Tcp----网络编程之客户端向服务端发送文件（图片，文本）

• 客户端向服务端发送文本

public class TcpClient {
    public static void main(String[] args) {
        Socket socket =null;
        OutputStream os =null;

        try {
            InetAddress serverIP = InetAddress.getByName("127.0.0.1");
            int port=9999;

            socket = new Socket(serverIP,port);
            os = socket.getOutputStream();
            os.write("我想你了啊".getBytes());

        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            if(os!=null){
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

public class TcpServer {
    public static void main(String[] args) {
        ServerSocket serverSocket =null;
        Socket socket =null;
        InputStream is =null;
        ByteArrayOutputStream baos =null;
        try {
            serverSocket = new ServerSocket(9999);
            socket = serverSocket.accept();
            is = socket.getInputStream();

            baos = new ByteArrayOutputStream();
            byte[] bytes = new byte[1024];
            int len=0;
            while((len=is.read(bytes))!=-1){
                baos.write(bytes,0,len);
            }
            System.out.println(baos.toString());

        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            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(serverSocket!=null){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

• 客户端向服务端发送图片

这块需要注意的是 **socket.shutdownOutput()**在客户端或者服务端通过socket.shutdownOutput()都是单向关闭的,即关闭客户端的输出流并不会关闭服务端的输出流,所以是一种单方向的关闭流; 通过socket.shutdownOutput()关闭输出流,但socket仍然是连接状态,连接并未关闭 如果直接关闭输入或者输出流,即:in.close()或者out.close(),会直接关闭socket

public class TcpServer2 {
    public static void main(String[] args) throws Exception {
        ServerSocket serverSocket = new ServerSocket(8999);
        Socket socket = serverSocket.accept();
        InputStream inputStream = socket.getInputStream();
        FileOutputStream outputStream = new FileOutputStream(new File("jieshouwenjian.PNG"));


        byte[] bytes = new byte[1024];
        int len=0;
        while((len=inputStream.read(bytes))!=-1){
            outputStream.write(bytes,0,len);
        }
        OutputStream outputStream1 = socket.getOutputStream();
        outputStream1.write("我知道啊，我也很想你".getBytes());

        outputStream.close();
        inputStream.close();
        socket.close();
        serverSocket.close();
    }
}

public class TcpClient2 {
    public static void main(String[] args) throws Exception {
        Socket socket = new Socket(InetAddress.getByName("127.0.0.1"), 8999);
        OutputStream os = socket.getOutputStream();
        FileInputStream fis = new FileInputStream(new File("D:\\IDEA\\网络编程\\src\\捕获.PNG"));
        byte[] bytes = new byte[1024];
        int len=0;
        while((len=fis.read(bytes))!=-1){
            os.write(bytes,0,len);
        }

        socket.shutdownOutput();

        InputStream inputStream = socket.getInputStream();
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        byte[] bytes2 = new byte[1024];
        int len2=0;
        while((len2=inputStream.read(bytes2))!=-1){
            byteArrayOutputStream.write(bytes2,0,len2);
        }
        System.out.println(byteArrayOutputStream.toString());


        inputStream.close();
        byteArrayOutputStream.close();
        fis.close();
        os.close();
        socket.close();
    }
}