代码如下

<span style="font-size:18px;">import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {

	public static void main(String[] args) {
		Main Main = new Main();
		System.out.println(Main.encryption("xiaowen123"));
	}

	/**
	 * 
	 * @param plainText
	 *            明文
	 * @return 32位密文
	 */
	public String encryption(String plainText) {
		String md5 = new String();
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			md.update(plainText.getBytes());
			byte b[] = md.digest();

			int i;

			StringBuffer buf = new StringBuffer("");
			for (int offset = 0; offset < b.length; offset++) {
				i = b[offset];
				if (i < 0)
					i += 256;
				if (i < 16)
					buf.append("0");
				buf.append(Integer.toHexString(i));
			}

			md5 = buf.toString();

		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		return md5;
	}
}</span>

java32为md5加密