给大家一个操作String的javabean，哈哈~~爽呆辣！

答案：/*
 *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 , "<%" ,"<%" ) ;
    &nb

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