TCP:TCP在网络通讯上面具备顽强的生命力，例如远程链接（Telnet）和文件传输（FTP）都须要不定长度的数据被可靠地传输，可是这种可靠的传输是须要付出代价的，由于对数据内容正确性的检验占用计算机处理时间和网络宽带，一次TCP效率不及UDP。java
TCP:可靠，无大小限制，可是须要链接创建时间，差错控制开销大。网络
UDP:UDP操做简单，仅须要较少的监护，所以一般应用于局域网高可靠性的分散系统的Server/Client应用程序,例如视频会议系统，并不须要彻底保证数据的绝对准确性，只须要保持连贯便可，这种状况下，显然UDP要更合理一些。经常使用在交互实时性高的系统上面，如网路游戏，视频会议。.net
UDP:不可靠，有大小限制，64KB如下，不须要创建链接，差错控制开销小。code
Server:视频
package com.wangbiao.test;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
public class Server {
// server
public static void server() throws Exception {
ServerSocket server = new ServerSocket(8888);
String message = "hello everyone";
System.out.println("Server is up.waiting for connect");
Socket client = server.accept();
// OutputStream out=client.getOutputStream();
// byte[] b=new byte[1024];
// out.write(b);
// System.out.println(new String(b,0,b.length));
PrintStream ps = new PrintStream(client.getOutputStream());
ps.println(message);
ps.close();
client.close();
server.close();
}
// server chat with client
public static void server_chat() throws Exception {
ServerSocket server = new ServerSocket(8888);
Socket client = null;
BufferedReader in = null;
PrintStream out = null;
boolean working = true;
boolean flag = true;
while (working) {
System.out.println("Server is waiting for connect");
client = server.accept();
in = new BufferedReader(new InputStreamReader(
client.getInputStream()));
out = new PrintStream(client.getOutputStream());
while (flag) {
String str = in.readLine();
if (null == str || "".equals(str)) {
flag = false;
} else {
if ("bye".equals(str)) {
flag = false;
} else {
System.out.println("Cient:" + str);
out.println("Server:" + str);
}
}
}
}
in.close();
out.close();
client.close();
server.close();
}
// UDP
public static void send_message() throws Exception {
DatagramPacket dp=null;
DatagramSocket ds=null;
String content="hello UDP";
ds=new DatagramSocket(3000);
dp=new DatagramPacket(content.getBytes(),content.length(),InetAddress.getByName("localhost"),9000);
ds.send(dp);
ds.close();
}
public static void main(String[] args) throws Exception {
// server();
//server_chat();
send_message();
}
}
Client:server
package com.wangbiao.test;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.Socket;
import java.net.UnknownHostException;
public class Client {
// client
public static void client() throws Exception {
Socket client = new Socket("localhost", 8888);
String str = "test";
BufferedReader br = new BufferedReader(new InputStreamReader(
client.getInputStream()));
String content = br.readLine();
System.out.println(content);
br.close();
client.close();
}
// server chat with client
public static void client_chat() throws Exception {
Socket client = new Socket("localhost", 8888);
BufferedReader input = new BufferedReader(new InputStreamReader(
System.in));
BufferedReader in = new BufferedReader(new InputStreamReader(
client.getInputStream()));
PrintStream out = new PrintStream(client.getOutputStream());
boolean flag = true;
while (flag) {
String str = input.readLine();
out.println(str);
if ("bye".equals(str)) {
flag = false;
} else {
String mess=in.readLine();
System.out.println(mess);
}
}
in.close();
out.close();
client.close();
}
// UDP
public static void receive_message() throws Exception {
DatagramPacket dp=null;
DatagramSocket ds=null;
byte[] b=new byte[1024];
ds=new DatagramSocket(9000);
dp=new DatagramPacket(b, 1024);
ds.receive(dp);
System.out.println("waiting for server message");
String content=dp.getAddress().getHostAddress()+"-"+new String(dp.getData());
System.out.println(content);
ds.close();
}
public static void main(String[] args) throws Exception {
//client();
//client_chat();
receive_message();
}
}