java 生成pdf自动合并单元格 上下 左右合并,插入图片,多个pdf进行合并

		    com.itextpdf
		    itextpdf
		    ${itextpdf.version}
		    
                
                    org.junit.jupiter
                    junit-jupiter-api
                
            
		
		
		    com.itextpdf
		    itext-asian
		    5.2.0
		

我下面代码中imgurl是base64编码,让后转的图片,你们使用的话,直接替换成图片路径地址就可以了

headList参数表示表格头部需要合并的集合,如果相邻左右或者上下位置的内容相同,就会自动合并单元格

        List> headList = new ArrayList<>();
        headList.add(Arrays.asList(new String[]{"1","2","2","3","3","4","4","5"}));
        headList.add(Arrays.asList(new String[]{"1","6","7","8","9","10","11","5"}));
        headList.add(Arrays.asList(new String[]{"1","12","13","14","15","16","17","5"}));

dataList参数表示表格下方的数据集合,会根据headList中第一行的长度进行自动换行,传入 dataList参数的长度只要是headList(0)的长度的倍数即可.

其余的一些参数是我项目中使用到的,你们看着删一删就行了.

这里面自带 合并pdf功能,两次调用方法如果传入的文件名相同的话就会合并成一个

package com.runstone.rsflow.pdf;

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;
import com.runstone.system.util.ConstantParam;
import org.apache.commons.lang.StringUtils;
import org.apache.logging.log4j.Logger;
import sun.misc.BASE64Decoder;

import java.io.*;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.List;

/**
 * 导出pdf
 */
public class PdfExport {
    /**
     *
     * @param title  pdf的标题
     * @param imgUrl 图片路径  例:d:/echarts1.png
     * @param filePath  要保存pdf的路径  例:d:/
     * @param fileName  pdf的文件名   例:1.pdf
     * @param headList  表格头部的list数据
     * @param dataList  表格下方的内容数据   按顺序填入集合中即可
     * @param log
     */
    public static void makePdf(List title,List imgUrl,String filePath,String fileName, List> headList, List dataList,String note, Logger log){
        fileName = fileName.replaceAll("/", "");
        fileName = fileName.replaceAll("\\\\","");
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
        String format = simpleDateFormat.format(new Date());
        filePath += format+File.separator;
        String imgName = filePath+UUID.randomUUID().toString()+".png";
        File f = new File(filePath);
        OutputStream out = null;
        FileOutputStream fileOutputStream = null;
        if (!f.exists()){
            f.mkdirs();
        }

        File file = new File(filePath+fileName);

        String[] pdfs = new String[2];

        if (file.exists()){
            pdfs[0] = filePath+fileName;
            fileName = UUID.randomUUID().toString()+".pdf";
        }

        Document document = new Document(PageSize.A2, 50, 50, 50, 50);

        try {
            fileOutputStream = new FileOutputStream(filePath + fileName);
            PdfWriter.getInstance(document,fileOutputStream );

            document.open();

            BaseFont bf=BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
            Font fontTitle = new Font(bf, 20, Font.NORMAL);

            for (int i=0;i0){
                PdfPTable table2 = new PdfPTable(imgUrl.size()==1?1:2); //表格两列
                table2.setHorizontalAlignment(Element.ALIGN_CENTER); //垂直居中
                float[] wid1 = {1f};
                if (imgUrl.size()>1){
                    wid1 = new float[]{0.5f, 0.5f}; //两列宽度的比例
                }
                table2.setWidths(wid1);
                table2.getDefaultCell().setBorderWidth(0); //不显示边框
                for (String str:imgUrl){
                    if (StringUtils.isNotBlank(str)){

