poi excel content-Type

The content-Type of a POI Excel file refers to the type of data contained within the file. This information is necessary for web servers and browsers to properly interpret and display the file.

The content-Type for a POI Excel file is typically "application/vnd.ms-excel" or "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" for older and newer versions of Microsoft Excel, respectively. This tells the browser that the file is an Excel spreadsheet and how to open it.

Other content-Types for Excel files may include "application/octet-stream" or "application/x-download", which indicate that the file should be downloaded rather than displayed in the browser.

相关问题

poi excel content-Type设置

在使用POI操作Excel文件时，可以通过设置Content-Type来指定生成的Excel文件的类型。具体步骤如下：

1. 导入相关包

import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;

2. 在Controller中设置Content-Type

@RequestMapping("/downloadExcel")
public void downloadExcel(HttpServletResponse response) {
    try {
        //创建Workbook对象
        Workbook workbook = new XSSFWorkbook();
        //Workbook workbook = new HSSFWorkbook();

        //设置Content-Type
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        //response.setContentType("application/vnd.ms-excel");

        //设置文件名
        response.setHeader("Content-Disposition", "attachment;filename=test.xlsx");
        //response.setHeader("Content-Disposition", "attachment;filename=test.xls");

        //将Workbook写入OutputStream
        OutputStream outputStream = response.getOutputStream();
        workbook.write(outputStream);
        outputStream.flush();
        outputStream.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

其中，Content-Type分别为application/vnd.openxmlformats-officedocument.spreadsheetml.sheet和application/vnd.ms-excel，分别对应xlsx和xls格式的Excel文件。

需要注意的是，在使用XSSFWorkbook时，Content-Type应该设置为application/vnd.openxmlformats-officedocument.spreadsheetml.sheet；在使用HSSFWorkbook时，Content-Type应该设置为application/vnd.ms-excel。

No converter for [class java.util.LinkedHashMap] with preset Content-Type 'application/vnd.ms-excel'

这个错误通常是因为在使用某些库或框架时，尝试将一个Java对象转换为Excel文件时出现的。

你可以尝试使用专门的Java库，如Apache POI或jExcelApi来处理Excel文件。这些库可以让你更容易地创建、读取和修改Excel文件，同时也提供了更多的配置选项。

如果你已经在使用这些库或框架，并且仍然遇到此错误，那么可能需要检查你的代码是否正确地使用了这些库，并且是否正确地设置了Content-Type。你可以检查文档或者寻求相关的帮助来解决此问题。