MD5算法[ java 实现]

 Java代码

1. import java.io.UnsupportedEncodingException;
2. import java.security.MessageDigest;
3. import java.security.NoSuchAlgorithmException;
4.  
5. public class MD5 {
6.  
7. /**
8. * @param args
9. */
10. public static void main(String[] args) {
11. String str = "abc123";
12. System.out.println(MD5.getMD5Str(str));
13. }
14.  
15. private static String getMD5Str(String str) {
16. MessageDigest messageDigest = null;
17.  
18. try {
19. messageDigest = MessageDigest.getInstance("MD5");
20.  
21. messageDigest.reset();
22.  
23. messageDigest.update(str.getBytes("UTF-8"));
24. } catch (NoSuchAlgorithmException e) {
25. System.out.println("NoSuchAlgorithmException caught!");
26. System.exit(-1);
27. } catch (UnsupportedEncodingException e) {
28. e.printStackTrace();
29. }
30.  
31. byte[] byteArray = messageDigest.digest();
32.  
33. StringBuffer md5StrBuff = new StringBuffer();
34.  
35. for (int i = 0; i < byteArray.length; i++) {
36. if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
37. md5StrBuff.append("0").append(
38. Integer.toHexString(0xFF & byteArray[i]));
39. else
40. md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
41. }
42.  
43. return md5StrBuff.toString();
44. }
45. }  

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		String str = "abc123";
		System.out.println(MD5.getMD5Str(str));
	}

	private static String getMD5Str(String str) {
		MessageDigest messageDigest = null;

		try {
			messageDigest = MessageDigest.getInstance("MD5");

			messageDigest.reset();

			messageDigest.update(str.getBytes("UTF-8"));
		} catch (NoSuchAlgorithmException e) {
			System.out.println("NoSuchAlgorithmException caught!");
			System.exit(-1);
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}

		byte[] byteArray = messageDigest.digest();

		StringBuffer md5StrBuff = new StringBuffer();

		for (int i = 0; i < byteArray.length; i++) {
			if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
				md5StrBuff.append("0").append(
						Integer.toHexString(0xFF & byteArray[i]));
			else
				md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
		}

		return md5StrBuff.toString();
	}
}