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Java Tutorial/PDF/PDF Encrypt Decrypt - История изменений
2026-04-19T01:49:13Z
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Admin: 1 версия
2010-06-01T05:21:52Z
<p>1 версия</p>
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<td colspan="1" style="background-color: white; color:black; text-align: center;">Версия 05:21, 1 июня 2010</td>
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Admin
http://www.jexp.ru/index.php?title=Java_Tutorial/PDF/PDF_Encrypt_Decrypt&diff=5581&oldid=prev
в 17:44, 31 мая 2010
2010-05-31T17:44:27Z
<p></p>
<p><b>Новая страница</b></p><div>== Decrypt Pdf file ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
import java.io.FileOutputStream;<br />
import com.lowagie.text.pdf.PdfEncryptor;<br />
import com.lowagie.text.pdf.PdfReader;<br />
import com.lowagie.text.pdf.PdfStamper;<br />
import com.lowagie.text.pdf.PdfWriter;<br />
public class MainClass {<br />
public static void main(String[] args) throws Exception {<br />
PdfEncryptor<br />
.encrypt(new PdfReader("1.pdf"), new FileOutputStream("Encrypted2.pdf"),<br />
"Hello".getBytes(), "World".getBytes(), PdfWriter.AllowDegradedPrinting,<br />
PdfWriter.STRENGTH128BITS);<br />
// decrypt the file<br />
PdfReader reader = new PdfReader("Encrypted2.pdf", "World".getBytes());<br />
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("Decrypted1.pdf"));<br />
stamper.close();<br />
getEncryptionInformation("1.pdf", null);<br />
getEncryptionInformation("Encrypted2.pdf", "World");<br />
getEncryptionInformation("Decrypted1.pdf", "World");<br />
}<br />
public static void getEncryptionInformation(String filename, String ownerpassword)<br />
throws Exception {<br />
PdfReader reader;<br />
if (ownerpassword == null)<br />
reader = new PdfReader(filename);<br />
else<br />
reader = new PdfReader(filename, ownerpassword.getBytes());<br />
System.out.println("Encrypted? " + reader.isEncrypted());<br />
if (reader.isEncrypted()) {<br />
System.out.println("Permissions: "<br />
+ PdfEncryptor.getPermissionsVerbose(reader.getPermissions()));<br />
System.out.println("128 bit? " + reader.is128Key());<br />
}<br />
}<br />
}</source><br />
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<!-- end source code --><br />
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== Degraded printing ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
import java.io.FileOutputStream;<br />
import com.lowagie.text.pdf.PdfEncryptor;<br />
import com.lowagie.text.pdf.PdfReader;<br />
import com.lowagie.text.pdf.PdfStamper;<br />
import com.lowagie.text.pdf.PdfWriter;<br />
public class MainClass {<br />
public static void main(String[] args) throws Exception {<br />
PdfEncryptor<br />
.encrypt(new PdfReader("1.pdf"), new FileOutputStream("Encrypted2.pdf"),<br />
"Hello".getBytes(), "World".getBytes(), PdfWriter.AllowDegradedPrinting,<br />
PdfWriter.STRENGTH128BITS);<br />
getEncryptionInformation("1.pdf", null);<br />
getEncryptionInformation("Encrypted2.pdf", "World");<br />
}<br />
public static void getEncryptionInformation(String filename, String ownerpassword)<br />
throws Exception {<br />
PdfReader reader;<br />
if (ownerpassword == null)<br />
reader = new PdfReader(filename);<br />
else<br />
reader = new PdfReader(filename, ownerpassword.getBytes());<br />
System.out.println("Encrypted? " + reader.isEncrypted());<br />
if (reader.isEncrypted()) {<br />
System.out.println("Permissions: "<br />
+ PdfEncryptor.getPermissionsVerbose(reader.getPermissions()));<br />
System.out.println("128 bit? " + reader.is128Key());<br />
}<br />
}<br />
}</source><br />
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<!-- end source code --><br />
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== Encrypt the file with PdfStamper ==<br />
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<!-- start source code --><br />
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<source lang="java"><br />
import java.io.FileOutputStream;<br />
import com.lowagie.text.pdf.PdfEncryptor;<br />
import com.lowagie.text.pdf.PdfReader;<br />
import com.lowagie.text.pdf.PdfStamper;<br />
import com.lowagie.text.pdf.PdfWriter;<br />
public class MainClass {<br />
public static void main(String[] args) throws Exception {<br />
PdfReader reader = new PdfReader("1.pdf");<br />
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("Encrypted1.pdf"));<br />
stamper.setEncryption("Hello".getBytes(), "World".getBytes(), PdfWriter.AllowPrinting<br />
| PdfWriter.AllowCopy, PdfWriter.STRENGTH40BITS);<br />
stamper.close();<br />
getEncryptionInformation("1.pdf", null);<br />
getEncryptionInformation("Encrypted1.pdf", "World");<br />
}<br />
public static void getEncryptionInformation(String filename, String ownerpassword)<br />
throws Exception {<br />
PdfReader reader;<br />
if (ownerpassword == null)<br />
reader = new PdfReader(filename);<br />
else<br />
reader = new PdfReader(filename, ownerpassword.getBytes());<br />
System.out.println("Encrypted? " + reader.isEncrypted());<br />
if (reader.isEncrypted()) {<br />
System.out.println("Permissions: "<br />
+ PdfEncryptor.getPermissionsVerbose(reader.getPermissions()));<br />
System.out.println("128 bit? " + reader.is128Key());<br />
}<br />
}<br />
}</source><br />
<br />
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<!-- end source code --><br />
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== Get Encryption Information ==<br />
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<!-- start source code --><br />
<br />
<source lang="java"><br />
import java.io.FileOutputStream;<br />
import com.lowagie.text.pdf.PdfEncryptor;<br />
import com.lowagie.text.pdf.PdfReader;<br />
import com.lowagie.text.pdf.PdfStamper;<br />
import com.lowagie.text.pdf.PdfWriter;<br />
public class MainClass {<br />
public static void main(String[] args) throws Exception {<br />
PdfReader reader = new PdfReader("1.pdf");<br />
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("Encrypted1.pdf"));<br />
stamper.setEncryption("Hello".getBytes(), "World".getBytes(), PdfWriter.AllowPrinting<br />
| PdfWriter.AllowCopy, PdfWriter.STRENGTH40BITS);<br />
stamper.close();<br />
getEncryptionInformation("1.pdf", null);<br />
getEncryptionInformation("Encrypted1.pdf", "World");<br />
}<br />
public static void getEncryptionInformation(String filename, String ownerpassword)<br />
throws Exception {<br />
PdfReader reader;<br />
if (ownerpassword == null)<br />
reader = new PdfReader(filename);<br />
else<br />
reader = new PdfReader(filename, ownerpassword.getBytes());<br />
System.out.println("Encrypted? " + reader.isEncrypted());<br />
if (reader.isEncrypted()) {<br />
System.out.println("Permissions: "<br />
+ PdfEncryptor.getPermissionsVerbose(reader.getPermissions()));<br />
System.out.println("128 bit? " + reader.is128Key());<br />
}<br />
}<br />
}</source><br />
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<!-- end source code --></div>