package cn.itcast_02;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
/*
* UDP协议接收数据:
* A:创建接收端Socket对象
* B:创建一个数据包(接收容器)
* C:调用Socket对象的接收方法接收数据
* D:解析数据包,并显示在控制台
* E:释放资源
*/
public class ReceiveDemo {
public static void main(String[] args) throws IOException {
// 创建接收端Socket对象
// DatagramSocket(int port)
DatagramSocket ds = new DatagramSocket(10086);
// 创建一个数据包(接收容器)
// DatagramPacket(byte[] buf, int length)
byte[] bys = new byte[1024];
int length = bys.length;
DatagramPacket dp = new DatagramPacket(bys, length);
// 调用Socket对象的接收方法接收数据
// public void receive(DatagramPacket p)
ds.receive(dp); // 阻塞式
// 解析数据包,并显示在控制台
// 获取对方的ip
// public InetAddress getAddress()
InetAddress address = dp.getAddress();
String ip = address.getHostAddress();
// public byte[] getData():获取数据缓冲区
// public int getLength():获取数据的实际长度
byte[] bys2 = dp.getData();
int len = dp.getLength();
String s = new String(bys2, 0, len);
System.out.println(ip + "传递的数据是:" + s);
// 释放资源
ds.close();
}
}
package cn.itcast_04;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
/*
* 多次启动接收端:
* java.net.BindException: Address already in use: Cannot bind
* 端口被占用。
*/
public class ReceiveDemo {
public static void main(String[] args) throws IOException {
// 创建接收端的Socket对象
DatagramSocket ds = new DatagramSocket(12345);
while (true) {
// 创建一个包裹
byte[] bys = new byte[1024];
DatagramPacket dp = new DatagramPacket(bys, bys.length);
// 接收数据
ds.receive(dp);
// 解析数据
String ip = dp.getAddress().getHostAddress();
String s = new String(dp.getData(), 0, dp.getLength());
System.out.println("from " + ip + " data is : " + s);
}
// 释放资源
// 接收端应该一直开着等待接收数据,是不需要关闭
// ds.close();
}
}
package cn.itcast_01;
import java.net.InetAddress;
import java.net.UnknownHostException;
/*
* 如果一个类没有构造方法:
* A:成员全部是静态的(Math,Arrays,Collections)
* B:单例设计模式(Runtime)
* C:类中有静态方法返回该类的对象(InetAddress)
* class Demo {
* private Demo(){}
*
* public static Demo getXxx() {
* return new Demo();
* }
* }
*
* 看InetAddress的成员方法:
* public static InetAddress getByName(String host):根据主机名或者IP地址的字符串表示得到IP地址对象
*/
public class InetAddressDemo {
public static void main(String[] args) throws UnknownHostException {
// public static InetAddress getByName(String host)
// InetAddress address = InetAddress.getByName("liuyi");
// InetAddress address = InetAddress.getByName("192.168.12.92");
InetAddress address = InetAddress.getByName("192.168.12.63");
// 获取两个东西:主机名,IP地址
// public String getHostName()
String name = address.getHostName();
// public String getHostAddress()
String ip = address.getHostAddress();
System.out.println(name + "---" + ip);
}
}
package cn.itcast_02;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
/*
* UDP协议发送数据:
* A:创建发送端Socket对象
* B:创建数据,并把数据打包
* C:调用Socket对象的发送方法发送数据包
* D:释放资源
*/
public class SendDemo {
public static void main(String[] args) throws IOException {
// 创建发送端Socket对象
// DatagramSocket()
DatagramSocket ds = new DatagramSocket();
// 创建数据,并把数据打包
// DatagramPacket(byte[] buf, int length, InetAddress address, int port)
// 创建数据
byte[] bys = "hello,udp,我来了".getBytes();
// 长度
int length = bys.length;
// IP地址对象
InetAddress address = InetAddress.getByName("192.168.12.92");
// 端口
int port = 10086;
DatagramPacket dp = new DatagramPacket(bys, length, address, port);
// 调用Socket对象的发送方法发送数据包
// public void send(DatagramPacket p)
ds.send(dp);
// 释放资源
ds.close();
}
}
package cn.itcast_05;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
public class SendThread implements Runnable {
private DatagramSocket ds;
public SendThread(DatagramSocket ds) {
this.ds = ds;
}
@Override
public void run() {
try {
// 封装键盘录入数据
BufferedReader br = new BufferedReader(new InputStreamReader(
System.in));
String line = null;
while ((line = br.readLine()) != null) {
if ("886".equals(line)) {
break;
}
// 创建数据并打包
byte[] bys = line.getBytes();
// DatagramPacket dp = new DatagramPacket(bys, bys.length,
// InetAddress.getByName("192.168.12.92"), 12345);
DatagramPacket dp = new DatagramPacket(bys, bys.length,
InetAddress.getByName("192.168.12.255"), 12306);
// 发送数据
ds.send(dp);
}
// 释放资源
ds.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
package cn.itcast_03;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
public class SendDemo {
