代码拉取完成，页面将自动刷新
学习iText core和pd ffhtml的demo代码
PDF文档的分类：
OutputStream fos = new FileOutputStream("dest.pdf");
PdfWriter writer = new PdfWriter(fos);
PdfDocument pdf = new PdfDocument(writer);
Document document = new Document(pdf);
document.add(new Paragraph("Hello World!"));
document.close();
PdfFont font = PdfFontFactory.createFont(FontConstants.TIMES_ROMAN);
document.add(new Paragraph("iText is:").setFont(font));
//解决中文字符无法显示的问题
PdfFont font = PdfFontFactory.createFont("STSong-Light", "UniGB-UCS2-H",true);
document.add(new Paragraph("这是中文").setFont(font));
List list = new List().setSymbolIndent(12).setListSymbol("\u2022");
list.add(new ListItem("good"))
.add(new ListItem("news"));
Image fox = new Image(ImageDataFactory.create("古剑奇谭壁纸.jpg"));
fox.setWidth(45);
Paragraph p = new Paragraph("this is a iamge").add(fox);
document.add(p);
Table table = new Table(new float[]{4, 1, 3}).useAllAvailableWidth();
BufferedReader br = new BufferedReader(new FileReader("data.csv"));
String line = br.readLine();
StringTokenizer tokenizer = new StringTokenizer(line, ";");
while (tokenizer.hasMoreTokens()) {
table.addHeaderCell(
new Cell().add(
new Paragraph(tokenizer.nextToken())));
}
while ((line = br.readLine()) != null) {
StringTokenizer tokenizer = new StringTokenizer(line, ";");
while (tokenizer.hasMoreTokens()) {
table.addCell(
new Cell().add(
new Paragraph(tokenizer.nextToken())));
}
}
br.close();
document.add(table);
OutputStream fos = new FileOutputStream("dest.pdf");
PdfWriter writer = new PdfWriter(fos);
PdfDocument pdf = new PdfDocument(writer);
PageSize ps = PageSize.A4.rotate();
PdfPage page = pdf.addNewPage(ps);
PdfCanvas canvas = new PdfCanvas(page);
// Draw the line,wait you add
pdf.close();
//变换坐标轴的中心，使之定位于旋转过后的A4纸的中心
canvas.concatMatrix(1, 0, 0, 1, ps.getWidth() / 2, ps.getHeight() / 2);
//设置画笔的颜色
Color blueColor = new DeviceCmyk(1.f, 0.156f, 0.f, 0.118f);
canvas.setLineWidth(0.5f).setStrokeColor(blueColor);
//设置画布的背景色
canvas.rectangle(0, 0, ps.getWidth(), ps.getHeight())
.setColor(ColorConstants.BLACK, true)
.fill();
//画线操作
canvas.moveTo(-(ps.getWidth() / 2 - 15), 0)
.lineTo(ps.getWidth() / 2 - 15, 0)
.stroke();
//画虚线--在画线基础上间隔多少距离截断一下
canvas.setLineWidth(2)
.setStrokeColor(greenColor)
.setLineDash(10, 10, 8)
.moveTo(-(ps.getWidth() / 2 - 15), -(ps.getHeight() / 2 - 15))
.lineTo(ps.getWidth() / 2 - 15, ps.getHeight() / 2 - 15)
.stroke();
//添加一行文字
canvas.newlineShowText("hello");
OutputStream fos = new FileOutputStream("render.pdf");
PdfWriter writer = new PdfWriter(fos);
PdfDocument pdf = new PdfDocument(writer);
PageSize ps = PageSize.A5;
Document document = new Document(pdf, ps);
float offSet = 36;
float columnWidth = (ps.getWidth() - offSet * 2 + 10) / 3;
float columnHeight = ps.getHeight() - offSet * 2;
//设置列的区域
Rectangle[] columns = {
new Rectangle(offSet - 5, offSet, columnWidth, columnHeight),
new Rectangle(offSet + columnWidth, offSet, columnWidth, columnHeight),
new Rectangle(offSet + columnWidth * 2 + 5, offSet, columnWidth, columnHeight)
};
document.setRenderer(new ColumnDocumentRenderer(document, columns));
document.add(...)
