尝试打开 Excel 工作簿时出现错误时，Try/Catch 不会激活答案

【问题标题】：Try/Catch doesn't activate on an error trying to open excel Workbook尝试打开 Excel 工作簿时出现错误时，Try/Catch 不会激活
【发布时间】：2019-02-12 00:46:34
【问题描述】：

使用 apache-POI 打开一个 Excel 工作簿，如果它不存在则创建一个。由于某种原因，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，围绕这部分代码的 try/catch 似乎没有激活。任何想法为什么，以及如何正确处理这些错误？另外，有没有办法在我的if(file.exists() && file.length() != 0) {有条件的时候检查文件的完整性？

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;
      }
}

【问题讨论】：

你得到了什么异常？

标签： java excel error-handling apache-poi

【解决方案1】：

试试这段代码，它会给你一个错误 “打开 random.xlx 文件时出错，正在创建空白”，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分。

【讨论】：