spring-boot中怎么实现一个PDF打印功能

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1.导入jar（一定要注意版本，踩过很多坑）

<!--pdf依赖-->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itextpdf</artifactId>
            <version>5.5.1</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.itextpdf/itext-asian -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itext-asian</artifactId>
            <version>5.2.0</version>
        </dependency>

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)
 **/
@Log4j2
public 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<String, Object> tittle, List<Object> listObj, Map<String, Object> pojectMap, String language) throws IOException, DocumentException {
        File file = null;
        try {

            String tmpDir = SungwsConfig.INSTANCE.getConfig().get("tmp.dir");//临时文件夹
            File tmpDirFile = new File(tmpDir);
            if (!tmpDirFile.exists()) {
                tmpDirFile.mkdir();
            }
            String fileName = UUIDUtil.getRandomStringByLength(6).toUpperCase();
            String fileUrl = tmpDir + File.separator + fileName + ".pdf";
            file = new File(fileUrl);
//            file.createNewFile();

            initDocument(file);

            PdfPTable table = createTable(tittle, listObj, pojectMap, language);
            document.add(table);
            System.out.println("文件创建成功: " + fileUrl);
            return fileUrl;
        } finally {
            if (document != null) {
                document.close();
            }

        }

    }

    /**
     * 组装table
     *
     * @param tittle
     * @param listObj
     * @param pojectMap
     * @param language
     * @return
     */
    private static PdfPTable createTable(Map<String, Object> tittle, List<Object> listObj, Map<String, Object> pojectMap, String language) {

        System.out.println("tittle" + tittle);
        System.out.println("listObj" + listObj);

        AtomicInteger index = new AtomicInteger(1);//记录下表数
        AtomicInteger allColsSize = new AtomicInteger(0);//记录总列数
        float width = 100;
        float height = 40;
        int tittleSize = tittle.size();

        PdfPTable table = createTable(tittleSize);

        //1 设置标题
        tittle.forEach((key, value) -> {
            PdfPCell cell = null; //表格的单元格
            if ("zh".equals(language)) {
                cell = createHeadCell(String.valueOf(value), textfont);
            } else {
                cell = createHeadCell(key, textfont);
            }
            table.addCell(cell);
            allColsSize.getAndIncrement();
        });


        //2 设置 内容
        listObj.forEach(obj -> {
            if (obj instanceof List) {
                List<Map> comptents = (List<Map>) obj;
                comptents.forEach(comptent -> {

                    Object obj1 = comptent.get("parts");
                    AtomicInteger rowSpan1 = new AtomicInteger(0);
                    List<Map> parts = null;

                    if (obj1 instanceof List && ((List) obj1).size() > 0) {
                        //rowSpan1 需要嵌套多层
                        parts = (List<Map>) obj1;
                        parts.forEach(part -> {
                            Object obj2 = part.get("items");
                            if (obj2 instanceof List && ((List) obj2).size() > 0) {
                                rowSpan1.addAndGet(((List) obj2).size());
                            } else {
                                rowSpan1.addAndGet(1);
                            }
                        });
                    } else {
                        rowSpan1.addAndGet(1);
                    }

                    //添加编号
                    PdfPCell cellNo = createCell(String.valueOf(index.getAndIncrement()), textfont, rowSpan1.get(), 1);
                    table.addCell(cellNo);

                    //组件
                    String component_name = String.valueOf(comptent.get("component_name"));
                    PdfPCell cell1 = createCell(component_name, textfont, rowSpan1.get(), 1);
                    table.addCell(cell1);


                    if (parts != null) {
                        //部件
                        parts.forEach(part -> {
                            Object obj2 = part.get("items");
                            List<Map> items = null;
                            int rowSpan2 = 1;

                            if (obj2 instanceof List && ((List) obj2).size() > 0) {
                                items = (List<Map>) obj2;
                                rowSpan2 = items.size();
                            }

                            //部件Custmization
                            String part_name = String.valueOf(part.get("part_name"));
                            PdfPCell cell2 = createCell(part_name, textfont, rowSpan2, 1);
                            table.addCell(cell2);

