【java Itext Pdf】itext pdf隔行换色 itext5添加表格背景颜色
Itext5 pdf 行变色效果图：
新需求，隔行换色，itext in action 是个很好的说明书，照着英文读下来，很简单的进行了实现，思路如下：
1.先创建PdfPTable对象，生成PDF表格cell之后，添加隔行换色的事件，将此事件在PdfPTable加入Document对象之前，插入进去
2.隔行换色的事件需要自己写一个java类，里面去定义背景颜色和长宽高，实质就是在pdf表格生成之后，去读取当页page内的所有行和列，并创建一个矩形，加入背景，覆盖到cell内，达到背景有颜色的效果。
隔行换色的java类：要实现PdfPTableEvent这个接口，否则就没有然后了。
AlternatingBackground.java
/** * Project Name:report * File Name:AlternatingBackground.java * Package Name:com.riambsoft.report.util * Date:2013-5-27上午11:08:30 * Copyright (c) 2013, riambsoft All Rights Reserved. * */ package com.itext.me; import java.awt.Color; import java.lang.management.ManagementFactory; import javax.management.InstanceAlreadyExistsException; import javax.management.MBeanRegistrationException; import javax.management.MBeanServer; import javax.management.MalformedObjectNameException; import javax.management.NotCompliantMBeanException; import javax.management.ObjectName; import com.itextpdf.text.BaseColor; import com.itextpdf.text.Rectangle; import com.itextpdf.text.pdf.PdfContentByte; import com.itextpdf.text.pdf.PdfPTable; import com.itextpdf.text.pdf.PdfPTableEvent; /** * ClassName:AlternatingBackground <br/> Function: TODO ADD FUNCTION. <br/> Reason: TODO ADD REASON. <br/> Date: 2013-5-27 上午11:08:30 <br/> * * @author Administrator * @version * @since JDK 1.5 * @see */ public class AlternatingBackground implements PdfPTableEvent { public void tableLayout(PdfPTable table, float[][] widths, float[] heights, int headerRows, int rowStart, PdfContentByte[] canvases) { int columns; Rectangle rect; //合适的颜色：（235，235，235） int footer = widths.length - table.getFooterRows(); int header = table.getHeaderRows() - table.getFooterRows() + 1; for (int row = header; row < footer; row += 2) { columns = widths[row].length - 1; rect = new Rectangle(widths[row][0], heights[row], widths[row][columns], heights[row + 1]); rect.setBackgroundColor(new BaseColor(235,235,235)); rect.setBorder(Rectangle.NO_BORDER); canvases[PdfPTable.BASECANVAS].rectangle(rect); } } }
然后再在你的pdf生成类里面，去new 一个这个事件，加到pdftable中即可。LOOK
/** * Project Name:TestItext * File Name:TestPdf.java * Package Name:com.itext.me * Date:2013-5-28下午03:38:17 * Copyright (c) 2013, riambsoft All Rights Reserved. * */ package com.itext.me; import java.io.FileOutputStream; import java.io.IOException; import java.util.Random; import com.itextpdf.text.Document; import com.itextpdf.text.DocumentException; import com.itextpdf.text.Element; import com.itextpdf.text.Font; import com.itextpdf.text.Phrase; import com.itextpdf.text.pdf.BaseFont; import com.itextpdf.text.pdf.PdfPCell; import com.itextpdf.text.pdf.PdfPTable; import com.itextpdf.text.pdf.PdfPTableEvent; import com.itextpdf.text.pdf.PdfWriter; /** * ClassName:TestPdf <br/> Function: TODO ADD FUNCTION. <br/> Reason: TODO ADD REASON. <br/> Date: 2013-5-28 下午03:38:17 <br/> * * @author Administrator * @version * @since JDK 1.5 * @see */ public class TestPdf { /** * main:(这里用一句话描述这个方法的作用). <br/> * * @param args * @throws IOException * @throws DocumentException * @since JDK 1.5 */ public static void main(String[] args) throws IOException, DocumentException { String fileDesc = ""; FileOutputStream outr = null;// 创建输出流 // 生成随机数 Random random = new Random(); int x = random.nextInt(); fileDesc = "c:\\pdftest\\" + "_" + x + ".pdf";// 路径下一定要有此文件 BaseFont baseFontChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED); Font fontChinese = new Font(baseFontChinese, 12, Font.NORMAL); // step 1 Document document = new Document(); // step 2 try { outr = new FileOutputStream(fileDesc); PdfWriter.getInstance(document, outr); // step 3 document.open(); // step 4 PdfPTable table = new PdfPTable(3); // the cell object PdfPCell cell; // we add a cell with colspan3 cell = new PdfPCell(new Phrase("Cell with colspan 3")); cell.setColspan(3); table.addCell(cell); // now we add a cell with rowspan2 cell = new PdfPCell(new Phrase("Cell with rowspan 2 跨行", fontChinese)); cell.setRowspan(2); // cell.setHorizontalAlignment(Element.ALIGN_MIDDLE); cell.setVerticalAlignment(Element.ALIGN_MIDDLE); table.addCell(cell); // we add the four remaining cells with addCell() table.addCell("row 1-1; cell 1"); table.addCell("row 1-2; cell 2"); cell = new PdfPCell(new Phrase("Cell with rowspan 2 跨行", fontChinese)); table.addCell("row 2-1; cell 1"); table.addCell("row 2-2; cell 2"); table.addCell("row 3-1; cell 1"); table.addCell("row 3-2; cell 2"); table.addCell("row 3-3; cell 3"); table.addCell("row 4-1; cell 1"); table.addCell("row 4-2; cell 2"); table.addCell("row 4-3; cell 3"); table.addCell("row 5-1; cell 1"); table.addCell("row 5-2; cell 2"); table.addCell("row 5-3; cell 3"); table.addCell("row 6-1; cell 1"); table.addCell("row 6-2; cell 2"); table.addCell("row 6-3; cell 3"); table.addCell("row 7-1; cell 1"); table.addCell("row 7-2; cell 2"); table.addCell("row 7-3; cell 3"); table.addCell("row 8-1; cell 1"); table.addCell("row 8-2; cell 2"); table.addCell("row 8-3; cell 3"); table.addCell("row 9-1; cell 1"); table.addCell("row 9-2; cell 2"); table.addCell("row 9-3; cell 3"); //加入隔行换色事件 PdfPTableEvent event = new AlternatingBackground(); table.setTableEvent(event); //end document.add(table); document.close(); } catch (DocumentException e1) { e1.printStackTrace(); } finally { if (outr != null) { outr.close(); } String cmd = "\"C:\\Program Files\\Foxit Software\\Foxit Reader\\Foxit Reader.exe\" ";// 这个是命令行打开福昕阅读器，我的福昕安装路径，你可以仿造我的写一个。 System.out.println(cmd + "\"" + fileDesc + "\"" + " -n"); Runtime.getRuntime().exec(cmd + "\"" + fileDesc + "\"" + " -n"); // 打开pdf } } }
结果图：
所有源码+jar包+doc文档 下载：http://download.csdn.net/detail/ae6623/5471531
落雨 csdn 本文：http://blog.csdn.net/ae6623/article/details/8987645
落雨
2013年5月29日9:19:03
qq 394263788
