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import java.io.FileInputStream;  
import java.io.FileOutputStream;  
import java.security.Key;  
import java.security.KeyStore;  
import java.security.cert.Certificate;  
import java.util.Enumeration;  
 
public class ConventPFX {  
    public static final String PKCS12 = "PKCS12";  
    public static final String JKS = "JKS";  
    public static final String PFX_KEYSTORE_FILE = "G:\\test.pfx";  
    public static final String KEYSTORE_PASSWORD = "123456";  
    public static final String JKS_KEYSTORE_FILE = "G:\\test.jks";  
 
    public static void coverTokeyStore() {  
        try {  
            KeyStore inputKeyStore = KeyStore.getInstance("PKCS12");  
            FileInputStream fis = new FileInputStream(PFX_KEYSTORE_FILE);  
            char[] nPassword = null;  
 
            if ((KEYSTORE_PASSWORD == null)  
                    || KEYSTORE_PASSWORD.trim().equals("")) {  
                nPassword = null;  
            } else {  
                nPassword = KEYSTORE_PASSWORD.toCharArray();  
            }  
 
            inputKeyStore.load(fis, nPassword);  
            fis.close();  
 
            KeyStore outputKeyStore = KeyStore.getInstance("JKS");  
 
            outputKeyStore.load(null, KEYSTORE_PASSWORD.toCharArray());  
 
            Enumeration enums = inputKeyStore.aliases();  
 
            while (enums.hasMoreElements()) { //   we   are   readin   just   one   certificate.    
 
                String keyAlias = (String) enums.nextElement();  
 
                System.out.println("alias=[" + keyAlias + "]");  
 
                if (inputKeyStore.isKeyEntry(keyAlias)) {  
                    Key key = inputKeyStore.getKey(keyAlias, nPassword);  
                    Certificate[] certChain = inputKeyStore  
                            .getCertificateChain(keyAlias);  
 
                    outputKeyStore.setKeyEntry(keyAlias, key, KEYSTORE_PASSWORD  
                            .toCharArray(), certChain);  
                }  
            }  
 
            FileOutputStream out = new FileOutputStream(JKS_KEYSTORE_FILE);  
 
            outputKeyStore.store(out, nPassword);  
            out.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
    public static void coverToPfx() {  
        try {  
            KeyStore inputKeyStore = KeyStore.getInstance("JKS");  
            FileInputStream fis = new FileInputStream(JKS_KEYSTORE_FILE);  
            char[] nPassword = null;  
 
            if ((KEYSTORE_PASSWORD == null)  
                    || KEYSTORE_PASSWORD.trim().equals("")) {  
                nPassword = null;  
            } else {  
                nPassword = KEYSTORE_PASSWORD.toCharArray();  
            }  
 
            inputKeyStore.load(fis, nPassword);  
            fis.close();  
 
            KeyStore outputKeyStore = KeyStore.getInstance("PKCS12");  
 
            outputKeyStore.load(null, KEYSTORE_PASSWORD.toCharArray());  
 
            Enumeration enums = inputKeyStore.aliases();  
 
            while (enums.hasMoreElements()) { //   we   are   readin   just   one   certificate.    
 
                String keyAlias = (String) enums.nextElement();  
 
                System.out.println("alias=[" + keyAlias + "]");  
 
                if (inputKeyStore.isKeyEntry(keyAlias)) {  
                    Key key = inputKeyStore.getKey(keyAlias, nPassword);  
                    Certificate[] certChain = inputKeyStore  
                            .getCertificateChain(keyAlias);  
 
                    outputKeyStore.setKeyEntry(keyAlias, key, KEYSTORE_PASSWORD  
                            .toCharArray(), certChain);  
                }  
            }  
 
            FileOutputStream out = new FileOutputStream(PFX_KEYSTORE_FILE);  
 
            outputKeyStore.store(out, nPassword);  
            out.close();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
    public static void main(String[] args) {  
        coverToPfx();  
    }  
}  

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