用 JavaScript 通过 C++ 加密 Excel 文件
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Microsoft Excel (97 - 365) 可以让您对电子表格进行加密和密码保护。它使用加密服务提供商（CSP）提供的算法，即一组具有不同属性的加密算法。默认的CSP是’Office 97/2000兼容’或’弱加密（XOR）'。选择适当的加密密钥长度很重要。有些CSP不支持超过40或56位。这被视为弱加密。对于强加密，需要最小128位的密钥长度。而且，Microsoft Windows中还包含提供强加密类型的CSP，例如 ‘Microsoft Strong Cryptographic Provider’。举例来说，128位加密是银行用于与其网上银行系统进行加密连接的加密级别。
Aspose.Cells允许您使用所需的加密类型对Microsoft Excel文件进行加密和密码保护。
使用Microsoft Excel
在Microsoft Excel（例如Microsoft Excel 2003）中设置文件加密设置:
- 从工具菜单中选择选项。会出现一个对话框。
- 选择安全选项卡。
- 输入密码并点击高级。
- 选择加密类型并确认密码。
用 Aspose.Cells for JavaScript 通过 C++ 进行加密
下面的示例显示了如何使用Aspose.Cells API对Excel文件进行加密和密码保护。
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Encrypt Workbook Example</h1>
<input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
<button id="runExample">Run Example</button>
<a id="downloadLink" style="display: none;">Download Result</a>
<div id="result"></div>
</body>
<script src="aspose.cells.js.min.js"></script>
<script type="text/javascript">
const { Workbook, SaveFormat, Utils, EncryptionType } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
document.getElementById('runExample').addEventListener('click', async () => {
const fileInput = document.getElementById('fileInput');
if (!fileInput.files.length) {
document.getElementById('result').innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
return;
}
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
// Instantiate a Workbook object by opening the uploaded Excel file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Specify XOR encryption type.
workbook.encryptionOptions = { type: EncryptionType.XOR, keyLength: 40 };
// Specify Strong Encryption type (RC4, Microsoft Strong Cryptographic Provider).
workbook.encryptionOptions = { type: EncryptionType.StrongCryptographicProvider, keyLength: 128 };
// Password protect the file.
workbook.settings.password = "1234";
// Save the excel file (Excel97To2003 format for .xls)
const outputData = workbook.save(SaveFormat.Excel97To2003);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'encryptedBook1.out.xls';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Encrypted Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">File encrypted successfully! Click the download link to get the modified file.</p>';
});
</script>
</html>
指定修改密码选项
下面的示例显示了如何使用Aspose.Cells API为现有文件设置修改密码 Microsoft Excel选项。
<!DOCTYPE html>
<html>
<head>
<title>Specify Password To Modify Option Example</title>
</head>
<body>
<h1>Specify Password To Modify Option Example</h1>
<input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
<button id="runExample">Run Example</button>
<a id="downloadLink" style="display: none;">Download Result</a>
<div id="result"></div>
</body>
<script src="aspose.cells.js.min.js"></script>
<script type="text/javascript">
const { Workbook, SaveFormat } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
document.getElementById('runExample').addEventListener('click', async () => {
const fileInput = document.getElementById('fileInput');
if (!fileInput.files.length) {
document.getElementById('result').innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
return;
}
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
// Instantiate a Workbook object by opening the uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Set the password for modification.
