基于smack的即时聊天系统之文件传输功能实现

功能实现流程为：

1.文件发送方用户登录

2.确定文件的接收方和待发送文件路径

3.获取连接

4.根据连接获取文件接收方的完整jid（例如[email protected]/MiniQQ 2.3.6），其中MiniQQ 2.3.6为文件接收方用户客户端的resource，必须获取到，否则文件无法发送

5.发送文件

实现代码为：

<span style="font-size:18px;">public int TransFile(String toUser, String fileDir) {
		// final int flag[] = new int[] { 0 };
		Connection conn = this.connection;

		ServiceDiscoveryManager serviceDiscoveryManager = new ServiceDiscoveryManager(
				conn);

		// System.out.println(conn.toString());
		// System.out.println(this.sessionManager.getConnection().toString());

		if (!toUser.contains("@")) {
			toUser = toUser + "@" + this.connection.getServiceName();
		}
		// toUser = toUser +"/Spark 2.6.3";
		Roster roster = connection.getRoster();
		Presence pre = roster.getPresence(toUser);
		toUser = pre.getFrom();
		if (!toUser.contains("/")) {
			//toUser = toUser + "/MiniQQ 2.3.6";
			toUser = toUser + "/MiniQQ 2.3.6";
		}
		System.out.println("向发送文件：" + toUser);
		// System.out.println(toUser);
		if (pre == null) {
			System.out.println("用户不存在");
			return -1;
		}

		FileTransferManager transferManager = new FileTransferManager(conn);

		final File file = new File(fileDir);
		final OutgoingFileTransfer transfer = transferManager
				.createOutgoingFileTransfer(toUser);

		// FutureTask<Integer> task = new FutureTask<Integer>();

		FutureTask<Integer> task = new FutureTask<>(new Callable<Integer>() {
			@Override
			public Integer call() throws Exception {
				int flag = 0;
				try {
					transfer.sendFile(file, "Sending");
					while (!transfer.isDone()) {
						try {
							Thread.sleep(10L);
						} catch (InterruptedException e) {
							e.printStackTrace();
						}

						if (transfer.getStatus() == FileTransfer.Status.in_progress) {
							System.out.println(transfer.getProgress());
							// flag[0] = 0;

						} else {
							if (transfer.getStatus() == FileTransfer.Status.error) {
								System.out.println("file transport failed");//
								// flag[0] = -1;
								flag = -1;
								// return ;
							}
							if (transfer.getStatus() == FileTransfer.Status.refused) {
								System.out
										.println("file transport was refused");
								// flag[0] = -1;
								flag = -1;
								// return ;
							}
						}
					}
				} catch (XMPPException e1) {
					e1.printStackTrace();
					// return ;
				}

				return flag;
			}
		});

		SwingUtilities.invokeLater(task);

		int flagRes = 0;
		while (true) {
			if (task.isDone()) {
				try {
					flagRes = task.get();
				} catch (InterruptedException e) {
					e.printStackTrace();
				} catch (ExecutionException e) {
					e.printStackTrace();
				}
				break;
			}
		}
		return flagRes;
	}</span>