=high pluginspage=\"http://www.macromedia.com/shockwave/download/index.cgi?p1_prod_version=shockwaveflash\" type=\"application/x-shockwave-flash\"></embed></object>"
         ) ;
        }
    }
}