digestpass.java

JAVA案例开发集锦源代码 袁然 郑自国编

package seven;

/**
 * @author wangmj
 * @mail <a mailto="[e-mail]"> 2005-5-9 2005
 * 下面一段程序计算一段字符串的消息摘要 
 * DigestPass.java
 */
import java.security.MessageDigest;

public class DigestPass {
	public static void main(String[] args) throws Exception {
		String str = "Hello,I sent to you 800 yuan.";
		MessageDigest md = MessageDigest.getInstance("MD5");
		//常用的有MD5,SHA算法等
		md.update(str.getBytes("UTF-8"));//传入原始字串
		byte[] re = md.digest();//计算消息摘要放入byte数组中
		//下面把消息摘要转换为字符串
		String result = "";
		for (int i = 0; i < re.length; i++) {
			result += Integer.toHexString((0x000000ff & re[i]) | 0xffffff00)
					.substring(6);
		}
		System.out.println(result);
		//07a9745449ca5296557f56b8172e391f
	}
}