java加解密操作过程中的中文乱码问题

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

import org.apache.commons.codec.BinaryDecoder;
import org.apache.commons.codec.binary.Hex;

public class DESDemo {
    public static final String src = "des test";
    public static void main(String[] args)
    {
        jdkDES();
        bcDES();

    }

    private static void bcDES() {

    }

    private static void jdkDES() {
        try{
            //生成KEY
            KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
            keyGenerator.init(56);
            System.out.println(keyGenerator.getAlgorithm());
            System.out.println(keyGenerator.getProvider());

            SecretKey secretKey = keyGenerator.generateKey();
            byte[] bytesKey = secretKey.getEncoded();
            System.out.println(secretKey.getAlgorithm());
            System.out.println(secretKey.getFormat());

            //通过KEY转换生成密钥
            DESKeySpec desKeySpec = new DESKeySpec(bytesKey);
            SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
            SecretKey convertedKey = factory.generateSecret(desKeySpec);

            //加密
            Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");// 算法/工作方式/填充方式
            cipher.init(Cipher.ENCRYPT_MODE, convertedKey);
            byte[] result = cipher.doFinal("要加密的内容".getBytes());
            System.out.println("jdk des encrypt:" + Hex.encodeHexString(result));

            //解密
            cipher.init(Cipher.DECRYPT_MODE,convertedKey);
            result = cipher.doFinal(result);
//            System.out.println("jdk des decrypt:" + new String(result));  //jdk des decrypt:?????????? 直接输出会乱码
            System.out.println("jdk des decrypt:" + new String( result,"utf-8" ));  //jdk des decrypt:??????????  依旧乱码

        }
        catch(Exception e) {
            e.printStackTrace();
        }
    }
}

请问windows系统默认编码是gbk吗？

• 2015年10月15日提问
• 1 评论
• 邀请回答

默认排序时间排序

4 个回答

答案对人有帮助，有参考价值0答案没帮助，是错误的答案，答非所问

还是楼主的代码, 没发现什么乱码:

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

public class DESDemo {
    public static void main(String[] args)
    {
        try{
            //生成KEY
            KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
            keyGenerator.init(56);
            System.out.println(keyGenerator.getAlgorithm());
            System.out.println(keyGenerator.getProvider());

            SecretKey secretKey = keyGenerator.generateKey();
            byte[] bytesKey = secretKey.getEncoded();
            System.out.println(secretKey.getAlgorithm());
            System.out.println(secretKey.getFormat());

            //通过KEY转换生成密钥
            DESKeySpec desKeySpec = new DESKeySpec(bytesKey);
            SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
            SecretKey convertedKey = factory.generateSecret(desKeySpec);

            //加密
            Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");// 算法/工作方式/填充方式
            cipher.init(Cipher.ENCRYPT_MODE, convertedKey);
            byte[] result = cipher.doFinal("要加密的内容".getBytes());

            //解密
            cipher.init(Cipher.DECRYPT_MODE,convertedKey);
            result = cipher.doFinal(result);
            System.out.println("jdk des decrypt:" + new String(result));
        }
        catch(Exception e) {
            e.printStackTrace();
        }
    }
}

文件保存的编码为: gb2312 的时候运行结果:

文件保存的编码为: utf-8 的时候运行结果:

因为Windows的控制台不能显示 utf-8 编码的内容, 所以我用 > 把结果输出到 11.txt 的文件中,
上面的截图中包含 11.txt 的内容, 可以看到汉字还是正确的.
11.txt 文件的编码为 utf-8.

在文件以UTF-8编码保存时, 使用下面的方式可以正确显示:

同理当文件是以gb2312编码保存的时候, 可以省略这个参数,或者指定为 gb2312 就可以正常显示了:

总结一下就是 你源文件保存的编码,与你使用 new String 时传递的第二个参数 不一致导致的.