可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):
问题:
I am trying to create pdf documents using iText (version 5.4.0) in a java web application and I have come across an issue with fonts.
The web application is multi-lingual, and so users may save information into the system in various languages (eg. english, french, lithuanian, chinese, japanese, arabic, etc.).
When I tried to configure the pdf to output some sample japanese text it didn't show up, so I started following the examples in the official "iText in Action" book. The problem I have encountered is that when I try and configure a font with BaseFont.IDENTITY_H encoding I get the following error:
java.nio.charset.UnsupportedCharsetException: Identity-H at java.nio.charset.Charset.forName(Charset.java:505) at com.itextpdf.text.pdf.PdfEncodings.convertToBytes(PdfEncodings.java:186) at com.itextpdf.text.pdf.Type1Font.<init>(Type1Font.java:276) at com.itextpdf.text.pdf.BaseFont.createFont(BaseFont.java:692) at com.itextpdf.text.pdf.BaseFont.createFont(BaseFont.java:615) at com.itextpdf.text.pdf.BaseFont.createFont(BaseFont.java:450)
Nothing in the book or searching Google mentions this issue.
Any suggestions as to what I might have missed?
回答1:
As you probably understood from the answers from two Michaels, you made the wrong assumption that the standard Type 1 font Times Roman and IDENTITY_H are compatible. You'll have to change the font if you want to use IDENTITY_H, or change the encoding if you want to use a standard Type 1 font (in which case using BaseFont.EMBEDDED doesn't make sense because standard Type 1 fonts are never embedded). I'm sorry if I didn't mention this in my book. I thought it was kind of trivial. One can deduct it from what I wrote about composite fonts.
回答2:
I don't think there's any one encoding that works for all languages, with font embedding. For example, you'd assume that choosing the UTF-8 encoding, with font embedding set to true will embed the font, but it doesn't.
I find myself having to do this, because I don't know the language of the text ahead of time:
try { // Try to embed the font. // This doesn't work for type 1 fonts. return FontFactory.getFont(fontFace, BaseFont.IDENTITY_H, true, fontSize, fontStyle, textColor); } catch (ExceptionConverter e) { return FontFactory.getFont(fontFace, "UTF-8", true, fontSize, fontStyle, textColor); }
(The exception class may be different since I'm using an older version of iText -- 2.1.)
As with a lot of iText stuff, this is poorly documented, and makes the easy stuff unnecessarily hard.
