Apache poi word文檔空指針異常

我已經在word文檔中寫了一個字符串。但是，當我打開文檔來獲取字符串並將其存儲在另一個文檔中時，它給了我例外。Apache poi word文檔空指針異常

這是我的代碼。

XWPFDocument document = new XWPFDocument(); 
    XWPFParagraph paragraphOne = document.createParagraph(); 
    XWPFRun paragraphOneRunOne = paragraphOne.createRun(); 
    paragraphOneRunOne.setBold(true); 
    paragraphOneRunOne.setItalic(true); 
    paragraphOneRunOne.setText("Hello world! This is paragraph one!"); 
    paragraphOneRunOne.addBreak(); 


    FileOutputStream outStream = null; 
    try { 
     outStream = new FileOutputStream("MyDov.docx"); 
     document.write(outStream); 
     outStream.close(); 
    } catch (FileNotFoundException e) { 
     e.printStackTrace(); 
    } 

    try{ 
    FileInputStream is = new FileInputStream(new File("MyDov.docx")); 
     XWPFDocument doc = new XWPFDocument(is); //Document with words 
     XWPFWordExtractor ex = new XWPFWordExtractor(doc); //To get the words 
     String words = ex.getText(); 

     XWPFDocument newDoc = new XWPFDocument(); //Doc to write new doc to 
    XWPFParagraph para = newDoc.createParagraph(); //Paragraph 
    XWPFRun run = para.createRun();  
      run.setText(words); 
       } 
     newDoc.write(new FileOutputStream(new File("mydoc.docx")));} 
    catch (IOException e) 
    {System.out.println(e);}

它給了我這個例外。

Exception in thread "main" java.lang.NullPointerException 
    at org.apache.poi.xwpf.extractor.XWPFWordExtractor.extractHeaders(XWPFWordExtractor.java:162) 
    at org.apache.poi.xwpf.extractor.XWPFWordExtractor.getText(XWPFWordExtractor.java:87) 
    at atestpack.CreateDocumentFromScratch.main(CreateDocumentFromScratch.java:56) 

How can I solve this exception?

來源

2013-11-04 Sarah

您正在編寫您的文檔，然後立即閱讀它。您是否嘗試檢查該文件是否正常？您是否嘗試用MS word兼容的應用程序打開它？您是否嘗試閱讀* other *，絕對有效的單詞文檔？ – AlexR

是這個文件還行有一句寫着Hello world的句子！這是第一段！我用寫字板打開了它。我已閱讀通過代碼創建我的其他文檔。 – Sarah

因此，請附上POI的來源，並嘗試通過調試器瀏覽堆棧。堆棧跟蹤不太深，你會很容易看到爲什麼NPE被拋出。 – AlexR

我不確定它是否與你正在寫的文件，但是當你檢索文本似乎希望你通過一段做一段的方式做。在下面，我已經從文檔中檢索了每個段落，通過它們循環檢索文本，然後按照需要寫出它。我已經評論了我改變如下：

public class SO3 { 
public static void main(String[] args){ 

XWPFDocument document = new XWPFDocument(); 
XWPFParagraph paragraphOne = document.createParagraph(); 
XWPFRun paragraphOneRunOne = paragraphOne.createRun(); 
paragraphOneRunOne.setBold(true); 
paragraphOneRunOne.setItalic(true); 
paragraphOneRunOne.setText("Hello world! This is paragraph one!"); 
paragraphOneRunOne.addBreak(); 

try { 
    FileOutputStream outStream = new FileOutputStream("D:\\Users\\user2777005\\Desktop\\MyDov.docx"); 
    document.write(outStream); 
    outStream.close(); 
} catch (IOException e) { 
    e.printStackTrace(); 
} 

try{ 
FileInputStream is = new FileInputStream(new File("D:\\Users\\user2777005\\Desktop\\MyDov.docx")); 

XWPFDocument doc = new XWPFDocument(is); 
List<XWPFParagraph> paras = doc.getParagraphs(); //This list will hold the paragraphs 
XWPFWordExtractor ex = new XWPFWordExtractor(doc); //To get the words 
String words = ""; //This will hold all the text 
    for(XWPFParagraph p : paras){ //For each paragraph we retrieved from the document 
     words += p.getText(); //Add the text we retrieve to the words string 
    } 

    System.out.println(words); //Check out string 
    XWPFDocument newDoc = new XWPFDocument(); 
    XWPFParagraph para = newDoc.createParagraph(); 
    XWPFRun run = para.createRun();  
    //You have to reformat the run with bold/italic e.t.c if you want 
    run.setText(words); 
    newDoc.write(new FileOutputStream(new File("D:\\Users\\user2777005\\Desktop\\mydoc.docx")));} 
    catch (IOException e) 
{System.out.println(e);} 
}}

祝你好運！

來源

2013-11-04 09:22:30 Levenal

謝謝你的工作:) – Sarah

Apache poi word文檔空指針異常

回答

相關問題