我正在尝试编写Android客户端和Java服务器。
它可以从Android客户端向服务器发送消息（如果测试代码被注释掉），但我无法将响应从服务器返回给客户端。
你能帮我吗？
这是客户：
public class MainActivity extends ActionBarActivity {
private Socket client;
private PrintWriter printwriter;
private String messsage;
Button register , login;
EditText et_login_uid , et_login_pwd;
TextView backMessage;
private String serverResponse;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
register = (Button) findViewById(R.id.btn_register);
login = (Button) findViewById(R.id.btn_login);
et_login_uid = (EditText) findViewById(R.id.et_login_uid);
et_login_pwd = (EditText) findViewById(R.id.et_login_pwd);
backMessage = (TextView) findViewById(R.id.tv_hello);
register.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent yeni = new Intent(MainActivity.this,Register.class);
startActivity(yeni);
}
});
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
messsage = et_login_uid.getText().toString() + ";" + et_login_pwd.getText().toString();
SendMessage sendMessageTask = new SendMessage();
sendMessageTask.execute();
}
});
/*login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent yeni = new Intent(MainActivity.this,Login.class);
startActivity(yeni);
}
});*/
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private class SendMessage extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params) {
try {
client = new Socket("192.168.0.150", 4444); // connect to the server
printwriter = new PrintWriter(client.getOutputStream(), true);
printwriter.write(messsage); // write the message to output stream
printwriter.flush();
Log.i("patmaadı", "patmaladı");
BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
while (true) {
Log.i("patladı", "patladi2");
if ((serverResponse = in.readLine()) != null) {
Log.i("server says", serverResponse);
backMessage.setText(serverResponse);
break;
}
}
printwriter.close();
client.close(); // closing the connection
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
}
这是服务器
public class Main {
private static ServerSocket serverSocket;
private static Socket clientSocket;
private static InputStreamReader inputStreamReader;
private static BufferedReader bufferedReader;
private static String message;
static String DID, UID, PWD, PWDR;
private Socket client;
private PrintWriter printwriter;
private String messsage = "i'm back";
public static void main(String[] args) {
try {
serverSocket = new ServerSocket(4444); // Server socket
} catch (IOException e) {
System.out.println("Could not listen on port: 4444");
}
System.out.println("Server started. Listening to the port 4444");
while (true) {
try {
clientSocket = serverSocket.accept(); // accept the client
// connection
inputStreamReader = new InputStreamReader(
clientSocket.getInputStream());
bufferedReader = new BufferedReader(inputStreamReader); // get
// the
// client
// message
message = bufferedReader.readLine();
String[] tokens = message.split(";");
if (tokens.length == 4) {
register(tokens);
} else if (tokens.length == 2) {
login(tokens);
}
PrintWriter out = new PrintWriter(
clientSocket.getOutputStream(), true);
out.write("i'm back");
inputStreamReader.close();
clientSocket.close();
} catch (IOException ex) {
System.out.println("Problem in message reading");
}
}
}
static void login(String tokens[]) {
for (String t : tokens) {
UID = tokens[0];
PWD = tokens[1];
System.out.println(UID + PWD);
}
}
static void register(String tokens[]) {
for (String t : tokens) {
DID = tokens[0];
UID = tokens[1];
PWD = tokens[2];
PWDR = tokens[3];
}
System.out.println(DID + " " + UID + " " + PWD + " " + PWDR);
database();
}
static void database() {
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection conn = null;
conn = DriverManager.getConnection("jdbc:mysql://localhost/cankat",
"root", "");
System.out.print("Database is connected !");
Statement stt = conn.createStatement();
if (PWD.equals(PWDR)) {
stt.executeUpdate("INSERT INTO users " + "VALUES ('" + DID
+ "','" + UID + "','" + PWD + "')");
} else {
}
conn.close();
} catch (Exception e) {
System.out.print("Do not connect to DB - Error:" + e);
}
}
}