HTML5断点续上传的示例代码分享

来源：动视网责编：小采时间：2020-11-27 15:10:20

HTML5断点续上传的示例代码分享

HTML5断点续上传的示例代码分享:断点http://www.gxlcms.com/php/php-tp-uploads.html target=_blank

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导读HTML5断点续上传的示例代码分享:断点http://www.gxlcms.com/php/php-tp-uploads.html target=_blank

断点http://www.gxlcms.com/php/php-tp-uploads.html" target="_blank">上传，java里面比较靠谱一点的，一般都会选用Flex。我承认，Flex只是摸了一下，不精通。HTML 5 有个Blob对象（File对象继承它），这个对象有个方法slice方法，可以对一个文件进行分片。，再加上HTML 5的File API和WebStorage。做了一个段断点续传的demo。

代码比较挫，把一个文件分成一个个小片之后，每一次上传都会将已经上传的字节数放到LocalStorage里面。关于LocalStorage里面缓存怎么清，可以参看Chrome - HTML 5 本地存储。如果上传的途中暂停或者直接关掉浏览器。下次上传的时候，就会从那个节点开始上传。

PS：demo操作，请先建立WS连接之后，再选择文件上传

代码请笑纳：

<!DOCTYPE html>
<html>
<head>
 <title>使用WebSocket实现断点续传文件</title>
 <meta charset="utf-8">
</head>
<script type="text/javascript" src="demo.js"></script>
 
<body onload="init();">
<button onclick="webSocketConn();">创建连接</button>(step1)
<div class="row">
 <label for="fileToUpload">Select a File to Upload</label>
 <input type="file" name="fileToUpload" id="fileToUpload" onchange="fileSelected();"/>(step2)
</div>
<div id="fileName"></div>
<div id="fileSize"></div>
<div id="fileType"></div>
<div class="row">
 <button onclick="sendFileName();uploadFile()">上传</button>(step3)
 <button onclick="pauseUpload()">暂停</button>
  <label id="progressNumber"></label>
</div>
<div id="msg" style="max-height: 400px; overflow:auto;min-height: 100px;">
</div>
</body>
</html>

####### 断点续传 ######
author：linrb
createTime: 2012-08-22
QQ: 569830404
*/
var websocket = null; //websocket
var msg = null; //日志
var paragraph = 10240; //每次分片传输文件的大小 10KB
var blob = null;// 分片数据的载体Blob对象
var file = null; //传输的文件
var startSize,endSize = 0; //分片的始终字节点
var uploadState = 0; // 0: 无上传/取消， 1： 上传中， 2： 暂停
 
//初始化消息框
function init(){
 msg = document.getElementById("msg");
}
/**
 * 分片上传文件
 */
function uploadFile() {
 if(file){
 //将上传状态设置成1
 uploadState = 1;
 endSize = getLastestUploadEndSize(file);
 var reader = new FileReader();
 reader.onload = function loaded(evt) {
 var ArrayBuffer = evt.target.result;
 websocket.send(ArrayBuffer);
 uploadProgress(endSize);
 };
 if(endSize < file.size){
 //先发送文件名称
 //websocket.send(file.name);
 //处理文件发送（字节）
 startSize = endSize;
 if(paragraph > (file.size - endSize)){
 endSize = file.size;
 }else{
 endSize += paragraph ;
 }
 if (file.webkitSlice) {
 //webkit浏览器
 blob = file.webkitSlice(startSize, endSize);
 }else
 blob = file.slice(startSize, endSize);
 reader.readAsArrayBuffer(blob);
 }
 }
}
 
//显示处理进程
function uploadProgress(uploadLen) {
 var percentComplete = Math.round(uploadLen * 100 / file.size);
 document.getElementById('progressNumber').innerHTML = percentComplete.toString() + '%';
 
 //保存到LocalStorage一边下次传输，可以记忆起这个断点
 localStorage.setItem(file.lastModifiedDate + "_" + file.name, uploadLen);
 
