itext生成pdf

最新推荐文章于 2025-04-14 11:07:05 发布

你就是个野指针

最新推荐文章于 2025-04-14 11:07:05 发布

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文章标签： pdf java 服务器

本文链接：https://blog.youkuaiyun.com/qq_58278529/article/details/143070862

版权

itext生成pdf需要引用的依赖

        <!-- itext7html转pdf  -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>html2pdf</artifactId>
            <version>3.0.2</version>
        </dependency>
        <!-- 中文字体支持 -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>font-asian</artifactId>
            <version>7.1.13</version>
        </dependency>

上代码创建 WaterMarkEventHandler 千万别导错包了我就是导入错误的包卡了好久

package com.warn.platform.util;

import com.itextpdf.kernel.colors.WebColors;
import com.itextpdf.kernel.events.Event;
import com.itextpdf.kernel.events.IEventHandler;
import com.itextpdf.kernel.events.PdfDocumentEvent;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.Canvas;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.property.TextAlignment;
import com.itextpdf.layout.property.VerticalAlignment;

import java.io.IOException;

/**
 * 水印
 */
public class WaterMarkEventHandler implements IEventHandler {
 
    /**
     * 水印内容
     */
    private String waterMarkContent;
 
    /**
     * 一页中有几列水印
     */
    private int waterMarkX;
 
    /**
     * 一页中每列有多少水印
     */
    private int waterMarkY;
 
    public WaterMarkEventHandler(String waterMarkContent) {
        this(waterMarkContent, 5, 5);
    }
 
    public WaterMarkEventHandler(String waterMarkContent, int waterMarkX, int waterMarkY) {
        this.waterMarkContent = waterMarkContent;
        this.waterMarkX = waterMarkX;
        this.waterMarkY = waterMarkY;
    }
 
    @Override
    public void handleEvent(Event event) {
 
        PdfDocumentEvent documentEvent = (PdfDocumentEvent) event;
        PdfDocument document = documentEvent.getDocument();
        PdfPage page = documentEvent.getPage();
        Rectangle pageSize = page.getPageSize();
 
        PdfFont pdfFont = null;
        try {
            pdfFont = PdfFontFactory.createFont("STSongStd-Light", "UniGB-UCS2-H", false);
        } catch (IOException e) {
            e.printStackTrace();
        }
 
        PdfCanvas pdfCanvas = new PdfCanvas(page.newContentStreamAfter(), page.getResources(), document);
 
        Paragraph waterMark = new Paragraph(waterMarkContent).setOpacity(0.5f);
        Canvas canvas = new Canvas(pdfCanvas, pageSize)
            .setFontColor(WebColors.getRGBColor("lightgray"))
            .setFontSize(16)
            .setFont(pdfFont);
 
        for (int i = 0; i < waterMarkX; i++) {
            for (int j = 0; j < waterMarkY; j++) {
                canvas.showTextAligned(waterMark, (150 + i * 300), (160 + j * 150), document.getNumberOfPages(), TextAlignment.CENTER, VerticalAlignment.BOTTOM, 120);
            }
        }
        canvas.close();
    }
}

package com.warn.platform.util;

import com.itextpdf.kernel.events.Event;
import com.itextpdf.kernel.events.IEventHandler;
import com.itextpdf.kernel.events.PdfDocumentEvent;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.Canvas;
import com.itextpdf.layout.property.TextAlignment;


import java.io.IOException;

/**
 * 页码
 */
public class PageEventHandler implements IEventHandler {
 
    @Override
    public void handleEvent(Event event) {
        PdfDocumentEvent documentEvent = (PdfDocumentEvent) event;
        PdfDocument document = documentEvent.getDocument();
        PdfPage page = documentEvent.getPage();
        Rectangle pageSize = page.getPageSize();
 
        PdfFont pdfFont = null;
        try {
            pdfFont = PdfFontFactory.createFont("STSongStd-Light", "UniGB-UCS2-H", false);
        } catch (IOException e) {
            e.printStackTrace();
        }
 
        PdfCanvas pdfCanvas = new PdfCanvas(page.getLastContentStream(), page.getResources(), document);
        Canvas canvas = new Canvas(pdfCanvas, pageSize);
        float  x = (pageSize.getLeft() + pageSize.getRight()) / 2;
        float  y = pageSize.getBottom() + 15;
        Paragraph paragraph = new Paragraph("第" + document.getPageNumber(page) + "页/共" + document.getNumberOfPages() + "页")
            .setFontSize(10)
            .setFont(pdfFont);
        canvas.showTextAligned(paragraph, x, y, TextAlignment.CENTER);
        canvas.close();
    }
}

package com.warn.platform.util;

import com.itextpdf.html2pdf.ConverterProperties;
import com.itextpdf.html2pdf.HtmlConverter;
import com.itextpdf.io.font.PdfEncodings;
import com.itextpdf.kernel.events.PdfDocumentEvent;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.geom.PageSize;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.layout.font.FontProvider;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;

import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Itext7转换工具类
 */
@Slf4j
public class HtmlToPdfUtils {
 
    /**
     * html转pdf
     *
     * @param inputStream  输入流
     * @param waterMark    水印
     * @param fontPath     字体路径，ttc后缀的字体需要添加<b>,0<b/>
     * @param outputStream 输出流
     * @date : 2022/11/15 14:07
     */
    public static void convertToPdf(InputStream inputStream, String waterMark, String fontPath, OutputStream outputStream) throws IOException, IOException {
 
