我正在尝试修改客户端 - 服务器程序，以便我可以从我想在Windows中运行的客户端连接到用C语言编写的服务器（我在Linux上的VirtualBox中运行），并且用Java编写。
我有一些问题。这是我在Linux上运行的server.c文件：
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <string.h>
void deservire_client(int c) {
// serving the client
int nr, i=2, nrDiv=0, sirDiv[10]={0,0,0,0,0,0,0,0,0,0};
recv(c, &nr, sizeof(nr), MSG_WAITALL);
while ( i <= nr/2){
if ( nr%i == 0){
sirDiv[nrDiv]=i;
nrDiv+=1;
}
i+=1;
}
send(c, &sirDiv, sizeof(sirDiv), 0);
close(c);
// ending of serving the client;
}
int main() {
int s;
struct sockaddr_in server, client;
int c, l;
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0) {
printf("Creating server socket error!\n");
return 1;
}
memset(&server, 0, sizeof(server));
server.sin_port = htons(1234);
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
if (bind(s, (struct sockaddr *) &server, sizeof(server)) < 0) {
printf("Binding Error!\n");
return 1;
}
listen(s, 5);
l = sizeof(client);
memset(&client, 0, sizeof(client));
while (1) {
c = accept(s, (struct sockaddr *) &client, &l);
printf("S-a conectat un client.\n");
if (fork() == 0) { // fiu
deservire_client(c);
return 0;
}
}
}
如您所见，服务器将返回一个整数数组，它将是我从客户端文件发送的数字的除数。
我已经在C中编写了一个客户端文件，只是为了查看它是否有效。我在Linux下运行它们。这是文件：
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <string.h>
#include <unistd.h>
int main() {
int c;
struct sockaddr_in server;
char send_data[1024];
c = socket(AF_INET, SOCK_STREAM, 0);
if (c < 0) {
printf("Creating client socket error!\n");
return 1;
}
memset(&server, 0, sizeof(server));
server.sin_port = htons(1234);
server.sin_family = AF_INET;
server.sin_addr.s_addr = inet_addr("127.0.0.1");
if (connect(c, (struct sockaddr *) &server, sizeof(server)) < 0) {
printf("Connecting to server error!\n");
return 1;
}
while(1){
int nr, sirDiv[10]={0,0,0,0,0,0,0,0,0,0}, i=0;
printf("\nInput number: "); scanf("%d",&nr);
send(c ,&nr, sizeof(nr), 0);
recv(c, &sirDiv, sizeof(sirDiv), 0);
printf("\nThe divisors are:\n");
while( i <= 10 ){
if ( sirDiv[i] <= nr/2 && sirDiv[i] != 0)
printf("%d ",sirDiv[i]);
i+=1;
}
printf("\n");
//Ask client if he wants to close
printf("\nq or Q to exit: ");
scanf("%s",send_data);
if (strcmp(send_data , "q") == 0 || strcmp(send_data , "Q") == 0) {
close(c);
break;
}
}
return 0;
}
所以这在Linux下工作正常，我可以将多个客户端连接到服务器。现在我想创建一个客户端并用Java编写它。这是一个给我的例子，我正在尝试修改：
import java.net.*;
import java.io.*;
public class Client2 {
private static final String SERVER_ADDRESS = "127.0.0.1";
private static final int SERVER_PORT = 1234;
private static final int UNSIGNED_SHORT_MAX_VALUE = 65535;
private static final int UNSIGNED_SHORT_MIN_VALUE = 0;
public static void main(String args[]) {
Socket socket = null;
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(System.in));
socket = new Socket(SERVER_ADDRESS, SERVER_PORT);
int a = readUnsignedShort("a = ", reader);
int b = readUnsignedShort("b = ", reader);
writeIntegersToSocket(a, b, socket);
readIntegersSumFromSocket(socket);
} catch (IOException e) {
System.err.println("Cautgh exception " + e.getMessage());
} finally {
closeStreams(socket,reader);
}
}
private static void readIntegersSumFromSocket(Socket c) throws IOException {
DataInputStream socketIn = new DataInputStream(c.getInputStream());
int s = socketIn.readUnsignedShort();
System.out.println("s = " + s);
}
private static void writeIntegersToSocket(int a, int b, Socket c) throws IOException {
DataOutputStream socketOut = new DataOutputStream(c.getOutputStream());
socketOut.writeShort(a);
socketOut.writeShort(b);
socketOut.flush();
}
private static int readUnsignedShort(String message, BufferedReader reader) throws IOException {
int unsignedShortNumber = 0;
System.out.print(message);
try {
unsignedShortNumber = Integer.parseInt(reader.readLine());
if (unsignedShortNumber < UNSIGNED_SHORT_MIN_VALUE || unsignedShortNumber > UNSIGNED_SHORT_MAX_VALUE) {
throw new IllegalArgumentException("The given number must be unsigned short [0..65535]!");
}
} catch (NumberFormatException e) {
System.err.println("The given input is not an integer!");
}
return unsignedShortNumber;
}
private static void closeStreams(Socket socket, BufferedReader reader) {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
System.err.println("Could not close socket!");
}
}
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
System.err.println("Could not close reader!");
}
}
}
}
此示例是针对客户端 - 服务器程序进行的，该程序允许用户输入两个数字，服务器将返回总和。当我尝试修改它时，我遇到了一些问题。
public static void main(String args[]) {
Socket socket = null;
int i = 0;
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(System.in));
socket = new Socket(SERVER_ADDRESS, SERVER_PORT);
int nr = readUnsignedShort("nr = ", reader);
while(int i <=10)
int sirDiv[i] = readUnsignedShort("b = ", reader);//Here I have an error, type mismatch, how do I fix this?
writeIntegersToSocket(nr, sirDiv, socket);//Again, how do I write this instead?
readIntegersSumFromSocket(socket);
private static void writeIntegersToSocket(int a, int b, Socket c) throws IOException {
DataOutputStream socketOut = new DataOutputStream(c.getOutputStream());
socketOut.writeShort(nr);
socketOut.writeShort(nrDiv); //will probably have an error here as well
socketOut.flush();
}
除了这些类型不匹配之外，我仍然不知道如何连接到我在linux上运行的服务器，我需要更改什么，SERVER_ADDRESS还是什么？在Linux中ping localhost给了我127.0.0.1并在Windows中ping“ping -4 localhost”给了我同样的东西。有人可以给我一些指示吗？我一整天都在努力。