一个由老紫竹群中dgqbcht的提供，还有一个由不想要昵称提供，感谢
MD5加密一
package test;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5 {
public static void main(String[] args)
{
MD5 md5 = new MD5();
System.out.println(md5.md5("heisetoufa"));
// System.out.println(md5.md5("heisetoufa").length());
}
public String md5(String source) {
String dest = null;
try {
MessageDigest md5 = MessageDigest.getInstance("MD5");
char[] charArray = source.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));
}
dest = hexValue.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return dest;
}
}加密算法二，可自定义某种算法
package test;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD {
public static void main(String[] args) {
MD md = new MD();
System.out.println(md.encrypte("heisetoufa", "SHA-1"));// SHA-1算法
System.out.println(md.encrypte("heisetoufa", "SHA-256"));// SHA-256算法
System.out.println(md.encrypte("heisetoufa", "SHA-512"));// SHA-512算法
System.out.println(MD.encrypte("heisetoufa", "MD2"));//MD2算法
System.out.println(MD.encrypte("heisetoufa", "MD5"));//MD5算法
}
/**
* encrypted password based on JCA algorithm of message digest
*
* @param plainText
* orginal password text
* @param algorithm
* name of algorithm
* @return encrypted password
*/
private static String encrypte(String plainText, String algorithm) {
MessageDigest md = null;
try {
md = MessageDigest.getInstance(algorithm);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
md.update(plainText.getBytes());
byte[] b = md.digest();
StringBuilder output = new StringBuilder(32);
for (int i = 0; i < b.length; i++) {
String temp = Integer.toHexString(b[i] & 0xff);
if (temp.length() < 2) {
output.append("0");
}
output.append(temp);
}
return output.toString();
}
}
