Java Tutorial/Network/Cookie

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CookieStore

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.CookieHandler;
import java.net.CookieManager;
import java.net.CookiePolicy;
import java.net.CookieStore;
import java.net.HttpCookie;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class WebClient {
  public static void main(String[] args) throws Exception {
    CookieStore store = new MyCookieStore();
    CookiePolicy policy = new MyCookiePolicy();
    CookieManager handler = new CookieManager(store, policy);
    CookieHandler.setDefault(handler);
    URL url = new URL("http://localhost:8080/cookieTest.jsp");
    URLConnection conn = url.openConnection();
    InputStream in = conn.getInputStream();
    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
    String input;
    while ((input = reader.readLine()) != null) {
      System.out.println(input);
    }
    reader.close();
  }
}
class MyCookiePolicy implements CookiePolicy {
  public boolean shouldAccept(URI uri, HttpCookie cookie) {
//    String host = uri.getHost();
  //  return host.equals("localhost");
    return true;
  }
}
class MyCookieStore implements CookieStore {
  private Map<URI, List<HttpCookie>> map = new HashMap<URI, List<HttpCookie>>();
  public void add(URI uri, HttpCookie cookie) {
    List<HttpCookie> cookies = map.get(uri);
    if (cookies == null) {
      cookies = new ArrayList<HttpCookie>();
      map.put(uri, cookies);
    }
    cookies.add(cookie);
  }
  public List<HttpCookie> get(URI uri) {
    List<HttpCookie> cookies = map.get(uri);
    if (cookies == null) {
      cookies = new ArrayList<HttpCookie>();
      map.put(uri, cookies);
    }
    return cookies;
  }
  public List<HttpCookie> getCookies() {
    Collection<List<HttpCookie>> values = map.values();
    List<HttpCookie> result = new ArrayList<HttpCookie>();
    for (List<HttpCookie> value : values) {
      result.addAll(value);
    }
    return result;
  }
  public List<URI> getURIs() {
    Set<URI> keys = map.keySet();
    return new ArrayList<URI>(keys);
  }
  public boolean remove(URI uri, HttpCookie cookie) {
    List<HttpCookie> cookies = map.get(uri);
    if (cookies == null) {
      return false;
    }
    return cookies.remove(cookie);
  }
  public boolean removeAll() {
    map.clear();
    return true;
  }
}

The cookieTest.jsp page

<%
    Cookie cookie = new Cookie ("username", "guest");
    cookie.setMaxAge (100);
    response.addCookie (cookie);
%>
<html>
<head>
<title>HttpCookie Demo</title>
</head>
<body>
Add cookie. Cookie name = <%=cookie.getName () +". Cookie value = " + cookie.getValue () %>
</body>
</html>

//Reference:
//Java 6 New Features: A Tutorial
//by Budi Kurniawan 
//Brainy Software Corp. 2006
//Chapter 4 - Networking
//# ISBN-10: 0975212885
//# ISBN-13: 978-0975212882





Fetch Cookie with CookieHandler, CookieManager and CookieStore

import java.net.CookieHandler;
import java.net.CookieManager;
import java.net.CookieStore;
import java.net.HttpCookie;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
public class FetchCookie {
  public static void main(String args[]) throws Exception {
    String urlString = "http://java.sun.ru";
    CookieManager manager = new CookieManager();
    CookieHandler.setDefault(manager);
    URL url = new URL(urlString);
    URLConnection connection = url.openConnection();
    Object obj = connection.getContent();
    url = new URL(urlString);
    connection = url.openConnection();
    obj = connection.getContent();
    CookieStore cookieJar = manager.getCookieStore();
    List<HttpCookie> cookies = cookieJar.getCookies();
    for (HttpCookie cookie : cookies) {
      System.out.println(cookie);
    }
  }
}





