PDFBox删除图像后出现错误 – 此页面存在错误。Acrobat可能无法正确显示页面。

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英文:

PDFBox Error After Deleting Image - An error exists on this page. Acrobat may not display the page correctly

问题

  1. 我正在使用pdfbox库的2.0版本。我必须从页面中删除所选图像并添加另一个图像。它可以正常运行。但是当我打开该文件时，会显示一个警告消息：***此页面存在错误。Acrobat可能无法正确显示页面***。如下是屏幕截图：
  3. ![错误图片][1]
  5. 下面是删除图像并添加其他图像的代码示例：（已编辑并修复）
  7. ```java
  8. public static void removeImages(String pdfFile) throws Exception {
  9.     PDDocument document = PDDocument.load(new File(pdfFile));
  11.     for (PDPage page : document.getPages()) {
  12.         PDResources pdResources = page.getResources();
  13.         String[] qrCodeCosName = new String[1];
  15.         pdResources.getXObjectNames().forEach(propertyName -> {
  16.             if (!pdResources.isImageXObject(propertyName)) {
  17.                 return;
  18.             }
  19.             PDXObject o;
  20.             try {
  21.                 o = pdResources.getXObject(propertyName);
  22.                 if (o instanceof PDImageXObject) {
  23.                     PDImageXObject pdImageXObject = (PDImageXObject) o;
  24.                     if (pdImageXObject.getMetadata() != null) {
  25.                         // 从资源中移除
  26.                         ((COSDictionary) pdResources.getCOSObject().getDictionaryObject(COSName.XOBJECT))
  27.                                 .removeItem(propertyName);
  28.                         qrCodeCosName[0] = propertyName.getName();
  29.                     }
  30.                 }
  31.             } catch (IOException e) {
  32.                 e.printStackTrace();
  33.             }
  34.         });
  36.         PDFStreamParser parser = new PDFStreamParser(page);
  37.         parser.parse();
  38.         List<Object> tokens = parser.getTokens();
  39.         System.out.println("原始 tokens 大小：" + tokens.size());
  40.         List<Object> newTokens = new ArrayList<Object>();
  42.         for (int j = 0; j < tokens.size(); j++) {
  43.             Object token = tokens.get(j);
  45.             if (token instanceof Operator) {
  46.                 Operator op = (Operator) token;
  48.                 // 找到图像 - 删除它
  49.                 if (op.getName().equals("Do")) {
  50.                     COSName cosName = (COSName) tokens.get(j - 1);
  51.                     if (cosName.getName().equals(qrCodeCosName[0])) {
  52.                         newTokens.remove(newTokens.size() - 1);
  53.                         continue;
  54.                     }
  55.                 }
  56.                 newTokens.add(token);
  57.             }
  59.             System.out.println("tokens 大小：" + newTokens.size());
  60.             PDStream newContents = new PDStream(document);
  61.             OutputStream out = newContents.createOutputStream();
  62.             ContentStreamWriter writer = new ContentStreamWriter(out);
  63.             writer.writeTokens(newTokens);
  64.             out.close();
  65.             page.setContents(newContents);
  67.             // 添加其他图像
  68.             PDImageXObject pdImage = PDImageXObject.createFromFile("D:\\copy\\ind.png", document);
  70.             PDPageContentStream contents = new PDPageContentStream(document, page,
  71.                     PDPageContentStream.AppendMode.PREPEND, true, true);
  73.             contents.saveGraphicsState();
  74.             // 在PDF文档中绘制图像
  75.             contents.drawImage(pdImage, 0, 0, 50, 30);
  76.             contents.restoreGraphicsState();
  78.             System.out.println("成功插入图像。");
  80.             // 关闭 PDPageContentStream 对象
  81.             contents.close();
  83.         }
  85.         document.save("RemoveImage.pdf");
  86.         document.close();
  87.     }
  88. }

请帮忙解决这个问题。
同时，期待关于其他代码审查意见，以使此操作正常运行。 PDFBox删除图像后出现错误 – 此页面存在错误。Acrobat可能无法正确显示页面。

