java与c 通信_Java与C之间的socket通信 代码

以下是一个简单的Java与C之间的socket通信的示例代码：

Java端代码：

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

public class JavaSocket {
    public static void main(String[] args) {
        try {
            Socket socket = new Socket("localhost", 8888);
            PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

            String inputLine, outputLine;
            outputLine = "Hello from Java!";
            out.println(outputLine);

            while ((inputLine = in.readLine()) != null) {
                System.out.println("Received from C: " + inputLine);
                outputLine = "Hello from Java again!";
                out.println(outputLine);
            }

            out.close();
            in.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

C语言端代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define PORT 8888
#define MAXLINE 1024

int main() {
    int sockfd;
    struct sockaddr_in servaddr;
    char sendline[MAXLINE], recvline[MAXLINE];

    sockfd = socket(AF_INET, SOCK_STREAM, 0);

    bzero(&servaddr, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    servaddr.sin_port = htons(PORT);

    connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));

    while (fgets(sendline, MAXLINE, stdin) != NULL) {
        send(sockfd, sendline, strlen(sendline), 0);

        if (recv(sockfd, recvline, MAXLINE, 0) == 0) {
            printf("Server terminated prematurely\n");
            exit(1);
        }

        printf("Received from Java: %s", recvline);
    }

    close(sockfd);
    exit(0);
}

这段代码中，Java端通过socket连接到本地的8888端口，向C语言端发送一条消息，并通过输入流接收C语言端的回复。C语言端通过socket连接到本地的8888端口，接收Java端的消息，并向Java端发送一条回复。运行这两个程序，可以看到它们之间的交互。