linux下C++socket示例

修改一下昨天的案例，在linux下实现。在linux下使用Codeblocks将生成的两个执行文件在终端运行即可
删除了客户端输入的cls命令，注意server中的bind()函数在使用前有设置，主要是为了解决问题（如链接所示）:https://blog.youkuaiyun.com/s25691011/article/details/73733808
socket详细过程解释参考https://www.cnblogs.com/cy568searchx/p/4211124.html
server.cpp

#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <iostream>
#include <netinet/in.h>
using namespace std;
int main(){
    //创建套接字
    int serv_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if(serv_sock==-1){cout<<"Socket build failed."<<endl;}
    //将套接字和IP、端口绑定
    struct sockaddr_in serv_addr;
    memset(&serv_addr, 0, sizeof(serv_addr));  //每个字节都用0填充
    serv_addr.sin_family = AF_INET;  //使用IPv4地址
    serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");  //具体的IP地址
    serv_addr.sin_port = htons(1234);  //端口
    const int on=1;
    setsockopt(serv_sock,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on));//设置使bind在重启后不会出现（linux网络编程/tcp_server中server bind失败原因的）
    int bRes=bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr));

    if (-1 == bRes) {cout << "Failed to bind." << endl;}
    else {cout << "Binding success" << endl;}
    //进入监听状态，等待用户发起请求
    int lRes=listen(serv_sock, 20);
    if (-1 == lRes) {cout << "Failed to listen." << endl;}
    else {cout << "Server:Listenning..." << endl;}
    //接收客户端请求
    struct sockaddr_in clnt_addr;
    socklen_t clnt_addr_size = sizeof(clnt_addr);
    int recvClientSocket = accept(serv_sock, (struct sockaddr*)&clnt_addr, &clnt_addr_size);
    if(recvClientSocket==-1){cout<<"Serve receive no client."<<endl;}
    else{cout<<"Serve has receive client"<<endl;}
    //向客户端发送数据
    while(true){
        char recvBuf[1024] = {};
        int reLen = recv(recvClientSocket, recvBuf, 1024, 0);
        if (-1 == reLen) {cout << "Server failed to receive." << endl;}
        else{
            cout << "Client：" << recvBuf << endl;
            if (0 == strcmp("hi", recvBuf)) {
                string verData ="Hello, master Wayne.";
                int sLen = send(recvClientSocket, (char*)verData.c_str(), verData.length(), 0);
                }
            else if (0 == strcmp("version", recvBuf)) {
                string verData = "Version: 1.0.1\nAuthor: JohnWayne\nReleaseData: 2020-02-09";
                int sLen = send(recvClientSocket, (char*)verData.c_str(), verData.length(), 0);
            }
            else if (0 == strcmp("exit", recvBuf)) {
                string verData = "Client request to exit.";
                int sLen = send(recvClientSocket, (char*)verData.c_str(), verData.length(), 0);
                cout << endl << "Exit server." << endl;
                break;
            }
            else {
				cout << "Wrong input:"<<recvBuf << endl;
			}
        }
    }
    //关闭套接字
    close(recvClientSocket);
    close(serv_sock);
    return 0;
}

client.cpp

#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <cstring>
#include <iostream>
using namespace std;
int main(){
    //创建套接字
    int sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if(sock==-1){cout<<"Socket build failed."<<endl;}
    else{cout<<"Socket build success."<<endl;}

    //向服务器（特定的IP和端口）发起请求
    struct sockaddr_in serv_addr;
    memset(&serv_addr, 0, sizeof(serv_addr));  //每个字节都用0填充
    serv_addr.sin_family = AF_INET;  //使用IPv4地址
    serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");  //具体的IP地址
    serv_addr.sin_port = htons(1234);  //端口
    int cRes=connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
    if(cRes==-1){cout<<"Client failed to connect server."<<endl;}
    else{cout<<"client has successfully connected to the server."<<endl;}

    while(true){
        string s;
        cout<<"Input data to send:";
        getline(cin,s);
        write(sock,(char*)s.c_str(),s.length());
        if (0 == strcmp("hi", s.c_str())) {
            char recvBuf[4024] = {};
            int reLen = recv(sock, recvBuf, 4024, 0);
			cout << endl << recvBuf << endl << endl;
        }
        else if (0 == strcmp("version", s.c_str())) {
            char recvBuf[4024] = {};
            int reLen = recv(sock, recvBuf, 4024, 0);
			cout << endl << recvBuf << endl << endl;
        }
        else if (0 == strcmp("exit", s.c_str())) {
			char recvBuf[4024] = {};
			int reLen = recv(sock, recvBuf, 4024, 0);
			cout << endl << recvBuf << endl << endl;
			break;
		}
		else{cout<<"Wrong Input."<<endl;}
    }

    //关闭套接字
    close(sock);
    return 0;
}

此为运行时终端示例