Java 类com.itextpdf.text.pdf.parser.RenderListener 实例源码

/**
 * Extracts text from a PDF document.
 *
 * @param src the original PDF document
 * @throws java.io.IOException
 */
public List<Page> extractText(InputStream src) throws IOException {
    List<Page> pages = Lists.newArrayList();

    PdfReader reader = new PdfReader(src);
    RenderListener listener = new InternalListener();
    PdfContentStreamProcessor processor = new PdfContentStreamProcessor(listener);

    for (int i = 1; i <= reader.getNumberOfPages(); i++) {
        pages.add(currentPage = new Page());
        PdfDictionary pageDic = reader.getPageN(i);
        PdfDictionary resourcesDic = pageDic.getAsDict(PdfName.RESOURCES);
        processor.processContent(ContentByteUtils.getContentBytesForPage(reader, i), resourcesDic);
    }
    reader.close();

    return pages;
}

public static float[] getKeyWords(String filePath) {
    try {
        PdfReader pdfReader = new PdfReader(filePath);
        int pageNum = pdfReader.getNumberOfPages();
        PdfReaderContentParser pdfReaderContentParser = new PdfReaderContentParser(pdfReader);
        // 下标从1开始
        for (i = 1; i <= pageNum; i++) {
            pdfReaderContentParser.processContent(i, new RenderListener() {
                public void renderText(TextRenderInfo textRenderInfo) {
                    String text = textRenderInfo.getText();
                    System.out.println(i + ":" +text);
                    if (null != text && text.contains(KEY_WORD)) {
                        Float boundingRectange = textRenderInfo.getBaseline().getBoundingRectange();
                        resu = new float[3];
                        resu[0] = boundingRectange.x;
                        resu[1] = boundingRectange.y;
                        resu[2] = i;
                    }
                }
                public void renderImage(ImageRenderInfo arg0) {

                }
                public void endTextBlock() {

                }
                public void beginTextBlock() {

                }
            });
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return resu;
}