Through js control, set a Boolean value for judgment. Change the value after submission, and then submit again and it will not pass.
<!DOCTYPE HTML><html>
<head>
<title>Form表单</title>
</head>
<script type="text/javascript">
var isCommitted = false;//表单是否已经提交标识，默认为false
function dosubmit(){
if(isCommitted==false){
isCommitted = true;//提交表单后，将表单是否已经提交标识设置为true
return true;//返回true让表单正常提交
}else{ return false;//返回false那么表单将不提交
}
} </script>
<body>
<form action="${pageContext.request.contextPath}/servlet/DoFormServlet" onsubmit="return dosubmit()" method="post">
用户名：<input type="text" name="username">
<input type="submit" value="提交" id="submit">
</form>
</body>
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