itextpdf生成pdf,html转pdf,pdf转图片

* 利用iText五步创建一个PDF文件：
* 第一步，创建一个 iTextSharp.text.Document对象的实例：Document document = new Document();
* 第二步，为该Document创建一个Writer实例：PdfWriter.getInstance(document, new FileStream("demo.pdf", FileMode.Create));
* 第三步，打开当前Document document.Open();
* 第四步，为当前Document添加内容： document.Add(new Paragraph("Hello World"));
* 第五步，关闭Document  document.Close();

主要涉及的类有Document，Paragraph，Font，PdfPTable，PdfPCell。具体涉及的方法参数比较多，需要自己多尝试体会。如果内容是中文的话，需要注意设置下编码，否则内容不显示

    /*** 获取支持中文编码的Font** @param size* @return* @throws IOException* @throws DocumentException*/public static Font getPdfChineseFont(int size) throws IOException, DocumentException {BaseFont bfChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);Font fontChinese = new Font(bfChinese, size, Font.NORMAL);return fontChinese;}

依赖的JAR

 <!--itextpdf  生成pdf -->    
<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><!-- pdf转图片 --><dependency><groupId>org.icepdf.os</groupId><artifactId>icepdf-core</artifactId><version>6.1.2</version></dependency>

1 ItemxtPdf生成pdf的demo

package org.springblade.modules.lecoffee.utils;import com.itextpdf.text.*;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;
import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Component;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;@Component
public class ItextPdfUtilsDemo {/*** 利用iText五步创建一个PDF文件：* 第一步，创建一个 iTextSharp.text.Document对象的实例：Document document = new Document();* 第二步，为该Document创建一个Writer实例：PdfWriter.getInstance(document, new FileStream("demo.pdf", FileMode.Create));* 第三步，打开当前Document document.Open();* 第四步，为当前Document添加内容： document.Add(new Paragraph("Hello World"));* 第五步，关闭Document  document.Close();*/public static void createPdf2() throws Exception {// 基本设置FileOutputStream fos = new FileOutputStream("D:\\F\\down\\demo.pdf");Document document = new Document();PdfWriter writer = PdfWriter.getInstance(document, fos);writer.setViewerPreferences(PdfWriter.PageModeUseThumbs);//设置纸张大小document.setPageSize(PageSize.A4);document.open();document = setHeaderPic(document, "C:\\uploadFiles\\logo.jpg");setHeader(document);//手动新页面document.newPage();// table 列宽--这里是四列float[] widths = {131, 233, 92, 69};PdfPTable table = new PdfPTable(widths);// A4的595减去两个边距35*2table.setTotalWidth(525);// 固定table的宽度table.setLockedWidth(true);table.setHorizontalAlignment(Element.ALIGN_CENTER);String[] colArr = {"套餐类型", "套餐明细", "费用", "数量"};String[][] datas = {{"套餐1", "明细1", "费用1", "数量1"}, {"套餐2", "明细2", "费用2", "数量2"}, {"套餐3", "明细3", "费用3", "数量3"}};/*** table基本组成是cell* addCell(PdfCell cell) 方法会将一个个的cell依次加入到table中，添加到最后一列后会自动换行*/for (int i = 0; i < colArr.length; i++) {PdfPCell pdfCell = new PdfPCell(); //表格的单元格pdfCell.setMinimumHeight(30);//设置表格行高pdfCell.setHorizontalAlignment(Element.ALIGN_CENTER);pdfCell.setVerticalAlignment(Element.ALIGN_MIDDLE);//左右侧边框不显示pdfCell.disableBorderSide(PdfPCell.LEFT);pdfCell.disableBorderSide(PdfPCell.RIGHT);// 设置边框样式，粗细，背景色// pdfCell.setBorder(PdfPCell.TOP);pdfCell.setBorderWidth(1);pdfCell.setBorderColor(new BaseColor(200, 200, 200));// 背景色//    pdfCell.setBackgroundColor(new BaseColor(68,114,196));//文本样式Font font = getPdfChineseFont(12);font.setSize(12);font.setStyle(Font.BOLD);Paragraph paragraph = new Paragraph(colArr[i], font);pdfCell.setPhrase(paragraph);table.addCell(pdfCell);}for (int i = 0; i < datas.length; i++) {for (int j = 0; j < datas[i].length; j++) {PdfPCell pdfCell = new PdfPCell();pdfCell.setHorizontalAlignment(Element.ALIGN_CENTER);pdfCell.setVerticalAlignment(Element.ALIGN_MIDDLE);pdfCell.setBackgroundColor(new BaseColor(0xdd7e6b));pdfCell.setBorderWidthTop(0.1f);pdfCell.setBorderWidthBottom(0.1f);pdfCell.setBorderWidthLeft(0.1f);pdfCell.setBorderWidthRight(0.1f);pdfCell.setBorderColorBottom(new BaseColor(0x674ea7));pdfCell.setBorderColorLeft(new BaseColor(0x674ea7));pdfCell.setBorderColorRight(new BaseColor(0x674ea7));pdfCell.setBorderColorTop(new BaseColor(0x674ea7));Font font = getPdfChineseFont(12);Paragraph paragraph = new Paragraph(datas[i][j], font);pdfCell.setPhrase(paragraph);table.addCell(pdfCell);}}//添加图片，添加的图片需要提供本地地址byte[] bt = FileUtils.readFileToByteArray(new File("D:\\F\\down/back.jpg"));PdfPCell pdfCell = new PdfPCell();pdfCell.setImage(Image.getInstance(bt));//插入图片table.addCell(pdfCell);table.addCell(new PdfPCell());table.addCell(new PdfPCell());table.addCell(new PdfPCell());// 合并单元格PdfPCell pdfCell2 = new PdfPCell();pdfCell2.setMinimumHeight(30);pdfCell2.setHorizontalAlignment(Element.ALIGN_CENTER);pdfCell2.setVerticalAlignment(Element.ALIGN_MIDDLE);Font font = getPdfChineseFont(12);pdfCell2.setRowspan(1);pdfCell2.setColspan(4);//  pdfCell2.setBorder(pdfCell2.BOTTOM+PdfPCell.LEFT);pdfCell2.setBorderWidth(2);pdfCell2.setHorizontalAlignment(Element.ALIGN_RIGHT);Paragraph paragraph = new Paragraph("总价：4896 元\n仅首次", font);pdfCell2.setPhrase(paragraph);table.addCell(pdfCell2);document.add(table);document.close();}public static Document setHeaderPic(Document document, String mImgPath) throws Exception {Image tImgCover = Image.getInstance(mImgPath );/* 设置图片的位置 */tImgCover.setAbsolutePosition(440, 772);/* 设置图片的大小 */tImgCover.scaleAbsolute(80, 39);document.add(tImgCover);return document;}public static Document setHeader(Document document) throws Exception {Paragraph title = new Paragraph();Font fontTile = getPdfChineseFont(16);fontTile.setStyle(Font.BOLD);title.setFont(fontTile);title.add("\n\n\n\n雨巷");title.setAlignment(Paragraph.ALIGN_CENTER);document.add(title);Paragraph content = new Paragraph();Font fontContent = getPdfChineseFont(12);content.setFont(fontContent);content.add("撑着油纸伞，独自 \n" +"彷徨在悠长、悠长 \n" +"又寂寥的雨巷 \n" +"我希望逢着 \n" +"一个丁香一样地 \n" +"结着愁怨的姑娘 ");content.setAlignment(Paragraph.ALIGN_CENTER);document.add(content);return document;}public static void main(String[] args) throws Exception {createPdf2();}/*** 获取支持中文编码的Font** @param size* @return* @throws IOException* @throws DocumentException*/public static Font getPdfChineseFont(int size) throws IOException, DocumentException {BaseFont bfChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);Font fontChinese = new Font(bfChinese, size, Font.NORMAL);return fontChinese;}
}

