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| 19. 9. 1. java.net.Socket |
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- A socket is an endpoint of a network connection.
- A socket enables an application to read from and write to the network.
- The Socket class represents a "client" socket.
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A simple HTTP client |
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
public class MainClass {
public static void main(String[] args) {
String host = "www.google.com";
String protocol = "http";
try {
Socket socket = new Socket(protocol + "://" + host, 80);
OutputStream os = socket.getOutputStream();
boolean autoflush = true;
PrintWriter out = new PrintWriter(socket.getOutputStream(), autoflush);
BufferedReader in = new BufferedReader(
new InputStreamReader(socket.getInputStream()));
// send an HTTP request to the web server
out.println("GET / HTTP/1.1");
out.println("Host: " + host + ":80");
out.println("Connection: Close");
out.println();
// read the response
boolean loop = true;
StringBuilder sb = new StringBuilder(8096);
while (loop) {
if (in.ready()) {
int i = 0;
while (i != -1) {
i = in.read();
sb.append((char) i);
}
loop = false;
}
}
// display the response to the out console
System.out.println(sb.toString());
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
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