spring-boot中怎么实现一个PDF打印功能

这篇文章将为大家详细讲解有关spring-boot中怎么实现一个PDF打印功能，文章内容质量较高，因此小编分享给大家做个参考，希望大家阅读完这篇文章后对相关知识有一定的了解。

1.导入jar（一定要注意版本，踩过很多坑）

                    com.itextpdf            itextpdf            5.5.1                                    com.itextpdf            itext-asian            5.2.0        

2.工具类

package com.sungrow.sgframe.api.isolarapi.machineconfigservice.util;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 lombok.extern.log4j.Log4j2;import org.sg.tools.config.SungwsConfig;import org.sg.tools.util.UUIDUtil;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.Set;import java.util.concurrent.atomic.AtomicInteger;/** * @author shihaifeng * @date 2019-09-29 11:03 * @desc (PDF工具类) **/@Log4j2public class PDFUtil {    private static Document document = null;// 建立一个Document对象    private static int maxWidth = 520;    private static Font headfont;// 设置字体大小    private static Font keyfont;// 设置字体大小    private static Font textfont;// 设置字体大小    static {        BaseFont bfChinese;        try {            bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);            headfont = new Font(bfChinese, 10, Font.BOLD);// 设置字体大小            keyfont = new Font(bfChinese, 8, Font.BOLD);// 设置字体大小            textfont = new Font(bfChinese, 8, Font.NORMAL);// 设置字体大小        } catch (Exception e) {            e.printStackTrace();            log.error(e.getMessage(), e);        }    }    /**     * 初始化文档     */    private static void initDocument(File file) {        document = new Document();//每一次初始化一个document 不然会有问题 open()方法有问题        document.setPageSize(PageSize.A4);// 设置页面大小        try {            FileOutputStream fileOutputStream = new FileOutputStream(file);            PdfWriter.getInstance(document, fileOutputStream)                    .setViewerPreferences(PdfWriter.PageModeUseThumbs);            document.open();        } catch (Exception e) {            e.printStackTrace();            log.error(e.getMessage(), e);        }    }    /**     * 创建table     *     * @param colNumber     * @return     */    private static PdfPTable createTable(int colNumber) {        PdfPTable table = new PdfPTable(colNumber);        try {            table.setTotalWidth(maxWidth);            table.setLockedWidth(true);            table.setHorizontalAlignment(Element.ALIGN_CENTER);            table.getDefaultCell().setBorder(1);        } catch (Exception e) {            e.printStackTrace();            log.error(e.getMessage(), e);        }        return table;    }    /**     * 创建table     *     * @param widths     * @return     */    private PdfPTable createTable(float[] widths) {        PdfPTable table = new PdfPTable(widths);        try {            table.setTotalWidth(maxWidth);            table.setLockedWidth(true);            table.setHorizontalAlignment(Element.ALIGN_CENTER);            table.getDefaultCell().setBorder(1);        } catch (Exception e) {            e.printStackTrace();            log.error(e.getMessage(), e);        }        return table;    }    /**     * 创建 空table     *     * @return     */    private static PdfPCell createBlankTable() {        PdfPCell cell = new PdfPCell();        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);        cell.setHorizontalAlignment(Element.ALIGN_CENTER);        Paragraph paragraph = new Paragraph("", getPdfChineseFont());        cell.setPhrase(paragraph);        return cell;    }    /**     * 创建列     *     * @param value     * @param font     * @param align     * @return     */    private PdfPCell createCell(String value, Font font, int align) {        PdfPCell cell = new PdfPCell();        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);        cell.setHorizontalAlignment(align);        Paragraph paragraph = new Paragraph(String.valueOf(value), getPdfChineseFont());        cell.setPhrase(paragraph);        return cell;    }    /**     * 创建列     *     * @param value     * @param font     * @return     */    private static PdfPCell createHeadCell(String value, Font font) {        PdfPCell cell = new PdfPCell();        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);        cell.setHorizontalAlignment(Element.ALIGN_CENTER);        cell.setBackgroundColor(new BaseColor(22022022));        cell.setFixedHeight(25.0f);        Font headFont = getPdfChineseFont();        headFont.setColor(new BaseColor(0xff0000));        headFont.setSize(14);        headFont.setStyle("bold");        Paragraph paragraph = new Paragraph(String.valueOf(value), headFont);        cell.setPhrase(paragraph);        return cell;    }    /**     * 创建列     *     * @param value     * @param font     * @param rowSpan 占多列     * @param colspan 占多行     * @return     */    private static PdfPCell createCell(String value, Font font, int rowSpan, int colspan) {        PdfPCell cell = new PdfPCell();        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);        cell.setHorizontalAlignment(Element.ALIGN_CENTER);        cell.setRowspan(rowSpan);        cell.setColspan(colspan);        Paragraph paragraph = new Paragraph(String.valueOf(value), getPdfChineseFont());        cell.setPhrase(paragraph);        return cell;    }    /**     * 创建列     *     * @param value     * @param font     * @param align     * @param colspan     * @param boderFlag     * @return     */    private static PdfPCell createCell(String value, Font font, int align, int colspan, boolean boderFlag) {        PdfPCell cell = new PdfPCell();        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);        cell.setHorizontalAlignment(align);        cell.setColspan(colspan);        Paragraph paragraph = new Paragraph(String.valueOf(value), getPdfChineseFont());        cell.setPhrase(paragraph);        cell.setPadding(3.0f);        if (!boderFlag) {            cell.setBorder(0);            cell.setPaddingTop(15.0f);            cell.setPaddingBottom(8.0f);        }        return cell;    }    /**     * 增加中文显示     *     * @return     */    private static Font getPdfChineseFont() {        BaseFont bfChinese = null;        try {            bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);        } catch (DocumentException e) {            e.printStackTrace();            log.error(e.getMessage(), e);        } catch (IOException e) {            e.printStackTrace();            log.error(e.getMessage(), e);        }        Font fontChinese = new Font(bfChinese, 12, Font.NORMAL);        return fontChinese;    }    /**     * 创建pdf     */    public static String createPDF(Map tittle, List