ITEXT-小图片并排显示，大图片按行显示

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我是靠谱客的博主忐忑唇膏，最近开发中收集的这篇文章主要介绍ITEXT-小图片并排显示，大图片按行显示，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

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;
}