diff --git a/src/com/landaiqing/filter/UserSessionFilter.java b/src/com/landaiqing/filter/UserSessionFilter.java
index f24edf1..3b8f191 100644
--- a/src/com/landaiqing/filter/UserSessionFilter.java
+++ b/src/com/landaiqing/filter/UserSessionFilter.java
@@ -19,7 +19,7 @@ import java.io.IOException;
  */
 @WebFilter("/*")// 过滤器所有的请求
 public class UserSessionFilter implements Filter {
-    private String[] excludeUrls = new String[]{"/login", "/register", "/VerifycodeServlet"};
+    private String[] excludeUrls = new String[]{"/login", "/register", "/VerifycodeServlet","/ExUserNameServlet"};
 
     @Override
     public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
diff --git a/src/com/landaiqing/servlet/ExUserNameServlet.java b/src/com/landaiqing/servlet/ExUserNameServlet.java
new file mode 100644
index 0000000..3377daf
--- /dev/null
+++ b/src/com/landaiqing/servlet/ExUserNameServlet.java
@@ -0,0 +1,42 @@
+package com.landaiqing.servlet;
+
+
+import com.landaiqing.entity.UserEntity;
+import com.landaiqing.service.UserService;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.annotation.WebServlet;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+
+/**
+ * http://localhost:8080/mayikt_session_war_exploded/exUserNameServlet?name=1
+ * @author 余胜军
+ * @ClassName ExUserNameServlet
+ * @qq 644064779
+ * @addres www.mayikt.com
+ * 微信:yushengjun644
+ */
+@WebServlet("/exUserNameServlet")
+public class ExUserNameServlet extends HttpServlet {
+
+    private UserService UserService = new UserService();
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setContentType("text/html;charset=utf-8");
+        //1.获取到用户输入的userName参数值
+        String userName = req.getParameter("userName");
+        //2.调用数据库根据userName查询用户名称是否存在
+        UserEntity mayiktUserEntity = UserService.findByUserName(userName);
+        PrintWriter writer = resp.getWriter();
+        if (mayiktUserEntity != null) {
+            writer.print("该用户" + userName + "已经存在的 无法注册!");
+        }
+        writer.close();
+    }
+}
+
diff --git a/web/register.jsp b/web/register.jsp
index 23e7c9e..ab014f1 100644
--- a/web/register.jsp
+++ b/web/register.jsp
@@ -10,12 +10,12 @@
 <html>
 <head>
     <title>注册页面</title>
-    <form action="/JavaWeb_Login_Register_war_exploded/register" method="post">
-        <label>用户名: </label><input type="text" name="userName"/><br>
+    <form action="${pageContext.request.contextPath}/register" method="post">
+        <label>用户名: </label><input type="text" name="userName" onkeyup="mayiktAxios(this)"/><br>
         <label>密&nbsp&nbsp&nbsp码: </label><input type="password" name="userPwd"/><br>
         <label>验证码: </label><input type="text" name="code"/><img id="exchangecode" src="VerifycodeServlet">
         <a id="ecode" href="#">看不清？换一张图片</a><br>
-        <span style="color: red">${errorMsg}</span>
+        <span id="error" style="color: red">${errorMsg}</span>
         <input type="submit" value="注册"/>
     </form>
     <script type="text/javascript">
@@ -37,5 +37,26 @@
         }
 
     </script>
+    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
+    <script>
+        function mayiktAxios(object) {
+            // 1.接受用户输入的userName
+            var userName = object.value;
+            // 2.使用Axios 发送ajax请求验证 userName是否存在的
+            axios({
+                // 请求方式
+                method: 'GET',
+                // 请求的地址
+                url: 'http://localhost:8080${pageContext.request.contextPath}/exUserNameServlet',
+                // URL 中的查询参数
+                params: {
+                    userName: userName,
+                }
+            }).then(function (result) {
+                //定位 span  id 名称 error 修改
+                document.getElementById("error").innerText = result.data;
+            })
+        }
+    </script>
 </head>
 </html>
\ No newline at end of file
