Question

我在尝试在简单的Java套接字客户端和简单的C套接字服务器之间来回发送字符串时遇到问题。

它的工作原理如下：

Java客户端将msg发送到C服务器

    out.writeBytes(msg);

C服务器收到消息并放入buf

    if ((numbytes = recv(new_fd, buf, MAXDATASIZE-1, 0)) == -1) {
        perror("recv");
        exit(1);
    }

C服务器将消息发送回Java客户端

    if ((len = send(new_fd, buf, numbytes, 0)) == -1)
        perror("send");

然而，Java客户端无法从C服务器接收消息，我尝试使用DataInputStream，BufferedReader，阅读char[]，byte[]，转换为{ {1}}但无法收到收到的消息。当试图在客户端读取数组时，我有时只会得到第一个让我相信它是阻塞问题的字符？

任何帮助将不胜感激

代码：

C服务器主循环

string

Java客户端

while(1) {  // main accept() loop
    sin_size = sizeof their_addr;
    new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
    if (new_fd == -1) {
        perror("accept");
        continue;
    }

    inet_ntop(their_addr.ss_family,
        get_in_addr((struct sockaddr *)&their_addr),
        s, sizeof s);
    printf("server: got connection from %s\n", s);

    if ((numbytes = recv(new_fd, buf, MAXDATASIZE-1, 0)) == -1) {
        perror("recv");
        exit(1);
    }

    buf[numbytes] = '\0';

    printf("msg size: '%d' bytes\n",numbytes);
    printf("received msg: %s\n",buf);
    char* array = (char*)buf;
    printf("as char array: %s\n", array);


    if (!fork()) { // this is the child process
        close(sockfd); // child doesn't need the listener
        int len = 0;
        if ((len = send(new_fd, buf, numbytes, 0)) == -1)
            perror("send");
        printf("sent %d bytes\n", len);
        close(new_fd);
        exit(0);
    }
    close(new_fd);  // parent doesn't need this
}

无法从C套接字服务器接收数据到Java套接字客户端

0 个答案: