md5.java

java编写MD5加密生成例子

// MD5密码生成例子


import java.security.MessageDigest;
public class MD5 {
 	private final static String[] hexDigits = {
	 	"0", "1", "2", "3", "4", "5", "6", "7",
	 	"8", "9", "a", "b", "c", "d", "e", "f"};
	/**
	* 转换字节数组为16进制字串
	* @param b 字节数组
	* @return 16进制字串
	*/
	public static String byteArrayToHexString(byte[] b) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++) 
		{
			resultSb.append(byteToHexString(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];  
	}
	public static String MD5Encode(String origin) 
	{    
		String resultString = null;    
		try 
		{      
			resultString=new String(origin);      
			MessageDigest md = MessageDigest.getInstance("MD5");
			resultString=byteArrayToHexString(md.digest(resultString.getBytes()));    
		}
		catch (Exception ex) 
		{    
		}    
		return resultString;
	}
	public static void main(String[] args)
	{    
		//加密串
		char[] s_myinfo = {'9','9','2','3','4','4',				
     			0,0,0,0,0,0,0,0,0,									
     			'0','4','3','4','4',							
     			'0','6','1','3','1','8','5','6','4','1'				
     			};
     	
     	String str = new String(s_myinfo);
     	
     	System.out.println("生成的加密串");
     	System.out.println(MD5Encode(str));  
	}
}