[英]Reading data from a socket java
因此,我正在嘗試從套接字讀取數據。 我已經建立了連接,並向正在偵聽此類消息的另一個套接字發送了一條消息,但似乎什么也沒收到。 客戶代碼:
import java.net.*;
import java.io.*;
import java.util.*;
public class TCPClient {
/*Conecting to server.
*/
public static void Client(String[] args){
int port = 47361;
Scanner in = new Scanner(System.in);
System.err.print("Starting up...");
Socket CS1 = null; //Declaring CS1 as a socket
DataOutputStream DOS1 = null; //Declaring an outputput data stream "DOS1"
DataInputStream DIS1 = null; //Setting the values to null
System.err.println("All created.");
System.out.println("---------");
System.out.println(" OPTIONS");
System.out.println("---------");
System.out.println("0. Connect.");
System.out.println("1. Change port.");
System.out.println("2. Cancel start-up.");
System.out.println("");
System.out.println("Choose an option.");
try {
short ans = in.nextShort();
if (ans == 2){
System.err.println("System.exit(0)");
System.exit(0);
}
if (ans == 1){
System.out.print("Enter the new port: ");
port = in.nextInt();
ans = 0;
}
if (ans == 0){
System.out.print("Enter the IP: ");
CS1 = new Socket(in.next(), port); //Creating an instane of the "CS1" socket
System.err.print("Request sent on port " + port + ".");
DOS1 = new DataOutputStream(CS1.getOutputStream());
DIS1 = new DataInputStream(CS1.getInputStream()); //creating output and input streams
System.err.println("Instances created!");
if (DIS1 != null){
System.err.println("DIS1 is connected!");
}
else {
System.err.println("DIS1 is null!");
}
if (DOS1 != null) {
System.err.println("DOS1 is connected!");
System.out.print("Enter input: ");
String FirstMessage = in.nextLine();
DOS1.writeBytes(FirstMessage);
String SecondMessage = DIS1.readLine();
System.out.println(SecondMessage);
if (SecondMessage.equals(FirstMessage)) {
}
else {
System.out.println("Please check the code, FirstMessage != SecondMessage");
}
}
else {
System.err.println("DOS1 is null!");
}
if (CS1 != null) {
System.err.println("CS1 is connected!");
}
else {
System.err.println("CS1 is null!");
}
DIS1.close();
DOS1.close();
CS1.close(); //closing everything
}
}
catch (IOException e){
System.err.println("IOException: " + e.getMessage());
}
}
}
服務器代碼:
import java.net.*;
import java.io.*;
import java.util.*;
public class TCPServer {
/*Connecting to client
*/
public static void Server (String[] args) {
System.err.print("Starting up...");
ServerSocket SS1 = null;
DataOutputStream DOS1 = null;
DataInputStream DIS1 = null;//Setting the values to null
System.err.println("All created.");
Scanner in = new Scanner(System.in);
try {
SS1 = new ServerSocket(47361); //setting the socket SS1 to port 5000 and creating an instance
System.err.print("Listening on port 47361...");
Socket CS1 = SS1.accept(); //accepting the connection request
DOS1 = new DataOutputStream(CS1.getOutputStream());
DIS1 = new DataInputStream(CS1.getInputStream());//creating output and input streams
System.err.println("Instances created!");
if (DIS1 != null){
System.err.println("DIS1 is connected!");
System.err.println(DIS1);
}
else {
System.err.println("DIS1 is null!");
}
if (DOS1 != null) {
System.err.println("DOS1 is connected!");
System.err.println(DOS1);
}
else {
System.err.println("DOS1 is null!");
}
if (SS1 != null) {
System.err.println("SS1 is connected!");
System.err.println(SS1);
}
else {
System.err.println("SS1 is null!");
}
String FirstMessage = null;
FirstMessage = DIS1.readLine();
System.out.println(FirstMessage);
String SecondMessage = FirstMessage;
DOS1.writeBytes(SecondMessage);
DIS1.close();
DOS1.close();
SS1.close(); //closing everything
}
catch (IOException error){
System.err.println("IOException " + error.getMessage());
}
catch (java.util.InputMismatchException error2){
System.err.println("IOException " + error2.getMessage());
}
}
}
到目前為止,它幾乎是一個EchoServer,沒有Buffered。 我看着調試器,它卡在FirstMessage = DIS1.readLine();
服務器中的行和String SecondMessage = DIS1.readLine();
在客戶端。 而且,即使輸入了所有可能的輸入,服務器和客戶端也都在等待輸入。 為什么會發生這種情況? 我該如何做呢?
旁注:我知道I / O流或套接字永遠不會等於null。 另外,編譯器警告我類java.io.DataInputStream已被棄用。 您建議使用哪些其他課程?
另一個注意事項:我是IO新手,請不要為此而殺我哈哈:)
謝謝!
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