利用iText将html转为pdf设置不同的样式以及报表
本教程只是作为自己的总结使用，主要参考于官网的文档：https://developers.itextpdf.com/
这个是一系列的介绍的方式，转化pdf入门请转入：利用itext将html文件转化pdf文件
这里我们介绍几个关于pdf输出的形式。
1、将生成的pdf文件作为输出的媒体形式
在这里面引入MediaDeviceDescription属性，用来设置ConverterProperties添加在转化的过程中。
如果设置为print的方式，意味着所有的文件的都是黑白的颜色，消除了所有的彩色。
package com.ctbri.test3;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import com.itextpdf.html2pdf.ConverterProperties;
import com.itextpdf.html2pdf.HtmlConverter;
import com.itextpdf.html2pdf.css.media.MediaDeviceDescription;
import com.itextpdf.html2pdf.css.media.MediaType;
/**
* 转换的方式用print的方式
*/
public class C03E02_Print {
public static final String BASEURI = "src/main/resources/html/";
public static final String SRC = String.format("%ssxsw.html", BASEURI);
public static final String TARGET = "target/results/ch03/";
public static final String DEST = String.format("%ssxsw_print.pdf", TARGET);
public static void main(String[] args) throws IOException {
File file = new File(TARGET);
file.mkdirs();
new C03E02_Print().createPdf(BASEURI, SRC, DEST);
}
public void createPdf(String baseUri, String src, String dest) throws IOException {
ConverterProperties properties = new ConverterProperties();
properties.setBaseUri(baseUri);
// 设置媒体的描述方式
MediaDeviceDescription mediaDeviceDescription = new MediaDeviceDescription(MediaType.PRINT);
properties.setMediaDeviceDescription(mediaDeviceDescription);
HtmlConverter.convertToPdf(new FileInputStream(src), new FileOutputStream(dest), properties);
}
}
2、设置生成的pdf所属的媒体设别样式(pdf大小)
2.1 适合于桌面应用
修改pdf的默认大小以及适合的媒体显示的方式，如下面代码中的介绍。
package com.ctbri.test3;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import com.itextpdf.html2pdf.ConverterProperties;
import com.itextpdf.html2pdf.HtmlConverter;
import com.itextpdf.html2pdf.css.media.MediaDeviceDescription;
import com.itextpdf.html2pdf.css.media.MediaType;
import com.itextpdf.kernel.geom.PageSize;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
/**
* 创建的pdf适合于桌面设备查看
*/
public class C03E03_Wide {
public static final String BASEURI = "src/main/resources/html/";
public static final String SRC = String.format("%ssxsw.html", BASEURI);
public static final String TARGET = "target/results/ch03/";
public static final String DEST = String.format("%ssxsw_wide.pdf", TARGET);
public static void main(String[] args) throws IOException {
File file = new File(TARGET);
file.mkdirs();
new C03E03_Wide().createPdf(BASEURI, SRC, DEST);
}
public void createPdf(String baseUri, String src, String dest) throws IOException {
PdfWriter writer = new PdfWriter(dest);
PdfDocument pdf = new PdfDocument(writer);
pdf.setTagged();
//设置纸张的大小，并且设置默认的pdf大小
PageSize pageSize = PageSize.A4.rotate();
pdf.setDefaultPageSize(pageSize);
ConverterProperties properties = new ConverterProperties();
properties.setBaseUri(baseUri);
// 设置pdf的显示方式，用sreen代替print
MediaDeviceDescription mediaDeviceDescription = new MediaDeviceDescription(MediaType.SCREEN);
mediaDeviceDescription.setWidth(pageSize.getWidth());
properties.setMediaDeviceDescription(mediaDeviceDescription);
HtmlConverter.convertToPdf(new FileInputStream(src), pdf, properties);
}
}
2.2 适合于移动设备
public void createPdf(String baseUri, String src, String dest) throws IOException {
PdfWriter writer = new PdfWriter(dest);
PdfDocument pdf = new PdfDocument(writer);
pdf.setTagged();
PageSize pageSize = new PageSize(440, 2000);
pdf.setDefaultPageSize(pageSize);
ConverterProperties properties = new ConverterProperties();
properties.setBaseUri(baseUri);
MediaDeviceDescription mediaDeviceDescription
= new MediaDeviceDescription(MediaType.SCREEN);
mediaDeviceDescription.setWidth(pageSize.getWidth());
properties.setMediaDeviceDescription(mediaDeviceDescription);
HtmlConverter.convertToPdf(new FileInputStream(src), pdf, properties);
}2 创建报表
2.1 利用XSLT将xml转化为html
文中参考的xml文件来源于：xml源文件 xsl原文件
package com.ctbri.test4;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import com.itextpdf.html2pdf.ConverterProperties;
import com.itextpdf.html2pdf.HtmlConverter;
/**
* Creates a PDF document from an XML file using XSLT to convert the XML to
* HTML.