public static void main(String[] args) throws IOException {
// 创建发送端的Socket对象
DatagramSocket ds = new DatagramSocket();
// 创建数据并打包
byte[] bys = "helloworld".getBytes();
DatagramPacket dp = new DatagramPacket(bys, bys.length,
InetAddress.getByName("192.168.12.92"), 12345);
// 发送数据
ds.send(dp);
// 释放资源
ds.close();
}
}
package cn.itcast_04;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
/*
* 数据来自于键盘录入
* 键盘录入数据要自己控制录入结束。
*/
public class SendDemo {
public static void main(String[] args) throws IOException {
// 创建发送端的Socket对象
DatagramSocket ds = new DatagramSocket();
// 封装键盘录入数据
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String line = null;
while ((line = br.readLine()) != null) {
if ("886".equals(line)) {
break;
}
// 创建数据并打包
byte[] bys = line.getBytes();
// DatagramPacket dp = new DatagramPacket(bys, bys.length,
// InetAddress.getByName("192.168.12.92"), 12345);
DatagramPacket dp = new DatagramPacket(bys, bys.length,
InetAddress.getByName("192.168.12.255"), 12345);
// 发送数据
ds.send(dp);
}
// 释放资源
ds.close();
}
}
package cn.itcast_06;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
/*
* TCP协议发送数据:
* A:创建发送端的Socket对象
* 这一步如果成功,就说明连接已经建立成功了。
* B:获取输出流,写数据
* C:释放资源
*
* 连接被拒绝。TCP协议一定要先看服务器。
* java.net.ConnectException: Connection refused: connect
*/
public class ClientDemo {
public static void main(String[] args) throws IOException {
// 创建发送端的Socket对象
// Socket(InetAddress address, int port)
// Socket(String host, int port)
// Socket s = new Socket(InetAddress.getByName("192.168.12.92"), 8888);
Socket s = new Socket("192.168.12.92", 8888);
// 获取输出流,写数据
// public OutputStream getOutputStream()
OutputStream os = s.getOutputStream();
os.write("hello,tcp,我来了".getBytes());
// 释放资源
s.close();
}
}
package cn.itcast_07;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class ServerDemo {
public static void main(String[] args) throws IOException {
// 创建服务器Socket对象
ServerSocket ss = new ServerSocket(9999);
// 监听客户端的连接
Socket s = ss.accept(); // 阻塞
// 获取输入流
InputStream is = s.getInputStream();
byte[] bys = new byte[1024];
int len = is.read(bys); // 阻塞
String server = new String(bys, 0, len);
System.out.println("server:" + server);
// 获取输出流
OutputStream os = s.getOutputStream();
os.write("数据已经收到".getBytes());
// 释放资源
s.close();
// ss.close();
}
}
package cn.itcast_06;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
/*
* TCP协议接收数据:
* A:创建接收端的Socket对象
* B:监听客户端连接。返回一个对应的Socket对象
* C:获取输入流,读取数据显示在控制台
* D:释放资源
*/
public class ServerDemo {
public static void main(String[] args) throws IOException {
// 创建接收端的Socket对象
// ServerSocket(int port)
ServerSocket ss = new ServerSocket(8888);
// 监听客户端连接。返回一个对应的Socket对象
// public Socket accept()
Socket s = ss.accept(); // 侦听并接受到此套接字的连接。此方法在连接传入之前一直阻塞。
// 获取输入流,读取数据显示在控制台
InputStream is = s.getInputStream();
byte[] bys = new byte[1024];
int len = is.read(bys); // 阻塞式方法
String str = new String(bys, 0, len);
String ip = s.getInetAddress().getHostAddress();
System.out.println(ip + "---" + str);
// 释放资源
s.close();
// ss.close(); //这个不应该关闭
}
}
package cn.itcast_08;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
public class ServerDemo {
public static void main(String[] args) throws IOException {
// 创建服务器Socket对象
ServerSocket ss = new ServerSocket(22222);
// 监听客户端连接
Socket s = ss.accept();
// 包装通道内容的流
BufferedReader br = new BufferedReader(new InputStreamReader(
s.getInputStream()));
String line = null;
while ((line = br.readLine()) != null) {
System.out.println(line);
}
// br.close();
s.close();
// ss.close();
}
}
package cn.itcast_08;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
/*
* 客户端键盘录入,服务器输出到控制台
*/
public class ClientDemo {
public static void main(String[] args) throws IOException {
// 创建客户端Socket对象
Socket s = new Socket("192.168.12.92", 22222);
// 键盘录入数据
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
// 把通道内的流给包装一下
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(
s.getOutputStream()));
String line = null;
while ((line = br.readLine()) != null) {
// 键盘录入数据要自定义结束标记
if ("886".equals(line)) {
break;
}
bw.write(line);
bw.newLine();
bw.flush();
}
// 释放资源
// bw.close();
// br.close();
s.close();
}
}
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