ITEXT-小图片并排显示，大图片按行显示

本文主要是介绍ITEXT-小图片并排显示，大图片按行显示，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

问题场景

使用itext开发PDF过程中，有这样一个需求：有N个图片，每个图片大小不一，要求小图片每2个并排显示，大图片逐一按行显示。那么问题来了，图片多小算小？由API知image01.getWidth()与image01.getWeight()可以判断图片大小。

代码

需导入的jar包：itext-pdfa-5.5.6.jar、itext-xtra-5.5.6.jar、itext-5.5.6.jar、itext-asian.jar

/*** 添加图片（有并排需求）  图片高度必须一致* 思路：* 1.   通过图片的宽度是否小于pos值决定是否并排显示，是-> half; 否->all* 2.   新建一个2列的PdfTable* 3.   根据得到的half与all集合判断显示图片* @param imagesDNA             图片集合* @param size                  样品编号数量* @param reportCompile         信息载体，应用的时候可根据情况忽略* @param document* @param writer* @param baseFont1* @param yahei09* @param imageLocalAddr        本地图片前缀* @param pos                   图片宽度标准* @throws DocumentException* @throws MalformedURLException* @throws IOException*/private void addFulu(List<PdfImage> imagesDNA, int size, ReportCompile reportCompile, Document document, PdfWriter writer, BaseFont baseFont1,Font yahei09, String imageLocalAddr, Float pos) throws DocumentException, MalformedURLException, IOException {String bigTitle = "";String completeCheck = reportCompile.getCompleteCheck();if (completeCheck != null && completeCheck.equals("1") || completeCheck.equals("2")) {bigTitle = "a";} else if (completeCheck != null && completeCheck.equals("3")){bigTitle = "b";} else if (completeCheck != null && completeCheck.equals("4")){bigTitle = "c";}if (imagesDNA == null) {System.out.println("在图片库没有查到值.");PdfPTable table = new PdfPTable(1);PdfPCell cell0 = new PdfPCell();Paragraph p = new Paragraph(bigTitle, yahei09);p.setFirstLineIndent(-14f);p.setSpacingAfter(20f);cell0.addElement(p);String imagePath = imageLocalAddr + "error.png";Image image01 = Image.getInstance(imagePath);image01.scaleAbsoluteWidth(250); image01.scaleAbsoluteHeight(80); cell0.setBorder(0);cell0.setPaddingLeft(100f);cell0.addElement(image01);table.addCell(cell0);table.setSplitLate(false);table.setSplitRows(false);document.add(table);} else {PdfImage[] images = new PdfImage[imagesDNA.size() > size ? size : imagesDNA.size()];images = imagesDNA.toArray(images);List<String> flags = this.getFlagRowOrCol(imagesDNA, pos, imageLocalAddr);PdfPTable table = new PdfPTable(2);int halfFlagNum = 0;for (int i = 0; i < images.length; i++) {if (flags.get(i).equals("half")) {halfFlagNum++;}PdfPCell cell = new PdfPCell();if (i == 0) {Paragraph p = new Paragraph(bigTitle, yahei09);p.setSpacingAfter(14f);cell.addElement(p);}String imagePath = images[i].getImagePath();if (imagePath == null || imagePath == "") {imagePath = imageLocalAddr + "error.png";} else {imagePath = "http://file.xxx.com" + imagePath;}Image image01 = null;try {image01 = Image.getInstance(imagePath);} catch (FileNotFoundException e) {image01 = Image.getInstance(imageLocalAddr + "error.png");}if (flags.get(i).equals("half")) {image01.scalePercent(75);//设置对齐方式if (halfFlagNum % 2 == 1) {image01.setAlignment(Image.RIGHT);cell.setPaddingLeft(-21f);cell.setPaddingRight(15f);} else {cell.setPaddingLeft(35f);}cell.setRowspan(2);} else {if (image01.getWidth() <= pos) {image01.scalePercent(75);} else {image01.scalePercent(45);}image01.setAlignment(Image.MIDDLE);cell.setColspan(2);if (images.length == 1) {cell.setPaddingLeft(-21f);}}cell.addElement(image01);cell.setBorder(0);if (i > 0) {cell.setPaddingTop(32f);}table.addCell(cell);table.setSplitLate(false);table.setSplitRows(false);}document.add(table);}}/*** 获取标志位* 直接通过图片的宽度来判断是否并排显示* @param imagesDNA* @param pos               图片宽度标准，2个小图片放在一行* @param imageLocalAddr        * @return* @throws IOException * @throws MalformedURLException * @throws BadElementException */private List<String> getFlagRowOrCol(List<PdfImage> imagesDNA, Float pos, String imageLocalAddr) throws BadElementException, MalformedURLException, IOException {List<String> res = new ArrayList<String>();List<Float> list = new ArrayList<Float>();if (imagesDNA != null && imagesDNA.size() > 0) {for (int i = 0; i < imagesDNA.size(); i++) {String imagePath = imagesDNA.get(i).getImagePath();if (imagePath == null || imagePath == "") {imagePath = imageLocalAddr + "error.png";} else {imagePath = "http://file.xxx.com" + imagePath;}Image image01 = null;try {image01 = Image.getInstance(imagePath);} catch (FileNotFoundException e) {image01 = Image.getInstance(imageLocalAddr + "error.png");}list.add(image01.getWidth());}}if (list.size() <= imagesDNA.size()) {res = this.judgeRowOrCol(list, pos);}return res;}/*** 此方法用于判断是合并列还是合并行* @param list  判断依据* @param pos   连续两个在一起的且小于等于pos值的标志位为half,否则为all* @return*/private List<String> judgeRowOrCol(List<Float> list, Float pos) {List<String> res = new ArrayList<String>();String half = "half";String all = "all";int couple = 0;if (list != null && list.size() > 0) {for (int i = 0; i < list.size(); i++) {float current = list.get(i);if (i < list.size() - 1) {float next = list.get(i + 1);if (current <= pos) {couple++;if (next <= pos && couple != 2) {res.add(half);} else {if (couple == 2) {res.add(half);couple = 0;} else {res.add(all);}}} else {res.add(all);couple = 0;}} else {float previous = list.size() == 1 ? current : list.get(i - 1);if (previous <= pos && current <= pos) {if (list.size() == 1) {res.add(all);} else {if (couple == 0) {res.add(all);} else {res.add(half);}}} else {res.add(all);}}}}return res;}