Java实现md5和base64加密解密的示例代码
import java.io.IOException;
import java.security.MessageDigest;
import sun.misc.BASE64Encoder;
import sun.misc.BASE64Decoder;
public class MD5Util {
/**
* MD5加密
*/
public static String md5Encryption(String str) {
MessageDigest md5 = null;
try {
md5 = MessageDigest.getInstance("MD5");
} catch (Exception e) {
System.out.println(e.toString());
e.printStackTrace();
return "";
}
char[] charArray = str.toCharArray();
byte[] byteArray = new byte[charArray.length];
for (int i = 0; i < charArray.length; i++)
byteArray[i] = (byte) charArray[i];
byte[] md5Bytes = md5.digest(byteArray);
StringBuffer hexValue = new StringBuffer();
for (int i = 0; i < md5Bytes.length; i++) {
int val = ((int) md5Bytes[i]) & 0xff;
if (val < 16)
hexValue.append("0");
hexValue.append(Integer.toHexString(val));
}
return hexValue.toString();
}
/**
* base64加密
*/
public static String base64Encryption(String str) {
if (str == null) return null;
String encodeStr = "";
try {
BASE64Encoder b64Encoder = new BASE64Encoder();
encodeStr = b64Encoder.encode(str.getBytes());
} catch (Exception e) {
e.printStackTrace();
}
return encodeStr;
}
/**
* base64解密
*/
public static String base64Dcrypt(String str) {
if (str == null) return null;
String decoderStr = "";
try {
BASE64Decoder decoder = new BASE64Decoder();
byte[] b = decoder.decodeBuffer(str);
decoderStr = new String(b);
} catch (IOException e) {
e.printStackTrace();
return null;
}
return decoderStr;
}
}
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