Question

我需要使用密码或加密的xls文件DOWNLOAD。

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()

文件下载代码。使用这段代码，我可以下载.xls文件，但即使添加了所有数据，仍然没有加密。

    outputStream.close()

}

问题是您下载的文件未加密。

Answer 1

您正在尝试使用两个库来创建Excel工作簿：JXL和Apache POI。他们彼此不知道任何。所以JXL忽略了密码。

Excel工作簿密码保护

加密和密码保护之间存在差异。两者都使用密码，但密码保护 不加密文件。该文件仍可以读取，但不能修改。

这是一个显示如何对工作簿进行密码保护的示例。我正在使用我的库Frosted Sheets，这是Apache POI的便利包装。

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，工作簿未加密写入临时存储。默认值是字节数组（RAM），但也可以使用临时文件。

此外，请确保将响应标头中的文件扩展名更改为 xlsx 。

用grails加密xls文件并下载

1 个答案:

Excel工作簿密码保护

Excel工作簿加密