Itext 5 Table 行拆分到新页面并重复

Question

我是第一次使用 itext 5 legacy，我是应用程序开发的新手。我正在生成一个 table，它不断将列拆分为新页面上的新行，它会重复数据。

第一个Table：第二个 table 具有拆分列和重复数据：

第三个table：

第四个table：

第五个Table：

table 必须是一长行。请帮我纠正一下，

代码如下：

    private void createPdf() throws FileNotFoundException, DocumentException,IOException {
       // getIntent().setType("application/pdf");
        Toast.makeText(this,"GENERATING PDF ..."+ directory_path,Toast.LENGTH_LONG).show();
        File file = new File(directory_path+filename);
        if (!file.exists())
        {
            file.mkdirs();
        }
        ProductCondition prodCond = new ProductCondition(true,"GREEN","BFobrourinbiurfufbjfnbbu");
        ProductOperations prodOper = new ProductOperations(true,true,true,1000,986,500,"OBNobdfiuvdob");
        Product product = new Product("bkbukb","sfdvsf","sdfsdfs","1sfdssV45",prodCond,prodOper);
        technicians.addProduct(product);
        Document document = new Document(PageSize.A1.rotate());
        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(directory_path+filename));
        document.open();
        PdfPTable table = new PdfPTable(15);
        table.setTotalWidth(5000);
        table.setWidthPercentage(100);
        List<String> listData =new ArrayList<>() ;
        listData = GetTechnicianData(technicians);
        Image image1 = GetImage();
        Image image2 = GetImage();
        table.addCell("Bloop");
        table.addCell("han Solo");
        table.addCell("Hamburger");
        table.addCell("NUmber time");
        table.addCell("boogaloo");
        table.addCell("Boo thang");
        table.addCell("Spanish");
        table.addCell("Inquisition");
        table.addCell("Never ");
        table.addCell("Death");
        table.addCell("Test ");
       // table.addCell("Button");
        table.addCell("Lights");
        table.addCell("Sunshine");
        table.addCell("Comment");
        table.addCell("Images");
        table.setHeaderRows(3);
        table.setFooterRows(1);
        table.getDefaultCell().setBackgroundColor(GrayColor.GRAYWHITE);
        PdfPCell cell;
        Toast.makeText(this,"ADDING PRELIMINARY DATA",Toast.LENGTH_LONG).show();
            for (int c = 0; c < 14; c++) {
                cell = new PdfPCell();
                cell.setFixedHeight(50);
                cell.addElement(new Paragraph(listData.get(c)));
                cell.setHorizontalAlignment(Element.ALIGN_CENTER);
                //cell.setBorder(PdfPCell.NO_BORDER);
                table.addCell(cell);
                table.setKeepTogether(true);
            }
        Paragraph p = new Paragraph();
        p.add(new Chunk(image1,0,0,true));
        p.add(new Chunk(image2,0,0,true));
        cell = new PdfPCell();
        cell.addElement(p);
        //cell.setBorder(PdfPCell.NO_BORDER);
        table.addCell(cell);
        //document.add(table);
        Toast.makeText(this,"ADDING IMAGES...",Toast.LENGTH_LONG).show();

          /*  cell = new PdfPCell();
            Paragraph p = new Paragraph();
            p.add(new Chunk(image1,0,0,true));
            p.add(new Chunk(image1,0,0,true));
            cell.addElement(p);
            table.addCell(cell);*/

       // document.add(table);


        PdfContentByte canvas = writer.getDirectContent();
        PdfTemplate tableTemplate = canvas.createTemplate(5000, 2600);
        table.writeSelectedRows(0, -1, 0, 800, tableTemplate);
        PdfTemplate clip;
        for (int j = 0; j <5000; j += 1000) {
            table.setKeepTogether(true);
            document.newPage();
            for (int i = 2600; i > 0; i -= 1300) {

                clip = canvas.createTemplate(2000, 1300);
                clip.addTemplate(tableTemplate, -j, 1750 - i);
                canvas.addTemplate(clip, 50, 312);
                table.setKeepTogether(true);
                //canvas.addImage(image1);
            }
        }
        // byte [] pdf = Files.readAllBytes(file.toPath());
        Uri filepdf = Uri.fromFile(new File(directory_path+filename));
        UploadTask uploadTask = storageReference.child(technicians.getEmailAddress()).child("PDFUpdate").putFile(filepdf);
        Toast.makeText(this,"PDF Generated Successfully",Toast.LENGTH_LONG).show();
        document.close();

