Apache POI - Working with XSSFWorkbok + servlet response

问题

I'm having problems in my java application to enable downloading XLSX files.

following the example displayed in this link: Create an excel file for users to download using Apache POI, I tried two configurations to download/save a spreadsheet.

First with a .XLS file:

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();

This works.

Then i tried with a XLSX file:

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();

When i try this, i receive the message: "Excel found unreadable content in 'testxls.xlsx'. Do you want to recover the contents of this workbook? ...."

Despite this message, the spreadsheet opens normally, but i really want to remove this message.

Any ideas?

回答1:

Use this JSP code and generate the excel file succesfully.I have given input to excel file through the database you can also give manual inputs.

<%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();

    %>

来源：https://stackoverflow.com/questions/15387243/apache-poi-working-with-xssfworkbok-servlet-response