目录

• 1、网络基础
• 2、网络协议
• URL类

 实现TCP的网络编程 例子1：客户端发送信息给服务端，服务端将数据显示在控制台上public class TCPTest1 {    //客户端    @Test    public void client() {        Socket socket = null;        OutputStream os = null;        try {            //1.创建Socket对象，指明服务器端的ip和端口号            InetAddress inet = InetAddress.getByName("127.0.0.1");            socket = new Socket(inet, 8899);            //2.获取一个输出流，用于输出数据            os = socket.getOutputStream();            //3.写出数据的操作            os.write("你好，我是客户端mm".getBytes());        } catch (IOException e) {            e.printStackTrace();        } finally {            //4.资源的关闭            if(os != null){                try {                    os.close();                } catch (IOException e) {                    e.printStackTrace();                }            }            if(socket != null){                try {                    socket.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }     }    //服务端    @Test    public void server(){        ServerSocket ss = null;        Socket socket = null;        InputStream is = null;        ByteArrayOutputStream baos = null;        try {            //1.创建服务器的ServerSocket,指明自己的端口号            ss = new ServerSocket(8899);            //2.调用accept()表示接收来自于客户端的socket            socket = ss.accept();            //3.获取输入流            is = socket.getInputStream();            //不建议这样写，可能会有乱码//        byte[] buffer = new byte[1024];//        int len;//        while((len = is.read(buffer)) != -1){//            String str = new String(buffer,0,len);//            System.out.println(str);//        }            //4.读取输入流中的数据            baos = new ByteArrayOutputStream();            byte[] buffer = new byte[5];            int len;            while((len = is.read(buffer)) != -1){                baos.write(buffer,0,len);            }            System.out.println(baos.toString());        } catch (IOException e) {            e.printStackTrace();        } finally {            //5.关闭资源            if(baos != null){                try {                    baos.close();                } catch (IOException e) {                    e.printStackTrace();                }            }            if(is != null){                try {                    is.close();                } catch (IOException e) {                    e.printStackTrace();                }            }            if(socket != null){                try {                    socket.close();                } catch (IOException e) {                    e.printStackTrace();                }            }            if(ss != null){                try {                    ss.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }}

 实现TCP的网络编程 例题2：客户端发送文件给服务端，服务端将文件保存在本地。public class TCPTest2 {    //这里异常处理的方式应该使用try-catch-finally    @Test    public void client() throws IOException {        Socket socket = new Socket(InetAddress.getByName("127.0.0.1"), 9090);        OutputStream os = socket.getOutputStream();        FileInputStream fis = new FileInputStream(new File("beauty.jpg"));        byte[] buffer = new byte[1024];        int len;        while((len = fis.read(buffer)) != -1){            os.write(buffer,0,len);        }        fis.close();        os.close();        socket.close();    }    //这里异常处理的方式应该使用try-catch-finally    @Test    public void server() throws IOException {        ServerSocket ss = new ServerSocket(9090);        Socket socket = ss.accept();        InputStream is = socket.getInputStream();        FileOutputStream fos = new FileOutputStream(new File("beauty1.jpg"));        byte[] buffer = new byte[1024];        int len;        while((len = is.read(buffer)) != -1){            fos.write(buffer,0,len);        }        fos.close();        is.close();        socket.close();        ss.close();    }}

 实现TCP的网络编程 例题3：从客户端发送文件给服务端，服务端保存到本地，并返回"发送成功"给客户端。并关闭相应的连接 public class TCPTest3 {    @Test    public void client() throws IOException {        Socket socket = new Socket(InetAddress.getByName("127.0.0.1"), 9090);        OutputStream os = socket.getOutputStream();        FileInputStream fis = new FileInputStream(new File("beauty.jpg"));        byte[] buffer = new byte[1024];        int len;        while((len = fis.read(buffer)) != -1){            os.write(buffer,0,len);        }        //服务区端给予客户端反馈        OutputStream os1 = socket.getOutputStream();        os.write("你好，美女，照片我以收到，非常漂亮！".getBytes());        fis.close();        os.close();        socket.close();        os1.close();     }    //这里异常处理的方式应该使用try-catch-finally    @Test    public void server() throws IOException {        ServerSocket ss = new ServerSocket(9090);        Socket socket = ss.accept();        InputStream is = socket.getInputStream();        FileOutputStream fos = new FileOutputStream(new File("beauty2.jpg"));        byte[] buffer = new byte[1024];        int len;        while((len = is.read(buffer)) != -1){            fos.write(buffer,0,len);        }        //接受来自于服务器端的数据，并显示到控制台上        InputStream is1 = socket.getInputStream();        ByteArrayOutputStream baos = new ByteArrayOutputStream();        byte[] bufferr = new byte[20];        int len1;        while((len1 = is1.read(buffer)) != -1){            baos.write(buffer,0,len1);        }        System.out.println(baos.toString());        fos.close();        is.close();        socket.close();        ss.close();        baos.close();    }}

UDP协议的网络编程public class UDPTest {    @Test    public void sender() throws IOException {        DatagramSocket socket = new DatagramSocket();         String str = "我是UDP方式发送的导弹";        byte[] data = str.getBytes();        InetAddress inet = InetAddress.getLocalHost();        DatagramPacket packet = new DatagramPacket(data,0,data.length,inet,9090);        socket.send(packet);        socket.close();    }    @Test    public void receiver() throws IOException {        DatagramSocket socket = new DatagramSocket(9090);        byte[] buffer = new byte[100];        DatagramPacket packet = new DatagramPacket(buffer, 0, buffer.length);        socket.receive(packet);        System.out.println(new String(packet.getData(),0,packet.getLength()));    }

  URL网络编程  1.URL:统一资源定位符，对应着互联网的某一资源地址  2.格式：    http://localhost:8080/examples/beauty.jpg?username=Tom    协议   主机名     端口号    资源地址       参数列表 public class URLTest {    public static void main(String[] args) {        try {            URL url = new URL("http://localhost:8080/examples/beauty.jpg?username=Tom");//            public String getProtocol()       获取该URL的协议名            System.out.println(url.getProtocol());// http//            public String getHost()           获取该URL的主机名            System.out.println(url.getHost());//localhost//            public String getPort()           获取该URL的端口号            System.out.println(url.getPort());// 8080//            public String getPath()           获取该URL的文件路径            System.out.println(url.getPath());//examples/beauty.jpg//            public String getFile()           获取该URL的文件名            System.out.println(url.getFile());//examples/beauty.jpg?username=Tom//            public String getQuery()          获取该URL的查询名            System.out.println(url.getQuery());//username=Tom        } catch (MalformedURLException e) {            e.printStackTrace();        }    }}