itext 7表边框问题

debugcn 发表于 Dev

西

当前版本的itext 7在呈现表格中某些单元格跨越几行的单元格边框时存在问题。

正确的（通过文档，如下所示）呈现边框的方式将导致空指针异常。

.setBorder(Border.NO_BORDER)
.setBorderTop(new SolidBorder(1f))

直观的方式（如下所示）忽略无边界请求，仅渲染所有边框，我只要求顶部边框

.setBorderBottom(Border.NO_BORDER)
.setBorderLeft(Border.NO_BORDER)
.setBorderRight(Border.NO_BORDER)
.setBorderTop(new SolidBorder(1f))

这仅发生在第一行，最后到右边的单元格（在我的例子中标记为“ 1.4”）。否则，我会发现iText7是一个了不起的产品，也是一个出色的软件工程的典范。谢谢！

下面是说明这两种情况的完整源代码：

import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.border.Border;
import com.itextpdf.layout.border.SolidBorder;
import com.itextpdf.layout.element.Cell;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Table;
import com.itextpdf.layout.property.VerticalAlignment;
import java.io.File;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;


public class TableBorderTest {

public static final String OUTPUT_FOLDER = "./target/test/";

@BeforeClass
public static void beforeClass() {
    new File(OUTPUT_FOLDER).mkdirs();
}

@AfterClass
public static void tearDownClass() throws Exception {
}

/**
 * Test of generate method, of class SummaryResultsVsAll.
 * @throws java.lang.Exception
 */
@Test
public void testGenerate1() throws Exception {
    System.out.println("generate");

    String outPdf = OUTPUT_FOLDER + "TableBorderTest.pdf";
    PdfWriter writer = new PdfWriter(outPdf);
    PdfDocument pdfDocument;
    pdfDocument = new PdfDocument(writer);
    Document document = new Document(pdfDocument);

    Table table = new Table(new float[]{10f, 10f, 20.0F, 70.0F});
    table.setWidthPercent(100)
            .setPadding(0)
            .setFontSize(9);

    Cell aCell = new Cell(7, 1);
    aCell.add("1.1").setBorder(Border.NO_BORDER).setBorderBottom(new SolidBorder(1f)).setBorderTop(new SolidBorder(1f));

    table.addCell(aCell);

    //create row
    Cell bCell = new Cell(3, 1);
    Paragraph paragraph = new Paragraph("1.2");
    paragraph.setBold();
    bCell.add(paragraph);
    bCell.setBorder(Border.NO_BORDER).setBorderTop(new SolidBorder(1f));
    table.addCell(bCell);

    //row
    paragraph = new Paragraph("1.3").setFontSize(7).setPaddingTop(10);
    Cell someCell = createTableCellNoBorder();
    someCell.add(paragraph).setBorderTop(new SolidBorder(1f));
    table.addCell(someCell);

    someCell = createTableCellNoBorder();
    someCell.add("1.4").setBorderTop(new SolidBorder(1f));
    table.addCell(someCell);

    // row        
    paragraph = new Paragraph("2.1").setFontSize(7);
    someCell = createTableCellNoBorder();
    someCell.add(paragraph);
    table.addCell(someCell);

    someCell = createTableCellNoBorder();
    someCell.add("2.2");
    table.addCell(someCell);

    //row
    paragraph = new Paragraph("3.1").setFontSize(7);
    someCell = createTableCellNoBorder();
    someCell.add(paragraph);
    table.addCell(someCell);

    someCell = createTableCellNoBorder();
    someCell.add("3.2");
    table.addCell(someCell);

    //row
    someCell = createDoubleTableCell();
    paragraph = new Paragraph("4.1");
    paragraph.setBold();
    someCell.add(paragraph).setBorderBottom(new SolidBorder(1f)).setBorderTop(new SolidBorder(1f));
    table.addCell(someCell);

    someCell = createTableCellWithTopAndBottomBorders();
    someCell.add("4.2");
    table.addCell(someCell);

    //create row
    someCell = createDoubleTableCell();
    paragraph = new Paragraph("5.1");
    paragraph.setBold();
    someCell.add(paragraph).setBorderBottom(new SolidBorder(1f)).setBorderTop(new SolidBorder(1f));
    table.addCell(someCell);

    someCell = createTableCellWithTopAndBottomBorders();

    someCell.add("5.2");
    table.addCell(someCell);

    //create row
    someCell = createDoubleTableCell();
    paragraph = new Paragraph("6.1");
    paragraph.setBold();
    someCell.add(paragraph).setBorderBottom(new SolidBorder(1f)).setBorderTop(new SolidBorder(1f));
    table.addCell(someCell);

    someCell = createTableCellWithTopAndBottomBorders();

    someCell.add("6.2");
    table.addCell(someCell);

    //create row
    someCell = createDoubleTableCell();
    paragraph = new Paragraph("7.1");
    paragraph.setBold();
    someCell.add(paragraph).setBorderBottom(new SolidBorder(1f)).setBorderTop(new SolidBorder(1f));
    table.addCell(someCell);

    someCell = createTableCellWithTopAndBottomBorders();

    someCell.add("7.2");
    table.addCell(someCell);

    document.add(table);

    pdfDocument.close();
    writer.flush();
    writer.close();

}
    /**
 * Test of generate method, of class SummaryResultsVsAll.
 * @throws java.lang.Exception
 */
@Test
public void testGenerate2() throws Exception {
    System.out.println("generate");