workbook.settings.writeProtection.password = "1234";
// Save the excel file in Excel97-2003 format (.xls)
const outputData = workbook.save(SaveFormat.Excel97To2003);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'SpecifyPasswordToModifyOption.out.xls';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Modified Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Password to modify set successfully! Click the download link to get the modified file.</p>';
});
</script>
</html>
验证加密文件的密码
验证加密文件的密码，Aspose.Cells for JavaScript 通过 C++ 提供 FileFormatUtil.verifyPassword(Uint8Array, string) 方法。这些方法接受两个参数：文件流和需要验证的密码。 以下代码片段演示了使用FileFormatUtil.verifyPassword(Uint8Array, string)方法来验证提供的密码是否有效。
<!DOCTYPE html>
<html>
<head>
<title>Verify Password Example</title>
</head>
<body>
<h1>Verify Password Example</h1>
<input type="file" id="fileInput" accept=".xls,.xlsx,.csv,.xlsm" />
<button id="runExample">Verify Password</button>
<a id="downloadLink" style="display: none;">Download Result</a>
<div id="result"></div>
</body>
<script src="aspose.cells.js.min.js"></script>
<script type="text/javascript">
const { Workbook, SaveFormat, Worksheet, Cell, Utils } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
document.getElementById('runExample').addEventListener('click', async () => {
const fileInput = document.getElementById('fileInput');
if (!fileInput.files.length) {
document.getElementById('result').innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
return;
}
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
const uint8 = new Uint8Array(arrayBuffer);
const isPasswordValid = AsposeCells.FileFormatUtil.verifyPassword(uint8, "1234");
document.getElementById('result').innerHTML = '<p>Password is Valid: ' + isPasswordValid + '</p>';
});
</script>
</html>
Aspose.Cells对ODS文件的加密/解密
Aspose.Cells允许你加密和解密ODS文件。解密后的ODS文件可以在Excel和OpenOffice中打开，然而加密的ODS文件只能在提供密码后由OpenOffice打开。Excel无法打开加密的ODS文件，可能会发出警告信息。不同于其他文件类型，ODS文件的加密选项不适用。要加密ODS文件，加载文件并在保存前将WorkbookSettings.password值设置为实际密码。输出的加密ODS文件只能在OpenOffice中打开。
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Encrypt ODS File Example</h1>
<input type="file" id="fileInput" accept=".ods" />
<button id="runExample">Run Example</button>
<a id="downloadLink" style="display: none;">Download Result</a>
<div id="result"></div>
</body>
<script src="aspose.cells.js.min.js"></script>
<script type="text/javascript">
const { Workbook, SaveFormat } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
document.getElementById('runExample').addEventListener('click', async () => {
const fileInput = document.getElementById('fileInput');
if (!fileInput.files.length) {
document.getElementById('result').innerHTML = '<p style="color: red;">Please select an ODS file.</p>';
return;
}
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
// Instantiate Workbook from uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Password protect the file
workbook.settings.password = "1234";
// Save the ODS file
const outputData = workbook.save(SaveFormat.Ods);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'outputEncryptedODSFile.ods';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Encrypted ODS File';
document.getElementById('result').innerHTML = '<p style="color: green;">File encrypted successfully! Click the download link to get the encrypted file.</p>';
});
</script>
</html>
要解密ODS文件，通过在LoadOptions.password中提供密码来加载文件。一旦文件加载完成，将WorkbookSettings.password字符串设置为null。
<!DOCTYPE html>
<html>
<head>
<title>Decrypt ODS Example</title>
</head>
<body>
<h1>Decrypt ODS Example</h1>
<input type="file" id="fileInput" accept=".ods" />
<button id="runExample">Run Example</button>
<a id="downloadLink" style="display: none;">Download Result</a>
<div id="result"></div>
</body>
<script src="aspose.cells.js.min.js"></script>
<script type="text/javascript">
const { Workbook, SaveFormat, LoadOptions, LoadFormat, Utils } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
document.getElementById('runExample').addEventListener('click', async () => {
const fileInput = document.getElementById('fileInput');
if (!fileInput.files.length) {
document.getElementById('result').innerHTML = '<p style="color: red;">Please select an ODS file.</p>';
return;
}
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
// Create load options for ODS and set original password
const loadOptions = new LoadOptions(LoadFormat.Ods);
loadOptions.password = "1234";
// Load the encrypted ODS file with the appropriate load options
const workbook = new Workbook(new Uint8Array(arrayBuffer), loadOptions);
// Set the password to null to remove encryption/password
workbook.settings.password = null;
// Save the decrypted ODS file
const outputData = workbook.save(SaveFormat.Ods);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'outputDecryptedODSFile.ods';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Decrypted ODS File';
document.getElementById('result').innerHTML = '<p style="color: green;">File decrypted successfully! Click the download link to get the decrypted file.</p>';
});
</script>
</html>