以下客户端服务器程序没有给我任何输出。我想添加两个数字。我是新的Java编程。输入第二个号码后,下面有空白区域。我在下面做了什么错。请帮我解决这个问题。感谢。
Client.Java
package Client.java;
import java.net.*;
import java.io.*;
import java.util.Scanner;
public class GreetingClient
{
public static void main(String [] args)
{
Scanner userInput = new Scanner(System.in);
System.out.println("Enter Server Address: ");
String serverName;
serverName = userInput.next();
System.out.println("Enter Port Number: ");
String port;
port = userInput.next();
try
{
System.out.println("Connecting to " + serverName
+ " on port " + port);
Socket client = new Socket(serverName, Integer.parseInt(port));
System.out.println("Just connected to "
+ client.getRemoteSocketAddress());
OutputStream outToServer = client.getOutputStream();
DataOutputStream out =
new DataOutputStream(outToServer);
System.out.println("Enter a first number: ");
//userInput.nextInt();
Integer x= userInput.nextInt();
System.out.println("Enter a second number: ");
// userInput.nextInt();
Integer y= userInput.nextInt();
// System.out.println("hello");
out.writeInt(x);
out.writeInt(y);
InputStream inFromServer = client.getInputStream();
DataInputStream in =
new DataInputStream(inFromServer);
System.out.println("Server responds: " +in.readInt());
client.close();
}catch(IOException e)
{
e.printStackTrace();
}
} }
Server.Java
` package Client.java;
import java.net.*;
import java.io.*;
import java.util.Scanner;
public class GreetingServer extends Thread
{
private ServerSocket serverSocket;
public GreetingServer(int port) throws IOException
{
serverSocket = new ServerSocket(port);
serverSocket.setSoTimeout(100000);
}
public void run()
{
while(true)
{
try
{
System.out.println("Waiting for client on port " +
serverSocket.getLocalPort() + "...");
Socket server = serverSocket.accept();
System.out.println("Just connected to "
+ server.getRemoteSocketAddress());
DataInputStream in =
new DataInputStream(server.getInputStream());
Integer x=in.readInt();
System.out.println("Hellox");
Integer y=in.readInt();
System.out.println("Helloy");
// System.out.println(x);
//System.out.println(y);
Integer sum = ( x + y );
DataOutputStream out =
new DataOutputStream(server.getOutputStream());
// System.out.println(sum);
out.write(sum);
server.close();
}catch(SocketTimeoutException s)
{
System.out.println("Socket timed out!");
break;
}catch(IOException e)
{
e.printStackTrace();
break;
}
}
}
public static void main(String [] args)
{
Scanner userInput = new Scanner(System.in);
System.out.println("Please specify a port number (1~65535): ");
String port;
port = userInput.next();
try
{
Thread t = new GreetingServer(Integer.parseInt(port));
t.start();
}catch(IOException e)
{
e.printStackTrace();
}
}
}`
答案 0 :(得分:0)
在您的服务器程序中,替换
out.write(sum);
与
out.writeInt(sum);
如果您发现,您在客户端程序中正确使用out.writeInt
。
答案 1 :(得分:0)
我的解决方案,来自巴西:
public class SocketSomaClient {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
int porta = 5050;
String ip = "localhost";
Scanner userInput = new Scanner(System.in);
try{
Socket socket = new Socket(ip, porta);
DataOutputStream output = new DataOutputStream(socket.getOutputStream());
System.out.println("Entre com o primeiro número: ");
int x= userInput.nextInt();
System.out.println("Entre com o segundo número: ");
int y= userInput.nextInt();
output.writeInt(x);
output.writeInt(y);
DataInputStream input = new DataInputStream(socket.getInputStream());
int soma = input.readInt();
System.out.println("A soma dos dois números é: "+ soma);
}catch(IOException ex){
System.err.println(ex.getMessage());
}
}
}
public class SocketSomaServer {
public static void main(String[] args) {
try{
ServerSocket serverSocket = new ServerSocket(5050);
while(true){
// aguarda conexões
