Java Try/Catch不'；无法在尝试打开excel工作簿时激活

使用apache POI打开excel工作簿或创建一个不存在的工作簿。 由于某些原因，正在打开的工作簿已损坏，导致在带有错误注释的行上发生错误

不知何故，这段代码的try/catch似乎没有激活。你知道为什么，我怎样才能正确处理这些错误吗？ 此外，如果（file.exists（）&&file.length（）！=0）{有条件，是否有任何方法可以在my

期间检查文件的完整性

public XSSFWorkbook OpenWB(String directory, String name) {
      File file = new File(directory + "\\" + name + ".xlsx");
      FileInputStream fIP;

      if(file.exists() && file.length() != 0) {
        try {
            fIP = new FileInputStream(file);
            //Get the workbook instance for XLSX file 
             workbook = new XSSFWorkbook(fIP); //*********error occurs here**********
             fIP.close();
             System.out.println(name + ".xlsx file open successfully.");
             return workbook;
        } catch (IOException e) {
            e.printStackTrace();
             System.out.println("Error to open " + name + ".xlsx file, creating blank");
              //Create Blank workbook
              workbook = new XSSFWorkbook(); 
              Integer i = 0;
              while (file.isFile() && file.exists()) {
                  name = name.concat(i.toString());
                  file = new File(directory + "\\" + name + ".xlsx");
                  i++;
              }
              return workbook;
        }
      } else {
         System.out.println("Error to open " + name + ".xlsx file, creating blank");
          //Create Blank workbook
          workbook = new XSSFWorkbook(); 
          return workbook;
      }
}   

试试这段代码，它会给你一个错误
“打开random.xlx文件时出错，创建空白”，这意味着您的try-catch正在工作。您似乎忘记初始化变量“工作簿”

      package stackoverflow;
      import java.io.File;
      import java.io.FileInputStream;
      import java.io.IOException;

      import org.apache.poi.xssf.usermodel.XSSFWorkbook;

      public class Solution {
      public XSSFWorkbook OpenWB(String directory, String name) {
      File file = new File(directory + "\\" + name + ".xlsx");
      FileInputStream fIP;

      XSSFWorkbook workbook;
     if(file.exists() && file.length() != 0) {
        try {
            fIP = new FileInputStream(file);
            //Get the workbook instance for XLSX file 
             workbook = new XSSFWorkbook(fIP); //*********error occurs here**********
             fIP.close();
             System.out.println(name + ".xlsx file open successfully.");
             return workbook;
        } catch (IOException e) {
            e.printStackTrace();
             System.out.println("Error to open " + name + ".xlsx file, creating blank");
              //Create Blank workbook
              workbook = new XSSFWorkbook(); 
              Integer i = 0;
              while (file.isFile() && file.exists()) {
                  name = name.concat(i.toString());
                  file = new File(directory + "\\" + name + ".xlsx");
                  i++;
              }
              return workbook;
        }
      } else {
         System.out.println("Error to open " + name + ".xlsx file, creating blank");
          //Create Blank workbook
          workbook = new XSSFWorkbook(); 
          return workbook;
      }
}  
public static void main(String args[]) {
    Solution s = new Solution();
    s.OpenWB("D://", "random.xlx");
}
 }

您可以根据需要修改解决方案类部件。
试试这段代码，它会给您一个错误
“打开random.xlx文件时出错，创建空白”，这意味着您的try-catch正在工作。您似乎忘记初始化变量“工作簿”

      package stackoverflow;
      import java.io.File;
      import java.io.FileInputStream;
      import java.io.IOException;

      import org.apache.poi.xssf.usermodel.XSSFWorkbook;

      public class Solution {
      public XSSFWorkbook OpenWB(String directory, String name) {
      File file = new File(directory + "\\" + name + ".xlsx");
      FileInputStream fIP;

      XSSFWorkbook workbook;
     if(file.exists() && file.length() != 0) {
        try {
            fIP = new FileInputStream(file);
            //Get the workbook instance for XLSX file 
             workbook = new XSSFWorkbook(fIP); //*********error occurs here**********
             fIP.close();
             System.out.println(name + ".xlsx file open successfully.");
             return workbook;
        } catch (IOException e) {
            e.printStackTrace();
             System.out.println("Error to open " + name + ".xlsx file, creating blank");
              //Create Blank workbook
              workbook = new XSSFWorkbook(); 
              Integer i = 0;
              while (file.isFile() && file.exists()) {
                  name = name.concat(i.toString());
                  file = new File(directory + "\\" + name + ".xlsx");
                  i++;
              }
              return workbook;
        }
      } else {
         System.out.println("Error to open " + name + ".xlsx file, creating blank");
          //Create Blank workbook
          workbook = new XSSFWorkbook(); 
          return workbook;
      }
}  
public static void main(String args[]) {
    Solution s = new Solution();
    s.OpenWB("D://", "random.xlx");
}
 }

您可以根据需要修改解决方案类零件。
您会遇到什么异常？您会遇到什么异常？