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。
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