  2. [1]: https://i.stack.imgur.com/VJaec.png
  3. <details>
  4. <summary>英文:</summary>
  5. I am using the pdfbox library 2.0 version. I have to remove the selected image from the page and add another image. It works properly. But when I open that file it shows a warning message: ***An error exists on this page. Acrobat may not display the page correctly***. and the screenshot is as below: 
  6. ![Error Image][1]
  7. Herewith sharing the code to delete an image and add other image:**(EDITTED with Fix)**
  8. public static void removeImages(String pdfFile) throws Exception {
  9. PDDocument document = PDDocument.load(new File(pdfFile));
  10. for (PDPage page : document.getPages()) {
  11. PDResources pdResources = page.getResources();
  12. String[] qrCodeCosName = new String[1];
  13. pdResources.getXObjectNames().forEach(propertyName -&gt; {
  14. if (!pdResources.isImageXObject(propertyName)) {
  15. return;
  16. }
  17. PDXObject o;
  18. try {
  19. o = pdResources.getXObject(propertyName);
  20. if (o instanceof PDImageXObject) {
  21. PDImageXObject pdImageXObject = (PDImageXObject) o;
  22. if (pdImageXObject.getMetadata() != null) {
  23. // TO REMOVE FROM RESOURCE
  24. ((COSDictionary) pdResources.getCOSObject().getDictionaryObject(COSName.XOBJECT))
  25. .removeItem(propertyName);
  26. qrCodeCosName[0] = propertyName.getName();
  27. }
  28. }
  29. } catch (IOException e) {
  30. e.printStackTrace();
  31. }
  32. });
  33. PDFStreamParser parser = new PDFStreamParser(page);
  34. parser.parse();
  35. List&lt;Object&gt; tokens = parser.getTokens();
  36. System.out.println(&quot;Original tokens size&quot; + tokens.size());
  37. List&lt;Object&gt; newTokens = new ArrayList&lt;Object&gt;();
  38. for (int j = 0; j &lt; tokens.size(); j++) {
  39. Object token = tokens.get(j);
  40. if (token instanceof Operator) {
  41. Operator op = (Operator) token;
  42. // find image - remove it
  43. if (op.getName().equals(&quot;Do&quot;)) {
  44. COSName cosName = (COSName) tokens.get(j - 1);
  45. if (cosName.getName().equals(qrCodeCosName[0])) {
  46. newTokens.remove(newTokens.size() - 1);
  47. continue;
  48. }
  49. }
  50. newTokens.add(token);
  51. }
  52. System.out.println(&quot;tokens size&quot; + newTokens.size());
  53. PDStream newContents = new PDStream(document);
  54. OutputStream out = newContents.createOutputStream();
  55. ContentStreamWriter writer = new ContentStreamWriter(out);
  56. writer.writeTokens(newTokens);
  57. out.close();
  58. page.setContents(newContents);
  59. // ADD OTHER IMAGE
  60. PDImageXObject pdImage = PDImageXObject.createFromFile(&quot;D:\\copy\\ind.png&quot;, document);
  61. PDPageContentStream contents = new PDPageContentStream(document, page,
  62. PDPageContentStream.AppendMode.PREPEND, true, true);
  63. contents.saveGraphicsState();
  64. // Drawing the image in the PDF document
  65. contents.drawImage(pdImage, 0, 0, 50, 30);
  66. contents.restoreGraphicsState();
  67. System.out.println(&quot;Image inserted Successfully.&quot;);
  68. // Closing the PDPageContentStream object
  69. contents.close();
  70. }
  71. document.save(&quot;RemoveImage.pdf&quot;);
  72. document.close();
  73. }
  74. }
  75. Kindly help me with this.
  76. **Also, looking forward for other code review comments about required changes to make this operation properly.** :)
  77. [1]: https://i.stack.imgur.com/VJaec.png
  78. </details>
  79. # 答案1
  80. **得分**: 1
  81. 根据@Tilman Hausherr的建议，以下代码适用于我：
  82. ```java
  83. public static void removeImages(String pdfFile) throws Exception {
  84. PDDocument document = PDDocument.load(new File(pdfFile));
  85. for (PDPage page : document.getPages()) {
  86. PDResources pdResources = page.getResources();
  87. String[] qrCodeCosName = new String[1];
  88. pdResources.getXObjectNames().forEach(propertyName -> {
  89. if (!pdResources.isImageXObject(propertyName)) {
  90. return;
  91. }
  92. PDXObject o;
  93. try {
  94. o = pdResources.getXObject(propertyName);
  95. if (o instanceof PDImageXObject) {
  96. PDImageXObject pdImageXObject = (PDImageXObject) o;
  97. if (pdImageXObject.getMetadata() != null) {
  98. // TO REMOVE FROM RESOURCE
  99. ((COSDictionary) pdResources.getCOSObject().getDictionaryObject(COSName.XOBJECT))
  100. .removeItem(propertyName);
  101. qrCodeCosName[0] = propertyName.getName();
  102. }
  103. }
  104. } catch (IOException e) {
  105. e.printStackTrace();
  106. }
  107. });
  108. PDFStreamParser parser = new PDFStreamParser(page);
  109. parser.parse();
  110. List<Object> tokens = parser.getTokens();
  111. System.out.println("Original tokens size" + tokens.size());
  112. List<Object> newTokens = new ArrayList<Object>();
  113. for (int j = 0; j < tokens.size(); j++) {
  114. Object token = tokens.get(j);
  115. if (token instanceof Operator) {
  116. Operator op = (Operator) token;
  117. // find image - remove it
  118. if (op.getName().equals("Do")) {
  119. COSName cosName = (COSName) tokens.get(j - 1);
  120. if (cosName.getName().equals(qrCodeCosName[0])) {
  121. newTokens.remove(newTokens.size() - 1);
  122. continue;
  123. }
  124. }
  125. newTokens.add(token);
  126. }
  127. System.out.println("tokens size" + newTokens.size());
  128. PDStream newContents = new PDStream(document);
  129. OutputStream out = newContents.createOutputStream();
  130. ContentStreamWriter writer = new ContentStreamWriter(out);
  131. writer.writeTokens(newTokens);
  132. out.close();
  133. page.setContents(newContents);
  134. // ADD OTHER IMAGE
  135. PDImageXObject pdImage = PDImageXObject.createFromFile("D:\\copy\\ind.png", document);
  136. PDPageContentStream contents = new PDPageContentStream(document, page,
  137. PDPageContentStream.AppendMode.PREPEND, true, true);
  138. contents.saveGraphicsState();
  139. // Drawing the image in the PDF document
  140. contents.drawImage(pdImage, 0, 0, 50, 30);
  141. contents.restoreGraphicsState();
  142. System.out.println("Image inserted Successfully.");
  143. // Closing the PDPageContentStream object
  144. contents.close();
  145. }
  146. document.save("RemoveImage.pdf");
  147. document.close();
  148. }
  149. }
英文:

