Kotlin简易UI+简易服务器

实验结果如下

踩过的坑

安卓连网需要权限

需要在全局配置文件中加入

安卓中网络链接不能放在主线程中

新建子线程 在子线程中使用socket

云服务器配置

服务器
地址写为私有ip
客户端
地址写为弹性公网ip

demo

github源码

部分业务代码

一个麻瓜服务器

#include
#include
#include
#include
#include
#include
#include
#include

int main()
{
        int sockfd = socket(AF_INET,SOCK_STREAM,0);
        assert(sockfd!= -1);

        struct sockaddr_in saddr,caddr;
        memset(&saddr,0,sizeof(saddr));
        saddr.sin_family = AF_INET;
        saddr.sin_port = htons(6678);
        saddr.sin_addr.s_addr = inet_addr("192.168.7.255");

        int res = bind(sockfd,(struct sockaddr*)&saddr,sizeof(saddr));
        assert(res != -1);

        listen(sockfd,5);
        while(1)
        {
                int len = sizeof(caddr);
                int c = accept(sockfd,(struct sockaddr*)&caddr,&len);

                if(c < 0)
                {
                        continue;
                }
                printf("ip:%s,port:%d\n",inet_ntoa(caddr.sin_addr),ntohs(caddr.sin_port));

                while(1)
                {
                        char buff[128] = {0};
                        int n = recv(c,buff,40,0);
                        if(n <= 0 )
                        {
                                break;
                        }
                        printf("buff = %s",buff);
                        send(c,"ok",2,0);
                }
                close(c);
                printf("close 1");
        }


        exit(0);

Kotlin客户端代码

class MainActivity : AppCompatActivity()
{

    override fun onCreate(savedInstanceState: Bundle?)
    {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        btn_sign.setOnClickListener()
        {

            var i = 0;
            Thread()
            {

                try{
                    val soc = Socket("119.3.232.83", 6678);

                    val dout = PrintStream(soc.getOutputStream())
                    dout.print("666");
                    i = 2;
                    dout.flush()
                    dout.close()
                    soc.close()
                }
                catch (e:Exception){
                    e.printStackTrace()
                }

            }.start();

        }


    }
}