请看下面这个例子
public static String escapeHTMLTags( String input ) {
// Check if the string is null or zero length -- if so, return what was sent in.
if( input == null || input.length() == 0 ) {
return input;
}
// Use a StringBuffer in lieu of String concatenation -- it is much more efficient this way.
StringBuffer buf = new StringBuffer();
char ch = ´ ´;
for( int i=0; i<input.length(); i++ ) {
ch = input.charAt(i);
if( ch == &acute;<&acute; ) {
buf.append( "<" );
}
else if( ch == &acute;>&acute; ) {
buf.append( ">" );
}
else {
buf.append( ch );
}
}
return buf.toString();
}