}
 
//WebSocket连接
function webSocketConn(){
 try{
 var readyState = new Array("正在连接", "已建立连接", "正在关闭连接"
 , "已关闭连接");
 var host = "ws://localhost:8000";
 websocket = new WebSocket(host);
 websocket.onopen = function(){
 msg.innerHTML += "<p>Socket状态： " + readyState[websocket.readyState] + "</p>";
 };
 websocket.onmessage = function(event){
 //每上传一个分片之后，等待介绍了服务端的提示之后再做下一个分片上传
 if(event.data.indexOf("ok") != -1 && uploadState == 1){
 if(endSize == file.size){
 localStorage.removeItem(file.lastModifiedDate + "_" + file.name);
 msg.innerHTML += "<p>上传完成!!</p>";
 websocket.close();//结束上传
 }else{
 uploadFile();
 }
 }
 };
 websocket.onclose = function(){
 msg.innerHTML += "<p>Socket状态： " + readyState[websocket.readyState] + "</p>";
 };
 msg.innerHTML += "<p>Socket状态： " + readyState[websocket.readyState] + "</p>";
 }catch(exception){
 msg.innerHTML += "<p>有错误发生</p>";
 return;
 }
}
 
/*
暂停上传
*/
function pauseUpload(){
 uploadState = 2;
}
 
/**
 * 从localStorage检查最后一次上传的字节
 */
function getLastestUploadEndSize(uploadFile){
 var lastestLen = localStorage.getItem(uploadFile.lastModifiedDate + "_" + uploadFile.name);
 if(lastestLen){
 return parseInt(lastestLen);
 }else{
 return 0;
 }
}
 
 
/*
 发送文件名
*/
function sendFileName(){
 websocket.send(file.name);
}
/**
 * 选择文件之后触发事件
 */
function fileSelected() {
 file = document.getElementById('fileToUpload').files[0];
 if (file) {
 var fileSize = 0;
 if (file.size > 1024 * 1024)
 fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB';
 else
 fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB';
 
 document.getElementById('fileName').innerHTML = 'Name: ' + file.name;
 document.getElementById('fileSize').innerHTML = 'Size: ' + fileSize;
 document.getElementById('fileType').innerHTML = 'Type: ' + file.type;
 }
}

服务端：

package fileUpload;
 
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.security.MessageDigest;
 
 
 
public class UploadServer {
 private int port = 8000;
 private ServerSocket serverSocket;
 
 public UploadServer() throws IOException {
 serverSocket = new ServerSocket(port);
 System.out.println("服务器启动");
 }
 
 private void service() {
 Socket socket = null;
 while (true) {
 try {
 socket = serverSocket.accept();
 Thread workThread = new Thread(new Handler(socket));
 workThread.start();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 }
 
 class Handler implements Runnable {
 private Socket socket;
 private boolean hasHandshake = false;
 Charset charset = Charset.forName("UTF-8"); 
 private File file = null;
 private FileOutputStream fileOut = null;
 
 public Handler(Socket socket) {
 this.socket = socket;
 }
 
 private PrintWriter getWriter(Socket socket) throws IOException {
 OutputStream socketOut = socket.getOutputStream();
 return new PrintWriter(socketOut, true);
 }
 
 
 public String echo(String msg) {
 return "echo:" + msg;
 }
 
 public void run() {
 
 try {
 System.out.println("New connection accepted"
 + socket.getInetAddress() + ":" + socket.getPort());
 InputStream in = socket.getInputStream();
 
 PrintWriter pw = getWriter(socket);
 //读入缓存
 byte[] buf = new byte[1024];
 //读到字节
 int len = in.read(buf, 0, 1024);
 //读到字节数组
 byte[] res = new byte[len];
 System.arraycopy(buf, 0, res, 0, len);
 String key = new String(res);
 if(!hasHandshake && key.indexOf("Key") > 0){
 key = key.substring(0, key.indexOf("==") + 2);
 key = key.substring(key.indexOf("Key") + 4, key.length()).trim();
 key+= "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 MessageDigest md = MessageDigest.getInstance("SHA-1"); 
 md.update(key.getBytes("utf-8"), 0, key.length());
 byte[] sha1Hash = md.digest(); 
 sun.misc.BASEEncoder encoder = new sun.misc.BASEEncoder(); 
 key = encoder.encode(sha1Hash); 
 pw.println("HTTP/1.1 101 Switching Protocols");
 pw.println("Upgrade: websocket");
 pw.println("Connection: Upgrade");
 pw.println("Sec-WebSocket-Accept: " + key);
 pw.println();
 pw.flush();
 hasHandshake = true;
 
