[英]Java, problems with BufferedReader in a while loop
我一直在努力前進。 從套接字接收線路時,此while循環似乎掛起。
這是代碼的服務器端:
out = new PrintWriter(socketcliente.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(socketcliente.getInputStream()));
//receive and shows client data
linea = 0;
while ((buffer[linea] = in.readLine()) != null) {
System.out.println(buffer[linea]);
linea = linea+1;
}
//asks for a command and sends it to client
System.out.println("Enter remote command");
while ((input = scanner.nextLine()) != null) {
out.println(input);
}
這是客戶端:
out = new PrintWriter(socketcliente.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(socketcliente.getInputStream()));
//sends a limited amount of lines to the server
linea = 0;
while (buffer[linea] != null) {
out.println(buffer[linea]);
linea = linea+1;
}
//receive the command from server, executes and save output for sending to the server
while ((comandor = in.readLine()) != null) {
proceso = Runtime.getRuntime().exec(comandor);
pinput = new BufferedReader(new InputStreamReader(proceso.getInputStream()));
buffer = new String[100];
linea = 0;
while ((psalida = pinput.readLine()) != null) {
buffer[linea] = psalida;
linea = linea+1;
}
}
服務器打印收到的數據后,將不執行任何操作,也不會退出while循環。 必須將數據發送回客戶端。 我正在使用PrintWriter和BufferedReader。
編輯:更完整的代碼,以了解我在嘗試什么。 命令執行和輸出的保存運行良好,問題在於在服務器中接收數據,它獲取了所有數據,但在最后停止並且不退出第一個while循環。 如何允許它退出循環? 我嘗試在消息后從客戶端發送空字節,或服務器可以理解的“退出文本”,例如:
while ((buffer[linea] = in.readLine()) != null && (buffer[linea] = in.readLine()) != "quit")
我迷路了,沒找到怎么做。
所有這些都在try語句中。 沒用。 我是一個初學者,感謝您的幫助。
在server side
代碼中,您為line
編寫的遞增行是錯誤的,必須將其更正為line = line+1;
因此,整個服務器端代碼必須如下所示
line = 0;
while ((buffer[line] = in.readLine()) != null) {
System.out.println(buffer[line]);
line++;
}
而是將字符串讀取到StringBuilder-更少的分配,更快,更容易:
StringBuilder builder = new StringBuilder();
String aux = "";
BufferedReader pinput = new BufferedReader(new InputStreamReader(process.getInputStream()));
while ((aux = pinput.readLine()) != null) {
builder.append(aux);
}
String text = builder.toString();
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