smack发送和接收文件

		/** 
	     * 发送文件
	     * @param con 用户连接对象
	     * @param fullJID 用户jid  形式如：demo@serviceName/Spark 2.6.3 
	     * @param filePath 文件路径
	     */  
		public boolean sendFiles(XMPPConnection con,String fullJID,String filePath){
			File files=new File(filePath);
			FileTransferManager fileManager=new FileTransferManager(con);
			OutgoingFileTransfer sendfile=fileManager.createOutgoingFileTransfer(fullJID);
			try {
				sendfile.sendFile(files, "Sending file");
				return true;
			} catch (XMPPException e) {
				e.printStackTrace();
				return false;
			}
		}
		
		/** 
	     * 接收文件
	     * @param con 用户连接对象
	     * @param filePath 文件路径
	     */
		public void receiveFiles(XMPPConnection con,final String filePath){
			FileTransferManager fileManager=new FileTransferManager(con);
			fileManager.addFileTransferListener(new FileTransferListener() {
				@Override
				public void fileTransferRequest(FileTransferRequest prequest) {
					//System.out.println("The file received from: " + prequest.getRequestor());
					System.out.println("filePath:"+filePath+"||FileName:"+prequest.getFileName());
					file = new File(filePath +"\\" +prequest.getFileName());
					request = prequest;
					IncomingFileTransfer infiletransfer =request.accept();
					try {
						infiletransfer.recieveFile(file);
						System.out.println("接收成功！");
					} catch (XMPPException e) {
						e.printStackTrace();
					}
				}
			});
		}