//在上文渲染表格cell时候添加块渲染器
Cell cell = new Cell().add(new Paragraph(tokenizer.nextToken()));
cell.setNextRenderer(new RoundedCornersCellRenderer(cell));
//继承块渲染器类
public class RoundedCornersCellRenderer extends CellRenderer {
public RoundedCornersCellRenderer(Cell modelElement) {
super(modelElement);
}
@Override
public void drawBorder(DrawContext drawContext) {
PdfCanvas canvas = drawContext.getCanvas();
//画布上的各种操作
......
super.drawBorder(drawContext);
}
}
PdfDocument pdf = new PdfDocument(writer);
pdf.addEventHandler(PdfDocumentEvent.END_PAGE, new MyEventHandler());
Document document = new Document(pdf);
//实现事件句柄接口
public class MyEventHandler implements IEventHandler {
@Override
public void handleEvent(Event event) {
PdfDocumentEvent docEvent = (PdfDocumentEvent) event;
PdfDocument pdfDoc = docEvent.getDocument();
PdfPage page = docEvent.getPage();
int pageNumber = pdfDoc.getPageNumber(page);
Rectangle pageSize = page.getPageSize();
PdfCanvas pdfCanvas = new PdfCanvas(page.newContentStreamBefore(), page.getResources(), pdfDoc);
// 添加页眉页脚
try {
pdfCanvas.beginText()
.setFontAndSize(PdfFontFactory.createFont(StandardFonts.HELVETICA), 9)
.moveText(pageSize.getWidth() / 2 - 60, pageSize.getTop() - 20)
.showText("this is truth")
.moveText(60, -pageSize.getTop() + 30)
.showText(String.valueOf(pageNumber))
.endText();
} catch (IOException e) {
e.printStackTrace();
}
// 添加水印--重新生成一个画布，然后在指定位置添加文字
Canvas canvas = new Canvas(pdfCanvas, pdfDoc, page.getPageSize());
canvas.showTextAligned(new Paragraph("CONFIDENTIAL"), 298, 421, pdfDoc.getPageNumber(page),
TextAlignment.CENTER, VerticalAlignment.MIDDLE, 45);
pdfCanvas.release();
}
}
PdfAnnotation ann = new PdfTextAnnotation(new Rectangle(120, 800, 0, 0))
.setColor(ColorConstants.GREEN)
.setTitle(new PdfString("iText"))
.setContents("this is a text annotation");
pdf.getFirstPage().addAnnotation(ann);
//创建交互式表单
PdfAcroForm form = PdfAcroForm.getAcroForm(document.getPdfDocument(), true);
//文本域
PdfTextFormField nameField = PdfTextFormField.createText(document.getPdfDocument(),
new Rectangle(99, 753, 425, 15), "name", "");
form.addField(nameField);
//单选按钮
PdfButtonFormField group = PdfFormField.createRadioGroup(document.getPdfDocument(), "language", "");
PdfFormField.createRadioButton(document.getPdfDocument(), new Rectangle(130, 728, 15, 15), group, "English");
PdfFormField.createRadioButton(document.getPdfDocument(), new Rectangle(200, 728, 15, 15), group, "French");
form.addField(group);
//复选按钮
for (int i = 0; i < 3; i++) {
PdfButtonFormField checkField = PdfFormField.createCheckBox(document.getPdfDocument(), new Rectangle(119 + i * 69, 701, 15, 15),
"experience".concat(String.valueOf(i + 1)), "Off", PdfFormField.TYPE_CHECK);
form.addField(checkField);
}
//下拉框
String[] options = {"Any", "6.30 am - 2.30 pm", "1.30 pm - 9.30 pm"};
