Apache POI - 使用 XSSFWorkbok + servlet 响应

Question

我在 Java 应用程序中遇到问题，无法下载 XLSX 文件。

按照此链接中显示的示例：使用 Apache POI 创建供用户下载的 excel 文件，我尝试了两种配置来下载/保存电子表格。

首先使用 .XLS 文件：

response.setContentType("application/ms-excel");
response.setHeader("Content-Disposition", "attachment; filename=testxls.xls");

HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet();
HSSFRow row = sheet.createRow(0);
HSSFCell cell = row.createCell(0);
cell.setCellValue("Some text");

ByteArrayOutputStream outByteStream = new ByteArrayOutputStream();
wb.write(outByteStream);

byte[] outArray = outByteStream.toByteArray();
OutputStream outStream = response.getOutputStream();
outStream.write(outArray);
outStream.flush();

这有效。

然后我尝试使用 XLSX 文件：

response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.setHeader("Content-Disposition", "attachment; filename=testxls.xlsx");

XSSFWorkbook wb = new XSSFWorkbook();
XSSFSheet sheet = wb.createSheet();
XSSFRow row = sheet.createRow(0);
XSSFCell cell = row.createCell(0);
cell.setCellValue("Some text");

ByteArrayOutputStream outByteStream = new ByteArrayOutputStream();
wb.write(outByteStream);

byte[] outArray = outByteStream.toByteArray();
OutputStream outStream = response.getOutputStream();
outStream.write(outArray);
outStream.flush();

当我尝试此操作时，我收到消息：“ Excel 在 'testxls.xlsx' 中发现无法读取的内容。您想恢复此工作簿的内容吗？.... ”

尽管有这条消息，电子表格正常打开，但我真的想删除这条消息。

有任何想法吗？

Answer 1

使用此JSP代码并成功生成excel文件。我已经通过数据库向excel文件提供了输入，您也可以手动输入。

<%HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet sheet = wb.createSheet();
       try {
        java.sql.Connection con;
        Class.forName("com.mysql.jdbc.Driver");
        con = DriverManager.getConnection("jdbc:mysql://localhost:3306/custinfo","root","abc");
            Statement st= con.createStatement(); 
            out.println("hello world");
        ResultSet rs=st.executeQuery("select name ,state ,balance,description from customerdata where customerid='"+Id+"'"); 

        HSSFRow row = sheet.createRow((short)0);
        row.createCell((short)0).setCellValue("NAME");
        row.createCell((short)1).setCellValue("STATE");
        row.createCell((short)2).setCellValue("BALANCE");
        row.createCell((short)3).setCellValue("DESCRIPTION");
        while(rs.next())
        {
             out.println("hello world data");       
            HSSFRow row1 = sheet.createRow((short)i);
            row1.createCell((short)0).setCellValue(rs.getString("name"));
            row1.createCell((short)1).setCellValue(rs.getString("state"));
         row1.createCell((short)2).setCellValue(rs.getString(3));
         row1.createCell((short)3).setCellValue(rs.getString(4));
         i=i+1;
        sheet.autoSizeColumn((short)1); 

        }

       }
      catch(SQLException e) {
        out.println("SQLException caught: " +e.getMessage());
      }%>
    // create a small spreadsheet
    <%

    %>
    <% 

    ByteArrayOutputStream outByteStream = new ByteArrayOutputStream();
    wb.write(outByteStream);
    byte [] outArray = outByteStream.toByteArray();
    response.setContentType("application/ms-excel");
    response.setContentLength(outArray.length);
    response.setHeader("Expires:", "0"); // eliminates browser caching
    response.setHeader("Content-Disposition", "attachment; filename=testxls.xls");
    OutputStream outStream = response.getOutputStream();
    outStream.write(outArray);
    outStream.flush();

    %>