BufferedReader在與TCP套接字一起使用時在字符串中提供更多的空字符

Question

我的TCP服務器就是這樣。

import java.net.*;
import java.io.*;
public class NetTCPServer {
public static void main(String[] args) throws Exception{

ServerSocket sock;
sock = new ServerSocket(1122);
if(sock == null)
    System.out.println("Server binding failed.");
System.out.println("Server is Ready ..");

do{
    System.out.println("Waiting for Next client.");
    Socket clientSocket = sock.accept();
    if(clientSocket!=null)
        System.out.println("Clinet accepted. "+sock.getInetAddress().getHostAddress());

    DataOutputStream out = new DataOutputStream(clientSocket.getOutputStream());
    //DataInputStream in = new DataInputStream(clientSocket.getInputStream());
    BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
    String name;
    String pass;
    String line;
    name = in.readLine();
    pass = in.readLine();
    for(int i=0;i<name.length();i++)
        System.out.print(name.charAt(i)+","); //see more null char are receiving here

        System.out.println("");
        System.out.println(name +"  "+ name.length()+"  \n" + pass+"  "+pass.length());
    }while(true);

}
}

以及各自的TCP Client如下。

import java.net.*;
import java.io.*;
public class NetTCPClient {

    public static void main(String[] args) throws Exception {
        InetAddress addr = InetAddress.getByName("localhost");

        Socket sock;
        sock = new Socket(addr,1122);
        if(sock == null)
            System.out.println("Server Connection failed.");
        System.out.println("Waiting for some data...");
        DataInputStream input = new DataInputStream(sock.getInputStream());
        DataOutputStream output = new DataOutputStream(sock.getOutputStream());
        String uname="ram";
        String pass="pass";
        output.writeChars(uname+"\n");// \n is appended just make to readline of server get line
        output.writeChars(pass+"\n");
        }

}

當我同時編譯兩個文件並啟動服務器並運行客戶端后，我得到以下輸出。

 Server is Ready .. Waiting for Next client. Clinet accepted. 0.0.0.0 ,r,,a,,m,, ram7 pass9 

每個字符接收后的空字符對我來說有點奇怪。 使我無法將字符串與服務器中存儲的內容進行比較。 這些空字符是什么，它們從何而來。

Answer 1

您寫入字符，但讀取字節 行 。 那行不通。 如果要編寫字符，則需要以完全相同的編碼讀取字符。 如果要寫入字節，則需要讀取字節。 精確地在字節級別指定協議，並在客戶端和服務器中均遵循規范。

有關更多信息，請參見此問題 。