*/
public class C04E01_MovieTable {
public static final String BASEURI = "src/main/resources/html/";
// xml文件路径
public static final String XML = "src/main/resources/xml/movies.xml";
// xsl文件路径
public static final String XSL = "src/main/resources/xml/movies_table.xsl";
public static final String TARGET = "target/results/ch04/";
public static final String DEST = String.format("%smovie_table.pdf", TARGET);
public static void main(String[] args) throws IOException, TransformerException {
File file = new File(TARGET);
file.mkdirs();
C04E01_MovieTable app = new C04E01_MovieTable();
app.createPdf(app.createHtml(XML, XSL), BASEURI, DEST);
}
/**
* Creates the PDF file.
*/
public void createPdf(byte[] html, String baseUri, String dest) throws IOException {
ConverterProperties properties = new ConverterProperties();
properties.setBaseUri(baseUri);
HtmlConverter.convertToPdf(new ByteArrayInputStream(html), new FileOutputStream(dest), properties);
}
/**
* 通过xml文件上执行xstl转化创建html文件
*/
public byte[] createHtml(String xmlPath, String xslPath) throws IOException, TransformerException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
Writer writer = new OutputStreamWriter(baos);
StreamSource xml = new StreamSource(new File(xmlPath));
StreamSource xsl = new StreamSource(new File(xslPath));
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer(xsl);
transformer.transform(xml, new StreamResult(writer));
writer.flush();
writer.close();
return baos.toByteArray();
}
}
2.2 、创建背景颜色以及header、footer
主要内容参见下面代码中的注释以及后面的解释：
/**
* Creates a PDF document from an XML file using XSLT to convert the XML to HTML
*/
public class C04E02_MovieTable2 {
public static final String BASEURI = "src/main/resources/html/";
/** The XML containing all the data. */
public static final String XML = "src/main/resources/xml/movies.xml";
/** The XSLT needed to transform the XML to HTML. */
public static final String XSL = "src/main/resources/xml/movies_table.xsl";
public static final String TARGET = "target/results/ch04/";
public static final String DEST = String.format("%smovie_table2.pdf", TARGET);
public static final String STATIONERY = "src/main/resources/pdf/stationery.pdf";
/**
* The main method
*/
public static void main(String[] args) throws IOException, TransformerException {
File file = new File(TARGET);
file.mkdirs();
C04E02_MovieTable2 app = new C04E02_MovieTable2();
app.createPdf(app.createHtml(XML, XSL), BASEURI, STATIONERY, DEST);
}
/**
* Creates the PDF file.
*/
public void createPdf(byte[] html, String baseUri, String stationery, String dest) throws IOException {
ConverterProperties properties = new ConverterProperties();
properties.setBaseUri(baseUri);
PdfWriter writer = new PdfWriter(dest);
PdfDocument pdf = new PdfDocument(writer);
IEventHandler handler = new Background(pdf, stationery);
pdf.addEventHandler(PdfDocumentEvent.START_PAGE, handler);
HtmlConverter.convertToPdf(new ByteArrayInputStream(html), pdf, properties);
}
/**
* Creates an HTML file by performing an XSLT transformation on an XML file.
