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src/com/hellogithub/dao/UserDao.java

@@ -314,7 +314,7 @@ public class UserDao {
     public void insertUserAvatar(String username,String url){
         Connection conn = null;
         PreparedStatement preparedStatement = null;
-        String sql = "insert into user set userAvatar = ? where userName = ? AND isValid = 1;";
+        String sql = "UPDATE user set userAvatar = ''+?+'' WHERE userName = ? AND isValid = 1;";
         try{
             conn = JdbcUtils.getConnection();
             preparedStatement = conn.prepareStatement(sql);

src/com/hellogithub/servlet/userAvatarServlet.java

@@ -66,5 +66,4 @@ public class userAvatarServlet extends HttpServlet {
         setResult(200, msg, writer);
     }
 }
-    }
+
-}