结果：

2 html 生成pdf，有几个注意的点。

2.1 标签语法比较严格，不能有不完整的标签"<div>"，“<img>”都不行。需要改成"<div></div>"和"<img/>"

2.2 不能引用外部样式和js，所有的代码最好在body标签内；

2.3 有些语法单位不支持或者不起作用。

2.4 不同的标签在生成pdf后处理方式可能不一致比如 <p>hello</p>和<span><span>生成pdf后间距等会有出入；

整体来说，hmtl转pdf的优点就是代码相对简单，但是对于样式要求严格的场景也会比较麻烦，会有不小的出入。

1个小建议：html转pdf，最好一开始先调用一下document.newPage()这个方法，这样会避免生成的pdf第一页的间距与后面不一致的情况。然后 img标签最好设置一下高度和宽度，且图片的协议最好是https。

package org.springblade.modules.lecoffee.utils;import com.itextpdf.text.Document;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.tool.xml.XMLWorkerFontProvider;
import com.itextpdf.tool.xml.XMLWorkerHelper;
import lombok.extern.log4j.Log4j;
import org.springframework.stereotype.Component;import java.io.ByteArrayInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;@Log4j
@Component
public class Html2PdfPageDemo extends XMLWorkerFontProvider {public static void htmlToPDFPage(List<String> htmlString, String pdfPath) throws Exception {System.out.println(htmlString);Document document = new Document(PageSize.A4);PdfWriter pdfWriter = PdfWriter.getInstance(document, new FileOutputStream(pdfPath));document.open();document.setMargins(0, 0, 0, 0);document.addAuthor("big");document.addCreator("q");document.addSubject("subject");document.addCreationDate();document.addTitle("主题");XMLWorkerHelper worker = XMLWorkerHelper.getInstance();InputStream inputStream = null;document.newPage();worker.parseXHtml(pdfWriter, document, new ByteArrayInputStream(pageHome.getBytes("UTF-8")), inputStream, Charset.forName("UTF-8"), new AsianFontProvider());for (String html : htmlString) {document.newPage();worker.parseXHtml(pdfWriter, document, new ByteArrayInputStream(html.getBytes("UTF-8")), inputStream, Charset.forName("UTF-8"), new AsianFontProvider());}document.close();}static String pageHome ="\t<body>\n" +"\t\t<style>\n" +"\t\t\t* {\n" +"\t\t\t\tmargin: 0;\n" +"\t\t\t\tpadding: 0;\n" +"\t\t\t}\n" +"\t\t</style>\n" +"\t\t<div class=\"header\" style=\"text-align: right;padding-top: 30px;padding-right: 50px;\">\n" +"\t\t\t<img style=\"width: 137.75px;height: 48.25px;\" src=\"https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=2164552727,1674393781&fm=26&gp=0.jpg\" alt=\"\" class=\"logo\" />\n" +"\t\t</div>\n" +"\t\t<br />\n" +"\t\t<br />\n" +"\t\t<div class=\"content-wrap\" style=\"padding: 0 50px;\">\n" +"\t\t\t<div class=\"content\">\n" +"\t\t\t\t<div style=\"font-size: 14px;line-height: 1;\">Are you ok? </div>\n" +"\t\t\t\t<br />\n" +"\t\t\t\t<div style=\"font-size: 14px;line-height: 1;\">How are you </div>\n" +"\t\t\t\t<br />\n" +"\t\t\t\t<div style=\"font-size: 14px;line-height: 1;\">fine thank you</div>\n" +"\t\t\t</div>\n" +"\t\t</div>\n" +"\t</body>";static String pageTable = "\t<body>\n" +"\t\t<style>\n" +"\t\t\t* {\n" +"\t\t\t\tmargin: 0;\n" +"\t\t\t\tpadding: 0;\n" +"\t\t\t}\n" +"\t\t\t\n" +"\t\t\ttable {\n" +"\t\t\t\tborder-left: none;\n" +"\t\t\t\tborder-right: none;\n" +"\t\t\t}\n" +"\t\t\t\n" +"\t\t\ttable td {\n" +"\t\t\t\tborder-left: none;\n" +"\t\t\t\tborder-right: none;\n" +"\t\t\t\tborder-top: 1px solid #d4d4d4;\n" +"\t\t\t\tfont-size: 13px;\n" +"\t\t\t}\n" +"\t\t</style>\n" +"\t\t<div class=\"header\" style=\"text-align: right;padding-top: 10px;padding-right: 40px;padding-bottom: 40px;\">\n" +"\t\t\t<img style=\"width: 137.75px;height: 48.25px;\" src=\"https://www.focus-base.com/files/pdfimg/lecoff_logo.png\" alt=\"\" class=\"logo\" />\n" +"\t\t</div>\n" +"\t\t<div class=\"scheme\" style=\"padding: 0 50px;\">\n" +"\t\t\t<h3 style=\"font-size: 24px;line-height: 1;\">#planName#</h3>\n" +"\t\t\t<br/>\n" +"\t\t\t<div class=\"scheme-content\">\n" +"\t\t\t\t<table border=\"2\" style=\"border-collapse: collapse;width: 100%;\">\n" +"\t\t\t\t\t<tbody>\n" +"\t\t\t\t\t\t<tr style=\"height: 40px;\">\n" +"\t\t\t\t\t\t\t<td style=\"text-align: center;\"><b>套餐类型</b></td>\n" +"\t\t\t\t\t\t\t<td style=\"text-align: center;\"> <b>套餐明细</b></td>\n" +"\t\t\t\t\t\t\t<td style=\"text-align: center;\"><b>费用</b></td>\n" +"\t\t\t\t\t\t\t<td style=\"text-align: center;\"><b>数量</b></td>\n" +"\t\t\t\t\t\t</tr>\n" +"\t\t\t\t\t\t<tr>\n" +"\t\t\t\t\t\t\t<td style=\"text-align: center;padding: 10px 0;\">\n" +"\t\t\t\t\t\t\t\t<img style=\"width: 100px;height: 100px;\" src=\"https://cdn.focus-base.com/pic/2547795500040808.jpg\" alt=\"\" />\n" +"\t\t\t\t\t\t\t\t<div style=\"padding-top: 10px;\">#mealName#</div>\n" +"\t\t\t\t\t\t\t</td>\n" +"\t\t\t\t\t\t\t<td style=\"padding: 10px 0;\">\n" +"\t\t\t\t\t\t\t\t#mealDetail#\n" +"\t\t\t\t\t\t\t</td>\n" +"\t\t\t\t\t\t\t<td style=\"text-align: center;\">#mealPrice#元/月（套）</td>\n" +"\t\t\t\t\t\t\t<td style=\"text-align: center;\">#mealAmount#</td>\n" +"\t\t\t\t\t\t</tr>\n" +"\t\t\t\t\t\t<tr>\n" +"\t\t\t\t\t\t\t<td style=\"text-align: center;\">#packageName#</td>\n" +"\t\t\t\t\t\t\t<td class=\"t-l\" style=\"padding: 10px 0;\">\n" +"\t\t\t\t\t\t\t\t#packageDetail#\n" +"\t\t\t\t\t\t\t</td>\n" +"\t\t\t\t\t\t\t<td style=\"text-align: center;\">#packagePrice#元/包</td>\n" +"\t\t\t\t\t\t\t<td style=\"text-align: center;\">#packageAmount#</td>\n" +"\t\t\t\t\t\t</tr>\n" +"\t\t\t\t\t\t<tr>\n" +"\t\t\t\t\t\t\t<td style=\"text-align: right;padding: 10px 0;\" colspan=\"4\">\n" +"\t\t\t\t\t\t\t\t<div style=\"font-weight: bold;font-size: 16px;line-height: 1;\"><b>合计：#total#元</b></div>\n" +"\t\t\t\t\t\t\t</td>\n" +"\t\t\t\t\t\t</tr>\n" +"\t\t\t\t\t</tbody>\n" +"\t\t\t\t</table>\n" +"\t\t\t</div>\n" +"\t\t</div>\n" +"\t</body>";public static void main(String[] args) throws Exception {System.out.println("hehehe");List<String>htmlList = new ArrayList<>();htmlList.add(pageTable);htmlToPDFPage(htmlList, "D:\\F\\down\\html2Pdf.pdf");System.out.println("hehehe");}}

