请帮助，已建立与服务器的连接，但服务器不会响应任何请求。只是尝试通过发送服务器“1”来获取时间和日期。 P.s我知道我不应该拥有1-7的所有案例，但我只想在担心其他人之前得到日期广告时间
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
import java.util.Date;
import java.util.Scanner;
/**
*
* @author samdo
*/
public class SocketProgrammingSamD {
/**
* @param args the command line arguments
*/
private static Scanner in;
public static void main(String[] args) throws IOException {
System.out.println("Samuel Donini");
System.out.println(" ");
System.out.println("Project 1");
System.out.println(" ");
System.out.println(" ");
//new Driver().execute(args);//Creates an instance of the Driver class and Calls the Driver.execute method
in = new Scanner(System.in);
System.out.println("(Client) Enter Server Ip to Connect to(Empty will give localhost):");
String ip = in.nextLine();
System.out.println("(Client) Enter your server port no:");
int port = in.nextInt();
if (ip == null || ip.length() == 0) {
ip = "localhost";
}
System.out.println("Connecting to " + ip + ":" + port);
// for taking input from client
// InputStream inputStream = connectionSocket.getInputStream();
// Try to connect to port and the IP address given on the command line.
try (Socket socket = new Socket(ip, port)) {
// for taking input from client
// InputStream inputStream = connectionSocket.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(System.in);
BufferedReader inputFromClient = new BufferedReader(inputStreamReader);
// for giving output to the client.
OutputStream outputStream = socket.getOutputStream();
// output to client, to send data to the server
DataOutputStream dataOutputStream = new DataOutputStream(outputStream);
// get output from server
InputStream serverInputStream = socket.getInputStream();
InputStreamReader inputStreamReaderFromServer = new InputStreamReader(
serverInputStream);
BufferedReader bufferReader = new BufferedReader(
inputStreamReaderFromServer);
//System.out.println("(Client) Give input:");
System.out.printf("Menu Options:\t\t\tCommands\n");
System.out.printf("-------------\t\t\t--------\n");
System.out.printf(" * 1 current Date & Time:\t1\n");
System.out.printf(" * 2 uptime: \t\t 2\n");
System.out.printf(" * 3 memory use: \t\t3\n");
System.out.printf(" * 4 Netstat: \t\t 4\n");
System.out.printf(" * 5 current users: \t\t5\n");
System.out.printf(" * 6 disk usage: \t\t6\n");
System.out.printf(" * 7 Quit: \t\t\t7\n\n");
String readingLineFromUser = inputFromClient.readLine();
// sending data to server
dataOutputStream.writeBytes(readingLineFromUser + "\n");
String getStringFromServer = bufferReader.readLine();
System.out.println("Got input from server (in client):" + getStringFromServer);
//attempts to get System Time
System.out.println("Requesting system time");
System.out.println("1");
//System.out.write("Server Date" + (new Date()).toString() + "\n");
System.out.println("Response from the server:\n");
// Read lines from the server and print them until "ServerDone" on
// a line by itself is encountered.
String answer;
while ((answer = inputFromClient.readLine()) != null && !answer.equals("ServerDone")) {
System.out.println(answer);
}
return;
}
}
}
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.*;
public class Server {
private static ServerSocket severSocket;
private static Scanner in;
public static void main(String[] args) throws IOException {
in = new Scanner(System.in);
System.out.println("(Server) Enter your server port no:");
int port = in.nextInt();
System.out.println("Server Estabilsh Connection On Localhost or own ip with port : " + port);
severSocket = new ServerSocket(port);
System.out.println("Now you can run your client app.");
while (true) {
Socket connectionSocketListens = severSocket.accept();//Listens for a connection to be made to this socket and accepts it.
System.out.println("Accepted Client connection");
// for taking input from client
InputStream inputStream = connectionSocketListens.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(
inputStream);
BufferedReader inputFromClient = new BufferedReader(
inputStreamReader);
// for giving output to the client.
OutputStream outputStream = connectionSocketListens.getOutputStream();
// output to client, to send data to the server
DataOutputStream dataOutputStream = new DataOutputStream(
outputStream);
// get output from server
String readingLineFromClientSocket = inputFromClient.readLine();
// sending data to client
String modified = doOperation(readingLineFromClientSocket);
// send data to client
dataOutputStream.writeBytes(modified + "\n");
// Read the request from the client! *** input = inputFromClient
String answer = inputFromClient.readLine();
System.out.println("Request from client "+answer);
Process cmdProc;
cmdProc = null;
// Execute the appropriate command.
if (answer.charAt(0) == '1') {
System.out.println("Responding to date and time request from the client ");
cmdProc = Runtime.getRuntime().exec("date");//MUST ADD TIME
}
if (answer.charAt(0) == '2') {
System.out.println("Responding to uptime request from the client ");
cmdProc = Runtime.getRuntime().exec("date");//MUST CHANGE
}
if (answer.charAt(0) == '3') {
System.out.println("Responding to memory use request from the client ");
cmdProc = Runtime.getRuntime().exec("date");
}
if (answer.charAt(0) == '4') {
System.out.println("Responding to Netstat request from the client ");
cmdProc = Runtime.getRuntime().exec("date");
}
if (answer.charAt(0) == '5') {
System.out.println("Responding to current users request from the client ");
cmdProc = Runtime.getRuntime().exec("date");
}
if (answer.charAt(0) == '6') {
System.out.println("Responding to disk usage request from the client ");
cmdProc = Runtime.getRuntime().exec("date");
}
if (answer.charAt(0) == '7') {
System.out.println("Responding to Quit request from the client ");
cmdProc = Runtime.getRuntime().exec("date");
}
else {
System.out.println("Unknown request ");
//need a socket.close or Server.close(); or something like that
return;
}
//Read the result of the commands and sent the result to the client one line at a time
// followed by the line "ServerDone"
BufferedReader cmdin = new BufferedReader(new InputStreamReader(cmdProc.getInputStream()));
String cmdans;
while ((cmdans = cmdin.readLine()) != null) {
System.out.println(cmdans);
}
System.out.println("ServerDone");
return;
}
}
private static String doOperation(String readingLineFromClientSocket) {
String[] array = readingLineFromClientSocket.split(" ");
StringBuilder strBuilder = new StringBuilder(array.length);
for (int i = array.length - 1; i >= 0; i--) {
String s = charReverse(array[i]);
strBuilder.append(s);
strBuilder.append(" ");
}
return strBuilder.toString();
}
private static String charReverse(String str) {
return new StringBuilder(str).reverse().toString();
}
}
答案 0 :(得分：0)
我做了以下更改后有一个工作版本：
我在Server类中更改了此代码：
String answer = inputFromClient.readLine();
到
//String answer = inputFromClient.readLine();
String answer = modified;
System.out.println("Request from client "+answer);
所有的行如下（除了第一行）：
if (answer.charAt(0) == '2')
需要
else if (answer.charAt(0) == '2')
和 - 至少在Windows上 - 以下行：
cmdProc = Runtime.getRuntime().exec("date");
需要
cmdProc = Runtime.getRuntime().exec("cmd /c date /T");
这一行：
while ((answer = inputFromClient.readLine()) != null && !answer.equals("ServerDone")) {
应该是：
while ((answer = bufferReader.readLine()) != null && !answer.equals("ServerDone")) {
在此之后：
System.out.println(cmdans);
你需要：
dataOutputStream.writeBytes(cmdans + "\n");