java使用itext為pdf文件設置密碼保護

我們可以使用itext的PdfWriter類的setEncryption方法來為pdf文件設置密碼

package com.open.pdf;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.Date;
import com.itextpdf.text.Document;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.PdfWriter;
public class GeneratePDF {

private static String USER_PASS = "Hello123";

private static String OWNER_PASS = "Owner123";

public static void main(String[] args) {
    try {

        OutputStream file = new FileOutputStream(new File("D:\\Test.pdf"));

        Document document = new Document();
        PdfWriter writer = PdfWriter.getInstance(document, file);

        writer.setEncryption(USER_PASS.getBytes(), OWNER_PASS.getBytes(),
                PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128);

        document.open();
        document.add(new Paragraph("Hello World, iText"));
        document.add(new Paragraph(new Date().toString()));

        document.close();
        file.close();

    } catch (Exception e) {

        e.printStackTrace();
    }
}

}</pre>