tools.java

一个仿qq的程序源码 一个用纯java开发的

package qianqian.p2pchat.tools;

import java.util.Calendar;
import java.util.Locale;
import java.util.TimeZone;

public final class Tools {
	//md5加密
	public static String MD5(String str) {
		StringBuffer buf = new StringBuffer("");
		try {
			java.security.MessageDigest md5 = java.security.MessageDigest
					.getInstance("MD5");
			md5.update(str.getBytes());
			byte[] b = md5.digest();
			for (int offset = 0, i = 0; offset < b.length; offset++) {
				i = b[offset];
				if (i < 0)
					i += 256;
				if (i < 16)
					buf.append("0");
				buf.append(Integer.toHexString(i));
			}
		} catch (java.security.NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		return buf.toString();
	}
	// 获取时间字符串
	public static String getTimeInfo() {
		Calendar c = Calendar.getInstance(TimeZone.getTimeZone("GMT+8"),
				Locale.CHINA);
		int year = c.get(Calendar.YEAR);
		int month = c.get(Calendar.MONTH) + 1;
		int day = c.get(Calendar.DAY_OF_MONTH);
		int hours = c.get(Calendar.HOUR_OF_DAY);
		int minutes = c.get(Calendar.MINUTE);
		int seconds = c.get(Calendar.SECOND);
		return (year + "-" + month + "-" + day + "  " + hours + ":" + minutes
				+ ":" + seconds);
	}
}