Let IE write the server program as the client:
[Java]
Package net. csdn. web;
Import java. io. IOException;
Import java. io. PrintWriter;
Import java.net. ServerSocket;
Import java.net. Socket;
Public class ServerDemo {
/**
* @ Param args
* @ Throws IOException
*/
Public static void main (String [] args) throws IOException {
// TODO Auto-generated method stub
ServerSocket ss = new ServerSocket (9009 );
Socket s = ss. accept ();
System. out. println (s. getInetAddress (). getHostAddress () + "...... conection ");
PrintWriter pwout = new PrintWriter (s. getOutputStream (), true );
Pwout. println ("Access successful ");
S. close ();
// Ss. close ();
}
}
Package net. csdn. web;
Import java. io. IOException;
Import java. io. PrintWriter;
Import java.net. ServerSocket;
Import java.net. Socket;
Public class ServerDemo {
/**
* @ Param args
* @ Throws IOException
*/
Public static void main (String [] args) throws IOException {
// TODO Auto-generated method stub
ServerSocket ss = new ServerSocket (9009 );
Socket s = ss. accept ();
System. out. println (s. getInetAddress (). getHostAddress () + "...... conection ");
PrintWriter pwout = new PrintWriter (s. getOutputStream (), true );
Pwout. println ("Access successful ");
S. close ();
// Ss. close ();
}
}
Connect socket:
Client:
[Java]
Package net. csdn. web;
Import java. io. IOException;
Import java.net. InetSocketAddress;
Import java.net. Socket;
Public class ConnectClient {
Public static void main (String [] args ){
Try {
Socket s = new Socket ();
InetSocketAddress isa = new InetSocketAddress ("192.168.49.58", 9001 );
S. connect (isa, 5000 );
// Equal to Socket s = new Socket ("192.168.49.58", 9001 ));
} Catch (IOException e ){
// TODO Auto-generated catch block
E. printStackTrace ();
}
}
}
Package net. csdn. web;
Import java. io. IOException;
Import java.net. InetSocketAddress;
Import java.net. Socket;
Public class ConnectClient {
Public static void main (String [] args ){
Try {
Socket s = new Socket ();
InetSocketAddress isa = new InetSocketAddress ("192.168.49.58", 9001 );
S. connect (isa, 5000 );
// Equal to Socket s = new Socket ("192.168.49.58", 9001 ));
} Catch (IOException e ){
// TODO Auto-generated catch block
E. printStackTrace ();
}
}
}
Server
[Java]
Package net. csdn. web;
Import java. io. IOException;
Import java.net. ServerSocket;
Import java.net. Socket;
Public class ConnectServer {
Public static void main (String [] args) throws IOException {
ServerSocket ss = new ServerSocket (9002 );
Socket s = ss. accept ();
System. out. println (s. getInetAddress (). getHostAddress () + "...... conection ");
}
}
Package net. csdn. web;
Import java. io. IOException;
Import java.net. ServerSocket;
Import java.net. Socket;
Public class ConnectServer {
Public static void main (String [] args) throws IOException {
ServerSocket ss = new ServerSocket (9002 );
Socket s = ss. accept ();
System. out. println (s. getInetAddress (). getHostAddress () + "...... conection ");
}
}
URL:
The class URL represents a uniform resource locator, which is a pointer to the Internet "resource. Resources can be simple files or directories, or references to more complex objects.
Two common constructor methods:
URL (String spec): Creates a URL object based on the String representation.
URL (URL context, String spec): Creates a URL by parsing the specified spec in the specified context.
Example:
URL url = new URL ("http://www.baidu.com ");
Relative URL objects are generally used in HTML files, for example:
URL urlbaidu = new URL ("http://www.baidu.com ");
URL urlbaidu_a = new URL (urlbaidu, "a.html ");
URL urlbaidu_ B = new URL (urlbaidu, "B .html ");
Common call methods for accessing resources corresponding to a URL:
String getFile (): get the name of the URL file.
String getHost (): Obtain the Host Name of the URL (if applicable ).
String getPath (): Obtain the path of this URL.
Int getPort (): gets the port number of this URL.
String getProtocol (): gets the protocol name of this URL.
String getQuery (): Obtain the query part of this URL.
URLConnection openConnection (): returns a URLConnection object, which indicates the connection to the remote object referenced by the URL.
InputStream openStream (): Open the connection to this URL and return an InputStream used to read from this connection.
