JAVA 生成MD5

import java.security.*;

public class MD5 {
	public static String convert(String s) {
		char hexChars[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
				'a', 'b', 'c', 'd', 'e', 'f' };
		try {
			byte[] bytes = s.getBytes();
                       //如果使用SHA1算法加密 这个地方把MD5 改成 SHA-1即可
			MessageDigest md = MessageDigest.getInstance("MD5");                            
			md.update(bytes);
			bytes = md.digest();
			int j = bytes.length;
			char[] chars = new char[j * 2];
			int k = 0;
			for (int i = 0; i < bytes.length; i++) {
				byte b = bytes[i];
				chars[k++] = hexChars[b >>> 4 & 0xf];
				chars[k++] = hexChars[b & 0xf];
			}
			return new String(chars);
		} catch (Exception e) {
			return null;
		}
	}

	public static void main(String[] args) {
		System.out.println(MD5.convert("0123456789"));
	}
}