ITEXT 表与表格标题不分开，图与图片标题不分开

问题场景

在用ITEXT写PDF的过程中遇到表与表格标题不分开，图与图片标题不分开的需求。

分析

通常报表中的表格和图片的标题会遵循表上图下，为了方便读者阅读一般要求表格与表格标题不分开，图片也是。通过查询API发现ITEXT提供了table.setKeepTogether(true)的方法，由此可以解决上述问题。

解决思路

以表格为例：
1. 建立一个总的table，a
2. 设置属性
3. 为表格标题建立一个table，b
4. 为表格内容建立一个table，c
5. 把b,c这两个table作为单元格嵌套到table a

图片情况：
图片当成b，把图片标题当成c即可。

效果

CODE

需要导入的包：itext-pdfa-5.5.6.jar、itext-xtra-5.5.6.jar、itext-5.5.6.jar、itext-asian.jar

package itext;import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;import java.io.FileNotFoundException;
import java.io.FileOutputStream;/*** Created on 2017/5/16* Author: youxingyang.*/
public class TableAndTitle {
    /*** @param args*/public static void main(String[] args) throws Exception {String fileName = "tableAndTitle.pdf";TableAndTitle.test(fileName);}private static void test(String fileName) {Document document = new Document();try {PdfWriter.getInstance(document, new FileOutputStream(fileName));document.open();//加一些测试内容for (int i = 0; i < 35; i++) {document.add(new Paragraph("content" + (i + 1)));}PdfPTable table = new PdfPTable(1);table.setKeepTogether(true);table.setSplitLate(false);PdfPTable table1 = new PdfPTable(1);PdfPCell cell0 = new PdfPCell();Paragraph p = new Paragraph("table title sample");p.setAlignment(1);p.setSpacingBefore(15f);cell0.setHorizontalAlignment(PdfPCell.ALIGN_CENTER);cell0.setVerticalAlignment(PdfPCell.ALIGN_MIDDLE);//然并卵cell0.setPaddingTop(-2f);//把字垂直居中cell0.setPaddingBottom(8f);//把字垂直居中cell0.addElement(p);cell0.setBorder(0);table1.addCell(cell0);PdfPTable table2 = new PdfPTable(2);for (int a = 0; a < 20; a++) {PdfPCell cell = new PdfPCell();Paragraph pp;if (a == 0 || a == 1) {pp = str2ParaByTwoFont("tableTitle" + (a + 1), 9f, BaseColor.BLACK, Font.BOLD); //小五 加粗cell.setBackgroundColor(new BaseColor(128, 128, 255));} else {pp = str2ParaByTwoFont("tableContent" + (a - 1), 9f, BaseColor.BLACK); //小五}pp.setAlignment(1);cell.setHorizontalAlignment(PdfPCell.ALIGN_CENTER);cell.setVerticalAlignment(PdfPCell.ALIGN_MIDDLE);//然并卵cell.setPaddingTop(-2f);//把字垂直居中cell.setPaddingBottom(8f);//把字垂直居中cell.addElement(pp);table2.addCell(cell);}PdfPCell c1 = new PdfPCell();c1.setBorder(0);c1.addElement(table1);PdfPCell c2 = new PdfPCell();c2.setBorder(0);c2.addElement(table2);table.addCell(c1);table.addCell(c2);document.add(table);document.close();} catch (DocumentException | FileNotFoundException e) {e.printStackTrace();}}/*** 两种字体显示文字* @param cont* @param size* @param color* @return*/private static Paragraph str2ParaByTwoFont(String cont, float size, BaseColor color) {Paragraph res = new Paragraph();FontSelector selector = new FontSelector();//非汉字字体颜色Font f1 = FontFactory.getFont(FontFactory.TIMES_ROMAN, size);f1.setColor(color);//汉字字体颜色Font f2 = FontFactory.getFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED, size);f2.setColor(color);selector.addFont(f1);selector.addFont(f2);Phrase ph = selector.process(cont);res.add(ph);return res;}/*** 两种字体显示文字* @param cont* @param size* @param color* @param bold* @return*/private static Paragraph str2ParaByTwoFont(String cont, float size, BaseColor color, int bold) {Paragraph res = new Paragraph();FontSelector selector = new FontSelector();//非汉字字体颜色Font f1 = FontFactory.getFont(FontFactory.TIMES_ROMAN, size);f1.setColor(color);f1.setStyle(bold);//汉字字体颜色Font f2 = FontFactory.getFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED, size);f2.setColor(color);f2.setStyle(bold);selector.addFont(f1);selector.addFont(f2);Phrase ph = selector.process(cont);res.add(ph);return res;}
}