                        String img = str.replaceAll(" ", "+");
                        String[] url = img.split("base64,");
                        String u = url[1];
                        // Base64解码
                        byte[] b = new BASE64Decoder().decodeBuffer(u);
                        // 生成图片
                        File file1 = new File(imgName);
                        out = new FileOutputStream(file1);
                        out.write(b);
                        out.flush();
                        out.close();
                        Image image = Image.getInstance(imgName);
                        table2.addCell(image);
                        file1.delete();
                    }
                }
                PdfPTable pTable2 = new PdfPTable(table2);
                document.add(pTable2);//增加到文档中
            }
            if (headList!=null){
                Font fontChinese = new Font(bf, 12, Font.NORMAL);
                PdfPTable pdfPTable = makeData(headList,fontChinese);

                if (dataList!=null){
                    for (String str : dataList){
                        PdfPCell cell = new PdfPCell();
                        Paragraph elements = new Paragraph(str,fontChinese);
                        elements.setAlignment(1);
                        cell.setVerticalAlignment(cell.ALIGN_MIDDLE);
                        cell.addElement(elements);
                        pdfPTable.addCell(cell);
                    }
                }
                PdfPTable pTable2 = new PdfPTable(pdfPTable);
                document.add(pTable2);
                document.close();
            }
            if (StringUtils.isNotBlank(pdfs[0])){
                pdfs[1] = filePath+fileName;

                String newPdf = UUID.randomUUID().toString()+".pdf";

                mergePdfFiles(pdfs, filePath + newPdf);
                new File(pdfs[1]).delete();
                new File(pdfs[0]).delete();
                new File(filePath + newPdf).renameTo(new File(pdfs[0]));
                new File(filePath + newPdf).delete();
            }
        } catch (Exception e) {
            log.error(ConstantParam.ERROR_SYSTEM,e);
        }finally {
            if (out!=null){
                try {
                    out.close();
                } catch (IOException e) {
                    log.error(ConstantParam.ERROR_SYSTEM,e);
                }
            }
            if (fileOutputStream!=null){
                try {
                    fileOutputStream.close();
                } catch (IOException e) {
                    log.error(ConstantParam.ERROR_SYSTEM,e);
                }
            }
            if (StringUtils.isNotBlank(imgName)){
                File file1 = new File(imgName);
                if (file1.exists()){
                    file1.delete();
                }
            }
        }
    }

    /**
     * 合并pdf文件
     * @param files  要合并的文件名路径数组
     * @param newfile  合并成新的文件路径
     * @return  是否执行成功
     */
    private static boolean mergePdfFiles(String[] files, String newfile) throws Exception {
        boolean retValue = false;
        Document document = null;
        FileOutputStream fileOutputStream = null;
        try {
            document = new Document();
            fileOutputStream = new FileOutputStream(newfile);
            PdfCopy copy = new PdfCopy(document, fileOutputStream);
            document.open();

            for (int i = 0; i < files.length; i++) {// 几个pdf文件循环
                PdfReader reader = null;
                try {
                    reader = new PdfReader(files[i]);
                    int n = reader.getNumberOfPages();
                    for (int j = 1; j <= n; j++) {// 一个文件有多少页循环
                        document.newPage();
                        PdfImportedPage page = copy.getImportedPage(reader, j);
                        copy.addPage(page);
                    }
                } finally {
                    reader.close();
                }
            }
            retValue = true;
        } finally {
            document.close();
            fileOutputStream.close();
        }
        return retValue;
    }

    /**
     * 合并单元格方法
     * @param list 表头数据  list中相连下标位置内容如果相同自动合并 上下位置内容相同自动合并
     * @param fontChinese 支持转换中文的Font对象
     * @return
     */
    private static PdfPTable makeData(List> list,Font fontChinese){
        int length = list.get(0).size();
        PdfPTable table2 = new PdfPTable(list.get(0).size());
        List> aa = new ArrayList<>();

        for (int i=0;i strings = list.get(i);
            int colNum = 1;
            List bb = new ArrayList<>();
            for (int j=0;j  a:aa){
            for (PdfPCell pCell:a){
                if (pCell!=null){
                    table2.addCell(pCell);
                }
            }
        }

        return table2;
    }
}