[英]Upload images in Spring MVC using JavaScript for preview
我正在編寫一個Spring MVC應用程序,用於將圖像上傳到服務器。 我的Java部分工作正常,但是我在這里需要JavaScript,但我對它不是很熟悉,對不起,如果我提出明顯的要求。
當我在視圖中僅使用具有以下html格式的控制器時,一切正常:
<form method="POST" action="upload" enctype="multipart/form-data">
<input type="file" name="file" multiple><br/>
<input type="submit" value="Upload">
</form>
我只是在我的控制器中使用@RequestMapping攔截並獲取文件。
但是我需要在上傳之前預覽我的照片。 我發現了以下代碼,它也很好用:
<html>
<head>
<style type="text/css">.thumb-image{float:left;width:100px;position:relative;padding:5px;}.selectedItem{border:2px solid blue;}</style>
</head>
<body>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<div id="wrapper" style="margin-top: 20px;">
<p><b>For deleting thumb-image: click on image to select and press delete button.</b> </p>
<input id="fileUpload" multiple="multiple" type="file"/>
<button id="btnDelete">Delete</button>
<div id="image-holder">
</div>
<br/><br/>
</div>
<script>
$(document).ready(function() {
$("#image-holder").on('click','.thumb-image',function(){
$(this).toggleClass("selectedItem");
});
$("#btnDelete").on("click",function(){
$(".selectedItem").remove();
});
$("#fileUpload").on('change', function() {
//Get count of selected files
var countFiles = $(this)[0].files.length;
var imgPath = $(this)[0].value;
var extn = imgPath.substring(imgPath.lastIndexOf('.') + 1).toLowerCase();
var image_holder = $("#image-holder");
image_holder.empty();
if (extn == "gif" || extn == "png" || extn == "jpg" || extn == "jpeg") {
if (typeof(FileReader) != "undefined") {
//loop for each file selected for uploaded.
for (var i = 0; i < countFiles; i++)
{
var reader = new FileReader();
reader.onload = function(e) {
$("<img />", {
"src": e.target.result,
"class": "thumb-image"
}).appendTo(image_holder);
}
image_holder.show();
reader.readAsDataURL($(this)[0].files[i]);
}
} else {
alert("This browser does not support FileReader.");
}
} else {
alert("Pls select only images");
}
});
});
</script>
</body>
</html>
但是我現在不知道如何將其傳遞給我的控制器。 我應該在哪里放置action="upload"
或其他東西來使其正常工作? 這里沒有表格,也沒有提交按鈕。 謝謝!
嘗試這個;)
<html> <head> <style type="text/css">.thumb-image{float:left;width:100px;position:relative;padding:5px;}.selectedItem{border:2px solid blue;}</style> </head> <body> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script> <div id="wrapper" style="margin-top: 20px;"> <p><b>For deleting thumb-image: click on image to select and press delete button.</b> </p> <form method="POST" action="upload" enctype="multipart/form-data"> <input id="fileUpload" multiple="multiple" type="file"/> <input type="submit" value="Upload"> <button id="btnDelete">Delete</button> </form> <div id="image-holder"> </div> <br/><br/> </div> <script> $(document).ready(function() { $("#image-holder").on('click','.thumb-image',function(){ $(this).toggleClass("selectedItem"); }); $("#btnDelete").on("click",function(){ $(".selectedItem").remove(); }); $("#fileUpload").on('change', function() { //Get count of selected files var countFiles = $(this)[0].files.length; var imgPath = $(this)[0].value; var extn = imgPath.substring(imgPath.lastIndexOf('.') + 1).toLowerCase(); var image_holder = $("#image-holder"); image_holder.empty(); if (extn == "gif" || extn == "png" || extn == "jpg" || extn == "jpeg") { if (typeof(FileReader) != "undefined") { //loop for each file selected for uploaded. for (var i = 0; i < countFiles; i++) { var reader = new FileReader(); reader.onload = function(e) { $("<img />", { "src": e.target.result, "class": "thumb-image" }).appendTo(image_holder); } image_holder.show(); reader.readAsDataURL($(this)[0].files[i]); } } else { alert("This browser does not support FileReader."); } } else { alert("Pls select only images"); } }); }); </script> </body> </html>
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