       /* PackageManager packageManager = context.getPackageManager();
        Intent testIntent = new Intent(Intent.ACTION_VIEW);
        testIntent.setType("application/pdf");
        List list = packageManager.queryIntentActivities(testIntent, PackageManager.MATCH_DEFAULT_ONLY);
        if (list.size() > 0) {
            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_VIEW);
            Uri uri = Uri.fromFile(file);
            intent.setDataAndType(uri, "application/pdf");
            context.startActivity(intent);
        } else {
            Toast.makeText(context, "Download a PDF Viewer to see the generated PDF", Toast.LENGTH_SHORT).show();
        }
*/
    }
    private void createPdfWrapper() throws FileNotFoundException, DocumentException ,IOException{

        int hasWriteStoragePermission = ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (hasWriteStoragePermission != PackageManager.PERMISSION_GRANTED) {

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                if (!ActivityCompat.shouldShowRequestPermissionRationale(this,Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
                    showMessageOKCancel("You need to allow access to Storage",
                            new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                                        ActivityCompat.requestPermissions(CentralHome.this, new String[]{ Manifest.permission.WRITE_EXTERNAL_STORAGE},
                                                REQUEST_CODE_ASK_PERMISSIONS);
                                    }
                                }
                            });
                    return;
                }
                ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                        REQUEST_CODE_ASK_PERMISSIONS);
                return;
            }

        } else {
            createPdf();
        }
    }

    private Image GetImage() throws BadElementException,IOException{


            Drawable d = getResources().getDrawable(R.drawable.logo);
            BitmapDrawable bitDw = ((BitmapDrawable) d);
            Bitmap bmp = bitDw.getBitmap();
            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
            Image image = Image.getInstance(stream.toByteArray());
            image.scalePercent(10);
            return image;
            // document.add(image);

    }

}

Answer 1

在 createPdf 中，您有一个循环将模板的部分与整个 table 添加到单独的页面：

for (int j = 0; j <5000; j += 1000) {
    table.setKeepTogether(true);
    document.newPage();
    for (int i = 2600; i > 0; i -= 1300) {
        clip = canvas.createTemplate(2000, 1300);
        clip.addTemplate(tableTemplate, -j, 1750 - i);
        canvas.addTemplate(clip, 50, 312);
        table.setKeepTogether(true);
        //canvas.addImage(image1);
    }
}

每个部分都是 2000 个单位宽 (canvas.createTemplate(2000, 1300))，但是当前进到下一个部分时，您只能向右走 1000 个单位 (j += 1000)。因此，每个新部分（第一部分除外）重复前一部分的最后三列（后半部分）。

您可以通过在每个部分后向右移动 2000 个单位来防止这些重复，即通过替换

for (int j = 0; j <5000; j += 1000)

来自

for (int j = 0; j <5000; j += 2000)

顺便说一句，您的代码中还有许多其他怪异之处，例如

table.setHeaderRows(3);
table.setFooterRows(1);

（这里你声明如果 table 直接添加到 Document 并拆分为多个页面，你有三行 header 行和一个页脚行自动重复；作为您不将 table 添加到 Document 而是手动添加到模板，该功能未被使用这是幸运的，因为您只创建了足够的单元格来填充两行，甚至不足以声明 header 行)

和多次调用

table.setKeepTogether(true)

after 已经在

中渲染了 table

table.writeSelectedRows(0, -1, 0, 800, tableTemplate)

渲染 table 之后设置控制渲染过程的属性为时已晚...

您在评论中说您只想拥有一个普通的 15 列 table，而不是那些列分布在多个页面上的列。在那种情况下，你为什么不简单地做

Document document = new Document(PageSize.A1.rotate());
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(directory_path+filename));
document.open();
PdfPTable table = new PdfPTable(15);
table.setWidthPercentage(100);

... create cells and add them to the table ...

document.add(table);
document.close();

PdfContentByte、PdfTemplate 和 writeSelectedRows 的所有用法对于您的用例来说完全没有必要。

Itext 5 Table 行拆分到新页面并重复

Itext 5 Table rows splitting to new page and repeating

java

android

pdf-generation

itext