reader.onloadstart = function() {
// 这个事件在读取开始时触发
console.log("onloadstart");
document.getElementById("bytesTotal").textContent = file.size;
}
reader.onprogress = function(p) {
// 这个事件在读取进行中定时触发
console.log("onprogress");
document.getElementById("bytesRead").textContent = p.loaded;
}

reader.onload = function() {
// 这个事件在读取成功结束后触发
console.log("load complete");
}

reader.onloadend = function() {
// 这个事件在读取结束后，无论成功或者失败都会触发
if (reader.error) {
console.log(reader.error);
} else {
document.getElementById("bytesRead").textContent = file.size;
// 构造 XMLHttpRequest 对象，发送文件 Binary 数据
var xhr = new XMLHttpRequest();
xhr.open(/ method / "POST",/ target url / "upload.jsp?fileName=" + file.name
/,async,default to true /);
xhr.overrideMimeType("application/octet-stream");
xhr.sendAsBinary(reader.result);
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
if (xhr.status == 200) {
console.log("upload complete");
console.log("response: " + xhr.responseText);
}
}
}
}
}

reader.readAsBinaryString(file);
} else {
alert ("Please choose a file.");
}
}

byte[] buf = new byte[1024];
//接收文件上传并保存到 d:\
File file = new File("d:/" + fn);

BufferedOutputStream fileOut = new BufferedOutputStream(new
FileOutputStream(file));

while (true) {
// 读取数据
int bytesIn = fileIn.read(buf,1024);

System.out.println(bytesIn);

if (bytesIn == -1)
{
break;
}
else
{
fileOut.write(buf,bytesIn);
}
}

fileOut.flush();
fileOut.close();

out.print(file.getAbsolutePath());
%>