BufferedReader接受终端输入字符
BufferedReader接受终端输入字符
提问于 2018-09-13 03:53:43
我正在用Java语言实现套接字编程，在那里我使用BufferedReader从客户端获取输入。但是，BufferedReader对象接受在控制台上输入的换行符。下面是我的服务器端代码：
import java.net.*;
import java.io.*;
class FTPserver {
private ServerSocket serverSocket = null;
private DataInputStream dis = null;
private DataOutputStream dos = null;
FTPserver() {
try {
String input;
serverSocket = new ServerSocket(3000);
Socket socket = null;
socket = serverSocket.accept();
dis = new DataInputStream(socket.getInputStream());
dos = new DataOutputStream(socket.getOutputStream());
input = dis.readUTF();
if(input.equals("ftp")) {
dos.writeUTF("ftp> ");
input = dis.readUTF();
System.out.print("opened connection to 10.10.10.212");
dos.writeUTF("Connected to 10.10.10.212\n220 (vsFTPd 3.0.2)\nName (10.10.10.212:root): ");
input = dis.readUTF();
dos.writeUTF("331 Please specify the password.\nPassword: ");
input = dis.readUTF();
dos.writeUTF("230 Login successful.\nRemote system type is UNIX\nUse binary mode to transfer files\nftp> ");
input = dis.readUTF(); //receive mget
dos.writeUTF("ftp> ");
input = dis.readUTF(); //receive mput
dos.writeUTF("ftp> ");
//input = dis.readUTF();
input = dis.readUTF(); //receive exit
dos.writeUTF("Goodbye");
input = dis.readUTF(); //receive exit
dos.writeUTF("Goodbye");
}
dis.close();
dos.close();
socket.close();
}
catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
FTPserver ftp = new FTPserver();
}
}下面是我的客户端代码：
import java.net.*;
import java.io.*;
import java.util.Scanner;
class FTPclient {
private DataInputStream dis = null;
private DataOutputStream dos = null;
private Socket socket = null;
FTPclient() {
try {
String input,output;
BufferedReader sc = new BufferedReader(new InputStreamReader(System.in));
socket = new Socket("localhost",3000);
dis = new DataInputStream(socket.getInputStream());
dos = new DataOutputStream(socket.getOutputStream());
output = sc.readLine();
dos.writeUTF(output); // write ftp
System.out.print(dis.readUTF()); // print ftp>
dos.writeUTF(sc.readLine()); // write open 10.10.10.212
System.out.print(dis.readUTF()); // print connected
dos.writeUTF(sc.readLine());
System.out.print(dis.readUTF());
dos.writeUTF(sc.readLine()); //send mget
System.out.print(dis.readUTF());
dos.writeUTF(sc.readLine()); //send mput
System.out.print(dis.readUTF());
dos.writeUTF(sc.readLine()); //send exit
System.out.println(dis.readUTF());
dos.writeUTF(sc.readLine()); //send exit
System.out.println(dis.readUTF());
dis.close();
dos.close();
socket.close();
}
catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
FTPclient ftp = new FTPclient();
}
}以下是我在客户端控制台上提供的输入：
dell@dell-Inspiron-15-3567:~$ java FTPclient
ftp
ftp> open 10.10.10.212
Connected to 10.10.10.212
220 (vsFTPd 3.0.2)
Name (10.10.10.212:root): student
331 Please specify the password.
Password: student
230 Login successful.
Remote system type is UNIX
Use binary mode to transfer files
ftp> mget *.py
ftp> mput sample.java
ftp> //this line is getting skipped
exit
Goodbye
dell@dell-Inspiron-15-3567:~$正如在上面的控制台片段中提到的，用户将输入exit的行将被跳过。根据stackoverflow的回答，我的输入应该以一个终止字符结束。我不知道该怎么做。
回答 1
Stack Overflow用户
回答已采纳
发布于 2018-09-13 04:37:11
我假设您所说的“跳过”是指单词“exit”打印在下面的行中，而不是像前面的行中那样直接在"ftp>“之后打印。如果是这样，我认为发生这种情况的原因是因为您在客户端的这些行中使用的是System.out.println，而不是前面的行中的System.out.print。我认为您的输入正在正确终止，因为您的程序似乎正在正确地结束，而不是继续等待进一步的输入。
dos.writeUTF(sc.readLine()); //send exit
System.out.println(dis.readUTF());
dos.writeUTF(sc.readLine()); //send exit
System.out.println(dis.readUTF());页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/52302486
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