                            if (items != null) {
                                //item
                                items.forEach(item -> {

                                    //从标题的第三个key开始遍历titile,获取数据
                                    Set<String> keys = tittle.keySet();
                                    Iterator<String> iterator = keys.iterator();
                                    iterator.next();//排除第一个NO
                                    iterator.next();//排除第二个Components
                                    iterator.next();//排除第三个Items
                                    while (iterator.hasNext()) {
                                        String key = iterator.next();
                                        Object o = item.get(key);

                                        if (o != null) {
                                            PdfPCell cell3 = createCell(String.valueOf(o), textfont, 1, 1);
                                            table.addCell(cell3);
                                        } else {
                                            table.addCell(createBlankTable());
                                        }
                                    }
                                });
                            } else {
                                //剩下的列没有数据填空
                                for (int i = 0; i < allColsSize.get() - 3; i++) {
                                    table.addCell(createBlankTable());
                                }
                            }

                        });
                    } else {
                        //剩下的列没有数据填空
                        for (int i = 0; i < allColsSize.get() - 2; i++) {
                            table.addCell(createBlankTable());
                        }
                    }
                });
            }
        });

        //3 设置消费者信息
//        table.addCell(createCell("", textfont, 1, allColsSize.get()));//中间空一行

        //添加编号
        PdfPCell cellNo = createCell(String.valueOf(index.getAndIncrement()), textfont, 10, 1);
        table.addCell(cellNo);

        Map<String, Object> projectTitle = (Map<String, Object>) pojectMap.get("projectTitle");//标题
        Map<String, Object> projectValue = (Map<String, Object>) pojectMap.get("projectValue");//值

        //项目概述
        table.addCell(createCell(String.valueOf(pojectMap.get("component_name")), textfont, 1, 1));
        table.addCell(createCell(String.valueOf(projectTitle.get("components_name")), textfont, 1, 1));
        table.addCell(createCell(String.valueOf(projectValue.get("components_name")), textfont, 1, allColsSize.get() - 3));


        table.addCell(createCell(String.valueOf(pojectMap.get("customer_inputs")), textfont, 9, 1));
        table.addCell(createCell(String.valueOf(projectTitle.get("components_location")), textfont, 1, 1));
        table.addCell(createCell(String.valueOf(projectValue.get("components_location")), textfont, 1, allColsSize.get() - 3));
        table.addCell(createCell(String.valueOf(projectTitle.get("plant_capacity")), textfont, 1, 1));
        table.addCell(createCell(String.valueOf(projectValue.get("plant_capacity")), textfont, 1, allColsSize.get() - 3));
        table.addCell(createCell(String.valueOf(projectTitle.get("site_conditions")), textfont, 1, 1));
        table.addCell(createCell(String.valueOf(projectValue.get("site_conditions")), textfont, 1, allColsSize.get() - 3));
        table.addCell(createCell(String.valueOf(projectTitle.get("altitude")), textfont, 1, 1));
        table.addCell(createCell(String.valueOf(projectValue.get("altitude")), textfont, 1, allColsSize.get() - 3));
        table.addCell(createCell(String.valueOf(projectTitle.get("dc_ac_ratio")), textfont, 1, 1));
        table.addCell(createCell(String.valueOf(projectValue.get("dc_ac_ratio")), textfont, 1, allColsSize.get() - 3));
        table.addCell(createCell(String.valueOf(projectTitle.get("inverter_dc_input_cable")), textfont, 1, 1));
        table.addCell(createCell(String.valueOf(projectValue.get("inverter_dc_input_cable")), textfont, 1, allColsSize.get() - 3));
        table.addCell(createCell(String.valueOf(projectTitle.get("mv_switchgear_output_cable")), textfont, 1, 1));
        table.addCell(createCell(String.valueOf(projectValue.get("mv_switchgear_output_cable")), textfont, 1, allColsSize.get() - 3));
        table.addCell(createCell(String.valueOf(projectTitle.get("grid_voltage")), textfont, 1, 1));
        table.addCell(createCell(String.valueOf(projectValue.get("grid_voltage")), textfont, 1, allColsSize.get() - 3));

        return table;
    }
}

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