Java：iText生成pdf文档

依赖

    com.itextpdf
    itextpdf
    5.5.11


    com.itextpdf.tool
    xmlworker
    5.5.11



    com.itextpdf
    itext-asian
    5.2.0



    org.xhtmlrenderer
    flying-saucer-pdf-itext5
    9.1.16



    net.sf.jtidy
    jtidy
    r938

使用示例 1、简单使用

package com.pengshiyu;

import com.itextpdf.text.Document;
import com.itextpdf.text.Font;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfWriter;

import java.io.FileOutputStream;

/**
 * Hello world!
 */
public class PdfDemo {
    public static void main(String[] args) throws Exception {
		// 新建文档
        Document document = new Document(PageSize.A4);

        // 如果输出中文，需要设置中文字体
        BaseFont chineseFont = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
        Font font = new Font(chineseFont, 12, Font.NORMAL);

        PdfWriter.getInstance(document, new FileOutputStream("hello.pdf"));

        // 打开文档
        document.open();
        // 写入内容
        Paragraph paragraph = new Paragraph("hello world 你好世界", font);
        document.add(paragraph);
        // 关闭文档
        document.close();
    }
}

2、稍复杂的示例

package com.pengshiyu;

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.pdf.codec.Base64;
import com.itextpdf.tool.xml.XMLWorker;
import com.itextpdf.tool.xml.XMLWorkerFontProvider;
import com.itextpdf.tool.xml.css.StyleAttrCSSResolver;
import com.itextpdf.tool.xml.html.CssAppliers;
import com.itextpdf.tool.xml.html.CssAppliersImpl;
import com.itextpdf.tool.xml.html.Tags;
import com.itextpdf.tool.xml.parser.XMLParser;
import com.itextpdf.tool.xml.pipeline.css.CSSResolver;
import com.itextpdf.tool.xml.pipeline.css.CssResolverPipeline;
import com.itextpdf.tool.xml.pipeline.end.PdfWriterPipeline;
import com.itextpdf.tool.xml.pipeline.html.AbstractImageProvider;
import com.itextpdf.tool.xml.pipeline.html.HtmlPipeline;
import com.itextpdf.tool.xml.pipeline.html.HtmlPipelineContext;

import java.io.*;


public class App {


    /**
     * 创建PDF文件
     *
     * @param htmlStr
     * @throws Exception
     */
    private static void writeToOutputStreamAsPDF(String htmlStr) throws Exception {
        String targetFile = "pdfDemo.pdf";
        File targeFile = new File(targetFile);
        if (targeFile.exists()) {
            targeFile.delete();
        }

        //定义pdf文件尺寸，采用A4横切
        Document document = new Document(PageSize.A4, 25, 25, 15, 40);// 左、右、上、下间距
        //定义输出路径
        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(targetFile));
        // PdfReportHeaderFooter header = new PdfReportHeaderFooter("", 8, PageSize.A4);
        // writer.setPageEvent(header);
        writer.addViewerPreference(PdfName.PRINTSCALING, PdfName.NONE);
        document.open();

        // CSS
        CSSResolver cssResolver = new StyleAttrCSSResolver();
        CssAppliers cssAppliers = new CssAppliersImpl(new XMLWorkerFontProvider() {

            @Override
            public Font getFont(String fontname, String encoding, boolean embedded, float size, int style, BaseColor color) {
                try {
                    //用于中文显示的Provider
                    BaseFont bfChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
                    return new Font(bfChinese, size, style);
                } catch (Exception e) {
                    return super.getFont(fontname, encoding, size, style);
                }
            }
        });

        //html
        HtmlPipelineContext htmlContext = new HtmlPipelineContext(cssAppliers);
        htmlContext.setTagFactory(Tags.getHtmlTagProcessorFactory());
        htmlContext.setImageProvider(new AbstractImageProvider() {
            @Override
            public Image retrieve(String src) {
                //支持图片显示
                int pos = src.indexOf("base64,");
                try {
                    if (src.startsWith("data") && pos > 0) {
                        byte[] img = Base64.decode(src.substring(pos + 7));
                        return Image.getInstance(img);
                    } else if (src.startsWith("http")) {
                        return Image.getInstance(src);
                    }
                } catch (BadElementException ex) {
                    return null;
                } catch (IOException ex) {
                    return null;
                }
                return null;
            }

            @Override
            public String getImageRootPath() {
                return null;
            }
        });


        // Pipelines
        PdfWriterPipeline pdf = new PdfWriterPipeline(document, writer);
        HtmlPipeline html = new HtmlPipeline(htmlContext, pdf);
        CssResolverPipeline css = new CssResolverPipeline(cssResolver, html);

        // XML Worker
        XMLWorker worker = new XMLWorker(css, true);
        XMLParser p = new XMLParser(worker);
        p.parse(new ByteArrayInputStream(htmlStr.getBytes()));

        document.close();
    }

    /**
     * 读取 HTML 文件
     *
     * @return
     */
    private static String readHtmlFile() {
        StringBuffer textHtml = new StringBuffer();
        try {
            File file = new File("printDemo.html");
            BufferedReader reader = new BufferedReader(new FileReader(file));
            String tempString = null;
            // 一次读入一行，直到读入null为文件结束
            while ((tempString = reader.readLine()) != null) {
                textHtml.append(tempString);
            }
            reader.close();
        } catch (IOException e) {
            return null;
        }
        return textHtml.toString();
    }

    public static void main(String[] args) throws Exception {
        // 读取html文件
        String htmlStr = readHtmlFile();
        // 将html文件转成PDF
        writeToOutputStreamAsPDF(htmlStr);
    }

}

出库单

    
        
            
            
                入库单
                
                    
                
            
            
                操作人：xxx
                创建时间：2021-09-14 12:00:00
            
            
        
    
    
    
        
            
                序号
                商品
                单位
                数量
            
            
                1
                xxx沐浴露
                箱
                3
            
            
                2
                xxx洗发水
                箱
                4
            
            
                3
                xxx洗衣粉
                箱
                5
            
            
                4
                xxx洗面奶
                箱
                5
            
        
    

参考 手把手教你使用Java开发在线生成pdf文档