您的代码显示了它，这是创建矩形并添加矩形的方法：
PdfTemplate template = writer.getDirectContent().createTemplate(120, 80);template.setColorFill(baseColor.RED);template.rectangle(0, 0, 120, 80);template.fill();writer.releaseTemplate(template);table.addCell(Image.getInstance(template));
iTextPdfTemplate生成PDF表单XObject。XObject表单又是PDF内容流，它是对
图形对象（包括路径对象，文本对象和采样图像）的任何序列的独立描述
（ISO 32000-1的8.10.1节），即单独的图形
指令流，其内容可以从任何其他内容流中引用。
对于页面内容流，这
是包含表格XObject的行：
q 1.13 0 0 1.13 229.77 695.69 cm /Xf1 Do Q
（将变换矩阵拉伸到1.13并移动一点，
然后绘制XObject Xf1，然后重置变换矩阵。）
该XObject Xf1的内容流是这样的：
1 0 0 rg0 0 120 80 ref
即，它将不描边的颜色设置为RGB红色，在
原点定义一个120x80的矩形，并填充它。
这是我用来获取页面内容的行代码：
String pageContent = new String(reader.getPageContent(1));
该行不足以获取所有内容详细信息：
它仅返回即时页面内容，而不返回即时内容中使用的XObjects形式和模式的详细指令。人们经常会发现其直接页面内容仅引用一个或多个XObjects形式的PDF。
尽管有外观，但页面内容是二进制性质，而不是文本性质。一旦使用了非标准编码的字体，PDF字符串的内容在Java字符串中就毫无意义，或者（取决于您的标准编码）甚至中断了。
相反，应该使用iText解析器框架，例如：
ExtRenderListener extRenderListener = new ExtRenderListener(){ @Override public void beginTextBlock() { } @Override public void renderText(TextRenderInfo renderInfo) { } @Override public void endTextBlock() { } @Override public void renderImage(ImageRenderInfo renderInfo) { } @Override public void modifyPath(PathConstructionRenderInfo renderInfo) { pathInfos.add(renderInfo); } @Override public Path renderPath(PathPaintingRenderInfo renderInfo) { GraphicsState graphicsState; try { graphicsState = getGraphicsState(renderInfo); } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) { e.printStackTrace(); return null; } Matrix ctm = graphicsState.getCtm(); if ((renderInfo.getOperation() & PathPaintingRenderInfo.FILL) != 0) { System.out.printf("FILL (%s) ", toString(graphicsState.getFillColor())); if ((renderInfo.getOperation() & PathPaintingRenderInfo.STROKE) != 0) System.out.print("and "); } if ((renderInfo.getOperation() & PathPaintingRenderInfo.STROKE) != 0) { System.out.printf("STROKE (%s) ", toString(graphicsState.getStrokeColor())); } System.out.print("the path "); for (PathConstructionRenderInfo pathConstructionRenderInfo : pathInfos) { switch (pathConstructionRenderInfo.getOperation()) { case PathConstructionRenderInfo.MOVETO: System.out.printf("move to %s ", transform(ctm, pathConstructionRenderInfo.getSegmentData())); break; case PathConstructionRenderInfo.CLOSE: System.out.printf("close %s ", transform(ctm, pathConstructionRenderInfo.getSegmentData())); break; case PathConstructionRenderInfo.CURVE_123: System.out.printf("curve123 %s ", transform(ctm, pathConstructionRenderInfo.getSegmentData())); break; case PathConstructionRenderInfo.CURVE_13: System.out.printf("curve13 %s ", transform(ctm, pathConstructionRenderInfo.getSegmentData())); break; case PathConstructionRenderInfo.CURVE_23: System.out.printf("curve23 %s ", transform(ctm, pathConstructionRenderInfo.getSegmentData())); break; case PathConstructionRenderInfo.LINETO: System.out.printf("line to %s ", transform(ctm, pathConstructionRenderInfo.getSegmentData())); break; case PathConstructionRenderInfo.RECT: System.out.printf("rectangle %s ", transform(ctm, expandRectangleCoordinates(pathConstructionRenderInfo.getSegmentData()))); break; } } System.out.println(); pathInfos.clear(); return null; } @Override public void clipPath(int rule) { } List<Float> transform(Matrix ctm, List<Float> coordinates) { List<Float> result = new ArrayList<>(); for (int i = 0; i + 1 < coordinates.size(); i += 2) { Vector vector = new Vector(coordinates.get(i), coordinates.get(i + 1), 1); vector = vector.cross(ctm); result.add(vector.get(Vector.I1)); result.add(vector.get(Vector.I2)); } return result; } List<Float> expandRectangleCoordinates(List<Float> rectangle) { if (rectangle.size() < 4) return Collections.emptyList(); return Arrays.asList( rectangle.get(0), rectangle.get(1), rectangle.get(0) + rectangle.get(2), rectangle.get(1), rectangle.get(0) + rectangle.get(2), rectangle.get(1) + rectangle.get(3), rectangle.get(0), rectangle.get(1) + rectangle.get(3) ); } String toString(baseColor baseColor) { if (baseColor == null) return "DEFAULT"; return String.format("%s,%s,%s", baseColor.getRed(), baseColor.getGreen(), baseColor.getBlue()); } GraphicsState getGraphicsState(PathPaintingRenderInfo renderInfo) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException { Field gsField = PathPaintingRenderInfo.class.getDeclaredField("gs"); gsField.setAccessible(true); return (GraphicsState) gsField.get(renderInfo); } final List<PathConstructionRenderInfo> pathInfos = new ArrayList<>();};try ( InputStream resource = [RETRIEVE FILE TO PARSE AS INPUT STREAM]){ PdfReader pdfReader = new PdfReader(resource); for (int page = 1; page <= pdfReader.getNumberOfPages(); page++) { System.out.printf("nPage %sn====n", page); PdfReaderContentParser parser = new PdfReaderContentParser(pdfReader); parser.processContent(page, extRenderListener); }}(ExtractPaths
test method testExtractFromTestCreation
)
For your sample file this results in the output
Page 1====STROKE (0,0,0) the path rectangle [88.3, 693.69, 227.77, 693.69, 227.77, 788.0, 88.3, 788.0] STROKE (0,0,0) the path rectangle [227.77, 693.69, 367.24, 693.69, 367.24, 788.0, 227.77, 788.0] STROKE (0,0,0) the path rectangle [367.23, 693.69, 506.7, 693.69, 506.7, 788.0, 367.23, 788.0] FILL (255,0,0) the path rectangle [229.77, 695.69, 365.37, 695.69, 365.37, 786.09, 229.77, 786.09] STROKE (DEFAULT) the path move to [228.0, 810.0] line to [338.0, 810.0]
iText将颜色值表示为字节（0-255），而不是
PDF使用的单位范围（0.0-1.0）。因此，您看到“（255,0,0）”，其中PDF选择了“ 1
0 0 rg”。
