尝试在JAVA中将数据写入多个工作表时，XLSX文件损坏

Question

我是JAVA的新手。我要求将特定文件夹中的多个文件加载到excel xlsx（不是xls文件，因为输入文件的记录超过65k）文件不同。下面是我写的代码。 xlsx文件已损坏，无法打开。你能帮忙吗？

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

               File folder = new File("C:/txttoxls/");
            File[] listOfFiles = folder.listFiles();
                  XSSFWorkbook workbook=new XSSFWorkbook();

            for (File file : listOfFiles) {


   if (file.isFile()) {

       String thisline;
       ArrayList<String> al = null;
       ArrayList<ArrayList<String>> arlist = new ArrayList<ArrayList<String>>();

       XSSFSheet sheet =  workbook.createSheet(file.getName());  
           FileInputStream fis = new FileInputStream(file);
           System.out.println("Got here");
           BufferedReader br = new BufferedReader(new InputStreamReader(fis));

           while ((thisline = br.readLine()) != null) {
               al = new ArrayList<String>();
               String strar[] = thisline.split("#");

               for (int j = 0; j < strar.length; j++) { 
                   for (int k = 0; k < arlist.size(); k++) {

                       ArrayList<String> ardata = (ArrayList<String>) arlist.get(k);

                       XSSFRow row = sheet.createRow((short) k);


                       for (int p = 0; p < ardata.size(); p++) {

                           XSSFCell cell = row.createCell((short) p);
                           cell.setCellValue(ardata.get(p).toString());

                       }
                   }

                   al.add(strar[j]);

               } 

             arlist.add(al);
           }

           fis.close();  
           FileOutputStream fileOut = new FileOutputStream("C:/txttoxls/Test.xlsx");
           workbook.write(fileOut);
           fileOut.flush();
           fileOut.close();
           br.close();
   }
   }

           System.out.println("Your excel file has been generated!");

            } catch ( Exception ex ) {
                 System.out.println(ex);

                }
                }
  }

编辑于4月27日：工作代码但存在性能问题。

 import java.io.*;
 import java.util.ArrayList; 
 import org.apache.poi.xssf.usermodel.XSSFSheet;
 import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 import org.apache.poi.xssf.usermodel.XSSFRow;
 import org.apache.poi.xssf.usermodel.XSSFCell;


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

    XSSFWorkbook workbook=new XSSFWorkbook();
    XSSFSheet sheet = (XSSFSheet) workbook.createSheet("sheet1");  
    XSSFSheet sheet1 = (XSSFSheet) workbook.createSheet("Sheet2");
    try{

           File file = new File("C:/Users/Desktop/file1.txt");

          FileOutputStream fileOut = new FileOutputStream("C:/Users/Desktop/test.xlsx");

      if (file.isFile()) {

       String thisline;
       ArrayList<String> al = null;
       ArrayList<ArrayList<String>> arlist = new ArrayList<ArrayList<String>>();


           FileInputStream fis = new FileInputStream(file);
           System.out.println("loading 1st file");
           BufferedReader br = new BufferedReader(new InputStreamReader(fis));

           while ((thisline = br.readLine()) != null) {
               al = new ArrayList<String>();
               String strar[] = thisline.split("#");

               for (int j = 0; j < strar.length; j++) { 
                   for (int k = 0; k < arlist.size(); k++) {

                       ArrayList<String> ardata = (ArrayList<String>) arlist.get(k);

                       XSSFRow row = sheet.createRow((short) k);


                       for (int p = 0; p < ardata.size(); p++) {

                           XSSFCell cell = row.createCell((short) p);
                           cell.setCellValue(ardata.get(p).toString());

                       }
                   }

                   al.add(strar[j]);

               } 

             arlist.add(al);
           }

           fis.close();  

      }
      File file1 = new File("C:/Users/Desktop/file2.txt");
      if (file1.isFile()) {

          String thisline;
          ArrayList<String> al = null;
          ArrayList<ArrayList<String>> arlist = new ArrayList<ArrayList<String>>();


              FileInputStream fis = new FileInputStream(file1);
              System.out.println("loading 2nd file");
              BufferedReader br = new BufferedReader(new InputStreamReader(fis));

              while ((thisline = br.readLine()) != null) {
                  al = new ArrayList<String>();
                  String strar[] = thisline.split("#");

                  for (int j = 0; j < strar.length; j++) { 
                      for (int k = 0; k < arlist.size(); k++) {

                          ArrayList<String> ardata = (ArrayList<String>) arlist.get(k);

                          XSSFRow row = sheet1.createRow((short) k);


                          for (int p = 0; p < ardata.size(); p++) {

                              XSSFCell cell = row.createCell((short) p);
                              cell.setCellValue(ardata.get(p).toString());

                          }
                      }

                      al.add(strar[j]);

                  } 

                arlist.add(al);
              }

              fis.close();  
                             workbook.write(fileOut);
              fileOut.flush();
              fileOut.close();
              br.close();


      System.out.println("Your excel file has been generated!");


   }} catch ( Exception ex ) {
   System.out.println(ex);

  }

  }
 }

Answer 1

我唯一能看到的是你的工作表名称可能是个问题。

XSSFSheet sheet = workbook.createSheet(file.getName());

Excel工作表名称极其严格。最大长度为31，不允许使用许多特殊字符，包括/[]:\?等等。考虑编写“toWorksheetName”函数将文件名清理为合法的工作表名称。

您可以尝试的另一件事是尝试使用POI读取XLS。这可能有助于缩小问题范围。 Help is here，在“使用.xlsx文件”下。

旁注：您无需关闭fis;关闭br就足够了。 Close（）从装饰器传递到包装的流。这不会破坏任何东西。