 //接收数据
 byte[] first = new byte[1];
 int read = in.read(first, 0, 1);
 while(read > 0){
 int b = first[0] & 0xFF;
 //boolean fin = (b & 0x80) > 0;
 // int rsv = (b & 0x70) >>> 4;
 byte opCode = (byte) (b & 0x0F);
 
 if(opCode == 8){
 socket.getOutputStream().close();
 file = null;
 fileOut.flush();
 fileOut.close();
 fileOut = null;
 break;
 }
 b = in.read();
 int payloadLength = b & 0x7F;
 if (payloadLength == 126) {
 byte[] extended = new byte[2];
 in.read(extended, 0, 2);
 int shift = 0;
 payloadLength = 0;
 for (int i = extended.length - 1; i >= 0; i--) {
 payloadLength = payloadLength + ((extended[i] & 0xFF) << shift);
 shift += 8;
 }
 
 } else if (payloadLength == 127) {
 byte[] extended = new byte[8];
 in.read(extended, 0, 8);
 int shift = 0;
 payloadLength = 0;
 for (int i = extended.length - 1; i >= 0; i--) {
 payloadLength = payloadLength + ((extended[i] & 0xFF) << shift);
 shift += 8;
 }
 }
 
 //掩码
 byte[] mask = new byte[4];
 in.read(mask, 0, 4);
 int readThisFragment = 1;
 ByteBuffer byteBuf = ByteBuffer.allocate(payloadLength);
 while(payloadLength > 0){
 int masked = in.read();
 masked = masked ^ (mask[(int) ((readThisFragment - 1) % 4)] & 0xFF);
 byteBuf.put((byte) masked);
 payloadLength--;
 readThisFragment++;
 }
 byteBuf.flip();
 if(opCode == 1){
 getChar(byteBuf.array());
 }else
 outFile(byteBuf.array());
 in.read(first, 0, 1);
 }
 
 }
 in.close();
 } catch (Exception e) {
 e.printStackTrace();
 } finally {
 try {
 if (socket != null)
 socket.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 }
 
 private void responseClient(boolean finalFragment) throws IOException {
 ByteBuffer byteBuf = ByteBuffer.allocate(10);
 byteBuf.put("ok".getBytes("UTF-8"));
 OutputStream out = socket.getOutputStream();
 int first = 0x00;
 //是否是

输出最后的WebSocket响应片段，默认 if (finalFragment) { first = first + 0x80; first = first + 0x1; } out.write(first); if (byteBuf.limit() < 126) { out.write(byteBuf.limit()); } else if (byteBuf.limit() < 65536) { out.write(126); out.write(byteBuf.limit() >>> 8); out.write(byteBuf.limit() & 0xFF); } else { // Will never be more than 2^31-1 out.write(127); out.write(0); out.write(0); out.write(0); out.write(0); out.write(byteBuf.limit() >>> 24); out.write(byteBuf.limit() >>> 16); out.write(byteBuf.limit() >>> 8); out.write(byteBuf.limit() & 0xFF); } // Write the content out.write(byteBuf.array(), 0, byteBuf.limit()); out.flush(); } /** * 方法说明: * @开发：linrb * @创建时间：2012-8-21 * @param array * @throws IOException */ private void getChar(byte[] array) throws IOException { ByteArrayInputStream byteIn = new ByteArrayInputStream(array); InputStreamReader reader = new InputStreamReader(byteIn, charset.newDecoder()); int b = 0; String res = ""; try { while((b = reader.read()) > 0){ res += (char)b; } } catch (IOException e) { e.printStackTrace(); } file = new File("C:/" + res); } /** * 方法说明: * @开发：linrb * @创建时间：2012-8-14 * @param array * @throws IOException */ private void outFile(byte[] array) throws IOException { if(fileOut == null){ fileOut = new FileOutputStream(file, true); } fileOut.write(array); responseClient(true); } } public static void main(String[] args) throws IOException { new UploadServer().service(); } }

HTML5断点续上传的示例代码分享

HTML5断点续上传的示例代码分享:断点http://www.gxlcms.com/php/php-tp-uploads.html target=_blank

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