Java call Keytool generate KeyStore and CER certificates

Keytool is a management tool for Java data certificates.

Keytool the key (key) and certificate (certificates) exist in a file called KeyStore in KeyStore,

Contains two types of data:
Key Entity--key (secret key) or private key and paired public key (with asymmetric encryption)
Trusted certificate Entity (trusted certificate entries)--only public key is included

Ailas (alias) Each keystore is associated with this unique alias, which is usually case-insensitive

The following is an example test of Java calling Keytool generating KeyStore and CER certificates :

 Public classExportcertformkeystore { Public voidexeccommand (string[] arstringcommand) { for(inti = 0; i < arstringcommand.length; i++) {System.out.print (Arstringcommand[i]+ " "); }        Try{runtime.getruntime (). exec (Arstringcommand); } Catch(Exception e) {System.out.println (E.getmessage ()); }    }     Public voidexeccommand (String arstringcommand) {Try{runtime.getruntime (). exec (Arstringcommand); } Catch(Exception e) {System.out.println (E.getmessage ()); }    }    /*** Generate key*/     Public voidGenkey () {string[] Arstringcommand=Newstring[] {"cmd", "/k",                "Start",//cmd shell command"Keytool",                "-genkey",//-genkey indicates that the key is generated"-validity",//-validity Specify the certificate validity period (in days), this is 36,000 days"36500",                "-keysize",//Specify the key length"1024",                "-alias",//-alias Specifies the alias, here is the SS"SS",                "-keyalg",//-keyalg The algorithm that specifies the key, such as RSA DSA (if you do not specify DSA by default )"RSA",                "-keystore",//-keystore Specify the storage location, this is D:/demo.keystore"D:/demo.keystore",                "-dname",//cn= (First and last name), ou= (organizational unit name), o= (organization name), L= (city or region name) ,//st= (state or province name), c= (two-letter country code for the unit) ""Cn= (ss), ou= (ss), o= (ss), l= (BJ), st= (BJ), c= (CN)",                "-storepass",//Specify the password for the KeyStore (the password required to obtain the KeyStore information)"123456",                 "-keypass",//Specify the password for the alias entry (the password for the private key)"123456",                 "-V"//-V Show certificate details in keystore        };    ExecCommand (Arstringcommand); }    /*** Export certificate file*/     Public voidExport () {string[] Arstringcommand=Newstring[] {"cmd", "/k",                "Start",//cmd shell command"Keytool",                "-export",//-Export is specified as exporting Operation"-keystore",//-keystore Specify KeyStore file, here is D:/demo.keystore"D:/demo.keystore",                "-alias",//-alias Specifies the alias, here is the SS"SS",                "-file",//-file pointing to the export path"D:/demo.cer",                "-storepass",//Specify the password for the KeyStore"123456"                        };        ExecCommand (Arstringcommand); }}

JUnit Test Cases:

 import   Org.junit.Test;  public  class   exportcertformkeystoretest {@Test  public
     void   Genkeytest () { //  generate key test  new   Exportcertformkeystore (). Genkey (); } @Test  public  void   Exporttest () { //  export certificate file Test  new      Exportcertformkeystore (). Export (); }}

After running the test case, two files are generated below the root of the D drive:

Demo.keystore

Demo.cer

Java call Keytool generate KeyStore and CER certificates