testmd5.java

常用的java控件使用实例源代码

import java.security.MessageDigest;

public class testMD5{
	public testMD5() {
		
	}
	
	private final static String[] hexDigits = {
		"0","1","2","3","4","5","6",
		"7","8","9","a","b","c","d","e","f"
	};
	
	public static String byteArrToString (byte[] b) {
		StringBuffer resultSb = new StringBuffer();
		for(int i = 0; i < b.length; i ++) {
		  resultSb.append(byteToHexString(b[i]));
			//resultSb.append(byteToNumString(b[i]));
		}
		return resultSb.toString();
	}
	
	private static String byteToHexString (byte b) {
		int n = b;
		if(n < 0) {
			n = 256 + n;
		}
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}
	
	private static String byteToNumString ( byte b) {
		int _b = b ;
		if(_b < 0){
			_b = 256 + _b;
		}
		return String.valueOf(b);
	}
	
	public static String MD5Encode(String origin) {
		String resultString = null;
		try {
			resultString = new String (origin);
			MessageDigest md = MessageDigest.getInstance("md5");
			resultString = byteArrToString(md.digest(resultString.getBytes()));
		}
		catch (Exception e) {
			
		}
		
		return resultString;
	}
	
	public static void main(String[] args) {
		testMD5 md5encrypt = new testMD5();
		System.out.println(MD5Encode("jiqing"));
	}
}