[英]I want to Create a password protected excel file using Apache POI, and then give to for download to Servlet.getOutputStream()
我無權將文件保存到文件系統。 我在網上可以找到的所有示例都在使用文件系統。
我想在內存中創建工作簿,如下所示:
HSSFWorkbook workbook = new HSSFWorkbook();
將數據寫入工作簿...保護工作簿密碼。
然后將工作簿寫入輸出流,如下所示:
workbook.write(servlet.getOutputStream());
我能夠獲得以下與HttpServlet和HSSFWorkbook .xls文件一起使用的內容-WorkbookServlet.java:
package com.joshden;
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.record.crypto.Biff8EncryptionKey;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Workbook;
@WebServlet("/workbook")
public class WorkbookServlet extends HttpServlet {
private static final long serialVersionUID = 4087954595439224462L;
private static final String password = "foobar1";
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
response.setContentType("application/vnd.ms-excel");
response.addHeader("Content-Disposition", "attachment; filename=password_protected.xls");
createAndWriteEncryptedWorkbook(response.getOutputStream());
}
private void createAndWriteEncryptedWorkbook(OutputStream requestOutputStream) throws IOException {
HSSFWorkbook workbook = new HSSFWorkbook();
populateWorkbook(workbook);
Biff8EncryptionKey.setCurrentUserPassword(password);
workbook.write(requestOutputStream);
workbook.close();
}
private void populateWorkbook(Workbook workbook) {
workbook.createSheet("TestSheet");
// TODO create other sheets, populate cell values
}
}
通過對/ workbook的請求,該servlet在內存中使用名為TestSheet的工作表創建HSSF工作簿。 密碼設置為“ foobar1”。 它提示瀏覽器將其下載為名稱為password_protected.xls的文件。
另請參閱Apache POI-加密支持 。 從Apache POI 3.16開始,僅對二進制格式(HSSF)進行了加密。 在撰寫本文時,還沒有發布3.16,並且在我的示例中使用了3.16-beta1。
encyprtion支持指南還包含有關創建加密(受密碼保護).xlsx(XSSF)文件的信息。 這是我創建的示例,該示例將提示文件名為password_protected.xlsx:
package com.joshden;
import java.io.IOException;
import java.io.OutputStream;
import java.security.GeneralSecurityException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.poifs.crypt.EncryptionInfo;
import org.apache.poi.poifs.crypt.EncryptionMode;
import org.apache.poi.poifs.crypt.Encryptor;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
@WebServlet("/workbook")
public class WorkbookServlet extends HttpServlet {
private static final long serialVersionUID = 4087954595439224462L;
private static final String password = "foobar1";
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.addHeader("Content-Disposition", "attachment; filename=password_protected.xlsx");
createAndWriteEncryptedWorkbook(response.getOutputStream());
}
private void createAndWriteEncryptedWorkbook(OutputStream requestOutputStream) throws IOException {
XSSFWorkbook workbook = new XSSFWorkbook();
OPCPackage opc = workbook.getPackage();
populateWorkbook(workbook);
try {
POIFSFileSystem fileSystem = new POIFSFileSystem();
opc.save(getEncryptingOutputStream(fileSystem, password));
fileSystem.writeFilesystem(requestOutputStream);
}
finally {
workbook.close();
}
}
private void populateWorkbook(Workbook workbook) {
workbook.createSheet("TestSheet");
// TODO create other sheets, populate cell values
}
private OutputStream getEncryptingOutputStream(POIFSFileSystem fileSystem, String password) throws IOException {
EncryptionInfo encryptionInfo = new EncryptionInfo(EncryptionMode.agile);
Encryptor encryptor = encryptionInfo.getEncryptor();
encryptor.confirmPassword(password);
try {
return encryptor.getDataStream(fileSystem);
}
catch (GeneralSecurityException e) {
// TODO handle this better
throw new RuntimeException(e);
}
}
}
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