java加密解密

package net.it;import java.io.ByteArrayOutputStream;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.OutputStream;import java.security.Key;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;public class Hello2 {/** * @param args */public static void main(String[] args) {jiami();jiemi();}private static void jiami() {try {//实例个 加密对象Cipher cipher=Cipher.getInstance("AES");// 实例密钥SecretKey secreKey = KeyGenerator.getInstance("AES").generateKey();//通过secreKey加密cipher.init(Cipher.ENCRYPT_MODE, secreKey);byte[] result = cipher.doFinal("itdoselt444".getBytes());//把key保存到硬盘FileOutputStream foskey = new FileOutputStream("txx_key");ObjectOutputStream oossecreKey = new ObjectOutputStream(foskey);oossecreKey.writeObject(secreKey);oossecreKey.close();foskey.close();//把result保存到硬盘FileOutputStream fosresult = new FileOutputStream("txx_data");fosresult.write(result);fosresult.close();System.out.println("end");} catch (Exception e) {e.printStackTrace();}}private static void jiemi(){try {//实例个 加密对象Cipher cipher=Cipher.getInstance("AES");FileInputStream fiskey = new FileInputStream("txx_key");ObjectInputStream oiskey = new ObjectInputStream(fiskey);Key key = (Key)oiskey.readObject();oiskey.close();fiskey.close();//通过secreKey解密cipher.init(Cipher.DECRYPT_MODE, key);FileInputStream fisresult = new FileInputStream("txx_data");ByteArrayOutputStream baos = new ByteArrayOutputStream();copyStream(fisresult,baos);byte[] result = cipher.doFinal(baos.toByteArray());baos.close();fisresult.close();System.out.println(new String(result));} catch (Exception e) {e.printStackTrace();}}private static void copyStream(InputStream fis,OutputStream fos){byte[] buf = new byte[1024];try {int len = fis.read(buf);while (len != -1) {fos.write(buf, 0, len);len = fis.read(buf);System.out.println(len);}} catch (IOException e) {e.printStackTrace();}}}