一、Tomcat
服务端
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自定义 S
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Tomcat服务器 S ：Java后台开发
客户端
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自定义 C
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浏览器 B
认识一些常用的目录：
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bin：存放开始和结束的程序
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conf：配置文件
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lib：组成包
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logs：输出日志
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webapps：网页内容
二、UDP
发短信：不用连接，需要知道对方的地址
//还是要等待客户端的连接
public class UdpServerDemo01 {public static void main(String[] args) throws Exception {//开放端口DatagramSocket socket = new DatagramSocket(9090);//接收数据包byte[] bytes = new byte[1024];DatagramPacket packet = new DatagramPacket(bytes, 0, bytes.length);//接收
socket.receive(packet);
System.out.println(packet.getAddress().getHostAddress());System.out.println(new String(packet.getData(),0,packet.getLength()));
//关闭连接socket.close();}
}
//不需要连接服务器
public class UdpClientDemo01 {public static void main(String[] args) throws Exception {//1.建立一个SocketDatagramSocket socket = new DatagramSocket();//2.建个包String msg ="你好啊服务器";//发送给谁InetAddress localhost = InetAddress.getByName("localhost");int port = 9090;//数据，数据的长度起始，要发送给谁DatagramPacket packet = new DatagramPacket(msg.getBytes(), 0, msg.getBytes().length, localhost, port);//3.发送包socket.send(packet);//4.关闭流socket.close();}
}
三、URL
百度一下，你就知道
统一资源定位符：定位资源的，定位互联网上的某一个资源
DNS域名解析 www.baidu.com xxx.x..x..x
协议://ip地址: 端口/项目名/目录
public class URLDemo01 {public static void main(String[] args) throws MalformedURLException {URL url = new URL("http://localhost:8080/helloworld/index.jsp?username=kuangshen&password=123");
System.out.println(url.getProtocol());//协议System.out.println(url.getHost());//主机ipSystem.out.println(url.getPort());//端口System.out.println(url.getPath());//全路径System.out.println(url.getFile());//文件System.out.println(url.getQuery());//参数try {HttpsURLConnection urlConnection = (HttpsURLConnection) url.openConnection();InputStream inputStream = urlConnection.getInputStream();} catch (IOException e) {throw new RuntimeException(e);}
}
}
