java.lang.IllegalArgumentException: Illegal group reference

在用新闻模板做jsp新闻页面静态化转换的时候，程序老是出现


java.lang.IllegalArgumentException: Illegal group reference错误

经过网上查找，问题出在文章中含有$符号，replaceall()的源代码是：

while (cursor < replacement.length()) {
             char nextChar = replacement.charAt(cursor);
             if (nextChar == '\\') {
                 cursor++;
                 nextChar = replacement.charAt(cursor);
                 result.append(nextChar);
                 cursor++;
             } else if (nextChar == '$') {
                 // Skip past $
                 cursor++;

                 // The first number is always a group
                 int refNum = (int)replacement.charAt(cursor) - '0';
                 if ((refNum < 0)||(refNum > 9))
                     throw new IllegalArgumentException(
                         "Illegal group reference");
                 cursor++;

可能问题就出在这里面对$符号的处理。那在处理文章内容（假设存储内容的字段为content）的时候加上

content.replaceAll("\\$", "\\\\\\$")就可以将$符号替换写为\\$ ，这样就避免了错误的发生。