我创建了一个通过wifi连接到我的覆盆子pi的应用程序并启动了一个python脚本，但出于某种原因，当我尝试在文本视图中打印终端响应时，他们不断提出奇怪的字符而不是可读的ascii。 主动发送shell命令的函数是我的代码末尾的“PyPiCommands”。有人可以解释我缺少用明文ASCII字符打印终端响应的内容：
//The following method starts the initial ssh connection======================
public String executeRemoteCommand(String usrname, String passwd, String hostname, int Port) throws Exception {
responseArray.add("Attempting to Connect...");
Properties prop = new Properties();
prop.put("StrictHostKeyChecking", "no");
JSch jsch = new JSch();
final Session session = jsch.getSession(usrname, hostname, Port);
session.setPassword(passwd);
session.setConfig(prop);
session.connect();
if (session.isConnected()) {
piConnected = Boolean.TRUE;
} else {
responseArray.clear();
Log.i("ssh", "Connection Failed");
responseArray.add("Connection Failed.");
}
final ChannelExec channelssh = (ChannelExec) session.openChannel("exec");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
channelssh.setOutputStream(baos);
channelssh.setOutputStream(baos);
channelssh.setCommand(command);
InputStream in = channelssh.getInputStream();
channelssh.connect();
if (channelssh.isConnected()) {
System.out.println("channel connected");
if (!channelssh.isClosed()) {
System.out.println("channel not closed");
}
final BufferedReader bufferReader = new BufferedReader(new InputStreamReader(in));
String result = bufferReader.readLine();
for (int count = 0; count < result.length(); count++) {
System.out.println("outstring: " + result);
result = bufferReader.readLine();
this.responseArray.add(count, result);
if (result == null) {
break;
}
}
System.out.println("");
System.out.println("response array: " + responseArray.toString());
//channelssh.disconnect();
//session.disconnect();
final Channel channel = session.openChannel("shell");
final OutputStream inputStream = channel.getOutputStream();
final PrintStream commander = new PrintStream(inputStream, true);
channel.setOutputStream(System.out, true);
channel.connect();
final String finalResult = result;
final Runnable checkCommand = new Runnable() {
@Override
public void run() {
try {
PyPiCommands(channel, command, inputStream, commander);
} catch (IOException e) {
e.printStackTrace();
} catch (JSchException e) {
e.printStackTrace();
}
if (sessKill == Boolean.FALSE) {
handler1.postDelayed(this, 200);
}
}
};
handler1.postDelayed(checkCommand, 300);
}
return responseArray.toString();
}
以下方法是打开的shell会话，用于运行python脚本，该脚本请求用户输入执行不同的远程操作。在从应用程序发送的每个命令之后，我在终端中收到shell响应。
public void PyPiCommands(Channel channel, String command, OutputStream inputStream, PrintStream commander) throws IOException, JSchException {
if (newCmdRcv == Boolean.TRUE) {
System.out.println("running new handler");
newCmdRcv = Boolean.FALSE;
try {
if(channel.isConnected() == Boolean.TRUE){
Log.i("ssh", "channel connected");
}
else{
Log.i("ssh", "channel NOT connected");
}
if(channel.isClosed() == Boolean.TRUE){
Log.i("ssh", "channel IS closed");
}
else{
Log.i("ssh", "channel not closed");
}
commander.println(command);
System.out.println("printing rcv: " +commander.toString());
do {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
} while (channel.isEOF());
} catch (Exception e) {
e.printStackTrace();
}
}
}
当我在显示器中打印指令数据时，这就是我所看到的：
03-03 13:26:11.410 25133-25133/com.princton.litmo.prynsofpi I/System.out: printing rcv: java.io.PrintStream@d584d0a
但是我知道它正在收到，我只是不确定如何存储字符串并将其打印在应用程序上的textview而不是上面的文本中。
03-03 13:26:11.740 25133-26877/com.app I/System.out: 5
03-03 13:26:11.740 25133-26877/com.app I/System.out: 5
03-03 13:26:11.740 25133-26877/com.app I/System.out: running
03-03 13:26:11.740 25133-26877/com.app I/System.out: straight
03-03 13:26:11.910 25133-26877/com.app I/System.out: Gimme dat: