java使用itext创建pdf时，分不同列显示

根据itext官方回复http://developers.itextpdf.com/question/how-format-string-resulting-two-column-display 实施；

 方法声明为：public ByteBuffer outputPDF(File file,String hints,String[] title,List<String[]> contents,int[] widths)

 
            BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
            Font fontChinese_italic = new Font(bfChinese, 13, Font.ITALIC, BaseColor.LIGHT_GRAY);
            Font fontChinese_title = new Font(bfChinese, 14, Font.BOLD, BaseColor.BLACK);
            Font fontChinese_content = new Font(bfChinese, 14, Font.NORMAL, BaseColor.BLACK); 
Paragraph hintT = createParagraphWithTab(fontChinese_title,title);
//            Paragraph hintT = createParagraphWithSpaces(fontChinese_title,title);
//            document.add(hintT);
//
//            int sz = contents.size();
//            for(int j=0;j<sz;j++)
//            {
////                Paragraph hintC = createParagraphWithTab(fontChinese_content,contents.get(j));
//                Paragraph hintC = createParagraphWithSpaces(fontChinese_content, contents.get(j));
//                document.add(hintC);
//            }

            PdfPTable table = new PdfPTable(7);//7为列，列要写，行可以不写
            table.setWidthPercentage(100);
            table.setHorizontalAlignment(Element.ALIGN_LEFT);
            table.setWidths({2,1,1,1,2,1,4});//这7列，每列的相对宽度，本身宽度与总和商是列宽比例，列宽数组大小要与之前构造函数中的列数严格一致
            table.getDefaultCell().setBorder(Rectangle.NO_BORDER);

            for(String tt:title)
            {
                table.addCell(new Phrase(10,tt,fontChinese_title));
            }

            for(String[] ss:contents)
            {
                for(String s:ss)
                {
                   table.addCell(new Phrase(10,s,fontChinese_content));
                }
            }

            document.add(table);



 private Paragraph createParagraphWithTab(Font font, String[] content) {
        Paragraph p = new Paragraph();
        p.setFont(font);
//        p.set
        for(String s:content)
        {
            p.add(s);
            p.add(Chunk.TAB);
        }
        return p;
    }

    private Paragraph createParagraphWithSpaces(Font font, String[] content) {
        Paragraph p = new Paragraph();
        p.setFont(font);
        for(String s:content)
        {
            p.add(String.format("%-10s", s));
        }
        return p;
    }