将生成的pdf和，html在浏览器的效果相比较的话，table的效果差距还是比较明显的

3 pdf转图片，试了好几版，发现这版效果比较满意。当然，图片是针对pdf的每一页的内容生成。

package org.springblade.modules.lecoffee.utils;import org.icepdf.core.pobjects.Document;
import org.icepdf.core.util.GraphicsRenderingHints;import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;public class PDFToImage {public static void pdf2Pic(String pdfPath, String path, String fileName) throws Exception {Document document = new Document();document.setFile(pdfPath);//缩放比例float scale = 2.5f;//旋转角度float rotation = 0f;for (int i = 0; i < document.getNumberOfPages(); i++) {BufferedImage image = (BufferedImage)document.getPageImage(i, GraphicsRenderingHints.SCREEN, org.icepdf.core.pobjects.Page.BOUNDARY_CROPBOX, rotation, scale);RenderedImage rendImage = image;try {File fileDir = new File(path);if (!fileDir.exists()) {fileDir.mkdirs();}String imgName = fileName + i + ".png";File file = new File(path + imgName);ImageIO.write(rendImage, "png", file);} catch (IOException e) {e.printStackTrace();}image.flush();}document.dispose();}public static void main(String[] args) throws Exception {String filePath = "D:\\F\\down\\demo.pdf";pdf2Pic(filePath, "D:\\F\\down\\demo\\", "12857584447386337291_");}
}

结果:

生成的效果还不错

4 关于乱码：

通过ItemxtPdf生成pdf和用pdf转img这两步，对于中文有时候会出现乱码。一般是由于代码的字体在系统找不到导致的，

linux系统下字体会放在/usr/share/fonts 这个目录下。如果目录不存在，一般需要重新安装下字体；

yum -y install fontconfig  #安装字体库:
fc-cache -fv  #刷新字体库，使新添加、安装的字体生效

windows系统的话，字体一般在这个文件夹下 C:\Windows\Fonts

5 自定义字体

如果想自定义字体，可以先把相应的字体文件放置到对应的目录下调用即可。需要修改下获取字体的代码

    public static Font getPdfChineseFontNew(int size) throws Exception {//默认linux字体位置String fontUrl = "/usr/share/fonts" + File.separator + "SimHei.ttf";//获取系统类型String os = System.getProperties().getProperty("os.name");if (os.startsWith("win") || os.startsWith("Win")) {fontUrl = "C:\\Windows\\Fonts" + File.separator + "SimHei.ttf";}BaseFont baseFont;try {baseFont = BaseFont.createFont(fontUrl, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);} catch (Exception e) {//默认宋体e.printStackTrace();baseFont = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);}return new Font(baseFont, size, Font.NORMAL, BaseColor.BLACK);}

itextpdf生成pdf,html转pdf,pdf转图片

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