Socket socket = serverSocket.accept();
try{
// recupera os dados
DataInputStream input =
new DataInputStream(socket.getInputStream());
Integer x = input.readInt();
Integer y = input.readInt();
Integer sum = ( x + y );
DataOutputStream out =
new DataOutputStream(socket.getOutputStream());
out.writeInt(sum);
}catch(SocketTimeoutException s)
{
System.out.println("Socket timed out!");
break;
}catch(IOException e)
{
e.printStackTrace();
break;
}
}
}catch(Exception ex){
System.err.println(ex.getMessage());
}
}
}
答案 2 :(得分:0)
这取决于服务器将什么内容写入输出流。在编写时不提供数据类型。您需要以类似的方式进行检索。
Integer sum = ( x + y );
DataOutputStream out =
new DataOutputStream(server.getOutputStream());
// System.out.println(sum);
out.write(sum);
在客户端中阅读时,只需使用以下阅读。
InputStream inFromServer = client.getInputStream();
DataInputStream in =
new DataInputStream(inFromServer);
System.out.println("Server responds: " +in.read());
请勿如上所示指定int类型。
请在下面找到完整的代码。
客户代码
package Client.java;
import java.net.*;
import java.io.*;
import java.util.Scanner;
public class GreetingClient {
public static void main(String[] args) {
Scanner userInput = new Scanner(System.in);
System.out.println("Enter Server Address: ");
String serverName;
serverName = userInput.next();
System.out.println("Enter Port Number: ");
String port;
port = userInput.next();
try {
System.out.println("Connecting to " + serverName + " on port " + port);
Socket client = new Socket(serverName, Integer.parseInt(port));
System.out.println("Just connected to " + client.getRemoteSocketAddress());
OutputStream outToServer = client.getOutputStream();
DataOutputStream out = new DataOutputStream(outToServer);
System.out.println("Enter a first number: ");
//userInput.nextInt();
Integer x = userInput.nextInt();
System.out.println("Enter a second number: ");
// userInput.nextInt();
Integer y = userInput.nextInt();
// System.out.println("hello");
out.writeInt(x);
out.writeInt(y);
DataOutputStream os = new DataOutputStream(client.getOutputStream());
BufferedReader is = new BufferedReader(new InputStreamReader(client.getInputStream()));
InputStream inFromServer = client.getInputStream();
DataInputStream in = new DataInputStream(inFromServer);
System.out.println("Server responds: " + in.read());
client.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
服务器代码
package Client.java;
import java.net.*;
import java.io.*;
import java.util.Scanner;
public class GreetingServer extends Thread {
private ServerSocket serverSocket;
public GreetingServer(int port) throws IOException {
serverSocket = new ServerSocket(port);
serverSocket.setSoTimeout(100000);
}
public void run() {
while (true) {
try {
System.out.println("Waiting for client on port " + serverSocket.getLocalPort() + "...");
Socket server = serverSocket.accept();
System.out.println("Just connected to " + server.getRemoteSocketAddress());
DataInputStream in = new DataInputStream(server.getInputStream());
Integer x = in.readInt();
System.out.println("Hellox");
Integer y = in.readInt();
System.out.println("Helloy");
// System.out.println(x);
// System.out.println(y);
Integer sum = (x + y);
DataOutputStream out = new DataOutputStream(server.getOutputStream());
// System.out.println(sum);
out.write(sum);
server.close();
} catch (SocketTimeoutException s) {
System.out.println("Socket timed out!");
break;
} catch (IOException e) {
e.printStackTrace();
break;
}
}
}
public static void main(String[] args) {
Scanner userInput = new Scanner(System.in);
System.out.println("Please specify a port number (1~65535): ");
String port;
port = userInput.next();
try {
Thread t = new GreetingServer(Integer.parseInt(port));
t.start();
} catch (IOException e) {
e.printStackTrace();
}
}
}