生成PDF，中文失踪问题

使用itext生成pdf，在linux环境下，中文全部失踪，因为itext要在linux下支持中文字体需要引入itext-asian，并添加一个字体类。

字体类

import com.itextpdf.text.Font;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.tool.xml.XMLWorkerFontProvider;

public class PdfFont extends XMLWorkerFontProvider{
    public PdfFont(){
        super(null,null);
    }
    @Override
    public Font getFont(final String fontname, String encoding, float size, final int style) {
                                                                                           
        Font FontChinese = null;
        try {
            BaseFont bfChinese = BaseFont.createFont("STSong-Light",
                    "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
            FontChinese = new Font(bfChinese, 12, Font.NORMAL);
        } catch (Exception e) {
            e.printStackTrace();
        }
        if(FontChinese==null)
            FontChinese = super.getFont(fontname, encoding, size, style);
        return FontChinese;
    }
}

生成pdf

Document document = new Document(PageSize.A4, 50, 50, 50, 50);
            PdfWriter writer = PdfWriter.getInstance(document, bos);
            document.open();

            String is = VelocityUtil
                    .getVResult(htmlfile.getAbsolutePath(), map);
            InputStream streamTemp = new ByteArrayInputStream(is.getBytes());
            XMLWorkerHelper.getInstance().parseXHtml(writer, document,
                    streamTemp, null,Charset.forName("UTF-8"),new PdfFont());