PdfChoiceFormField choiceField = PdfFormField.createComboBox(document.getPdfDocument(), new Rectangle(163, 676, 115, 15),
"shift", "Any", options);
form.addField(choiceField);
//富文本框
PdfTextFormField infoField = PdfTextFormField.createMultilineText(document.getPdfDocument(),
new Rectangle(158, 625, 366, 40), "info", "");
form.addField(infoField);
//提交按钮
PdfButtonFormField button = PdfFormField.createPushButton(document.getPdfDocument(),
new Rectangle(479, 594, 45, 15), "reset", "RESET");
button.setAction(PdfAction.createResetForm(new String[]{"name", "language", "experience1", "experience2", "experience3", "shift", "info"}, 0));
form.addField(button);
//扁平化操作--创建的pdf不能够修改内容
form.flattenFields();
PdfReader reader = new PdfReader("src.pdf");
PdfWriter writer = new PdfWriter("dest.pdf");
PdfDocument pdf = new PdfDocument(reader, writer);
PdfAcroForm form = PdfAcroForm.getAcroForm(pdf, true);
Map<String, PdfFormField> fields = form.getFormFields();
fields.get("name").setValue("James Bond");
fields.get("language").setValue("English");
//扁平化操作
form.flattenFields();
pdf.close();
PdfReader reader = new PdfReader("src.pdf");
PdfWriter writer = new PdfWriter("dest.pdf");
PdfDocument pdfDoc = new PdfDocument(reader, writer);
// add content,wait you add.重用以上的代码
pdfDoc.close();
PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
PdfDocument sourcePdf = new PdfDocument(new PdfReader(SRC));
//原始页面
PdfPage origPage = sourcePdf.getPage(1);
Rectangle orig = origPage.getPageSize();
PdfFormXObject pageCopy = origPage.copyAsFormXObject(pdf);
//n个小页面
PageSize nUpPageSize = PageSize.A4.rotate();
PdfPage page = pdf.addNewPage(nUpPageSize);
PdfCanvas canvas = new PdfCanvas(page);
//缩放页面
AffineTransform transformationMatrix = AffineTransform.getScaleInstance(
nUpPageSize.getWidth() / orig.getWidth() / 2f,
nUpPageSize.getHeight() / orig.getHeight() / 2f);
canvas.concatMatrix(transformationMatrix);
//将小页面存放到大页面上
canvas.addXObject(pageCopy, 0, orig.getHeight());
canvas.addXObject(pageCopy, orig.getWidth(), orig.getHeight());
canvas.addXObject(pageCopy, 0, 0);
canvas.addXObject(pageCopy, orig.getWidth(), 0);
pdf.close();
sourcePdf.close();
PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
PdfMerger merger = new PdfMerger(pdf);
PdfDocument firstSourcePdf = new PdfDocument(new PdfReader(SRC1));
merger.addPages(firstSourcePdf, 1, firstSourcePdf.getNumberOfPages());
PdfDocument secondSourcePdf = new PdfDocument(new PdfReader(SRC2));
merger.addPages(secondSourcePdf, 1, secondSourcePdf.getNumberOfPages());
merger.merge();
firstSourcePdf.close();
secondSourcePdf.close();
pdf.close();
PdfADocument pdf = new PdfADocument(new PdfWriter(dest),
PdfAConformanceLevel.PDF_A_1B,
new PdfOutputIntent("Custom",
"",
"http://www.color.org",
"sRGB IEC61966-2.1",
new FileInputStream("sRGB_CS_profile.icm")));
Document document = new Document(pdf);
//其他渲染pdf文档操作
......
