研究异步文件上传！

code/java/car_dealer/.hintrc

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+{
+  "extends": [
+    "development"
+  ],
+  "hints": {
+    "axe/forms": [
+      "default",
+      {
+        "label": "off"
+      }
+    ]
+  }
+}

code/java/car_dealer/src/main/webapp/css/kane.css

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+html {
+    --backupground-color: #f7f7f7;
+    --btn-color-blue: #307dbe;
+    --btn-color-yellow: #f7b24d;
+    --btn-color-green: #5bad60;
+    --btn-color-red: #e56651;
+    --btn-font-color: #fff;
+    background-color: #eee;
+}
+
+#root,
+#app {
+    height: 100vh;
+    width: 100vw;
+    position: fixed;
+    padding: 50px;
+    /* font-size: 0; */
+    overflow: auto;
+}
+
+#root,
+#app * + * {
+    margin-top: 15px;
+}
+
+hr {
+    background-color: steelblue;
+    border: none;
+    height: 3px;
+}
+
+.test {
+    width: 110vw;
+    height: 100vh;
+    border: 1px solid red;
+    overflow: auto;
+}
+
+button {
+    padding: 5px 10px;
+    background-color: var(--btn-color-red);
+    color: var(--btn-font-color);
+    width: 10em;
+    border: none;
+    border-radius: 0.25em;
+    font-size: 1.5rem;
+}
+
+button + button {
+    margin-left: 0.5em;
+}
+
+button:active {
+    background-color: var(--btn-font-color);
+    color: var(--btn-color-red);
+}
+
+input {
+    border: none;
+    outline: solid 2px #e56651;
+    font-size: 2rem;
+}
+
+label {
+    display: inline-block;
+    font-size: 2rem;
+    margin-top: 15px;
+}

code/java/car_dealer/src/main/webapp/css/main_frame.css

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+#app {
+    width: 100vw;
+    height: 100vh;
+    padding: 0px;
+    margin: 0px;
+    display: flex;
+    flex-direction: column;
+}
+
+#header {
+    flex-basis: 50px;
+    border: 1px solid red;
+    max-height: 50px;
+}
+
+#main {
+    flex-grow: 1;
+    border: 1px solid red;
+}
+
+#footer {
+    flex-basis: 100px;
+    max-height: 100px;
+    border: 1px solid red;
+}

