我从 C 中的客户端通过套接字发送线路,并在 Java 中的服务器上读取。我能做到的最好的办法是客户端发送多行,当我关闭客户端时,服务器将所有数据打印在一行中。或者让它先发送然后接收,等等。我的愿望是 C 应用程序在循环中发送“Hi”,Java 文件首先捕获 hi,打印,然后捕获第二个并打印。现在它打印“HiHiHiHi...”,但仅在连接终止时。
我使用oracle 套接字示例作为指南,并使用C 客户端的另一个 指南
所以在Java中读取套接字是:
try {
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(port);
} catch (IOException e) {
System.err.println("Could not listen on port: 4444.");
System.exit(1);
}
Socket clientSocket = null;
try {
clientSocket = serverSocket.accept();
System.out.println("Connected with client");
} catch (IOException e) {
System.err.println("Accept failed.");
System.exit(1);
}
out = new PrintWriter(clientSocket.getOutputStream(), true);
BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null) {
System.out.println("RECEIVING " + inputLine);
}
out.close();
in.close();
clientSocket.close();
serverSocket.close();
} catch (IOException ex) {
Logger.getLogger(Connection.class.getName()).log(Level.SEVERE, null, ex);
} finally {
out.close();
}
尝试在 while 循环中将 C 中的相同字符串写入套接字:
void connection(void) {
int sockfd, portno;
struct sockaddr_in serv_addr;
struct hostent *server;
/* Set time limit. */
timeout.tv_sec = 0;
timeout.tv_usec = 10;
portno = 4444;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
server = gethostbyname("Localhost");
if (server == NULL) {
fprintf(stderr,"ERROR, no such host\n");
exit(0);
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,
server->h_length);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
while(1) {
/* Create a descriptor set containing our two sockets. */
FD_ZERO(&fds);
FD_SET(sockfd, &fds);
rc = select(sizeof(fds)*8, &fds, NULL, NULL, &timeout);
if (rc==-1) {
perror("select failed");
}
bzero(buffer,256);
char *buffer2 = "here";
n = write(sockfd,buffer2,strlen(buffer2));
if (n < 0)
error("ERROR writing to socket");
}
}