Download WWW Page : Socket « Network Protocol « Java

1. Java
2. Network Protocol
3. Socket

Download WWW Page

    
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.InetAddress;
import java.net.Socket;
import java.net.URL;
import java.net.UnknownHostException;

class Main{
  public String downloadWWWPage(URL pageURL) throws Exception {
    String host, file;
    host = pageURL.getHost();
    file = pageURL.getFile();

    InputStream pageStream = getWWWPageStream(host, file);
    if (pageStream == null) {
      return "";
    }

    DataInputStream in = new DataInputStream(pageStream);
    StringBuffer pageBuffer = new StringBuffer();
    String line;

    while ((line = in.readUTF()) != null) {
      pageBuffer.append(line);
    }
    in.close();
    return pageBuffer.toString();
  }

  public InputStream getWWWPageStream(String host, String file) throws IOException,
      UnknownHostException {
     
    InetAddress webServer = InetAddress.getByName(host);

    Socket httpPipe = new Socket(webServer, 80);
    if (httpPipe == null) {
      System.out.println("Socket to Web server creation failed.");
      return null;
    }

    InputStream inn = httpPipe.getInputStream(); // get raw streams
    OutputStream outt = httpPipe.getOutputStream();

    DataInputStream in = new DataInputStream(inn); // turn into higher-level ones
    PrintStream out = new PrintStream(outt);

    if (inn == null || outt == null) {
      System.out.println("Failed to open streams to socket.");
      return null;
    }
    out.println("GET " + file + " HTTP/1.0\n");

    String response;
    while ((response = in.readUTF()).length() > 0) {
      System.out.println(response);
    }

    return in;
  }
}

   
    
    
    
  

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