在grails中加密xls文件并下载

Question

我需要下载带密码或加密的 xls 文件。

import org.apache.poi.hssf.usermodel.HSSFWorkbook
import com.emmanuelrosa.frostedsheets.* 

def downloadxls(){
 /*
  * Creates a workbook with Apache POI and decorates it
  * with Frosted Sheets.
  */
    response.setContentType('application/vnd.ms-excel')
    response.setHeader('Content-Disposition', 'Attachment;Filename="data.xls"')

    // response.setContentType("APPLICATION/OCTET-STREAM")
    //  response.setHeader('Content-Disposition', 'Attachment;Filename="archivo.buf"')

    def outputStream = response.getOutputStream()
    def workbook = new FrostedWorkbook(new HSSFWorkbook())

    workbook['Students'].with {
        append(['First Name', 'Last Name', 'Age'])
        append(['John', 'Doe', '20'])
        append(['Jane', 'Smith', '18'])
    }

    workbook['Courses'].with {
        append(['Course Name', 'Number of Units'])
        append(['Algebra', 3])
        append(['English Grammar', 5])
    }
   /*
   * workbook is an instance of FrostedWorkbook, 
   * which implements the Workbook interface.
   * The writeProtectWorkbook() method is provided
   * by HSSFWorkbook (it's not in the interface).
   * FrostedWorkbook.workbook is the decorated HSSFWorkbook
   */

    workbook.workbook.writeProtectWorkbook('password', 'user')

    workbook.write(response.outputStream)
    outputStream << workbook

    outputStream.flush()

文件下载code.with这段代码我可以下载.xls文件，但即使你添加所有数据仍然没有加密。

    outputStream.close()

}

问题是您下载的文件没有加密。

Answer 1

您正在尝试使用两个库来创建您的 Excel 工作簿：JXL 和 Apache POI。他们对彼此一无所知。所以 JXL 忽略了密码。

Excel 工作簿密码保护

加密和密码保护是有区别的。两者都使用密码，但 密码保护 不加密文件。该文件仍然可以读取，但不能修改。

这是一个显示如何 password-protect 工作簿的示例。我正在使用我的库 Frosted Sheets，它是 Apache POI 的便捷包装器。

import org.apache.poi.hssf.usermodel.HSSFWorkbook
import com.emmanuelrosa.frostedsheets.* 

/*
 * Creates a workbook with Apache POI and decorates it
 * with Frosted Sheets.
 */
def workbook = new FrostedWorkbook(new HSSFWorkbook())

workbook['Students'] << [
    ['First Name', 'Last Name', 'Age'],
    ['John', 'Doe', '20'],
    ['Jane', 'Smith', '18']
]

workbook['Courses'] << [
    ['Course Name', 'Number of Units'],
    ['Algebra', 3],
    ['English Grammar', 5]
]

/*
 * workbook is an instance of FrostedWorkbook, 
 * which implements the Workbook interface.
 * The writeProtectWorkbook() method is provided
 * by HSSFWorkbook (it's not in the interface).
 * FrostedWorkbook.workbook is the decorated HSSFWorkbook
 */
workbook.workbook.writeProtectWorkbook('password', 'user')
workbook.write(response.outputStream)

Excel 工作簿加密

FrostedSheets 现在为 XLSX 工作簿提供加密。您只需要使用 0.3.0 或更高版本：

import com.emmanuelrosa.frostedsheets.* 

/*
 * Creates an XLSX workbook with Apache POI and decorates it
 * with Frosted Sheets.
 */
def workbook = FrostedWorkbook.createXLSX()

workbook['Students'] << [
    ['First Name', 'Last Name', 'Age'],
    ['John', 'Doe', '20'],
    ['Jane', 'Smith', '18'],
]

workbook['Courses'] << [
    ['Course Name', 'Number of Units'],
    ['Algebra', 3],
    ['English Grammar', 5]
]
    
workbook.writeEncrypted(outputStream: response.outputStream, password: 'password')

警告：在加密过程中，工作簿以未加密的方式写出到临时存储。默认为字节数组 (RAM)，但也可以使用临时文件。

此外，请确保将响应 header 中的文件扩展名更改为 xlsx。

在grails中加密xls文件并下载

encrypt xls file in grails and download

grails

groovy

apache-poi

password-encryption

Excel 工作簿密码保护

Excel 工作簿加密