md5.java

使用J2EE Struts开发的房地产信息咨询系统

package building;

import java.security.*;

public final class MD5 
{
	public static String comuteDigest(String name)
	{
		MessageDigest messageDigest;
		byte[] name_b =name.getBytes();
		String newName="";
		
		try
	    {
			messageDigest= MessageDigest.getInstance("SHA-1");//你把这个SHA-1换为md5就可以了。
			messageDigest.reset();//重置摘要
			messageDigest.update(name_b);//更新摘要
			byte[] hash=messageDigest.digest();//计算摘要
	
			for(int i=0;i<hash.length;i++)
			{
				int v = hash[i] & 0xFF;//转换为十六进制
				if (v < 16) 
				{
					newName += "0";
				}//End of if
				
				newName += Integer.toString(v, 16).toUpperCase();
			}//End of for
	    }//End of try
		catch (NoSuchAlgorithmException e)
		{
			System.out.println(e);
	    }//End of catch

		return newName;
	}//End of comuteDigest

}//End of class MD5