当我尝试将非法字符写入PDF时,我显然会遇到异常.例如
contentStream.showText("some illegal characters");
...
java.lang.IllegalArgumentException: U+000A ('controlLF') is not available in this font Helvetica (generic: ArialMT) encoding: WinAnsiEncoding...
如何找出不支持哪些字符并从字符串中删除它们？