1. Introduce related jar packages
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.5.13</version>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itext-asian</artifactId>
<version>5.2.0</version>
</dependency>
<dependency>
<groupId>com.itextpdf.tool</groupId>
<artifactId>xmlworker</artifactId>
<version>5.5.13</version>
</dependency>
Second, use itextpdf to generate pdf files
2.1 Create target document
public String createDocument(String folderName,String fileName,Document document)
throws IOException {
String pdfPath = "/data/pdfFile";
// 如果文件夹不存在 则创建文件夹
File folder = new File(pdfPath);
if (!folder.exists()) {
folder.mkdirs();
}
folder.createNewFile();
String path = folder.getAbsolutePath();
// 存储文件
File file = new File(path, fileName);
FileOutputStream out = null;
try {
out = new FileOutputStream(file);
PdfWriter pdfWriter = PdfWriter.getInstance(document, out);
pdfWriter.setStrictImageSequence(true);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (DocumentException e) {
e.printStackTrace();
}
// 打开文档准备写入内容
document.open();
return pdfPath;
}
2.2 Create chapters in pdf file
public static Chapter createChapter(String title, int chapterNum, int alignment, int numberDepth, Font font) {
Paragraph chapterTitle = new Paragraph(title, font);
chapterTitle.setAlignment(alignment);
Chapter chapter = new Chapter(chapterTitle, chapterNum);
chapter.setNumberDepth(numberDepth);
return chapter;
}
2.3 Create the subsections under the chapters in the pdf file
public static Section createSection(Chapter chapter, String title, Font font, int numberDepth) {
Section section = null;
if (chapter != null) {
Paragraph sectionTitle = new Paragraph(title, font);
sectionTitle.setSpacingBefore(SPACING);
section = chapter.addSection(sectionTitle);
section.setNumberDepth(numberDepth);
}
return section;
}
2.4 Add text content to the subsections in the pdf document
/**
* 添加文本内容到pdf文档中
* text 文本内容
* font 定义内容的字体
*/
public static Phrase createPhrase(String text, Font font) {
Phrase phrase = new Paragraph(text, font);
return phrase;
}
// 定义内容的字体
Font phraseFont = PDFUtil.createChineseFont(9, Font.NORMAL, new BaseColor(0, 0, 0));
String content = "此处一大段文本。。。。。。";
Phrase phraseCentent = PDFUtils.createPhrase(content, phraseFont);
// 将文本内容添加到pdf文档的小节中
section.add(phraseCentent);
2.5 Add image picture to pdf document
Image pic = Image.getInstance(new URL("https://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png");
//设置图片高度、宽度
pic.scaleToFit(pic.getWidth() / 2, pic.getHeight() / 2);
pic.setWidthPercentage(20);
pic.setScaleToFitHeight(true);
pic.setScaleToFitLineWhenOverflow(true);
// 将图片添加pdf文档中的小节中
section.add(pic);
2.6 Add html content to the pdf document
html document parser: WebXMLWorkerHelper
public class WebXMLWorkerHelper {
public static class MyFontsProvider extends XMLWorkerFontProvider {
public MyFontsProvider() {
super(null, null);
}
@Override
public Font getFont(final String fontname, String encoding, float size, final int style) {
try {
BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);//中文字体
return new Font(bfChinese, size, style);
} catch (Exception ex) {
return new Font(Font.FontFamily.UNDEFINED, size, style);
}
}
}
public static ElementList parseToElementList(String html, String css) throws IOException {
// CSS
CSSResolver cssResolver = new StyleAttrCSSResolver();
if (css != null) {
CssFile cssFile = XMLWorkerHelper.getCSS(new ByteArrayInputStream(css.getBytes()));
cssResolver.addCss(cssFile);
}
// HTML
MyFontsProvider fontProvider = new MyFontsProvider();
CssAppliers cssAppliers = new CssAppliersImpl(fontProvider);
HtmlPipelineContext htmlContext = new HtmlPipelineContext(cssAppliers);
htmlContext.setTagFactory(Tags.getHtmlTagProcessorFactory());
htmlContext.autoBookmark(false);
// Pipelines
ElementList elements = new ElementList();
ElementHandlerPipeline end = new ElementHandlerPipeline(elements, null);
HtmlPipeline htmlPipeline = new HtmlPipeline(htmlContext, end);
CssResolverPipeline cssPipeline = new CssResolverPipeline(cssResolver, htmlPipeline);
// XML Worker
XMLWorker worker = new XMLWorker(cssPipeline, true);
XMLParser p = new XMLParser(worker);
html = html.replace("<br>", "<br/>").replace("<hr>", "<hr/>").replace("<img>", "").replace("<param>", "").replace("<link>", "");//不支持单独标签
p.parse(new ByteArrayInputStream(html.getBytes()));
return elements;
}
}
String htmlContent = "<p style="margin-top: 0px; margin-bottom: 15px; padding: 3px 0px; width: 600px; text-align: left; word-break: break-all; line-height: 1.8em; color: rgb(102, 102, 102); font-family: 微软雅黑; font-size: 18px; letter-spacing: 1px; white-space: normal; background-color: rgb(255, 255, 255); text-indent: 2em;">
<strong>海航回应HU7380航班返航】6月9日，海南航空从三亚飞往北京的HU7380航班起飞后，因飞机驾驶舱风挡</strong>玻璃出现裂纹，返航备降三亚凤凰机场。海航方面回应，此次事件未造成人员伤亡，该航班已经于当天20点14分重新起飞飞往北京。
</p><p style="margin-top: 0px; margin-bottom: 15px; padding: 3px 0px; width: 600px; text-align: left; word-break: break-all; line-height: 1.8em; color: rgb(102, 102, 102); font-family: 微软雅黑; font-size: 18px; letter-spacing: 1px; white-space: normal; background-color: rgb(255, 255, 255); text-indent: 2em;">6月9日，海南航空从三亚飞<span style="border: 1px solid rgb(0, 0, 0);">往</span>北京的HU7380航班起飞后，因飞机驾驶舱风挡玻璃出现裂纹，返航备降三亚凤凰机场。海航方面回应，此次事件未造成人员伤亡，该航班已经于当天2<span style="text-indent: 2em;">0点14分重新起飞飞往北京。</span>
</p>
<p>
<br style="text-align: left;"/>
</p>";
ElementList elementList = WebXMLWorkerHelper.parseToElementList(htmlContent, null);
for (Element element : elementList) {
section.add(element);
}