    String outPdf = OUTPUT_FOLDER + "TableBorderTest2.pdf";
    PdfWriter writer = new PdfWriter(outPdf);
    PdfDocument pdfDocument;
    pdfDocument = new PdfDocument(writer);
    Document document = new Document(pdfDocument);

    Table table = new Table(new float[]{10f, 10f, 20.0F, 70.0F});
    table.setWidthPercent(100)
            .setPadding(0)
            .setFontSize(9);

    Cell aCell = new Cell(7, 1);
    aCell.add("1.1").setBorder(Border.NO_BORDER).setBorderBottom(new SolidBorder(1f)).setBorderTop(new SolidBorder(1f));

    table.addCell(aCell);

    //create row
    Cell bCell = new Cell(3, 1);
    Paragraph paragraph = new Paragraph("1.2");
    paragraph.setBold();
    bCell.add(paragraph);
    bCell.setBorder(Border.NO_BORDER).setBorderTop(new SolidBorder(1f));
    table.addCell(bCell);

    //row
    paragraph = new Paragraph("1.3").setFontSize(7).setPaddingTop(10);
    Cell someCell = createTableCellNoBorder();
    someCell.add(paragraph).setBorderTop(new SolidBorder(1f));
    table.addCell(someCell);

    someCell = createTableCellWithTopBorder();
    someCell.add("1.4");
    table.addCell(someCell);

    // row        
    paragraph = new Paragraph("2.1").setFontSize(7);
    someCell = createTableCellNoBorder();
    someCell.add(paragraph);
    table.addCell(someCell);

    someCell = createTableCellNoBorder();
    someCell.add("2.2");
    table.addCell(someCell);

    //row
    paragraph = new Paragraph("3.1").setFontSize(7);
    someCell = createTableCellNoBorder();
    someCell.add(paragraph);
    table.addCell(someCell);

    someCell = createTableCellNoBorder();
    someCell.add("3.2");
    table.addCell(someCell);

    //row
    someCell = createDoubleTableCell();
    paragraph = new Paragraph("4.1");
    paragraph.setBold();
    someCell.add(paragraph).setBorderBottom(new SolidBorder(1f)).setBorderTop(new SolidBorder(1f));
    table.addCell(someCell);

    someCell = createTableCellWithTopAndBottomBorders();
    someCell.add("4.2");
    table.addCell(someCell);

    //create row
    someCell = createDoubleTableCell();
    paragraph = new Paragraph("5.1");
    paragraph.setBold();
    someCell.add(paragraph).setBorderBottom(new SolidBorder(1f)).setBorderTop(new SolidBorder(1f));
    table.addCell(someCell);

    someCell = createTableCellWithTopAndBottomBorders();

    someCell.add("5.2");
    table.addCell(someCell);

    //create row
    someCell = createDoubleTableCell();
    paragraph = new Paragraph("6.1");
    paragraph.setBold();
    someCell.add(paragraph).setBorderBottom(new SolidBorder(1f)).setBorderTop(new SolidBorder(1f));
    table.addCell(someCell);

    someCell = createTableCellWithTopAndBottomBorders();

    someCell.add("6.2");
    table.addCell(someCell);

    //create row
    someCell = createDoubleTableCell();
    paragraph = new Paragraph("7.1");
    paragraph.setBold();
    someCell.add(paragraph).setBorderBottom(new SolidBorder(1f)).setBorderTop(new SolidBorder(1f));
    table.addCell(someCell);

    someCell = createTableCellWithTopAndBottomBorders();

    someCell.add("7.2");
    table.addCell(someCell);

    document.add(table);

    pdfDocument.close();
    writer.flush();
    writer.close();

}

    private Cell createTableCellNoBorder() {
    Cell someCell;
    someCell = new Cell()
            .setPadding(0)
            .setBorder(Border.NO_BORDER)
            .setVerticalAlignment(VerticalAlignment.TOP);
    return someCell;
}
 private Cell createTableCellWithTopBorder() {
    Cell someCell;
    someCell = new Cell()
            .setPadding(0)
            .setBorderBottom(Border.NO_BORDER).setBorderLeft(Border.NO_BORDER).setBorderRight(Border.NO_BORDER).setBorderTop(new SolidBorder(1f))
            .setVerticalAlignment(VerticalAlignment.TOP);
    return someCell;
}

private Cell createTableCellWithTopAndBottomBorders() {
    Cell someCell;
    someCell = new Cell()
            .setPadding(0)
            .setBorder(Border.NO_BORDER).setBorderBottom(new SolidBorder(1f)).setBorderTop(new SolidBorder(1f))
            .setVerticalAlignment(VerticalAlignment.TOP);
    return someCell;
}

private Cell createDoubleTableCell() {
    Cell someCell;
    someCell = new Cell(1, 2)
            .setPadding(0)
            .setBorder(Border.NO_BORDER)
            .setVerticalAlignment(VerticalAlignment.TOP);
    return someCell;
}

}

mkl

该NullPointerException问题本质上是在此分析的相同错误的答案。相应地，该错误已在开发代码中修复。

因此，使用当前的iText开发代码（当前的7.0.1-SNAPSHORT）运行测试类不会导致异常也就不足为奇了。

此外，两种测试方法的结果相同，如下所示：