iText7：com.itextpdf.kernel.PdfExctive：文档已关闭。无法执行操作

Question

我收到了com。itextpdf。内核PDFEException:文档已关闭。执行行动是不可能的 iText7上的错误。

1   // UPDATE FROM HERE             
2   PdfFont font;               
3   {               
4       GcsFilename gcsFilename = new GcsFilename("fonts", "msgothic001.ttf");          
5       try (GcsInputChannel inputChannel =         
6           gcsService.openPrefetchingReadChannel(gcsFilename, 0, BUFFER_SIZE)) {       
7           font =      
8               PdfFontFactory.createFont(  
9                   getBytes(Channels.newInputStream(inputChannel)),
10                  PdfEncodings.IDENTITY_H,
11                  true);
12      }           
13  }               
14  // UPDATE UNTIL HERE                
15                  
16  WriterProperties wp = new WriterProperties();               
17  wp.useSmartMode();              
18  try (PdfDocument writeDoc = new PdfDocument(new PdfWriter(outputStream, wp))) {             
19                  
20      List<Integer> keyList = Arrays.asList(Integer.valueOf(1), Integer.valueOf(2), Integer.valueOf(3));          
21      for (Integer keyNumber : keyList) {         
22          LOGGER.info(keyNumber);                                                   // (1)        
23          ByteArrayOutputStream baos = new ByteArrayOutputStream();       
24          try (PdfWriter writer = new PdfWriter(baos);        
25              PdfDocument readDoc =   
26                  new PdfDocument(new PdfReader(new ByteArrayInputStream(inputBytes)), writer)) {
27              PdfAcroForm pdfAcroForm = PdfAcroForm.getAcroForm(readDoc, false);  
28              Map<String, PdfFormField> fieldMap = pdfAcroForm.getFormFields();   
29              if (fieldMap != null && fieldMap.size() > 0) {      
30                  Set<String> fieldNameSet = new HashSet<>(fieldMap.keySet()); 
31                  for (String fieldName : fieldNameSet) {
32                      pdfAcroForm.renameField(fieldName, fieldName + "_" + keyNumber);
33                  }
34                  fieldMap = pdfAcroForm.getFormFields();
35              }   
36                  
37                  
38              // UPDATE FROM HERE 
39              PdfFormField form = fieldMap.get("Customer_" + keyNumber);              
40              form.setFont(font).setValue("Test Test");   
41              // UPDATE UNTIL HERE    
42                  
43          }                                           // (2) We got the error on this line        
44                  
45          try (PdfDocument readDoc =      
46              new PdfDocument(new PdfReader(new ByteArrayInputStream(baos.toByteArray())))) { 
47              readDoc.copyPagesTo(1, readDoc.getNumberOfPages(), writeDoc, new PdfPageFormCopier());  
48          }       
49      }           
50  }               

我得到了这个输出。

13:55:45.962 1      // (1)
13:55:47.252 2      // (1)
13:55:47.782 com.itextpdf.kernel.PdfException: Document was closed. It is impossible to execute action.
    at com.itextpdf.kernel.pdf.PdfDocument.checkClosingStatus(PdfDocument.java:1887)
    at com.itextpdf.kernel.pdf.PdfDocument.getWriter(PdfDocument.java:645)
    at com.itextpdf.kernel.pdf.PdfObject.makeIndirect(PdfObject.java:228)
    at com.itextpdf.kernel.pdf.PdfDictionary.makeIndirect(PdfDictionary.java:491)
    at com.itextpdf.kernel.pdf.PdfDictionary.makeIndirect(PdfDictionary.java:57)
    at com.itextpdf.kernel.pdf.PdfObject.makeIndirect(PdfObject.java:249)
    at com.itextpdf.kernel.pdf.PdfDictionary.makeIndirect(PdfDictionary.java:479)
    at com.itextpdf.kernel.pdf.PdfDictionary.makeIndirect(PdfDictionary.java:57)
    at com.itextpdf.kernel.font.PdfFont.makeObjectIndirect(PdfFont.java:600)
    at com.itextpdf.kernel.font.PdfType0Font.getFontDescriptor(PdfType0Font.java:672)
    at com.itextpdf.kernel.font.PdfType0Font.flushFontData(PdfType0Font.java:828)
    at com.itextpdf.kernel.font.PdfType0Font.flush(PdfType0Font.java:600)
    at com.itextpdf.kernel.pdf.PdfDocument.flushFonts(PdfDocument.java:1848)
    at com.itextpdf.kernel.pdf.PdfDocument.close(PdfDocument.java:800)
    at (our source (2) )

为什么我有这个错误？我如何修复？

[更新]我发现字体为“MS哥特式”（日文窗口上的标准字体）的设置值导致此错误。似乎有些字体会导致此错误，而有些字体则不会。我也尝试过HELVETICA，但它不会导致错误。我已经更新了我的程序（从第1行到第14行，从第38行到第41行）。




Answer 1

我已经复制了你的代码：

package com.itextpdf.samples;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import com.itextpdf.forms.PdfAcroForm;
import com.itextpdf.forms.PdfPageFormCopier;
import com.itextpdf.forms.fields.PdfFormField;
import com.itextpdf.io.font.FontProgram;
import com.itextpdf.io.font.FontProgramFactory;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.WriterProperties;

public class Test {

    public static void main(String[] args) throws IOException {
        FontProgram fontProgram = FontProgramFactory.createFont("c:/windows/fonts/msgothic.ttc,1");

        FileOutputStream outputStream = new FileOutputStream("test.pdf");
        WriterProperties wp = new WriterProperties();
        wp.useSmartMode();
        try (PdfDocument writeDoc = new PdfDocument(new PdfWriter(outputStream, wp))) {

            for (int keyNumber = 0; keyNumber < 3; keyNumber++) {
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                try (PdfWriter writer = new PdfWriter(baos);
                    PdfDocument readDoc =
                        new PdfDocument(new PdfReader("form.pdf"), writer)) {
                    PdfAcroForm pdfAcroForm = PdfAcroForm.getAcroForm(readDoc, false);
                    Map<String, PdfFormField> fieldMap = pdfAcroForm.getFormFields();
                    if (fieldMap != null && fieldMap.size() > 0) {    
                        Set<String> fieldNameSet = new HashSet<>(fieldMap.keySet()); 
                        for (String fieldName : fieldNameSet) {
                            pdfAcroForm.renameField(fieldName, fieldName + "_" + keyNumber);
                        }
                        fieldMap = pdfAcroForm.getFormFields();
                    }

                    PdfFormField form = fieldMap.get("name_" + keyNumber);              
                    form.setFont(PdfFontFactory.createFont(fontProgram)).setValue("Test Test");
                }


                try (PdfDocument readDoc =
                    new PdfDocument(new PdfReader(new ByteArrayInputStream(baos.toByteArray())))) {
                    readDoc.copyPagesTo(1, readDoc.getNumberOfPages(), writeDoc, new PdfPageFormCopier());
                }
            }
        }
    }
}

当我运行它时，它不会抛出任何错误。

我不得不做一些改变，因为我不知道像keyList这样的参数是关于什么的。你能执行我的例子，告诉我问题是否仍然存在吗？

• 如果我的示例仍然抛出一个错误：可能您没有使用最新版本的iText 7。请升级并重新尝试

更新：

当您创建一个PdfFont并且在PdfDocument的上下文中使用该PdfFont实例时，该PdfFont属于该文档，并且您不能再重用它。您应该为每个文档创建一个新的pdffort实例。但这并不意味着不能重用FontProgram。

我会更新我的例子。我使用FontProgramFactory创建FontProgram（我使用快速