document.close();
本质：将纯静态的html+css的组合文档转化为pdf文档
hello入门：
2.1 将html转化为pdf：
//将字符串类型html转化为pdf
String html = "<h1>Test</h1><p>Hello World</p>";
HtmlConverter.convertToPdf(html, new FileOutputStream("stringHtmlToPdf.pdf"));
//将html文件转化为pdf
String html = "htmlFileToPdf.html";
String htmlLoc = BASEURI + html;
HtmlConverter.convertToPdf(new File(htmlLoc), new File("htmlFileToPdf.pdf"));
//以stream2Stream的形式将html文件转化为pdf
HtmlConverter.convertToPdf(new FileInputStream(htmlLoc), new FileOutputStream("stream2Stream.pdf"));
//以stream2Writer的形式将html文件转化为pdf
PdfWriter writer = new PdfWriter("stream2Writer.pdf", new WriterProperties().setFullCompressionMode(true));
HtmlConverter.convertToPdf(new FileInputStream(htmlLoc), writer);
//以stream2Document的形式将html文件转化为pdf
PdfWriter writer = new PdfWriter("stream2Document.pdf");
PdfDocument pdf = new PdfDocument(writer);
pdf.setTagged();
HtmlConverter.convertToPdf(new FileInputStream(htmlLoc), pdf);
2.2 将html转化为iText对象
//转化为Document对象
String html = "htmlFileToPdf.html";
String htmlLoc = BASEURI + html;
PdfWriter writer = new PdfWriter("html2ItextObj.pdf");
PdfDocument pdf = new PdfDocument(writer);
pdf.setTagged();
Document document = HtmlConverter.convertToDocument(new FileInputStream(htmlLoc), pdf,null);
document.add(new Paragraph("Goodbye!"));
document.close();
//转化为Element对象
String html = "htmlFileToPdf.html";
String htmlLoc = BASEURI + html;
List<IElement> elements = HtmlConverter.convertToElements(new FileInputStream(htmlLoc), null);
PdfDocument pdf = new PdfDocument(new PdfWriter("html2Element.pdf"));
Document document = new Document(pdf);
for (IElement element : elements) {
document.add(new Paragraph(element.getClass().getName())); //说明每个元素的类型
document.add((IBlockElement)element);
}
document.close();
Css样式在pdf中的渲染
3.1 示例：后台这边基本不改，主要是前端的css的修改。pdf可以渲染的css的种类有Old-fashioned HTML，inline css,internal css,external css
String html = "fontCss.html";
String htmlLoc = BASEURI + html;
HtmlConverter.convertToPdf(new File(htmlLoc), new File("oldCssToPdf.pdf"));
3.2 分页操作：
//使用@page：在html中使用。
//浏览器端无效，在pdf渲染可以在右下角添加当前页数
<style>
@page { @bottom-right {
content: "Page " counter(page) " of " counter(pages); }
}
</style>
//使用page-break-after,在html中使用
//浏览器端无效，在pdf渲染可以强制div后的内容进行分页
<div style="page-break-after: always; width: 320pt;">
将html中的布局格式转化到pdf
4.1 示例： 后台这边基本不改，主要是前端的css的修改。根据设备的类型调整pdf页面的大小，渲染符合条件的文档。核心是@media only screen
//这是css布局，不同的页面设置不同的布局方式
/*Desktop*/
@media only screen and (min-width: 768px ) {
.col-1 {width:24.9%;}
.col-2 {width: 33.32%;}
.col-3 {width: 49%;}
.col-4 {width: 99%;}
p{
font-size: 12pt;
}
h1{
font-size: 20pt;
}
h2{
font-size:16pt
}
}
......
