codeutil.java

整理的3G视线常用工具整理。里面包含了大量有用的代码

package com.gggeye.util;

public class CodeUtil {
	
	public final String md5(){
		File file = new File("d:/1.dat");
		FileInputStream fs = new FileInputStream(file);
		BufferedInputStream bi = new BufferedInputStream(fs);
		ByteArrayOutputStream bo = new ByteArrayOutputStream();
		byte[] b = new byte[bi.available()];
		int i;
		while ((i = bi.read(b, 0, b.length)) != -1)
		{
		bo.write(b, 0, i);
		}
		bo.close();
		System.out.print(Md5.MD5(new String(bo.toByteArray())));

		public final static String MD5(String s)
		{
		char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
		try
		{
		byte[] strTemp = s.getBytes();
		MessageDigest mdTemp = MessageDigest.getInstance("MD5");
		mdTemp.update(strTemp);
		byte[] md = mdTemp.digest();
		int j = md.length;
		char str[] = new char[j * 2];
		int k = 0;
		for (int i = 0; i < j; i++)
		{
		byte byte0 = md;
		str[k++] = hexDigits[byte0 >>> 4 & 0xf];
		str[k++] = hexDigits[byte0 & 0xf];
		}
		return new String(str);
		}
		catch (Exception e)
		{
		return null;
		}
		}

	}
	
}