Add package assignment1

assignment1/Encrypt.java

@@ -0,0 +1,30 @@
+package assignment1;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+//对字符串进行加密
+public class Encrypt {
+	public static String MD5(String str) {
+		try {
+			MessageDigest md = MessageDigest.getInstance("MD5");
+			md.update(str.getBytes());
+			byte[] b = md.digest();
+			StringBuffer sb = new StringBuffer();
+			for (byte c : b) {
+				int val = ((int) c) & 0xff;
+				if (val < 16)
+					sb.append("0");
+				sb.append(Integer.toHexString(val));
+			}
+			return sb.toString().toUpperCase();
+		} catch (NoSuchAlgorithmException e) {
+			e.printStackTrace();
+		}
+		return null;
+	}
+
+	public static void main(String[] args) {
+		System.out.println(MD5("123456"));
+	}
+}