TCP:TCP在網絡通訊上面具備頑強的生命力，例如遠程鏈接（Telnet）和文件傳輸（FTP）都須要不定長度的數據被可靠地傳輸，可是這種可靠的傳輸是須要付出代價的，由於對數據內容正確性的檢驗佔用計算機處理時間和網絡寬帶，一次TCP效率不及UDP。java
TCP:可靠，無大小限制，可是須要鏈接創建時間，差錯控制開銷大。網絡
UDP:UDP操做簡單，僅須要較少的監護，所以一般應用於局域網高可靠性的分散系統的Server/Client應用程序,例如視頻會議系統，並不須要徹底保證數據的絕對準確性，只須要保持連貫便可，這種狀況下，顯然UDP要更合理一些。經常使用在交互實時性高的系統上面，如網路遊戲，視頻會議。.net
UDP:不可靠，有大小限制，64KB如下，不須要創建鏈接，差錯控制開銷小。code
Server:視頻
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();
}
}