//后台代码
String html = "layout.html";
String htmlLoc = BASEURI + html;
PdfWriter writer = new PdfWriter("deskLayoutToPdf.pdf");
PdfDocument pdf = new PdfDocument(writer);
pdf.setTagged();
PageSize pageSize = PageSize.A4.rotate();
pdf.setDefaultPageSize(pageSize);
ConverterProperties properties = new ConverterProperties();
properties.setBaseUri(BASEURI);
//核心，对应css样式中的 @media only screen
MediaDeviceDescription mediaDeviceDescription = new MediaDeviceDescription(MediaType.SCREEN);
mediaDeviceDescription.setWidth(pageSize.getWidth());
properties.setMediaDeviceDescription(mediaDeviceDescription);
HtmlConverter.convertToPdf(new FileInputStream(htmlLoc), pdf, properties);
//渲染成桌面应用布局
PageSize pageSize = PageSize.A4.rotate();
//渲染成平板布局
PageSize pageSize = new PageSize(575, 1500);
//渲染成智能手机布局
PageSize pageSize = new PageSize(440, 2000);
使用pdfhtml创建报表
5.1 将xml数据文件转化为html,然后将对html文件转化为pdf
//重点是前端的xml和xsl文件
ByteArrayOutputStream baos = new ByteArrayOutputStream();
Writer writer = new OutputStreamWriter(baos);
StreamSource xml = new StreamSource(new File(BASEURI+"movie.xml"));
StreamSource xsl = new StreamSource(new File(BASEURI+"movie.xsl"));
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer(xsl);
transformer.transform(xml, new StreamResult(writer));
writer.flush();
writer.close();
byte[] res=baos.toByteArray();
HtmlConverter.convertToPdf(new ByteArrayInputStream(res), new FileOutputStream("xmlToHtmlToPdf.pdf"));
5.2 使用事件监听添加水印
//添加事件监听
IEventHandler handler = new BackgroundListener(pdf, "hello.pdf");
pdf.addEventHandler(PdfDocumentEvent.START_PAGE, handler);
HtmlConverter.convertToPdf(new FileInputStream(htmlLoc), pdf);
//实现事件监听接口
public class BackgroundListener implements IEventHandler {
PdfXObject stationery;
public BackgroundListener(PdfDocument pdf, String src) throws IOException {
PdfDocument template = new PdfDocument(new PdfReader(src));
PdfPage page = template.getPage(1);
stationery = page.copyAsFormXObject(pdf);
template.close();
}
@Override
public void handleEvent(Event event) {
PdfDocumentEvent docEvent = (PdfDocumentEvent) event;
PdfDocument pdf = docEvent.getDocument();
PdfPage page = docEvent.getPage();
PdfCanvas pdfCanvas = new PdfCanvas(page.newContentStreamBefore(), page.getResources(), pdf);
pdfCanvas.addXObject(stationery, 0, 0);
Rectangle rect = new Rectangle(36, 32, 36, 64);
Canvas canvas = new Canvas(pdfCanvas, pdf, rect);
canvas.add(new Paragraph(String.valueOf(pdf.getNumberOfPages()))
.setFontSize(48)
.setFontColor(ColorConstants.RED));
canvas.close();
}
}
5.3 将页面高度大于1页的html存放到1页的pdf中
PdfWriter pwriter = new PdfWriter("largeHtmlToOnePdf.pdf");
PdfDocument pdf = new PdfDocument(pwriter);
pdf.setDefaultPageSize(new PageSize(595, 14400));
Document document = HtmlConverter.convertToDocument(new ByteArrayInputStream(res), pdf,null);
EndPosition endPosition = new EndPosition();
LineSeparator separator = new LineSeparator(endPosition);
document.add(separator);
document.getRenderer().close();
//调整单页pdf的高度
PdfPage page = pdf.getPage(1);
float y = endPosition.getY() - 36;
page.setMediaBox(new Rectangle(0, y, 595, 14400 - y));
document.close();
5.4 创建特殊类型pdf文档：
//注意：需要事先在html中添加字符集，否则报错字体没嵌入
//比如：<body style=""font-family: FreeSans"></body>
