Java网络编程实例-优快云博客

java 代码

package Lesson10;
import java.net.*;
import java.io.*;
public class Lesson10 {
public static void main(String[] args) {
if(args.length>0)
server();
else client();
}
public static void server() {
try {
ServerSocket ss = new ServerSocket(6001);
Socket s = ss.accept();
OutputStream os = s.getOutputStream();
InputStream is = s.getInputStream();
os.write("welcome!".getBytes());
byte[] buf = new byte[100];
int len = is.read(buf);//输入流写到buf中
System.out.println(new String(buf,0,len));
os.close();
is.close();
s.close();
ss.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
public static void client() {
try{
Socket s = new Socket(InetAddress.getByName(null),6001);
InputStream is = s.getInputStream();
OutputStream os = s.getOutputStream();
byte[] buf = new byte[100];
int len = is.read(buf);
System.out.println(new String(buf,0,len));
os.write("zhangsan online".getBytes());
is.close();
os.close();
s.close();
}
catch(Exception e) {
e.printStackTrace();
}
}
}
//运行参数配置:Run -> Run... ->选择好Project 和 Main Class -> Name 为server
//(X)Arguments 随便输入一个字符(串) -> Name :client ->运行server 运行client

java 代码

package lesson10;
import java.net.*;
import java.io.*;
public class Lesson10 extends Thread
{
public static void main(String[] args)
{
if(args.length>0)
recv();
else
send();
}
public static void recv()
{
try {
DatagramSocket ds=new DatagramSocket(6000);
byte[] buf=new byte[100];
DatagramPacket dp=new DatagramPacket(buf,100);
ds.receive(dp);
System.out.println(new String(buf,0,dp.getLength()));
String str="Welcome you!";
DatagramPacket dpSend=new DatagramPacket(str.getBytes(),str.length(),
dp.getAddress(),dp.getPort());
ds.send(dpSend);
ds.close();
}
catch (Exception ex) {
ex.printStackTrace();
}
}
public static void send()
{
try {
DatagramSocket ds=new DatagramSocket();
String str="Hello,this is zhangsan";
DatagramPacket dp=new DatagramPacket(str.getBytes(),str.length(),
InetAddress.getByName("localhost"),
6000);
ds.send(dp);
byte[] buf=new byte[100];
DatagramPacket dpRecv=new DatagramPacket(buf,100);
ds.receive(dpRecv);
System.out.println(new String(buf,0,dpRecv.getLength()));
ds.close();
}
catch (Exception ex) {
ex.printStackTrace();
}
}

java 代码

package Lesson10;
import java.net.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
public class Download
{
public static void main(String[] args)
{
JFrame jf=new JFrame("维新下载程序");
jf.setSize(600,400);
jf.setLocation(100,100);
JPanel p=new JPanel();
JLabel l=new JLabel("Please input URL:");
final JTextField tf=new JTextField(30);
p.add(l);
p.add(tf);
jf.getContentPane().add(p,"North");
final JTextArea ta=new JTextArea();
jf.getContentPane().add(ta,"Center");
JButton btn=new JButton("Download");
jf.getContentPane().add(btn,"South");
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String str=tf.getText();
try {
URL url=new URL(str);
URLConnection urlConn=url.openConnection();
String line=System.getProperty("line.separator");//行分隔符
ta.append("Host: "+url.getHost());
ta.append(line);
ta.append("Port: "+url.getDefaultPort());
ta.append(line);
ta.append("ContentType: "+urlConn.getContentType());
ta.append(line);
ta.append("ContentLength: "+urlConn.getContentLength());
InputStream is=urlConn.getInputStream();
//InputStreamReader isr=new InputStreamReader(is);//字节流转化为字符流
//BufferedReader br=new BufferedReader(isr);//字符流方式读取
FileOutputStream fos=new FileOutputStream("1.html");
//String strLine;
//while((strLine=br.readLine())!=null)
int data;
while((data=is.read())!=-1)//以字节流的方式读取
{
// fos.write(strLine.getBytes());//字符流方式读取
// fos.write(line.getBytes());
fos.write(data);
}
//br.close();
is.close();
fos.close();
}
catch (Exception ex) {
ex.printStackTrace();
}
}
});
jf.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
jf.setVisible(true);
}
}

java笔记十