java导出excel 提示文件格式或文件扩展名有误

不同格式的文件响应不同的链接类型.

XLSX文件格式的下载 

("application/ ");

public static String export2Web4File(HttpServletResponse response, String path, String excelName) throws UnsupportedEncodingException {
    File file = new File((excelName).concat(()));
    if (!()) {
        return "文件不存在！";
    }

    ("application/");
    ("utf-8");
    // 这里可以防止中文乱码
    excelName = (excelName, "UTF-8");
    excelName = new String(new String(excelName + ()).getBytes(), "ISO8859-1");
    ("Content-disposition", "attachment;filename=" + excelName);
    ("Access-Control-Expose-Headers","Content-disposition");
    try (
            FileInputStream in = new FileInputStream(file);
            ServletOutputStream out = ();
    ) {
        (in, out);
        return "导出成功！";
    } catch (Exception e) {
        ("导出文件异常：", e);
    }

    return "导出失败！";
} 

 XLS文件格式的下载 

("application/-excel");

public static String export2Web4FileList(HttpServletResponse response, String path, String excelName,List data) throws UnsupportedEncodingException {
        File file = new File((excelName).concat(()));
        if (!()) {
            return "文件不存在！";
        }
        ("application/-excel");
        ("utf-8");
        // 这里可以防止中文乱码
        excelName = (excelName, "UTF-8");
        excelName = new String(new String(excelName + ()).getBytes(), "ISO8859-1");
        ("Content-disposition", "attachment;filename=" + excelName);
        ("Access-Control-Expose-Headers","Content-disposition");
        try {
            ExcelWriter excelWriter = (()).withTemplate(()).build();
            WriteSheet writeSheet = ().build();
            if ((data)) {
                (data, writeSheet);
            }
            ();
            return "导出成功！";
        } catch (Exception e) {
            ("导出文件异常：", e);
        }

        return "导出失败！";
    }