浅谈java的TCP和UDP编程(附实例讲解)
TCP
客户端：
importjava.io.BufferedReader;
importjava.io.InputStreamReader;
importjava.io.PrintWriter;
importjava.net.Socket;
publicclassMyClient{
publicstaticvoidmain(String[]args)throwsException{
Socketsocket=null;
BufferedReaderin=null;
PrintWriterout=null;
BufferedReaderinput=null;
//请求指定ip和端口号的服务器
socket=newSocket("127.0.0.1",3333);
while(true){
in=newBufferedReader(newInputStreamReader(socket.getInputStream()));
out=newPrintWriter(socket.getOutputStream(),true);
//接收控制台的输入
input=newBufferedReader(newInputStreamReader(System.in));
//out.println("thisisclientinfo!");
Stringinfo=input.readLine();
out.println(info);
Stringstr=in.readLine();
System.out.println("客户端显示--》服务器的信息："+str);
}
//in.close();
//out.close();
}
}
服务端：
importjava.io.BufferedReader;
importjava.io.InputStreamReader;
importjava.io.PrintWriter;
importjava.net.ServerSocket;
importjava.net.Socket;
publicclassMyServices{
publicstaticvoidmain(String[]args)throwsException{
ServerSocketss=null;
Socketsocket=null;
BufferedReaderin=null;
PrintWriterout=null;
BufferedReaderinput=null;
//监听3333端口
ss=newServerSocket(3333);
//等待接收客户端的请求
socket=ss.accept();
while(true){
//获取连接对象的输入流
in=newBufferedReader(newInputStreamReader(socket.getInputStream()));
//获取客户端的输入信息
Stringstr=in.readLine();
input=newBufferedReader(newInputStreamReader(System.in));
System.out.println("服务器显示-->客户端输入数据："+str);
out=newPrintWriter(socket.getOutputStream(),true);
//将数据输出到客户端
//out.println("hehe");
Stringinfo=input.readLine();
out.println(info);
}
//in.close();
//out.flush();
//out.close();
}
}
UDP
客户端：
importjava.net.DatagramPacket;
importjava.net.DatagramSocket;
publicclassUDPClient{
publicstaticvoidmain(String[]args)throwsException{
DatagramSocketds=null;
DatagramPacketdp=null;
byte[]buf=newbyte[1024];
ds=newDatagramSocket(3333);
dp=newDatagramPacket(buf,1024);
//接收数据，放入数据报
ds.receive(dp);
//从数据报中取出数据
Stringinfo=newString(dp.getData(),0,dp.getLength());
System.out.println("接收到的信息是："+info);
}
}
服务端：
importjava.net.DatagramPacket;
importjava.net.DatagramSocket;
importjava.net.InetAddress;
publicclassUDPServer{
publicstaticvoidmain(String[]args)throwsException{
DatagramSocketds=null;
DatagramPacketdp=null;
//构建发送对象
ds=newDatagramSocket();
//将数据打包-->打成数据报
Stringinfo="helloworld!";
dp=newDatagramPacket(info.getBytes(),info.length(),InetAddress.getByName("localhost"),3333);
//发出数据报
ds.send(dp);
}
}
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