PdfWriter writer = new PdfWriter("htmlToPdfA2B.pdf");
PdfADocument pdf = new PdfADocument(writer,
PdfAConformanceLevel.PDF_A_2B,
new PdfOutputIntent("Custom",
"",
"http://www.color.org",
"sRGB IEC61966-2.1",
new FileInputStream("src/main/resources/sRGB_CS_profile.icm")));
HtmlConverter.convertToPdf(new FileInputStream(htmlLoc), pdf);
使用自定义的tag标签
6.1 示例：浏览器无法解析该标签，但是pdf可以
//html添加一个自定义<name>标签
<name>this is define name tag</name>
//后台操作
ConverterProperties converterProperties = new ConverterProperties();
converterProperties.setTagWorkerFactory(new DefaultTagWorkerFactory() {
@Override
public ITagWorker getCustomTagWorker( IElementNode tag, ProcessorContext context) {
if ("name".equalsIgnoreCase(tag.name()) ) {
return new SpanTagWorker(tag, context){
@Override
public boolean processContent(String content, ProcessorContext context) {
return super.processContent("Bruno Lowagie", context);
}
};
}
return null;
}
});
HtmlConverter.convertToPdf(new File(htmlLoc), new File("customtagsToPdf.pdf"), converterProperties);
使用自定义的Css样式
7.1 示例： 浏览器无法解析该样式，但是pdf可以
//html添加一个自定义样式kleur: groen
<div style="kleur: groen;"></div>
//后台操作
ConverterProperties converterProperties = new ConverterProperties();
converterProperties.setCssApplierFactory(new DefaultCssApplierFactory() {
ICssApplier dutchCssColor = new DutchColorCssApplier();
@Override
public ICssApplier getCustomCssApplier(IElementNode tag) {
if( tag.name().equals(TagConstants.DIV) ){
return dutchCssColor;
}
return null;
}
});
HtmlConverter.convertToPdf(new File(htmlLoc), new File("customCssToPdf.pdf"), converterProperties);
//实现样式接口
public class DutchColorCssApplier extends BlockCssApplier {
public static final Map<String, String> KLEUR = new HashMap<String, String>();
static {
KLEUR.put("groen", "green");
}
@Override
public void apply(ProcessorContext context, IStylesContainer stylesContainer, ITagWorker tagWorker){
Map<String, String> cssStyles = stylesContainer.getStyles();
if(cssStyles.containsKey("kleur")){
cssStyles.put(CssConstants.COLOR,KLEUR.get(cssStyles.get("kleur")));
stylesContainer.setStyles(cssStyles);
}
super.apply(context, stylesContainer,tagWorker);
}
}
在pdfhtml中使用字体
8.1 示例： 后台基本不变，前端htm可以使用14种标准字体，itext附带的12中常规字体，以及系统字体
String html = "font_standardtype1.html";
String htmlLoc = BASEURI + html;
HtmlConverter.convertToPdf(new File(htmlLoc), new File("standardType1ToPdf.pdf"));
8.2 Web开放字体的使用
//当前端需要的字体本机没有时，通过@font-face自动下载，在html页面设置
@font-face {
font-family: "SourceSerifPro-Regular";
src: url("fonts/SourceSerifPro-Regular.otf.woff") format("woff");
}
.regular {
font-family: "SourceSerifPro-Regular";
}
<td class="regular">lalalalalalal</td>
8.3 使用指定字体渲染pdf中指定部分，和html呼应
//指定单个字体
FontProvider fontProvider = new DefaultFontProvider();
FontProgram fontProgram = FontProgramFactory.createFont(BASEURI+"font/Cardo-Regular.ttf");
fontProvider.addFont(fontProgram);
ConverterProperties properties = new ConverterProperties();
properties.setFontProvider(fontProvider);
HtmlConverter.convertToPdf(new File(htmlLoc), new File("addExtraFontToPdf.pdf"), properties);
//指定字体目录
FontProvider fontProvider = new DefaultFontProvider();
fontProvider.addDirectory(BASEURI+"/font/");
