1 Java程序列出密钥库所有条目

import java.util.*;
import java.io.*;
import java.security.*;
public class ShowAlias{
    public static void main(String args[ ]) throws Exception{
        String pass="080302";
        String name=".keystore";
        FileInputStream in=new FileInputStream(name);
        KeyStore ks=KeyStore.getInstance("JKS");
        ks.load(in,pass.toCharArray());
        Enumeratione=ks.aliases( );
        while( e.hasMoreElements()) {
            System.out.println(e.nextElement());
        }
    }
}  

2 Java程序修改密钥库口令

import java.io.*;
import java.security.*;
public class SetStorePass{
    public static void main(String args[ ]) throws Exception{
        char[ ] oldpass="080302".toCharArray();
        char[ ] newpass="123456".toCharArray();
        String name=".keystore";
        FileInputStream in=new FileInputStream(name);
        KeyStore ks=KeyStore.getInstance("JKS");
        ks.load(in,oldpass);
        in.close();
        FileOutputStream output=new FileOutputStream(name);
        ks.store(output,newpass);
        output.close();
    }
}  

3 Java程序修改密钥库条目的口令及添加条目

package test;

import java.io.*;

import java.security.*;

import java.security.cert.Certificate;

public class SetKeyPass{

   public static void main(String args[ ]) throws Exception{

        //读取相关参数

        String name=".keystore";

        String alias="mykey";

        char[ ] storepass="123456".toCharArray();

        char[ ] oldkeypass="080302".toCharArray();

        char[ ] newkeypass="123456".toCharArray();

        //获取密钥库.keystore的KeyStore对象，并加载密钥库

        FileInputStream in=new FileInputStream(name);

        KeyStore ks=KeyStore.getInstance("JKS");

        ks.load(in,storepass);

        //获取别名对应的条目的证书链

        Certificate[ ] cchain=ks.getCertificateChain(alias);

        //读取别名对应的条目的私钥

        PrivateKey pk=(PrivateKey)ks.getKey(alias,oldkeypass);

        //向密钥库中添加新的条目

        ks.setKeyEntry(alias,pk,newkeypass,cchain);

        in.close();

        //将KeyStore对象内容写入新文件

        FileOutputStream output=new FileOutputStream("333");

        ks.store(output,storepass);

        output.close(); 

    }

}

4 Java程序检验别名及删除条目

package test;

import java.io.*;

import java.security.*;

public class DeleteAlias{

    public static void main(String args[ ]) throws Exception{

        String pass = "123456";

        String name = ".keystore";

        String alias = "mykey";

        FileInputStream in=new FileInputStream(name);

        KeyStore ks=KeyStore.getInstance("JKS");           

        ks.load(in,pass.toCharArray());

        if (ks.containsAlias(alias)){

            ks.deleteEntry(alias);

            FileOutputStream output=new FileOutputStream(name);

            ks.store(output,pass.toCharArray());

            System.out.println("Alias "+alias+" deleted");

        }else{

            System.out.println("Alias not exist");

        }

    }

}  

5 Java程序从密钥库直接读取证书

import java.io.*;

import java.security.*;

import java.security.cert.Certificate;

public class PrintCert2{

    public static void main(String args[ ]) throws Exception{

          String pass="080302";

          String alias="mykey";

          String name=".keystore";

          FileInputStream in=new FileInputStream(name);

          KeyStore ks=KeyStore.getInstance("JKS");           

          ks.load(in,pass.toCharArray());

          Certificate c=ks.getCertificate(alias);

          in.close();

         System.out.println(c.toString( ));

    }

}