用来测试Websocket的时候，写了一个测试的Html demo
可以发送文本，文件（这里用的是图片文件，input 选择图片，然后回显，再将其转为Base64，然后传递一个json的字符串）
<!DOCTYPE html>
<title>WebSocket</title>
<h2>HTML Websocket Client</h2>
<body>
<button onclick="connectSocketFun()">连接websocket</button><br><br>
<button onclick="disconnectSocketFun()">断开连接</button><br><br>
<input type="text" name="firstname" value="发送的数据">
<br><br>
<button onclick="sendTextFun()">发送文本</button><br><br>
<div>
<span>
<span></span>
<input type="file" onchange="handleFiles(this.files)">
</span>
</div>
<div class="addBorder" id="imgDiv">
<img id="imgContent" style="height: 300px; 300px;">
</div><br>
<button onclick="sendFileFun()">发送文件</button><br><br>
<div id="output"></div>
</body>
<script>
var ws = null;
var base64 = '';
function handleFiles(files) {
if (files.length) {
let file = files[0];
let reader = new FileReader();
reader.onload = function () {
var decu = document.getElementById('imgContent');
decu.src = this.result;
base64 = this.result;
};
reader.readAsDataURL(file);
}
}
function connectSocketFun() {
alert("连接websocket");
ws = new WebSocket("ws://localhost:8080/hello");
console.log(ws.readyState);
ws.onopen = function (e) {
log("Connected");
}
ws.onclose = function (e) {
log("Disconnected: " + e.reason);
}
ws.onerror = function (e) {
log("Error ");
}
ws.onmessage = function (e) {
log("Message received: " + e.data);
}
console.log(ws.readyState);
}
function disconnectSocketFun() {
ws.close();
alert("断开连接websocket");
}
function sendTextFun() {
ws.send("发送文本");
alert("发送文本");
}
function sendFileFun() {
var data = {
name: 'test文件名',
base64: base64
}
var dataJson = JSON.stringify(data);
ws.send(dataJson);
alert("发送文件");
}
function log(s) {
var p = document.createElement("p");
p.style.wordWrap = "break-word";
p.textContent = s;
output.appendChild(p);
}
</script>
</html>