请求路径改成相对路径

将post请求的路径改成相对路径，测试成功。

code/java/car_dealer/src/main/webapp/file_upload.html

@@ -2,7 +2,7 @@
  * @Author: Kane
  * @Date: 2022-09-29 16:33:30
  * @LastEditors: Kane
- * @LastEditTime: 2022-09-30 10:26:34
+ * @LastEditTime: 2022-09-30 21:34:30
  * @FilePath: \car_dealer\src\main\webapp\file_upload.html
  * @Description: 
  * 
@@ -51,8 +51,7 @@
         </div>
     </body>
     <script>
-        const reqeustURL =
-            "http://localhost:8080/cardealer/upload/upload_file.do";
+        const reqeustURL = "upload/upload_file.do";
         const btnUpload = document.getElementById("btnUpload");
 
         function fileUploadChange() {
@@ -64,8 +63,6 @@
             const uploadForm = document.getElementById("uploadform");
             const form = new FormData(uploadForm);
 
-            //form.append("myfile", file);
-
             const xhr = new XMLHttpRequest();
 
             xhr.upload.onprogress = function (event) {
@@ -79,10 +76,9 @@
             };
 
             xhr.onload = function (event) {
-                //let result = JSON.parse(xhr.responseText);
+                let result = JSON.parse(xhr.responseText);
 
-                console.log(xhr.responseText);
-                //console.log(result);
+                console.log(result);
             };
 
             xhr.open("post", reqeustURL, true);