Android实现简单的文件下载与上传

文件下载

/**
* 下载服务 IntentService
* 生命周期：
* 1>当第一次启动IntentService时，Android容器
* 将会创建IntentService对象。
* 2>IntentService将会在工作线程中轮循消息队列，
* 执行每个消息对象中的业务逻辑。
* 3>如果消息队列中依然有消息，则继续执行，
* 如果消息队列中的消息已经执行完毕，
* IntentService将会自动销毁，执行onDestroy方法。
*/
public class DownloadService extends IntentService{
private static final int NOTIFICATION_ID = 100;
public DownloadService(){
super("download");
}
public DownloadService(String name) {
super(name);
}
/**
* 该方法中的代码将会在工作线程中执行
* 每当调用startService启动IntentService后，
* IntentService将会把OnHandlerIntent中的
* 业务逻辑放入消息队列等待执行。
* 当工作线程轮循到该消息对象时，将会
* 执行该方法。
*/
protected void onHandleIntent(Intent intent) {
//发送Http请求执行下载业务
//1. 获取音乐的路径
String url=intent.getStringExtra("url");
String bit=intent.getStringExtra("bit");
String title=intent.getStringExtra("title");
//2. 构建File对象，用于保存音乐文件
// /mnt/sdcard/Music/_64/歌名.mp3
File targetFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC),"_"+bit+"/"+title+".mp3" );
if(targetFile.exists()){
Log.i("info", "音乐已存在");
return;
}
if(!targetFile.getParentFile().exists()){
targetFile.getParentFile().mkdirs();
}
try {
sendNotification("音乐开始下载", "音乐开始下载");
//3. 发送Http请求，获取InputStream
InputStream is = HttpUtils.getInputStream(url);
//4. 边读取边保存到File对象中
FileOutputStream fos = new FileOutputStream(targetFile);
byte[] buffer = new byte[1024*100];
int length=0;
int current = 0;
int total = Integer.parseInt(intent.getStringExtra("total"));
while((length=is.read(buffer)) != -1){
fos.write(buffer, 0, length);
fos.flush();
current += length;
//通知下载的进度
double progress = Math.floor(1000.0*current/total)/10;
sendNotification("音乐开始下载", "下载进度："+progress+"%");
}
//5. 文件下载完成
fos.close();
cancelNotification(); //重新出现滚动消息
sendNotification("音乐下载完成", "音乐下载完毕");
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 发通知
*/
public void sendNotification(String ticker, String text){
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
Notification.Builder builder = new Notification.Builder(this);
builder.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("音乐下载")
.setContentText(text)
.setTicker(ticker);
Notification n = builder.build();
manager.notify(NOTIFICATION_ID, n);
}
/**
* 取消通知
*/
public void cancelNotification(){
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
manager.cancel(NOTIFICATION_ID);
}
}

文件上传

/**
* 上传文件
* @param uploadFile
*/
private void uploadFile(final File uploadFile) {
new Thread(new Runnable() {
@Override
public void run() {
try {
uploadbar.setMax((int)uploadFile.length());
String souceid = logService.getBindId(uploadFile);
String head = "Content-Length="+ uploadFile.length() + ";filename="+ uploadFile.getName() + ";sourceid="+
(souceid==null? "" : souceid)+" ";
Socket socket = new Socket("192.168.1.78",7878);
OutputStream outStream = socket.getOutputStream();
outStream.write(head.getBytes());
PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream());
String response = StreamTool.readLine(inStream);
String[] items = response.split(";");
String responseid = items[0].substring(items[0].indexOf("=")+1);
String position = items[1].substring(items[1].indexOf("=")+1);
if(souceid==null){//代表原来没有上传过此文件，往数据库添加一条绑定记录
logService.save(responseid, uploadFile);
}
RandomAccessFile fileOutStream = new RandomAccessFile(uploadFile, "r");
fileOutStream.seek(Integer.valueOf(position));
byte[] buffer = new byte[1024];
int len = -1;
int length = Integer.valueOf(position);
while(start&&(len = fileOutStream.read(buffer)) != -1){
outStream.write(buffer, 0, len);
length += len;
Message msg = new Message();
msg.getData().putInt("size", length);
handler.sendMessage(msg);
}
fileOutStream.close();
outStream.close();
inStream.close();
socket.close();
if(length==uploadFile.length()) logService.delete(uploadFile);
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
}
}