Question

我被迫试图前进。当从套接字接收线路时，这个while循环似乎挂起。

这是代码的服务器端：

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);
            }

这是客户端：

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;
            }
        }

服务器打印收到的数据后，它什么都不做，也不退出while循环。必须将数据发送回客户端。我正在使用PrintWriter和BufferedReader。

编辑：更完整的代码，以了解我正在尝试。命令执行和输出的保存运行正常，问题是在服务器中接收数据，它获取所有数据，但在结束时停止并且不退出第一个while循环。如何让它退出循环？我尝试在消息之后从客户端发送空字节，或者服务器可以理解的“退出文本”：

while ((buffer[linea] = in.readLine()) != null && (buffer[linea] = in.readLine()) != "quit")

我迷路了，没找到怎么办。

所有这些都在try语句中。什么都行不通。我是初学者，谢谢你的帮助。

Answer 1

在server side代码中，您为line编写的递增行是错误的，必须更正为line = line+1;，因此整个`服务器端代码必须如下所示

line = 0;
while ((buffer[line] = in.readLine()) != null) {
    System.out.println(buffer[line]);
    line++;
}

Answer 2

将字符串读取到StringBuilder - 减少分配，更快更轻松：

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();

Java，while循环中BufferedReader的问题

2 个答案: