client页面上传到上传到服务器并且在服务器保存
xhtml页面
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Insert title here</title>
<link rel="stylesheet" type="text/css" href="imageupload.css" />
<script type=‘text/javascript‘ src=‘/Qpid/dwr/engine.js‘></script>
<script type=‘text/javascript‘ src=‘/Qpid/dwr/interface/ProfileBeanMock.js‘></script>
<script type="text/javascript" src="scripts/jquery.min.js"></script>
<script type=‘text/javascript‘ src=‘/Qpid/dwr/util.js‘></script>
<script type="text/javascript">
var byteimage;
function copyText(){
//alert("dasdas");
ProfileBeanMock.saveImage(byteimage, callback);
}
function callback(data){
// alert(data);
window.opener.location.reload();
window.close();
}
$(document).ready(function () {
var fileInput = document.getElementById(‘fileInput‘);
var fileDisplayArea = document.getElementById(‘fileDisplayArea‘);
fileInput.addEventListener(‘change‘, function(e) {
// Put the rest of the demo code here.
var file = fileInput.files[0];
var imageType = /image.*/;
if (file.type.match(imageType)) {
var reader = new FileReader();
reader.onload = function(e) {
fileDisplayArea.innerHTML = "";
// Create a new image.
var img = new Image();
// Set the img src property using the data URL.
img.src = reader.result;
byteimage=reader.result;
// Add the image to the page.
fileDisplayArea.appendChild(img);
}
reader.readAsDataURL(file);
} else {
fileDisplayArea.innerHTML = "File not supported!";
}
});
});//$(document)
</script>
</head>
<body>
<div id="page-wrapper">
<h1>Image File Reader</h1>
<div>
Select an image file: <input type="file" id="fileInput"></input>
<button onclick="copyText()">Copy Text</button>
</div>
<div id="fileDisplayArea"></div>
</div>
</body>
</html>
这里用到了dwr框架，主要是异步将图片传入server的javabean中，js不能访问到client机器上图片的真实路径，所以要用到FileReader（）这个对象。服务器端的主要功能是将图片的data URL流变成图片然后保存，具体代码：
public String saveImage(String imagebyteString) {
String encodingPrefix = "base64,";
int contentStartIndex = imagebyteString.indexOf(encodingPrefix)
+ encodingPrefix.length();
byte[] decodedBytes = DatatypeConverter
.parseBase64Binary(imagebyteString.substring(contentStartIndex));
try {
BufferedImage bfi = ImageIO.read(new ByteArrayInputStream(
decodedBytes));
String nameString = UUID.randomUUID().toString() + ".png";
File outputfile = new File(nameString);
this.userPhotoUrl = outputfile.getCanonicalPath();
ImageIO.write(bfi, "png", outputfile);
bfi.flush();
} catch (IOException e) {
e.printStackTrace();
return "false";
}
return "success";
}
原文：http://www.cnblogs.com/j3eee/p/3815954.html