ConverterProperties properties = new ConverterProperties();
properties.setFontProvider(fontProvider);
HtmlConverter.convertToPdf(new File(htmlLoc), new File("addExtraFontDirToPdf.pdf"), properties);
8.4 国际化操作：也是添加对应的字体即可
String html = "i18n.html";
String htmlLoc = BASEURI + html;
ConverterProperties properties = new ConverterProperties();
FontProvider fontProvider = new DefaultFontProvider(false, false, false);
String[] fonts = {
"src/main/resources/font/NotoSans-Regular.ttf",
"src/main/resources/font/NotoSans-Bold.ttf",
"src/main/resources/font/NotoSansCJKsc-Regular.otf",
"src/main/resources/font/NotoNaskhArabic-Regular.ttf",
"src/main/resources/font/NotoSansHebrew-Regular.ttf"
};
for (String font : fonts) {
FontProgram fontProgram = FontProgramFactory.createFont(font);
fontProvider.addFont(fontProgram);
}
properties.setFontProvider(fontProvider);
HtmlConverter.convertToPdf(new File(htmlLoc), new File("internationalizationToPdf.pdf"), properties);
8.4 解决中文无法显示问题--添加NotoSansCJKsc-Regular.otf字体
String html = "chineseGarble.html";
String htmlLoc = BASEURI + html;
ConverterProperties properties = new ConverterProperties();
FontProvider fontProvider = new DefaultFontProvider();
FontProgram fontProgram = FontProgramFactory.createFont(BASEURI+"font/NotoSansCJKsc-Regular.otf");
fontProvider.addFont(fontProgram);
properties.setFontProvider(fontProvider);
HtmlConverter.convertToPdf(new File(htmlLoc), new File("chineseGarbledToPdf.pdf"), properties);
注意事项
9.1 如何将ASP或JSP页面转换为PDF?
答：对html的抽象，需要开发者自行将其创建为html。pdfHtml只能解析htm和css
9.2 如何将多个HTML文件解析为一个PDF?
答：第一种：将每个HTML转换为内存中的一个单独的PDF文件。使用pdfmerge将这些文件合并为单个PDF。可能存在中间有大量空格
public void createPdf(String baseUri, String[] src, String dest) throws IOException {
ConverterProperties properties = new ConverterProperties();
properties.setBaseUri(baseUri);
PdfWriter writer = new PdfWriter(dest);
PdfDocument pdf = new PdfDocument(writer);
PdfMerger merger = new PdfMerger(pdf);
for (String html : src) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PdfDocument temp = new PdfDocument(new PdfWriter(baos));
HtmlConverter.convertToPdf(new FileInputStream(html), temp, properties);
temp = new PdfDocument(new PdfReader(new ByteArrayInputStream(baos.toByteArray())));
merger.merge(temp, 1, temp.getNumberOfPages());
temp.close();
}
pdf.close();
}
第二种: (推荐--页面更加紧凑) 将不同的HTML文件解析为一系列iText元素。我们将所有这些元素添加到一个PDF文档中。
public void createPdf(String baseUri, String[] src, String dest) throws IOException {
ConverterProperties properties = new ConverterProperties();
properties.setBaseUri(baseUri);
PdfWriter writer = new PdfWriter(dest);
PdfDocument pdf = new PdfDocument(writer);
Document document = new Document(pdf);
for (String html : src) {
List<IElement> elements =
HtmlConverter.convertToElements(new FileInputStream(html), properties);
for (IElement element : elements) {
document.add((IBlockElement)element);
}
}
document.close();
}
9.3 可以从URL生成PDF而不是从磁盘上的文件?
答：
createPdf(new URL("https://stackoverflow.com/help/on-topic"), DEST);
public void createPdf(URL url, String dest) throws IOException {
HtmlConverter.convertToPdf(url.openStream(), new FileOutputStream(dest));
}
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