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saving a file by applet?

Posted on 2001-06-28
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Last Modified: 2013-11-23
Hi,
i m making an applet, which download a file nd then save it on disk...
Now is there any way of saving file through applet.
plz send practical answers.
wbw
kaspak
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Question by:kaspak
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Expert Comment

by:mohan_sekar
ID: 6237339
Hi,

     U have to use signed applet to do so.

bye
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Accepted Solution

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Ravindra76 earned 35 total points
ID: 6237963

Signing applets :-

http://www.ddj.com/articles/1999/9902/9902h/9902h.htm
http://java.sun.com/security/signExample/index.html
http://java.sun.com/docs/books/tutorial/applet/overview/security.html

Code signing resources:

Creating Signed, Persistent Java Applets
http://www.ddj.com/articles/1999/9902/9902h/9902h.htm

http://www.javasoft.com/products/jdk/1.1/docs/guide/security/index.html
http://java.sun.com/security/signExample/index.html
http://www.verisign.com/library/guide/developer/signing/index.html
http://www.suitable.com/Doc_CodeSigning.shtml
http://www.securingjava.com/appdx-c/
http://tactika.com/realhome/javaht/java-s1.html
http://www.fastlane.net/~tlandry/javafaq.txt

IE:
http://www.thawte.com/support/developer/ms.html
http://www.developer.com/journal/techworkshop/curr.html
http://www.verisign.com/library/guide/developer/authenticode/index.html
http://msdn.microsoft.com/library/psdk/crypto/cryptotools_6cdv.htm
http://msdn.microsoft.com/library/psdk/crypto/portaltool_3u3p.htm

NN:
http://developer.netscape.com/docs/manuals/signedobj/
http://developer.netscape.com/docs/manuals/signedobj/javadoc/Package-netscape_security.html
http://developer.netscape.com/docs/manuals/signedobj/targets/contents.htm
http://developer.netscape.com/support/faqs/objfaq.html
http://developer.netscape.com/docs/manuals/deploymt/4_5PREFS.HTM

NN: Bypass the need for a certificate
Netscape provides a way to accept a codebase as trusted (then a certificate is not needed). This can be useful during development or in a private Intranet. In the Netscape Users directory, there is a file called prefs.js. Adding the line user_pref("signed.applets.codebase_principal_support", true);

will enable JAR file without a certificate to request privileges on your machine. If you agree, it will be possible for an Applet to lauch a program, write a file on your hard disk or print on the printer. You will still have to ask for privileges in your program using the Netscape capabilites classes.
Another way is to lower general security setting to more allow more freedom when running applets locally. Add or modify the following entries in the prefs.js: user_pref("unsigned.applets.low_security_for_local_classes", true);
user_pref("signed.applets.local_classes_have_30_powers", true);
user_pref("signed.applets.low_security_for_local_classes", true);
user_pref("signed.applets.verbose_security_exception", true);


Then you don't need to asked for privileges for local classes.
When adding or modifying the file prefs.js, Netscape must not be running because your modification will be overwritten. So shut down Netscape, edit the prefs.js and then restart Netscape.


Running signed applets with the JavaTM Plug-in
http://www.suitable.com/CodeSigningSignPlug.shtml
http://java.sun.com/security/signExample/index.html

http://www.javasoft.com/products/jdk/1.1/docs/guide/security/index.html

DEPLOYING RSA SIGNED APPLETS IN JAVA TM PLUG-IN 1.2.2
http://java.sun.com/products/plugin/1.2/docs/nsobjsigning.html
http://java.sun.com/docs/books/tutorial/security1.2/toolsign/index.html


import netscape.security.*;

PrivilegeManager.grantPrivileges("UniversalConnect");
PrivilegeManager.grantPrivileges("UniversaLinkAccess");
try
 {
 // load Oracle-JDBC-driver
 Class.forName ("oracle.jdbc.driver.OracleDriver");
 }
 catch (Exception e)
 {
g.drawString("No able to load JDBC driver",300,300);
return;
 }
Courtesy: vladi21
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Expert Comment

by:yongsing
ID: 6240286
I have asked this question before. ravindra76, you provided so many links. Some of the articles seem quite old (more than two years). I don't even know which one I should really follow. Is there a 'standard' or popular method of signing applets?
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by:Ravindra76
ID: 6243697
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Expert Comment

by:Ravindra76
ID: 6243719
First three are best
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Author Comment

by:kaspak
ID: 6255560
hi,
ravindra76,
I have got the solution, now files r saving at my desired location.
I used ServletContext.getRealPath() to obtain absolute path on server of my application,
which i then use in MultipartRequest class
ne way thanks for good correspondence
kaspak
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