code/java/car_dealer/src/main/webapp/css/normalize.css

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+/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */
+
+/* Document
+   ========================================================================== */
+
+/**
+ * 1. Correct the line height in all browsers.
+ * 2. Prevent adjustments of font size after orientation changes in iOS.
+ */
+
+html {
+  line-height: 1.15; /* 1 */
+  -webkit-text-size-adjust: 100%; /* 2 */
+}
+
+/* Sections
+   ========================================================================== */
+
+/**
+ * Remove the margin in all browsers.
+ */
+
+body {
+  margin: 0;
+}
+
+/**
+ * Render the `main` element consistently in IE.
+ */
+
+main {
+  display: block;
+}
+
+/**
+ * Correct the font size and margin on `h1` elements within `section` and
+ * `article` contexts in Chrome, Firefox, and Safari.
+ */
+
+h1 {
+  font-size: 2em;
+  margin: 0.67em 0;
+}
+
+/* Grouping content
+   ========================================================================== */
+
+/**
+ * 1. Add the correct box sizing in Firefox.
+ * 2. Show the overflow in Edge and IE.
+ */
+
+hr {
+  box-sizing: content-box; /* 1 */
+  height: 0; /* 1 */
+  overflow: visible; /* 2 */
+}
+
+/**
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+pre {
+  font-family: monospace, monospace; /* 1 */
+  font-size: 1em; /* 2 */
+}
+
+/* Text-level semantics
+   ========================================================================== */
+
+/**
+ * Remove the gray background on active links in IE 10.
+ */
+
+a {
+  background-color: transparent;
+}
+
+/**
+ * 1. Remove the bottom border in Chrome 57-
+ * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
+ */
+
+abbr[title] {
+  border-bottom: none; /* 1 */
+  text-decoration: underline; /* 2 */
+  text-decoration: underline dotted; /* 2 */
+}
+
+/**
+ * Add the correct font weight in Chrome, Edge, and Safari.
+ */
+
+b,
+strong {
+  font-weight: bolder;
+}
+
+/**
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+code,
+kbd,
+samp {
+  font-family: monospace, monospace; /* 1 */
+  font-size: 1em; /* 2 */
+}
+
+/**
+ * Add the correct font size in all browsers.
+ */
+
+small {
+  font-size: 80%;
+}
+
+/**
+ * Prevent `sub` and `sup` elements from affecting the line height in
+ * all browsers.
+ */
+
+sub,
+sup {
+  font-size: 75%;
+  line-height: 0;
+  position: relative;
+  vertical-align: baseline;
+}
+
+sub {
+  bottom: -0.25em;
+}
+
+sup {
+  top: -0.5em;
+}
+
+/* Embedded content
+   ========================================================================== */
+
+/**
+ * Remove the border on images inside links in IE 10.
+ */
+
+img {
+  border-style: none;
+}
+
+/* Forms
+   ========================================================================== */
+
+/**
+ * 1. Change the font styles in all browsers.
+ * 2. Remove the margin in Firefox and Safari.
+ */
+
+button,
+input,
+optgroup,
+select,
+textarea {
+  font-family: inherit; /* 1 */
+  font-size: 100%; /* 1 */
+  line-height: 1.15; /* 1 */
+  margin: 0; /* 2 */
+}
+
+/**
+ * Show the overflow in IE.
+ * 1. Show the overflow in Edge.
+ */
+
+button,
+input { /* 1 */
+  overflow: visible;
+}
+
+/**
+ * Remove the inheritance of text transform in Edge, Firefox, and IE.
+ * 1. Remove the inheritance of text transform in Firefox.
+ */
+
+button,
+select { /* 1 */
+  text-transform: none;
+}
+
+/**
+ * Correct the inability to style clickable types in iOS and Safari.
+ */
+
+button,
+[type="button"],
+[type="reset"],
+[type="submit"] {
+  -webkit-appearance: button;
+}
+
+/**
+ * Remove the inner border and padding in Firefox.
+ */
+
+button::-moz-focus-inner,
+[type="button"]::-moz-focus-inner,
+[type="reset"]::-moz-focus-inner,
+[type="submit"]::-moz-focus-inner {
+  border-style: none;
+  padding: 0;
+}
+
+/**
+ * Restore the focus styles unset by the previous rule.
+ */
+
+button:-moz-focusring,
+[type="button"]:-moz-focusring,
+[type="reset"]:-moz-focusring,
+[type="submit"]:-moz-focusring {
+  outline: 1px dotted ButtonText;
+}
+
+/**
+ * Correct the padding in Firefox.
+ */
+
+fieldset {
+  padding: 0.35em 0.75em 0.625em;
+}
+
+/**
+ * 1. Correct the text wrapping in Edge and IE.
+ * 2. Correct the color inheritance from `fieldset` elements in IE.
+ * 3. Remove the padding so developers are not caught out when they zero out
+ *    `fieldset` elements in all browsers.
+ */
+
+legend {
+  box-sizing: border-box; /* 1 */
+  color: inherit; /* 2 */
+  display: table; /* 1 */
+  max-width: 100%; /* 1 */
+  padding: 0; /* 3 */
+  white-space: normal; /* 1 */
+}
+
+/**
+ * Add the correct vertical alignment in Chrome, Firefox, and Opera.
+ */
+
+progress {
+  vertical-align: baseline;
+}
+
+/**
+ * Remove the default vertical scrollbar in IE 10+.
+ */
+
+textarea {
+  overflow: auto;
+}
+
+/**
+ * 1. Add the correct box sizing in IE 10.
+ * 2. Remove the padding in IE 10.
+ */
+
+[type="checkbox"],
+[type="radio"] {
+  box-sizing: border-box; /* 1 */
+  padding: 0; /* 2 */
+}
+
+/**
+ * Correct the cursor style of increment and decrement buttons in Chrome.
+ */
+
+[type="number"]::-webkit-inner-spin-button,
+[type="number"]::-webkit-outer-spin-button {
+  height: auto;
+}
+
+/**
+ * 1. Correct the odd appearance in Chrome and Safari.
+ * 2. Correct the outline style in Safari.
+ */
+
+[type="search"] {
+  -webkit-appearance: textfield; /* 1 */
+  outline-offset: -2px; /* 2 */
+}
+
+/**
+ * Remove the inner padding in Chrome and Safari on macOS.
+ */
+
+[type="search"]::-webkit-search-decoration {
+  -webkit-appearance: none;
+}
+
+/**
+ * 1. Correct the inability to style clickable types in iOS and Safari.
+ * 2. Change font properties to `inherit` in Safari.
+ */
+
+::-webkit-file-upload-button {
+  -webkit-appearance: button; /* 1 */
+  font: inherit; /* 2 */
+}
+
+/* Interactive
+   ========================================================================== */
+
+/*
+ * Add the correct display in Edge, IE 10+, and Firefox.
+ */
+
+details {
+  display: block;
+}
+
+/*
+ * Add the correct display in all browsers.
+ */
+
+summary {
+  display: list-item;
+}
+
+/* Misc
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 10+.
+ */
+
+template {
+  display: none;
+}
+
+/**
+ * Add the correct display in IE 10.
+ */
+
+[hidden] {
+  display: none;
+}

code/java/car_dealer/src/main/webapp/css/product_form.css

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+.panel {
+    display: flex;
+    justify-content: center;
+    align-items: center;
+}
+
+.main_form {
+    height: 50vh;
+    width: 50vw;
+    border: 1px solid red;
+}

code/java/car_dealer/src/main/webapp/css/root.css

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+:root {
+    font-size: 1em;
+    box-sizing: border-box;
+}
+
+*,
+*::before,
+*::after {
+    margin: 0;
+    padding: 0;
+    box-sizing: inherit;
+}
+
+body {
+    font-family: Arial, Helvetica, sans-serif;
+}
+
+.pointer {
+    cursor: pointer;
+}

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

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+<!--
+ * @Author: Kane
+ * @Date: 2022-09-29 16:33:30
+ * @LastEditors: Kane
+ * @LastEditTime: 2022-09-29 16:47:19
+ * @FilePath: \car_dealer\src\main\webapp\file_upload.html
+ * @Description: 
+ * 
+ * Copyright (c) ${2022} by Kane, All Rights Reserved. 
+-->
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8" />
+        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <title>上传文件测试！</title>
+        <link rel="stylesheet" href="css/root.css" />
+        <link rel="stylesheet" href="css/normalize.css" />
+        <link rel="stylesheet" href="css/kane.css" />
+    </head>
+    <body>
+        <div id="app">
+            <form enctype="multipart/form-data">
+                <input
+                    type="file"
+                    name="upload"
+                    id="upload"
+                    style="display: none"
+                    onchange="fileUploadChange()"
+                />
+                <input
+                    type="text"
+                    id="upload_text"
+                    readonly
+                    onclick="upload.click()"
+                />
+            </form>
+            <button>上传</button>
+        </div>
+    </body>
+    <script>
+        function fileUploadChange() {
+            document.getElementById("upload_text").value =
+                document.getElementById("upload").value;
+        }
+    </script>
+</html>