How to digitally sign a jar package

To enable applets or Java Web start programs to access client local resources, you need to digitally sign the applet or JWS program jar package, and then when the client opens the applet or JWS program, it prompts you to allow the program to access local resources. If users want to use your program, of course, can only choose OK. This allows your program to access the client's local resources according to certain access rights.

Signature steps:
1. Make the program into a jar package.
This I will not say more, with Eclipse,netbeans and other development tools are very convenient to pack.

2. Generate the. store file with the Keytool command.
Create a Keytool.bat file under any folder, enter

Keytool-genkey-keystore Xxx.keystore-alias xxx-validity 3650

Save, double-click execution. A xxx.keystore file will be generated in the current directory,-alias followed by an alias, and-validity followed by a valid number of days for the certificate, where 3650 indicates 10. (The program signed with this certificate is valid for 10 years).

3. Sign the jar package with the Jarsigner program.
New Jarsinger.bat file, enter

Jarsigner-keystore xxx.keystore Helloworld.jar xxx

So the Helloworld.jar was signed.