Java by API/java.net/HttpURLConnection

HttpsURLConnection: getDefaultSSLSocketFactory()

  

import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.security.cert.CertPath;
import java.security.cert.CertificateFactory;
import java.util.ArrayList;
import java.util.List;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
public class Main {
  public static void main(String args[]) throws Exception {
    SSLSocketFactory factory = HttpsURLConnection.getDefaultSSLSocketFactory();
    SSLSocket socket = (SSLSocket) factory.createSocket("127.0.0.1", 9999);
    socket.startHandshake();
    SSLSession session = socket.getSession();
    java.security.cert.Certificate[] servercerts = session.getPeerCertificates();
    List mylist = new ArrayList();
    for (int i = 0; i < servercerts.length; i++) {
      mylist.add(servercerts[i]);
    }
    CertificateFactory cf = CertificateFactory.getInstance("X.509");
    CertPath cp = cf.generateCertPath(mylist);
    FileOutputStream f = new FileOutputStream("CertPath.dat");
    ObjectOutputStream b = new ObjectOutputStream(f);
    b.writeObject(cp);
  }
}

HttpURLConnection: getContentLength()

  
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;
public class Main{
  public static void main(String args[]) throws Exception {
    URL url = new URL("http://www.google.ru");
    HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();

    int len = httpCon.getContentLength();
    if (len == -1)
      System.out.println("Content length unavailable.");
    else
      System.out.println("Content-Length: " + len);
 }
}

HttpURLConnection: getContentType()

  
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;
public class Main{
  public static void main(String args[]) throws Exception {
    URL url = new URL("http://www.google.ru");
    HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();

    System.out.println("Content-Type: " + httpCon.getContentType());
 }
}

HttpURLConnection: getDate()

  

import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;
public class Main{
  public static void main(String args[]) throws Exception {
    URL url = new URL("http://www.google.ru");
    HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
    long date = httpCon.getDate();
    if (date == 0)
      System.out.println("No date information.");
    else
      System.out.println("Date: " + new Date(date));
 }
}

HttpURLConnection: getExpiration()

  

import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;
public class Main{
  public static void main(String args[]) throws Exception {
    URL url = new URL("http://www.google.ru");
    HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
    long date = httpCon.getExpiration();
    if (date == 0)
      System.out.println("No expiration information.");
    else
      System.out.println("Expires: " + new Date(date));
 }
}

HttpURLConnection: getHeaderFields()

  

import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class Main{
  public static void main(String args[]) throws Exception {
    URL url = new URL("http://www.google.ru");
    HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
    Map<String, List<String>> hdrs = httpCon.getHeaderFields();
    Set<String> hdrKeys = hdrs.keySet();
    for (String k : hdrKeys)
      System.out.println("Key: " + k + "  Value: " + hdrs.get(k));
 }
}

HttpURLConnection: getInputStream()

  

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class Main {
  public static void main(String args[]) throws Exception {
    URL url = new URL("http://www.google.ru");
    HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
    InputStream inStrm = httpCon.getInputStream();
    System.out.println("\nContent at " + url);
    int ch;
    while (((ch = inStrm.read()) != -1))
      System.out.print((char) ch);
    inStrm.close();
  }
}

HttpURLConnection: getLastModified()

  

import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;
public class Main{
  public static void main(String args[]) throws Exception {
    URL url = new URL("http://www.google.ru");
    HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
    long date = httpCon.getLastModified();
    if (date == 0)
      System.out.println("No last-modified information.");
    else
      System.out.println("Last-Modified: " + new Date(date));
 }
}

HttpURLConnection: getRequestMethod

  
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;
public class Main{
  public static void main(String args[]) throws Exception {
    URL url = new URL("http://www.google.ru");
    HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
    System.out.println("Request method is " + httpCon.getRequestMethod());
 }
}

HttpURLConnection: getResponseCode()

  
 import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;
public class BasicAuthNeeded {
  public static void main(String[] args) throws Exception {
    String s;
    s = "http://www.y.ru/authTest";
    URL url = new URL(s);
    URLConnection urlc = url.openConnection();
    Map<String, List<String>> hf = urlc.getHeaderFields();
    for (String key : hf.keySet())
      System.out.println(key + ": " + urlc.getHeaderField(key));
    System.out.println(((HttpURLConnection) urlc).getResponseCode());
  }
}

HttpURLConnection: getResponseMessage()

  

import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;
public class Main{
  public static void main(String args[]) throws Exception {
    URL url = new URL("http://www.google.ru");
    HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
    System.out.println("Response Message is " + httpCon.getResponseMessage());
 }
}

HttpURLConnection.HTTP_OK

  

import java.net.HttpURLConnection;
import java.net.URL;
public class Main {
  public static void main(String[] argv) throws Exception {
    HttpURLConnection.setFollowRedirects(false);
    HttpURLConnection con = (HttpURLConnection) new URL("http://www.google.coom").openConnection();
    con.setRequestMethod("HEAD");
    System.out.println(con.getResponseCode() == HttpURLConnection.HTTP_OK);
  }
}

HttpURLConnection: setInstanceFollowRedirects(boolean followRedirects)

  

import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
public class Main {
  public static void main(String[] argv) throws Exception {
    HttpURLConnection.setFollowRedirects(false);
    URL url = new URL("http://hostname:80");
    URLConnection conn = url.openConnection();
    HttpURLConnection httpConn = (HttpURLConnection) conn;
    httpConn.setInstanceFollowRedirects(false);
    conn.connect();
  }
}

HttpURLConnection: setRequestMethod(String method) throws ProtocolException

  
import java.net.HttpURLConnection;
import java.net.URL;
public class Main {
  public static void main(String[] argv) throws Exception {
    HttpURLConnection.setFollowRedirects(false);
    HttpURLConnection con = (HttpURLConnection) new URL("http://www.google.coom").openConnection();
    con.setRequestMethod("HEAD");
    System.out.println(con.getResponseCode() == HttpURLConnection.HTTP_OK);
  }
}