将MD5数组转换为字符串java
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Convert MD5 array to String java
提问by Andrew
I know that there is a lot of similar topics, but still... can someone provide me a working example of method which generates MD5 String.
I'm currently using MessageDigest, and I'm doing the following to get a string
我知道有很多类似的主题，但仍然......有人可以为我提供一个生成 MD5 字符串的方法的工作示例。
我目前正在使用 MessageDigest，我正在执行以下操作以获取字符串
sun.misc.BASE64Encoder().encode(messageDigest.digest())
I guess there is some better way to do that.
Thanks in advance!
我想有一些更好的方法可以做到这一点。
提前致谢！
采纳答案by Jigar Joshi
MessageDigest md = MessageDigest.getInstance("MD5");
byte[] arr = md.digest(bytesOfMessage);
return Base64.getEncoder().encodeToString(arr);
note: md5 is not considered as good hash algorithm anymore, consider choosing SHAs
注意：md5 不再被认为是好的哈希算法，请考虑选择 SHA
回答by Bozho
I'd use commons-codec
我会使用公共编解码器
- Base64 -
Base64.encodeBase64(digestBytes) - Hex-string -
Hex.encodeHex(digestBytes)
- Base64 -
Base64.encodeBase64(digestBytes) - 六角字符串 -
Hex.encodeHex(digestBytes)
回答by Grodriguez
// Convert to hex string
StringBuffer sb = new StringBuffer();
for (int i = 0; i < messageDigest.length; i++) {
if ((0xff & messageDigest[i]) < 0x10) {
sb.append('0');
}
sb.append(Integer.toHexString(0xff & messageDigest[i]));
}
String md5 = sb.toString();
This assumes you actually want your MD5 printed as an hex string, not BASE64-encoded. That's the way it is normally represented.
这假设您实际上希望将 MD5 打印为十六进制字符串，而不是 BASE64 编码。这就是它通常的表示方式。
回答by Pau Kou
I've seen next solution:
我已经看到下一个解决方案：
byte[] digest = md.digest(someDataByteArray);
StringBuilder hex = new StringBuilder();
for (byte b : digest) {
hex.append(String.format("%02x", b));
}
回答by WesternGun
import javax.xml.bind.DatatypeConverter;
import java.security.MessageDigest;
...
String input = "westerngun";
MessageDigest digest = MessageDigest.getInstance("MD5"); // not thread-safe, create instance for each thread
byte[] result = digest.digest(input.getBytes()); // get MD5 hash array, could contain negative
String hex = DatatypeConverter.printHexBinary(result).toLowerCase(); // convert byte array to hex string
If you want a number:
如果你想要一个数字：
Integer number = Integer.parseInt(hex, 16); // parse hex number to integer. If overflowed, use Long.parseLong()