[Java]
Package net. csdn. web;
Import java.net. MalformedURLException;
Import java.net. URL;
Public class UrlDemo {
/**
* @ Param args
*/
Public static void main (String [] args ){
// TODO Auto-generated method stub
Try {
URL url = new URL ("http://dianying.taobao.com /? Spm = 1.1000386.221827.9 ");
System. out. println ("protocol =" + url. getProtocol ());
System. out. println ("authority =" + url. getAuthority ());
System. out. println ("host =" + url. getHost ());
System. out. println ("port =" + url. getPort ());
System. out. println ("path =" + url. getPath ());
System. out. println ("query =" + url. getQuery ());
System. out. println ("filename =" + url. getFile ());
System. out. println ("ref =" + url. getRef ());
} Catch (MalformedURLException e ){
// TODO Auto-generated catch block
E. printStackTrace ();
}
}
}
Package net. csdn. web;
Import java.net. MalformedURLException;
Import java.net. URL;
Public class UrlDemo {
/**
* @ Param args
*/
Public static void main (String [] args ){
// TODO Auto-generated method stub
Try {
URL url = new URL ("http://dianying.taobao.com /? Spm = 1.1000386.221827.9 ");
System. out. println ("protocol =" + url. getProtocol ());
System. out. println ("authority =" + url. getAuthority ());
System. out. println ("host =" + url. getHost ());
System. out. println ("port =" + url. getPort ());
System. out. println ("path =" + url. getPath ());
System. out. println ("query =" + url. getQuery ());
System. out. println ("filename =" + url. getFile ());
System. out. println ("ref =" + url. getRef ());
} Catch (MalformedURLException e ){
// TODO Auto-generated catch block
E. printStackTrace ();
}
}
}
Download webpage information through URL
[Java]
Package net. csdn. web;
Import java. io. BufferedReader;
Import java. io. FileOutputStream;
Import java. io. IOException;
Import java. io. InputStreamReader;
Import java.net. URL;
Public class TestNet3 {
Public static void main (String [] args) throws IOException {
URL url = new URL ("http://www.baidu.com /");
InputStreamReader isr = new InputStreamReader (url. openStream ());
BufferedReader in = new BufferedReader (isr );
String inputLine;
FileOutputStream fos = new FileOutputStream ("d: \ abc.html ");
While (inputLine = in. readLine ())! = Null ){
Fos. write (inputLine. getBytes ());
System. out. println (inputLine );
}
In. close ();
}
}
Package net. csdn. web;
Import java. io. BufferedReader;
Import java. io. FileOutputStream;
Import java. io. IOException;
Import java. io. InputStreamReader;
Import java.net. URL;
Public class TestNet3 {
Public static void main (String [] args) throws IOException {
URL url = new URL ("http://www.baidu.com /");
InputStreamReader isr = new InputStreamReader (url. openStream ());
BufferedReader in = new BufferedReader (isr );
String inputLine;
FileOutputStream fos = new FileOutputStream ("d: \ abc.html ");
While (inputLine = in. readLine ())! = Null ){
Fos. write (inputLine. getBytes ());
System. out. println (inputLine );
}
In. close ();
}
}
The garbled characters in the java address bar are converted to common characters:
The URLDecoder class has a static method of decode (String s, String enc): Convert garbled special characters into common characters.
The URLEncoder class has a static method of encode (String s, String enc): Convert common characters into special characters with garbled characters.
[Java]
Package net. csdn. web;
Import java. io. UnsupportedEncodingException;
Import java.net. URLDecoder;
Import java.net. URLEncoder;
Public class TestNet4 {
/**
* @ Param args
*/
Public static void main (String [] args ){
Try {
String str1 = URLEncoder. encode ("java program development", "UTF-8 ");
System. out. println (str1 );
String str2 = URLDecoder. decode ("java % E7 % A8 % 8B % E5 % BA % 8F % E5 % BC % 80% E5 % 8F % 91", "UTF-8 ");
System. out. println (str2 );
} Catch (UnsupportedEncodingException e ){
// TODO Auto-generated catch block
E. printStackTrace ();
}
}
}
Package net. csdn. web;
Import java. io. UnsupportedEncodingException;
Import java.net. URLDecoder;
Import java.net. URLEncoder;
Public class TestNet4 {
/**
* @ Param args
*/
Public static void main (String [] args ){
Try {
String str1 = URLEncoder. encode ("java program development", "UTF-8 ");
System. out. println (str1 );
String str2 = URLDecoder. decode ("java % E7 % A8 % 8B % E5 % BA % 8F % E5 % BC % 80% E5 % 8F % 91", "UTF-8 ");
System. out. println (str2 );
} Catch (UnsupportedEncodingException e ){
// TODO Auto-generated catch block
E. printStackTrace ();
}
}
}