C#3.5之网络编程 简单示例
根据输入的主机地址获取主机IP地址 主机名和DNS主机名
private void button1_Click(object sender, EventArgs e) { //判断是否输入了IP地址 if (textBox1.Text == string.Empty) { MessageBox.Show("请输入主机地址！");//aimajia2012.gotoftp2.com return; } else { textBox2.Text = string.Empty; //获取指定主机的IP地址 IPAddress[] ips = Dns.GetHostAddresses(textBox1.Text); //循环访问获得的IP地址 foreach (IPAddress ip in ips) { textBox2.Text = ip.ToString(); } textBox3.Text = Dns.GetHostName(); //根据指定的主机名获取DNS信息 textBox4.Text = Dns.GetHostEntry(Dns.GetHostName()).HostName; } IPAddressUse(); }
//调用IPAddress类中的各个属性获取指定主机的IP地址信息
private void button1_Click(object sender, EventArgs e) { label5.Text = string.Empty;//初始化Label标签 IPAddress[] ips = Dns.GetHostAddresses(textBox1.Text); foreach (IPAddress ip in ips) { label5.Text = "网际协议地址:" + ip.Address.ToString() + "\nIP地址的地址族:" + ip.AddressFamily.ToString() + "\n是否IPv6链接本地地址:" + ip.IsIPv6LinkLocal; } }
private void button1_Click(object sender, EventArgs e) { textBox1.Text = "220.166.64.67"; //实例化IPEndPoin类对象 IPEndPoint IPEPoint = new IPEndPoint(IPAddress.Parse(textBox1.Text), 80); //使用IPEndPoint类对象获取终结点的IP地址和端口号 label5.Text = "IP地址：" + IPEPoint.Address.ToString() + "\n 端口号:" + IPEPoint.Port; }
//WebClient获取指定网址中的网页内容 private void button2_Click(object sender, EventArgs e) { richTextBox1.Text = string.Empty; //实例化WebClient对象 WebClient wclient = new WebClient(); //设置WebClient的基URI wclient.BaseAddress = textBox5.Text;//如：http://www.baidu.com/ wclient.Encoding = Encoding.UTF8;//指定下载字符串的编码方式 //为WebClient类对象添加标头 wclient.Headers.Add("Content-Type","application/x-www-form-urlencoded"); //使用OpenRead方法获取指定网站的数据，并保存到Stream流中 Stream stream = wclient.OpenRead(textBox5.Text); //使用流Stream声明一个流读取变量sreader StreamReader sreader = new StreamReader(stream); string str = string.Empty; //循环读取从指定网站获得的数据 while ((str = sreader.ReadLine()) != null) { richTextBox1.Text += str + "\n"; } //调用WebClient对象的DownloadFile方法将指定网站的内容保存到文件中 wclient.DownloadFile(textBox5.Text,DateTime.Now.ToFileTime()+".txt"); MessageBox.Show("保存到文件成功"); }
/// <summary> /// 调用WebRequest和WebResponse类中的属性、方法获取指定网站的网页请求信息和网页内容 /// 显示在richTextBox中 /// </summary> private void button3_Click(object sender, EventArgs e) { richTextBox1.Text = string.Empty; //实例化一个WebRequest对象 WebRequest webrequest = WebRequest.Create(textBox5.Text);//http://www.baidu.com/ //设置用于对Internet资源请求进行身份验证的网络凭据 webrequest.Credentials = CredentialCache.DefaultCredentials; //调用WebRequest对象的各种属性获取WebRequest请求的相关信息 richTextBox1.Text = "请求数据的内容长度" + webrequest.ContentLength; richTextBox1.Text += "\n该请求的协议方法:" + webrequest.Method; richTextBox1.Text += "\n访问Internet的网络代理："+webrequest.Proxy; richTextBox1.Text += "\n 与该请求关联的internet URI:" +webrequest.RequestUri; richTextBox1.Text += "\n 超时时间:"+webrequest.Timeout; //调用WebRequest对象的GetResponse方法实例化一个WebResponse对象 WebResponse webresponse = webrequest.GetResponse(); //获取WebResponse响应的Internet资源的URI richTextBox1.Text += "\n 响应该请求的Internet URI：" + webresponse.ResponseUri; //调用WebResponse 对象的GetResponseStream方法返回数据流 Stream stream = webresponse.GetResponseStream(); //使用创建的Stream对象创建一个StreamReader流读取对象 StreamReader sreader = new StreamReader(stream); richTextBox1.Text += "\n"+sreader.ReadToEnd(); sreader.Close(); stream.Close(); webresponse.Close(); }
/// <summary> /// 连接远程主机并获得其主要内容 /// </summary> private static Socket ConnectSocket(string server, int port) { Socket socket = null;//实例化Socket对象,并初始化为空 IPHostEntry iphostentry = null;//实例化IPHostEntry,并初始化为空 iphostentry = Dns.GetHostEntry(server);//获得主机信息 foreach (IPAddress address in iphostentry.AddressList) { //使用指定的IP地址和端口号实例化IPEndPoint对象 IPEndPoint IPEPoint = new IPEndPoint(address,port); //使用Socket的构造函数实例化一个Socket对象，以便用来连接远程主机 Socket newSocket = new Socket(IPEPoint.AddressFamily,SocketType.Stream,ProtocolType.Tcp); newSocket.Connect(IPEPoint);//调用 if (newSocket.Connected) { socket = newSocket; break; } else { continue; } } return socket; } private static string SocketSendReceive(string server, int port) { string request = "GET/HTTP/1.1\n主机："+server+"\n连接：关闭\n"; Byte[] btSend = Encoding.ASCII.GetBytes(request); Byte[] btReceived = new Byte[256]; //调用自定义方法ConnectSocket,使用指定的服务器名和端口号实例化一个Socket对象 Socket socket = ConnectSocket(server,port); if (socket == null) { return ("连接失败！"); } //将请求发送到连接的服务器 socket.Send(btSend,btSend.Length,0); int intContent = 0; string strContent = server + "上的默认页面内容：\n"; do { //从绑定的Socket接收数据 intContent=socket.Receive(btReceived,btReceived.Length,0); strContent+=Encoding.ASCII.GetString(btReceived,0,intContent); } while(intContent>0); return strContent; } private void button1_Click(object sender, EventArgs e) { string server = textBox1.Text;//指定主机名 int port = Convert.ToInt32(textBox2.Text);//指定端口号 //调用自定义方法SocketSendReceive获取指定主机名的主页内容 string strContent = SocketSendReceive(server,port); MessageBox.Show(strContent); }
private void button5_Click(object sender, EventArgs e) { //实例化一个TcpListener对象，并初始化为空 TcpListener tcplistener = null; //实例化一个IPAddress对象，用来表示网络IP地址 如：192.168.1.96 IPAddress ipaddress = IPAddress.Parse(textBox1.Text); //定义一个int类型变量,用来存储端口号 如：8080 int port = Convert.ToInt32(textBox2.Text); tcplistener = new TcpListener(ipaddress,port);//初始化TcpListener对象 tcplistener.Start();//开始TcpListener侦听 richTextBox1.Text = "等待连接...\n"; TcpClient tcpclient = null;//实例化一个TcpClient对象,并赋值为空 if (tcplistener.Pending()) { tcpclient = tcplistener.AcceptTcpClient();//使用TcpClient的构造函数初始化TcpClient对象 } else tcpclient = new TcpClient(textBox1.Text, port);//使用TcpClient的构造函数初始化TcpClient对象 richTextBox1.Text += "连接成功!\n"; tcpclient.Close(); tcplistener.Stop(); }
