c#抽取pdf文档标题（2）

 public class IETitle
    {
        public static List<WordInfo> WordsInfo = new List<WordInfo>();

        private static string pdfcontent;
        public static HandleResult GetTitle(string path, string realtitle)
        {
            WordsInfo.Clear();

            string content = string.Empty;
            try
            {
                content = ITextSharpLib.ExtractTextFromPdf(path);
            }
            catch
            {
                try
                {
                    content = PDFBoxLib.Pdf2txt(path);
                }
                catch (Exception ex)
                {

                }
            }

            pdfcontent = content;

            PDFBoxLib.HandleContent(path);

            //处理字符

            Word w = new Word();
            w.MakeWord(WordsInfo);

            Line line = new Line();
            line.MakeLine(w);

            //处理行
            Block block = new Block();
            block.MakeBlock(line);

            //获取全部的文本
            string text = string.Empty;

            try
            {
                text = ITextSharpLib.ExtractTextFromPdf(path, 0);
            }
            catch (Exception ex)
            {
                text = content;
            }

            HandleResult title = new HandleResult() { Title = "" };

            try
            {
                var sentences = text.Split('
');

                InfoExtract ie = new InfoExtract(sentences, text);

                title = ie.ExtractTitle(block, realtitle);

            }
            catch (Exception ex)
            {
                Logger.Debug(ex.Message);
            }

            return title;
        }
    }

上面就是获取标题的整体逻辑代码。29行，是调用pdfboxLib，读取pdf第一页内容：

 public static string HandleContent(string fileName, int pageIndex = 1)
        {
            try
            {
                PDDocument document = null;
                try
                {
                    document = PDDocument.load(fileName);
                    List allPages = document.getDocumentCatalog().getAllPages();

                    int size = pageIndex == 0 ? allPages.size() : 1;

                    for (int i = 0; i < size; i++)
                    {
                        var page = (PDPage)allPages.get(i);

                        var contents = page.getContents();

                        PrintTextLocatins2 printer = new PrintTextLocatins2();

                        if (contents != null)
                        {
                            printer.processStream(page, page.findResources(), page.getContents().getStream());
                        }
                    }
                }
                catch (Exception ex)
                {
                }
                finally
                {
                    if (document != null)
                    {
                        document.close();
                    }
                }
            }
            catch (Exception ex)
            {

            }
            return "";
        }

第23行 printer.processStream方法，会触发自定义类PrintTextLocation2类中的字符处理方法 processTextPosition：

 public class PrintTextLocatins2 : PDFTextStripper
    {
        private static int BOLD_F_NUM = 2;
        private static String[] BOLD_FLAGS = { "Bold", "CAJ FNT04" };
        private static int ITALIC_F_NUM = 2;
        private static String[] ITALIC_FLAGS = { "Italic", "CAJ FNT03" };

        private static bool IsBold(String font)
        {
            int i;
            for (i = 0; i < BOLD_F_NUM; i++)
                if (font.Contains(BOLD_FLAGS[i]))
                    return true;
            return false;
        }

        private static bool IsItalic(String font)
        {
            int i;
            for (i = 0; i < ITALIC_F_NUM; i++)
                if (font.Contains(ITALIC_FLAGS[i]))
                    return true;
            return false;
        }

        public PrintTextLocatins2()
        {
            base.setSortByPosition(false);
        }
        protected override void processTextPosition(TextPosition text)
        {

            WordInfo info = new WordInfo()
            {
                X = text.getX(),
                Y = text.getY(),
                XDirAdj = text.getXDirAdj(),
                YDirAdj = text.getYDirAdj(),
                FontSize = text.getFontSize(),
                Xscale = text.getXScale(),
                Yscale = text.getYScale(),
                Height = text.getHeight(),
                Space = text.getWidthOfSpace(),
                Width = text.getWidth(),

                Subfont = text.getFont().getSubType(),
                Basefont = text.getFont().getBaseFont(),
                IsBold = IsBold(text.getFont().getBaseFont()),
                IsItalic = IsItalic(text.getFont().getBaseFont()),

                XSize = (int)(text.getFontSize() * text.getXScale()),

                YSize = (int)(text.getFontSize() * text.getYScale()),

                Word = text.getCharacter()
            };


            if (info.Space.ToString() == "非数字")
            {
                info.Space = 0;
            }

            IETitle.WordsInfo.Add(info);
        }
    }

这样我们就利用pdfbox收集了pdf文档的字符信息。