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//ServerTest.java
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
public class ServerTest {
public static void main(String[] args){
ServerSocket ss = null;
Socket s = null;
try{
ss = new ServerSocket(2222);
}catch(IOException e){
e.printStackTrace();
System.exit(-1);
}while(true){
try{
s= ss.accept();
System.out.println("LocalPort:" + s.getLocalPort());
System.out.println("Port:" + s.getPort());
System.out.println("InetAddress:" + s.getInetAddress().getHostAddress());
System.out.println("LocalAddress:" + s.getLocalAddress().getHostAddress());
//只读发来消息的线程
new Thread(new MessageRead(s,"Client")).start();
new Thread(new MessageWrite(s,"Server")).start();
}catch (IOException e){
e.printStackTrace();
System.exit(-1);
}
}// ss.close();
}
}
//NetTest.java
//java.lang.*;
math包 基本类型封装对象 System Enum String* Thread* Exception*
//java.io.*;
流 RW流 Stream流 文件操作File
//java.util.*;
容器 date Iterator 泛型 list set map 计时器Timer
//java.sql.*;
//java.net.*;
//java.nio.*;
import java.io.*;
import java.net.Socket;
public class NetTest {
public static void main(String[] args){
Socket s = null;
try{
s = new Socket("127.0.0.1",2222);
//只读发来消息的线程
new Thread(new MessageRead(s,"Server")).start();
new Thread(new MessageWrite(s,"Client")).start();
//由此线程销毁套接字}catch(IOException e){
e.printStackTrace();
System.exit(-1);
}}
}
class MessageWrite implements Runnable {
Socket s;
String localName;
MessageWrite(Socket s,String localName) {
this.s = s;
this.localName = localName;
}@Override
public void run() {
DataOutputStream dos = null;
BufferedReader br = null;
try {
dos = new DataOutputStream(s.getOutputStream());
br = new BufferedReader(new InputStreamReader(System.in));
String sb;
while (!(sb = br.readLine()).equalsIgnoreCase("exit")) {System.out.print(localName + ":" + sb);
System.out.println();
dos.writeUTF(sb);
}br.close();
//从输入设备中读入
dos.flush();
//写到Socket
dos.close();
//关闭Socket流//让消息发送对象接管Socket关闭
s.close();
//关闭Socket
} catch (IOException e) {
e.printStackTrace();
System.exit(-1);
}}
}
class MessageRead implements Runnable{
Socket s;
String remoteName;
MessageRead(Socket s,String remoteName){
this.s = s;
this.remoteName = remoteName;
}@Override
public void run() {
DataInputStream dis = null;
try{
dis = new DataInputStream(s.getInputStream());
while(true){
System.out.print(remoteName + "：" + dis.readUTF());
System.out.println();
}//dis.close();
//从Socket读入
}catch(IOException e){
e.printStackTrace();
System.exit(-1);
}}
}
//UDPRecive.java
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
public class UDPRecive {
public static void main(String[] args){
byte[] buffer = new byte[1024];
DatagramPacket dp = new DatagramPacket(buffer,buffer.length);
DatagramSocket ds = null;
DataInputStream dis = null;
ByteArrayInputStream bais = null;
try {
ds = new DatagramSocket(6666);
} catch (SocketException e) {
e.printStackTrace();
}while(true){
try {
ds.receive(dp);
} catch (IOException e) {
e.printStackTrace();
}bais = new ByteArrayInputStream(buffer);
dis = new DataInputStream(bais);
try {
System.out.println(dis.readLong());
} catch (IOException e) {
e.printStackTrace();
}}
}
}
//UDPSend.java
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;
public class UDPSend {
public static void main(String[] args){ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
try {
dos.writeLong(12345678900l);
} catch (IOException e) {
e.printStackTrace();
}byte[] buffer = baos.toByteArray();
DatagramPacket dp = new DatagramPacket(buffer,buffer.length,new InetSocketAddress("127.0.0.1",6666));
DatagramSocket ds = null;
try {
ds = new DatagramSocket();
} catch (SocketException e) {
e.printStackTrace();
}try {
ds.send(dp);
} catch (IOException e) {
e.printStackTrace();
}
ds.close();
}
}
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