* @param xmlPath the path to the XML file.
* @param xslPath the path to the XSL file
* @return the resulting HTML as a byte[]
*/
public byte[] createHtml(String xmlPath, String xslPath) throws IOException, TransformerException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
Writer writer = new OutputStreamWriter(baos);
StreamSource xml = new StreamSource(new File(xmlPath));
StreamSource xsl = new StreamSource(new File(xslPath));
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer(xsl);
transformer.transform(xml, new StreamResult(writer));
writer.flush();
writer.close();
return baos.toByteArray();
}
/**
* 通过实现 IEventHandler 接口来显示添加背景颜色以及每一页的数字
*/
class Background implements IEventHandler {
/** The Form XObject that will be added as the background for every page. */
PdfXObject stationery;
/**
* 实例化background对象
*/
public Background(PdfDocument pdf, String src) throws IOException {
PdfDocument template = new PdfDocument(new PdfReader(src)); //实例化pdfDocument
PdfPage page = template.getPage(1); //获得template的第一页
stationery = page.copyAsFormXObject(pdf); //复制获取的pdf并且作为PdfXObject对象
template.close();
}
//用来处理事件
public void handleEvent(Event event) {
PdfDocumentEvent docEvent = (PdfDocumentEvent) event;
//实例化一个pdfDocument对象
PdfDocument pdf = docEvent.getDocument();
PdfPage page = docEvent.getPage();
PdfCanvas pdfCanvas = new PdfCanvas(page.newContentStreamBefore(), page.getResources(), pdf);
pdfCanvas.addXObject(stationery, 0, 0); //添加一个单一的pdf作为背景
Rectangle rect = new Rectangle(36, 32, 36, 64); //添加数字的位置
Canvas canvas = new Canvas(pdfCanvas, pdf, rect); //利用之前创建的pdfCanvas创建一个更加高级的对象
//将新的页面添加到高级额Canvas中，并且设置字码的大小和颜色
canvas.add(new Paragraph(String.valueOf(pdf.getNumberOfPages())).setFontSize(48).setFontColor(Color.WHITE));
canvas.close();
}
}那个怎么出发handEven事件呢？具体的方法写在createPdf中
- 首先创建background的实例对象，并且命名为IEventHandler对象的handler。
- 实例化的
PdfDocument对象利用addEventHandler()方法将对象添加到方法中去
2.3 、将html文件转化到一个单一的pdf文件中
如何自定义一个pdf的长度，设置pdf的长度：
public void createPdf(byte[] html, String baseUri, String dest)
throws IOException {
ConverterProperties properties = new ConverterProperties();
properties.setBaseUri(baseUri);
PdfWriter writer = new PdfWriter(dest);
PdfDocument pdf = new PdfDocument(writer);
pdf.setDefaultPageSize(new PageSize(595, 14400));
Document document = HtmlConverter.convertToDocument(
new ByteArrayInputStream(html), pdf, properties);
EndPosition endPosition = new EndPosition();
LineSeparator separator = new LineSeparator(endPosition);
document.add(separator);
document.getRenderer().close();
PdfPage page = pdf.getPage(1);
float y = endPosition.getY() - 36;
page.setMediaBox(new Rectangle(0, y, 595, 14400 - y));
document.close();
}2.4、为报表加上书签
类似与word里面的添加目录
只需要在ConverterProperties 中添加上
OutlineHandler outlineHandler = OutlineHandler.createStandardHandler(); public void createPdf(byte[] html, String baseUri, String dest) throws IOException {
ConverterProperties properties = new ConverterProperties();
properties.setBaseUri(baseUri);
OutlineHandler outlineHandler = new OutlineHandler();
//h1设置为一级标题
outlineHandler.putTagPriorityMapping("h1", 1);
//将p设置为二级标题
outlineHandler.putTagPriorityMapping("p", 2);
properties.setOutlineHandler(outlineHandler);
HtmlConverter.convertToPdf(new ByteArrayInputStream(html), new FileOutputStream(dest), properties);
}