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Apache PDFBox Java库-是否有用于创建表的API?
原标题:Apache PDFBox Java library - Is there an API for creating tables?

我正在使用ApachePDFBoxJava库来创建PDF。有没有一种方法可以使用pdfbox创建数据表?如果没有这样的API来做,我会要求使用drawLine等手动绘制表格,对此有什么建议吗?

最佳回答

来源使用PDFBox创建表

以下方法使用指定的表格内容绘制表格。这有点像黑客,适用于小字符串的文本。它不执行换行,但您可以了解它是如何完成的。试试看!

/**
 * @param page
 * @param contentStream
 * @param y the y-coordinate of the first row
 * @param margin the padding on left and right of table
 * @param content a 2d array containing the table data
 * @throws IOException
 */
public static void drawTable(PDPage page, PDPageContentStream contentStream, 
                            float y, float margin, 
                            String[][] content) throws IOException {
    final int rows = content.length;
    final int cols = content[0].length;
    final float rowHeight = 20f;
    final float tableWidth = page.findMediaBox().getWidth() - margin - margin;
    final float tableHeight = rowHeight * rows;
    final float colWidth = tableWidth/(float)cols;
    final float cellMargin=5f;

    //draw the rows
    float nexty = y ;
    for (int i = 0; i <= rows; i++) {
        contentStream.drawLine(margin, nexty, margin+tableWidth, nexty);
        nexty-= rowHeight;
    }

    //draw the columns
    float nextx = margin;
    for (int i = 0; i <= cols; i++) {
        contentStream.drawLine(nextx, y, nextx, y-tableHeight);
        nextx += colWidth;
    }

    //now add the text        
    contentStream.setFont( PDType1Font.HELVETICA_BOLD , 12 );        

    float textx = margin+cellMargin;
    float texty = y-15;        
    for(int i = 0; i < content.length; i++){
        for(int j = 0 ; j < content[i].length; j++){
            String text = content[i][j];
            contentStream.beginText();
            contentStream.moveTextPositionByAmount(textx,texty);
            contentStream.drawString(text);
            contentStream.endText();
            textx += colWidth;
        }
        texty-=rowHeight;
        textx = margin+cellMargin;
    }
}

用法:

PDDocument doc = new PDDocument();
PDPage page = new PDPage();
doc.addPage( page );

PDPageContentStream contentStream = new PDPageContentStream(doc, page);

String[][] content = {{"a","b", "1"}, 
                      {"c","d", "2"}, 
                      {"e","f", "3"}, 
                      {"g","h", "4"}, 
                      {"i","j", "5"}} ;

drawTable(page, contentStream, 700, 100, content);
contentStream.close();
doc.save("test.pdf" );
问题回答

I created a small api for creating tables using PDFBox. It can be found on github ( https://github.com/dhorions/boxable ) .

生成的pdf示例可在此处找到http://goo.gl/a7QvRM

欢迎任何提示或建议。

由于不久前我也遇到了同样的问题,我开始为它建一个小图书馆,我也在努力跟上最新情况。

It uses Apache PDFBox 2.x and can be found here: https://github.com/vandeseer/easytable

它允许进行一些自定义,如在单元格级别设置字体、背景色、填充等、垂直和水平对齐、单元格跨越、换行和单元格中的图像。

也可以跨多页绘制表格。

例如,您可以创建这样的表:

此示例的代码可以在此处–同一文件夹中的其他示例。

接受的答案很好,但它只适用于Apache PDFBox 1.x,对于ApachePDFBox 2.x

因此,这里有相同的代码,但与ApachePDFBox2.x兼容:

方法drawTable

public static void drawTable(PDPage page, PDPageContentStream contentStream,
    float y, float margin, String[][] content) throws IOException {
    final int rows = content.length;
    final int cols = content[0].length;
    final float rowHeight = 20.0f;
    final float tableWidth = page.getMediaBox().getWidth() - 2.0f * margin;
    final float tableHeight = rowHeight * (float) rows;
    final float colWidth = tableWidth / (float) cols;

    //draw the rows
    float nexty = y ;
    for (int i = 0; i <= rows; i++) {
        contentStream.moveTo(margin, nexty);
        contentStream.lineTo(margin + tableWidth, nexty);
        contentStream.stroke();
        nexty-= rowHeight;
    }

    //draw the columns
    float nextx = margin;
    for (int i = 0; i <= cols; i++) {
        contentStream.moveTo(nextx, y);
        contentStream.lineTo(nextx, y - tableHeight);
        contentStream.stroke();
        nextx += colWidth;
    }

    //now add the text
    contentStream.setFont(PDType1Font.HELVETICA_BOLD, 12.0f);

    final float cellMargin = 5.0f;
    float textx = margin + cellMargin;
    float texty = y - 15.0f;
    for (final String[] aContent : content) {
        for (String text : aContent) {
            contentStream.beginText();
            contentStream.newLineAtOffset(textx, texty);
            contentStream.showText(text);
            contentStream.endText();
            textx += colWidth;
        }
        texty -= rowHeight;
        textx = margin + cellMargin;
    }
}

用法更新为使用尝试使用resources语句正确关闭资源:

try (PDDocument doc = new PDDocument()) {
    PDPage page = new PDPage();
    doc.addPage(page);

    try (PDPageContentStream contentStream = new PDPageContentStream(doc, page)) {
        String[][] content = {{"a", "b", "1"},
            {"c", "d", "2"},
            {"e", "f", "3"},
            {"g", "h", "4"},
            {"i", "j", "5"}};
        drawTable(page, contentStream, 700.0f, 100.0f, content);
    }
    doc.save("test.pdf");
}




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