Apache Commons codec Introduction and getting Started code

Java JDK has a java.security package that provides messagedigest encoding, Digest algorithms includes MD2, MD5, SHA-1, SHA-256, SHA-384, and S HA-512 and so on;

Codec is a tool class package used in the Commons project to handle commonly used coding methods, such as Hex, SHA1, MD5, Base64, and so on, the latest version is now 1.4.

Base64/hex is symmetric encryption, MD5 is irreversible encryption, we must pay attention to

Some simple cryptographic sample code:

Package Test.ffm83.commons.codec;

import java.io.UnsupportedEncodingException;

import org.apache.commons.codec.DecoderException;

import org.apache.commons.codec.binary.Base64;

import Org.apache.commons.codec.binary.Hex;

import org.apache.commons.codec.digest.DigestUtils;

/**

 * through Commonscodec do some simple encryption and decryption, etc.

 * @author Fan Fangming

*/

Public class Codecusage {

Public static void main (string[] args) {

Stringstr = "fanfangming";

Stringbase64 = encodebasetest(str);

decodebasetest (base64);

Stringhex = encodehextest(str);

decodehextest (hex);

md5test (str);

shatest (str);

}

//Base64 encode and Decode

private static Stringencodebasetest (String str) {

Base64base64 = newBase64 ();

Try {

Str= base64.encodetostring (Str.getbytes ("UTF-8"));

}catch(Unsupportedencodingexception e) {

E.printstacktrace ();

}

System. out. println ("Base64 after encoding:" + str);

return str;

}

private static void decodebasetest (stringstr) {

str= NewString (Base64. DecodeBase64(str));

System. out. println ("Base64 after decoding:" + str);

}

//Hex encode and Decode

private static Stringencodehextest (String str) {

Try {

Str= Hex. encodehexstring (Str.getbytes ("UTF-8"));

}catch(Unsupportedencodingexception e) {

E.printstacktrace ();

}

System. out. println ("Hex code after:" + str);

return str;

}

private static Stringdecodehextest (String str) {

Hexhex = newHex ();

Try {

str= NewString ((byte[]) Hex.decode (str));

}catch(Decoderexception e) {

E.printstacktrace ();

}

System. out. println ("Hex code after:" + str);

return str;

}

//MD5 Encrypt

private static String Md5test (STRINGSTR) {

Try {

str= NewString (digestutils. Md5hex(Str.getbytes ("UTF-8"));

System. out. println ("MD5 after encoding:" + str);

}catch(Unsupportedencodingexception e) {

E.printstacktrace ();

}

return str;

}

//SHA Coding

private static String Shatest (STRINGSTR) {

Try {

str= NewString (digestutils. sha256(Str.getbytes ("UTF-8"));

System. out. println ("SHA encoded:"+ str);

}catch(Unsupportedencodingexception e) {

E.printstacktrace ();

}

return str;

}

}

The results of the operation are as follows:

Base64 after encoding: rmfurmfuz21pbmc=

Base64 after decoding: fanfangming

Hex coded after: 46616e46616e676d696e67

Hex coded after: fanfangming

MD5 after encoding: 922b65d5455be7d9a4875b6b1bde638d

SHA encoded: 31FCBFD641E54747D20288F883458664A05788A9

Apache Commons codec Introduction and getting Started code