问题场景
用itext写完table表之后，又要求实现三线表。。。
解决方式
通过查阅API知可以设置每个单元格的边线显示属性，可以通过变量控制显示的属性来达到效果。
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();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);float border = 1.5f;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.setBorderWidthBottom(border);cell.setBorderWidthTop(border);} else {if (a == 18 || a == 19) {cell.setBorderWidthTop(0);cell.setBorderWidthBottom(border);} else {cell.setBorderWidthBottom(0);cell.setBorderWidthTop(0);}pp = str2ParaByTwoFont("tableContent" + (a - 1), 9f, BaseColor.BLACK); //小五}//设置间隔的背景色if ((a + 1) % 2 == 0) {if (((a + 1) / 2) % 2 == 1) {cell.setBackgroundColor(new BaseColor(128, 128, 255));} else {cell.setBackgroundColor(new BaseColor(128, 255, 255));}} else {if (((a + 1) / 2) % 2 == 1) {cell.setBackgroundColor(new BaseColor(128, 255, 255));} else {cell.setBackgroundColor(new BaseColor(128, 128, 255));}}pp.setAlignment(1);cell.setBorderWidthLeft(0);cell.setBorderWidthRight(0);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;}
}