        PdfWriter pdfWriter = new PdfWriter(outputStream);
        PdfDocument pdfDocument = new PdfDocument(pdfWriter);
        //设置为A4大小
        pdfDocument.setDefaultPageSize(PageSize.A4);
        //添加水印
        pdfDocument.addEventHandler(PdfDocumentEvent.END_PAGE, new WaterMarkEventHandler(waterMark));
 
        //添加中文字体支持
        ConverterProperties properties = new ConverterProperties();
        FontProvider fontProvider = new FontProvider();
 
        //        设置字体
        /*PdfFont sysFont = PdfFontFactory.createFont("STSongStd-Light", "UniGB-UCS2-H", false);
        fontProvider.addFont(sysFont.getFontProgram(), "UniGB-UCS2-H");*/
 
        //添加自定义字体，例如微软雅黑
        if (StringUtils.isNotBlank(fontPath)) {
            PdfFont microsoft = PdfFontFactory.createFont(fontPath, PdfEncodings.IDENTITY_H, false);
            fontProvider.addFont(microsoft.getFontProgram(), PdfEncodings.IDENTITY_H);
        }
 
        properties.setFontProvider(fontProvider);
        //        读取Html文件流，查找出当中的&nbsp;或出现类似的符号空格字符
        inputStream = readInputStrem(inputStream);
        if (inputStream != null) {
            //        生成pdf文档
            HtmlConverter.convertToPdf(inputStream, pdfDocument, properties);
            pdfWriter.close();
            pdfDocument.close();
            return;
        } else {
            log.error("转换失败！");
        }
    }
 
    /**
     * 读取HTML 流文件，并查询当中的&nbsp;或类似符号直接替换为空格
     *
     * @param inputStream
     * @return
     */
    private static InputStream readInputStrem(InputStream inputStream) {
        // 定义一些特殊字符的正则表达式 如：
        String regEx_special = "\\&[a-zA-Z]{1,10};";
        try {
            //<1>创建字节数组输出流，用来输出读取到的内容
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            //<2>创建缓存大小
            byte[] buffer = new byte[1024]; // 1KB
            //每次读取到内容的长度
            int len = -1;
            //<3>开始读取输入流中的内容
            while ((len = inputStream.read(buffer)) != -1) { //当等于-1说明没有数据可以读取了
                baos.write(buffer, 0, len);   //把读取到的内容写到输出流中
            }
            //<4> 把字节数组转换为字符串
            String content = baos.toString();
            //<5>关闭输入流和输出流
            //            inputStream.close();
            baos.close();
            //            log.info("读取的内容：{}", content);
            //            判断HTML内容是否具有HTML的特殊字符标记
            Pattern compile = Pattern.compile(regEx_special, Pattern.CASE_INSENSITIVE);
            Matcher matcher = compile.matcher(content);
            String replaceAll = matcher.replaceAll("");
            //            log.info("替换后的内容：{}", replaceAll);
            //            将字符串转化为输入流返回
            InputStream stringStream = getStringStream(replaceAll);
            //<6>返回结果
            return stringStream;
        } catch (Exception e) {
            e.printStackTrace();
            log.error("错误信息：{}", e.getMessage());
            return null;
        }
    }
 
    /**
     * 将一个字符串转化为输入流
     * @param sInputString 字符串
     * @return
     */
    public static InputStream getStringStream(String sInputString) {
        if (sInputString != null && !sInputString.trim().equals("")) {
            try {
                ByteArrayInputStream tInputStringStream = new ByteArrayInputStream(sInputString.getBytes());
                return tInputStringStream;
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return null;
    }
 
}

工具类创建完成接下来就是测试

public void downloadPdfTray(@RequestBody List<Map<String, Object>> rows) throws ParseException, IOException {
            // 我这里是将前端代码通过富文本编辑框存入后端数库中根据id查询到模板内容然后替换
            //查模板
            TbPrintTemplate tbPrintTemplate = tbPrintTemplateService.selectByTempId(tempId);
            StringBuffer sf = new StringBuffer();
            sf.append(tbPrintTemplate.getContent());
            //替换模板中指定数据
            String printData = purchaseOrderShipmentDetailService.initPrintData(sf.toString(), id.toString());
            // 将模板中的数据补充完整 这一段可以放进浏览器中查看了
            printData = "<!DOCTYPE html>\n" +
                            "<html lang=\"en\">\n" +
                            "<head>\n" +
                            "    <meta charset=\"UTF-8\">\n" +
                            "    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n" +
                            "    <title>Document</title>\n" +
                            "</head>\n" +
                            "<body>\n" +
                            printData+
                            "</body>\n" +
                            "</html>";
            // 将html代码转换为流方便后续使用
            byte[] bytes = printData.getBytes();
            InputStream inputStream = new ByteArrayInputStream(bytes);
            //pdf文件存储相对路径
            String pdfFile = "D:/along/output.pdf";
            //自定义水印 没有水印
            String waterMarkText =  "";

            OutputStream outputStream = new FileOutputStream(pdfFile);
            //这个是字体文件路径 是window中的字体文件可以自己选择 一般都存C:/WINDOWS/Fonts路径下
            String fontPath = "C:/WINDOWS/Fonts/simsun.ttc,0";
            HtmlToPdfUtils.convertToPdf(inputStream, waterMarkText, fontPath, outputStream);
}