As per @Tilman Hausherr suggestion below code works for me:

  1. public static void removeImages(String pdfFile) throws Exception {
  2. PDDocument document = PDDocument.load(new File(pdfFile));
  3. for (PDPage page : document.getPages()) {
  4. PDResources pdResources = page.getResources();
  5. String[] qrCodeCosName = new String[1];
  6. pdResources.getXObjectNames().forEach(propertyName -&gt; {
  7. if (!pdResources.isImageXObject(propertyName)) {
  8. return;
  9. }
  10. PDXObject o;
  11. try {
  12. o = pdResources.getXObject(propertyName);
  13. if (o instanceof PDImageXObject) {
  14. PDImageXObject pdImageXObject = (PDImageXObject) o;
  15. if (pdImageXObject.getMetadata() != null) {
  16. // TO REMOVE FROM RESOURCE
  17. ((COSDictionary) pdResources.getCOSObject().getDictionaryObject(COSName.XOBJECT))
  18. .removeItem(propertyName);
  19. qrCodeCosName[0] = propertyName.getName();
  20. }
  21. }
  22. } catch (IOException e) {
  23. e.printStackTrace();
  24. }
  25. });
  26. PDFStreamParser parser = new PDFStreamParser(page);
  27. parser.parse();
  28. List&lt;Object&gt; tokens = parser.getTokens();
  29. System.out.println(&quot;Original tokens size&quot; + tokens.size());
  30. List&lt;Object&gt; newTokens = new ArrayList&lt;Object&gt;();
  31. for (int j = 0; j &lt; tokens.size(); j++) {
  32. Object token = tokens.get(j);
  33. if (token instanceof Operator) {
  34. Operator op = (Operator) token;
  35. // find image - remove it
  36. if (op.getName().equals(&quot;Do&quot;)) {
  37. COSName cosName = (COSName) tokens.get(j - 1);
  38. if (cosName.getName().equals(qrCodeCosName[0])) {
  39. newTokens.remove(newTokens.size() - 1);
  40. continue;
  41. }
  42. }
  43. newTokens.add(token);
  44. }
  45. System.out.println(&quot;tokens size&quot; + newTokens.size());
  46. PDStream newContents = new PDStream(document);
  47. OutputStream out = newContents.createOutputStream();
  48. ContentStreamWriter writer = new ContentStreamWriter(out);
  49. writer.writeTokens(newTokens);
  50. out.close();
  51. page.setContents(newContents);
  52. // ADD OTHER IMAGE
  53. PDImageXObject pdImage = PDImageXObject.createFromFile(&quot;D:\\copy\\ind.png&quot;, document);
  54. PDPageContentStream contents = new PDPageContentStream(document, page,
  55. PDPageContentStream.AppendMode.PREPEND, true, true);
  56. contents.saveGraphicsState();
  57. // Drawing the image in the PDF document
  58. contents.drawImage(pdImage, 0, 0, 50, 30);
  59. contents.restoreGraphicsState();
  60. System.out.println(&quot;Image inserted Successfully.&quot;);
  61. // Closing the PDPageContentStream object
  62. contents.close();
  63. }
  64. document.save(&quot;RemoveImage.pdf&quot;);
  65. document.close();
  66. }
  67. }

huangapple
  • 本文由 发表于 2020年10月23日 15:14:13
  • 转载请务必保留本文链接：https://go.coder-hub.com/64495532.html
  • java
  • pdfbox
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