伙计我是编程新手,我真的不知道如何将div中显示的照片保存到服务器。我正在使用java应用程序,我试图在div上显示图像,然后将其保存在服务器上。据我所知,由于客户端和服务器的兼容性,无法在jsp或servlet中声明javascript变量。我试图通过ajax传递url,但由于base64长字符串,它没有显示在服务器上。我想我们不能将这么长的字符串传递给jsp或servlet页面。有没有其他方法可以传递字符串或将图像保存到服务器?
function GetXmlHttpObject() {
var xmlHttp=null;
try {
// Firefox, Opera 8.0+, Safari
xmlHttp=new XMLHttpRequest();
}
catch (e) {
//Internet Explorer
try {
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e) {
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
}
return xmlHttp;
}
function ajax() {
xmlHttp=GetXmlHttpObject();
var url="/ServletExten/XmlServletGen";
url=url+"?datax=" +cordXSend +"&datay=" +cordYSend +"&sizew=" +canvasWidth +"&sizeh=" +canvasHeight ;
alert(url);
xmlHttp.open("POST",url,true);
xmlHttp.send(null);
}
答案 0 :(得分:7)
创建一个类似的输入元素,
<form id="fileupf" action="fileup.php" method="post" enctype="multipart/form-data">
<input type="file" id="fileup" name="file" accept="image/*" >
</form>
然后在ajax中,
$('#fileupf').ajaxForm({
complete: function(xhr) {
alert("Upload complete");
}
});
在php中,
<?php
$target_path = "uploaded_images/";
$file_name = $_FILES["file"]["name"];
$random_digit=rand(0000,9999);
$new_file_name=$random_digit.$file_name;
$target_path = $target_path . basename( $new_file_name);
?>
如果要保存画布图,那么
的Javascript,
var canvasData = canvas.toDataURL("image/png");
var ajax = new XMLHttpRequest();
ajax.open("POST",'save.php',false);
ajax.setRequestHeader('Content-Type', 'application/upload');
ajax.send(canvasData);
PHP,
<?php
if (isset($GLOBALS["HTTP_RAW_POST_DATA"]))
{
// Get the data
$imageData=$GLOBALS['HTTP_RAW_POST_DATA'];
$filteredData=substr($imageData, strpos($imageData, ",")+1);
$unencodedData=base64_decode($filteredData);
$random_digit=md5(uniqid(mt_rand(), true));
$fp = fopen( 'yourfolder/new'.$random_digit.'.png', 'wb' );
fwrite( $fp, $unencodedData);
fclose( $fp );
}
?>