first commit

src/main/java/com/peanut/common/utils/MD5Util.java

@@ -0,0 +1,45 @@
+package com.peanut.common.utils;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+public class MD5Util {
+
+    private static MessageDigest mdigest = null;
+    private static char digits[] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
+    private static MessageDigest getMdInst(){
+        if(null == mdigest){
+            try{
+                mdigest = MessageDigest.getInstance("MD5");
+            }catch(NoSuchAlgorithmException e){
+                e.printStackTrace();
+            }
+        }
+        return mdigest;
+    }
+
+    public static String encode(String s){
+        if(null == s){
+            return "";
+        }
+
+        try{
+            byte[] bytes = s.getBytes();
+            getMdInst().update(bytes);
+            byte[] md = getMdInst().digest();
+            int j = md.length;
+            char str[] = new char[j * 2];
+            int k = 0;
+            for(int i = 0; i < j; i++) {
+                byte byte0 = md[i];
+                str[k++] = digits[byte0 >>> 4 & 0xf];
+                str[k++] = digits[byte0 & 0xf];
+            }
+            return new String(str);
+        }catch(Exception e){
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+}