java - XSSFWorkbook 问题 - 创建新文件时

Question

我在创建新的 xlsx 文件时遇到 XSSFWorkbook api 问题。

场景:我的 gui 菜单中有一个菜单项“新建文件”，它从流创建新的 xlsx 文件。第一次当我单击菜单项“新建文件”时，会出现文件新对话框，我给出新 xlsx 文件的名称，然后创建新文件。但是当我第二次单击此菜单项“新建文件”时，不会创建新的 xlsx。

//Code snippet

File newOpenXLSFile;
public XSSFWorkbook newPtrIrWorkBook;

newPtrIrStream = this.getClass().getResourceAsStream ("/org/ama/defect/prevention/templates/MainTemplate.xlsx");


private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {                                           
    // TODO add your handling code here:
    logger.debug("You choose to create new PTR/IR file");
    int returnVal = jFileChooser4.showDialog(this, "New PTR/IR Data File");

    if (returnVal == JFileChooser.APPROVE_OPTION) {

        newOpenXLSFile = jFileChooser4.getSelectedFile();
        logger.debug("file path " + newOpenXLSFile);
        try {
             logger.debug("For second time, I am stopped here:");
             //newPtrIrWorkBook = new HSSFWorkbook(newPtrIrPFS, true); //copying extract into Excel file       
            newPtrIrWorkBook = new XSSFWorkbook(newPtrIrStream);
            logger.debug("New File..." + newOpenXLSFile.getPath());
            FileOutputStream out = new FileOutputStream(newOpenXLSFile);
            newPtrIrWorkBook.write(out);
            out.close();
        } catch (Exception e) {
            e.getMessage();
        }
    } else {
        logger.debug("New file dialogue cancelled by user.");
    }

}

我猜它第二次在代码语句中阻塞:

logger.debug("For second time, I am stopped here:"); 
//newPtrIrWorkBook = new HSSFWorkbook(newPtrIrPFS, true);//copying extract into
//Excel file     
---> newPtrIrWorkBook = new XSSFWorkbook(newPtrIrStream);  <---

调试日志:

2011-08-18 13:04:37,602 [AWT-EventQueue-0] DEBUG org.ama.defect.prevention.tool.gui.GUI.class - You choose to create new PTR/IR file
2011-08-18 13:04:45,586 [AWT-EventQueue-0] DEBUG org.ama.defect.prevention.tool.gui.GUI.class - file path C:\Documents and Settings\rmehta\Desktop\Try\FirstFile.xlsx
2011-08-18 13:04:45,586 [AWT-EventQueue-0] DEBUG org.ama.defect.prevention.tool.gui.GUI.class - For second time, I am stopped here:
2011-08-18 13:04:46,351 [AWT-EventQueue-0] DEBUG org.ama.defect.prevention.tool.gui.GUI.class - New File...C:\Documents and Settings\rmehta\Desktop\Try\FirstFile.xlsx

2011-08-18 13:04:52,898 [AWT-EventQueue-0] DEBUG org.ama.defect.prevention.tool.gui.GUI.class - You choose to create new PTR/IR file
2011-08-18 13:04:57,116 [AWT-EventQueue-0] DEBUG org.ama.defect.prevention.tool.gui.GUI.class - file path C:\Documents and Settings\rmehta\Desktop\Try\SecondFile.xlsx
2011-08-18 13:04:57,116 [AWT-EventQueue-0] DEBUG org.ama.defect.prevention.tool.gui.GUI.class - For second time, I am stopped here:

你能帮我解决这个问题吗？但是，对于 HSSFWorkbook(对于 xls 文件)来说效果很好。

非常感谢，

拉胡尔

Answer 1

使用调试器发现了问题:

java.io.IOException: Stream closed

问题似乎是:流只能读取一次，第二次尝试读取将导致此 IOException。

为了解决这个问题，我把

newPtrIrStream = this.getClass()
  .getResourceAsStream("/org/ama/defect/prevention/templates/MainTemplate.xlsx");

在jMenuItem1ActionPerformed内并解决了问题。