标签：

socket 端口占用 命令：

1. netstat -anpt

现在使用C 的server 端 和java 的client 端进行简单的通信。

server.c

/*
   ============================================================================
Name : server.c
Author : king
Version :
Copyright : Your copyright notice
Description : Hello World in C, Ansi-style
============================================================================
*/
#include <stdlib.h>
#include <pthread.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h> /* inet(3) functions */

#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>

int handle(int point);

int main(void) {
    int sfd, ind;
    struct sockaddr_in addr;
    struct sockaddr_in clent;
    char resv[1024], sendbuf[1024];
    char buf[1024];
    char * myaddr = "127.0.0.1";

    int ret; // 返回值设置
    socklen_t lent;
    int pid;
    addr.sin_family = AF_INET; //IPv4 Internet protocols

    addr.sin_port = htons(5050); //这里输入服务器端口号

    addr.sin_addr.s_addr = inet_addr(myaddr);
    ; //INADDR_ANY表示本机IP

    //獲取socket描述符，IPV4asd
    printf("socket start \n");
    sfd = socket(AF_INET, SOCK_STREAM, 0);

    if (sfd < 0) {
        printf("socket error \n");
        return -1;
    }
    printf("bind start \n");
    //将套接子与指定端口链接
    if (bind(sfd, (struct sockaddr *) &addr, sizeof(struct sockaddr)) < 0) {
        printf("bind error \n");
        return -1;
    }

    //监听套接子
    printf("listen start \n");
    if (listen(sfd, 1024) < 0) {
        printf("listen error \n");
        return -1;
    }

    for (;;) {
        //接受来自客户端的信息
        printf("accept start \n");
        memset(&clent, 0, sizeof(clent));
        lent = sizeof(clent);
        ind = accept(sfd, (struct sockaddr *) &clent, &lent);
        if (ind < 0) {
            printf("accept error %d \n", ind);
            return -1;
        }

        printf("infor \n");
        printf("clent addr%s porit %d\n",
                inet_ntop(AF_INET, &clent.sin_addr, buf, sizeof(buf)),
                ntohs(clent.sin_port));

        pid = fork();

        if (pid == 0) {
            //子进程
            close(sfd);
            handle(ind);
        } else if (pid < 0) {
            //error
            close(ind);
        } else {
            //父进程
        }
    }

    return EXIT_SUCCESS;

}

int handle(int point) {

    int retn;
    char buf[1024];

    for (;;) {
        retn = read(point, buf, sizeof(buf));
        if (retn < 0) {
            printf("read error \n");
            close(point);
            break;
        } else if (retn == 0) {
            printf("client exit \n");
            close(point);
            break;
        }

        printf("client:%s\n", buf);

        if (strcmp("exit", buf) == 0) {
            printf("exit \n");
            close(point);
            return 0;
        }
    }
    return 0;
}

client.c

package HA.Socket;

import java.io.*;
import java.net.*;

 public class SocketClient {
    static Socket client;
    
    public SocketClient(String site, int port){
        try{
            client = new Socket(site,port);
            System.out.println("Client is created! site:"+site+" port:"+port);
        }catch (UnknownHostException e){
            e.printStackTrace();
        }catch (IOException e){
            e.printStackTrace();
        }
    }
    
    public String sendMsg(String msg){
        try{
            BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
            PrintWriter out = new PrintWriter(client.getOutputStream());
            out.println(msg);
            out.flush();
            return in.readLine();
        }catch(IOException e){
            e.printStackTrace();
        }
        return "";
    }
    public void closeSocket(){
        try{
            client.close();
        }catch(IOException e){
            e.printStackTrace();
        }
    }
}

package HA.Socket;

 public class TestSocketClient {

    public static void main(String[] args){
        
        SocketClient client = new SocketClient("127.0.0.1",5050);
        System.out.println(client.sendMsg("test1111111111"));
        client.closeSocket();
    }
}

补充说明： 服务器端和客户端 都要使用相同的端口号。

c 和 java 通过 socket 进行通信

标签：

原文地址：http://blog.csdn.net/tianxuhong/article/details/46743523