Question

我的任务是从PDF中提取特定坐标的文本。

我已经使用Apache Pdfbox客户端进行数据提取。

要使用PDF以毫米为单位的PDF更改工具从PDF获取x，y，高度和宽度坐标。当我在矩形中传递值时，这些值不会变为空值。

public String getTextUsingPositionsUsingPdf(String pdfLocation, int pageNumber, double x, double y, double width,
                double height) throws IOException {
            String extractedText = "";
            // PDDocument Creates an empty PDF document. You need to add at least
            // one page for the document to be valid.
            // Using load method we can load a PDF document
            PDDocument document = null;
            PDPage page = null;
            try {
                if (pdfLocation.endsWith(".pdf")) {
                    document = PDDocument.load(new File(pdfLocation));
                    int getDocumentPageCount = document.getNumberOfPages();
                    System.out.println(getDocumentPageCount);

                    // Get specific page. THe parameter is pageindex which starts with // 0. If we need to
                    // access the first page then // the pageIdex is 0 PDPage
                    if (getDocumentPageCount > 0) {
                        page = document.getPage(pageNumber + 1);
                    } else if (getDocumentPageCount == 0) {
                        page = document.getPage(0);
                    }
                    // To create a rectangle by passing the x axis, y axis, width and height 
                    Rectangle2D rect = new Rectangle2D.Double(x, y, width, height);
                    String regionName = "region1";

                    // Strip the text from PDF using PDFTextStripper Area with the
                    // help of Rectangle and named need to given for the rectangle
                    PDFTextStripperByArea stripper = new PDFTextStripperByArea();
                    stripper.setSortByPosition(true);
                    stripper.addRegion(regionName, rect);
                    stripper.extractRegions(page);
                    System.out.println("Region is " + stripper.getTextForRegion("region1"));
                    extractedText = stripper.getTextForRegion("region1");
                } else {
                    System.out.println("No data return");
                }
            } catch (IOException e) {
                System.out.println("The file  not found" + "");
            } finally {
                document.close();
            }
            // Return the extracted text and this can be used for assertion
            return extractedText;
        }

请建议我的方法是否正确。

Answer 1

我已使用此PDF tutorialspoint.com/uipath/uipath_tutorial.pdf。在尝试查找文本“比赛的一部分”的地方，该文本的x = 55.6毫米y = 168.8宽度= 210.0毫米，高度= 297.0。但是我得到的是空值

我用这些输入测试了您的方法：

bytes=4
((max=2**(bytes*8)-1))
for ((i=0; i<max; i++)); do
   printf -v hex %08x "$i"
   cansend slcan0 "7e0#02090${hex}0000000000"
done

（ExtractText测试System.out.println("Extracting like Venkatachalam Neelakantan from uipath_tutorial.pdf\n"); float MM_TO_UNITS = 1/(10*2.54f)*72; String text = getTextUsingPositionsUsingPdf("src/test/resources/mkl/testarea/pdfbox2/extract/uipath_tutorial.pdf", 0, 55.6 * MM_TO_UNITS, 168.8 * MM_TO_UNITS, 210.0 * MM_TO_UNITS, 297.0 * MM_TO_UNITS); System.out.printf("\n---\nResult:\n%s\n", text);）

得到结果

testUiPathTutorial

假设您实际上是在寻找“内容的一部分”，而不是“比赛的一部分”，只是缺少了“ a”；可能是在测量时寻找了可见字母图形的开始，但是实际字形的起源要早于此。如果您选择一个较小的 x ，例如54.6毫米，您还会得到'a'。

考虑到矩形的宽度和高度，获得的不仅仅是“一部分内容”，这也就不足为奇了。

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无法使用java apache pdfbox从PDF中提取特定坐标的值

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