無法使用Socket連接將數據發送到c服務器

Question

這是我的c代碼。它接收客戶端發送的數據並向客戶端發送問候語。

#include <stdio.h> 
#include <unistd.h> 
#include <string.h> 
#include <sys/types.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include<errno.h> 
#include<arpa/inet.h> 

#define PORT 6865 
#define BUF 1024 

int main(int argc, char *argv[]) 
{ 
    struct sockaddr_in host, remote; 
    int host_fd, remote_fd; 
    int size = sizeof(struct sockaddr);; 
    int read_t; 
    char send_t[]="hello"; 
    char data[BUF]; 

    host.sin_family = AF_INET; 
    host.sin_addr.s_addr = htonl(INADDR_ANY); 
    host.sin_port = htons(PORT); 
    memset(&host.sin_zero, 0, sizeof(host.sin_zero)); 

    host_fd = socket(AF_INET, SOCK_STREAM, 0); 
    if(host_fd == -1) 
    { 
     printf("socket error %d\n", host_fd); 
     return 1; 
    } 

    if(bind(host_fd, (struct sockaddr *)&host, size)) 
    { 
     perror("bind error is\n"); 
     printf("errorno is %d\n",errno); 
     return 1; 
    } 

    if(listen(host_fd, 5)) 
    { 

     printf("listen error"); 
     return 1; 
    } 

    printf("Server setup, waiting for connection...\n"); 
    remote_fd = accept(host_fd, (struct sockaddr *)&remote, &size); 

    printf("connection made\n"); 

    read_t = recv(remote_fd,data,sizeof(data),0); 

    data[read_t]='\0'; 
    printf("read = %d, data = %s\n", read_t, data); 
    if(send(remote_fd,send_t,sizeof(send_t),0)==-1) 
    { 
     printf("error in sending back\n"); 
     return 1; 
    } 
    //memset(data[BUF],0,sizeof(data)); 
    //read_t = recv(remote_fd,data,sizeof(data),0); 
    //data[read_t]='\0'; 
    //printf("read = %d, received_data = %s \n", sizeof(data), data); 
    shutdown(remote_fd, SHUT_RDWR); 
    close(remote_fd); 

    return 0; 
} 

這是客戶端Java代碼。

package pack.client; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.io.OutputStreamWriter; 
import java.net.Socket; 
import java.net.UnknownHostException; 

public class Client 
{ 
    public static void main(String[] args) throws UnknownHostException, IOException 
    { 
     char[] data = new char[10]; 
     OutputStreamWriter outs = null; 
     InputStreamReader ins= null; 

     Socket s = new Socket("10.9.79.80", 6865); 
     outs = new OutputStreamWriter(s.getOutputStream()); 
     outs.append("Socket communication"); 

     ins= new InputStreamReader(s.getInputStream()); 
     int da = ins.read(data, 0, 9); 
     System.out.print(data); 

     outs.close(); 
     ins.close(); 
     s.close(); 
    } 
} 

當客戶端與服務器進行連接時，我可以看到終端上的連接消息，但服務器沒有收到數據。

Answer 1

您需要在寫入服務器之後刷新輸出流。

outs.append("Socket communication"); 
// or try this outs.write("Socket communication"); 
    outs.flush();