Using CookieHandler in Java 5

#Code referenced from 
#Chapter 6 - Extensible Markup Language (XML)
#Java 6 Platform Revealed
#by John Zukowski 
#ISBN: 1590596609
#http://www.apress.ru/book/bookDisplay.html?bID=10109
import java.io.IOException;
import java.net.CookieHandler;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
public class Fetch5 {
  public static void main(String args[]) throws Exception {
    String urlString = "java.sun.ru";
    CookieHandler.setDefault(new ListCookieHandler());
    URL url = new URL(urlString);
    URLConnection connection = url.openConnection();
    Object obj = connection.getContent();
    url = new URL(urlString);
    connection = url.openConnection();
    obj = connection.getContent();
  }
}
class ListCookieHandler extends CookieHandler {
  private List<Cookie> cookieJar = new LinkedList<Cookie>();
  public void put(URI uri, Map<String, List<String>> responseHeaders) throws IOException {
    List<String> setCookieList = responseHeaders.get("Set-Cookie");
    if (setCookieList != null) {
      for (String item : setCookieList) {
        Cookie cookie = new Cookie(uri, item);
        for (Cookie existingCookie : cookieJar) {
          if ((cookie.getURI().equals(existingCookie.getURI()))
              && (cookie.getName().equals(existingCookie.getName()))) {
            cookieJar.remove(existingCookie);
            break;
          }
        }
        cookieJar.add(cookie);
      }
    }
  }
  public Map<String, List<String>> get(URI uri, Map<String, List<String>> requestHeaders)
      throws IOException {
    StringBuilder cookies = new StringBuilder();
    for (Cookie cookie : cookieJar) {
      // Remove cookies that have expired
      if (cookie.hasExpired()) {
        cookieJar.remove(cookie);
      } else if (cookie.matches(uri)) {
        if (cookies.length() > 0) {
          cookies.append(", ");
        }
        cookies.append(cookie.toString());
      }
    }
    Map<String, List<String>> cookieMap = new HashMap<String, List<String>>(requestHeaders);
    if (cookies.length() > 0) {
      List<String> list = Collections.singletonList(cookies.toString());
      cookieMap.put("Cookie", list);
    }
    System.out.println("CookieMap: " + cookieMap);
    return Collections.unmodifiableMap(cookieMap);
  }
}
class Cookie {
  String name;
  String value;
  URI uri;
  String domain;
  Date expires;
  String path;
  private static DateFormat expiresFormat1 = new SimpleDateFormat("E, dd MMM yyyy k:m:s "GMT"",
      Locale.US);
  private static DateFormat expiresFormat2 = new SimpleDateFormat("E, dd-MMM-yyyy k:m:s "GMT"",
      Locale.US);
  public Cookie(URI uri, String header) {
    String attributes[] = header.split(";");
    String nameValue = attributes[0].trim();
    this.uri = uri;
    this.name = nameValue.substring(0, nameValue.indexOf("="));
    this.value = nameValue.substring(nameValue.indexOf("=") + 1);
    this.path = "/";
    this.domain = uri.getHost();
    for (int i = 1; i < attributes.length; i++) {
      nameValue = attributes[i].trim();
      int equals = nameValue.indexOf("=");
      if (equals == -1) {
        continue;
      }
      String name = nameValue.substring(0, equals);
      String value = nameValue.substring(equals + 1);
      if (name.equalsIgnoreCase("domain")) {
        String uriDomain = uri.getHost();
        if (uriDomain.equals(value)) {
          this.domain = value;
        } else {
          if (!value.startsWith(".")) {
            value = "." + value;
          }
          uriDomain = uriDomain.substring(uriDomain.indexOf("."));
          if (!uriDomain.equals(value)) {
            throw new IllegalArgumentException("Trying to set foreign cookie");
          }
          this.domain = value;
        }
      } else if (name.equalsIgnoreCase("path")) {
        this.path = value;
      } else if (name.equalsIgnoreCase("expires")) {
        try {
          this.expires = expiresFormat1.parse(value);
        } catch (ParseException e) {
          try {
            this.expires = expiresFormat2.parse(value);
          } catch (ParseException e2) {
            throw new IllegalArgumentException("Bad date format in header: " + value);
          }
        }
      }
    }
  }
  public boolean hasExpired() {
    if (expires == null) {
      return false;
    }
    Date now = new Date();
    return now.after(expires);
  }
  public String getName() {
    return name;
  }
  public URI getURI() {
    return uri;
  }
  public boolean matches(URI uri) {
    if (hasExpired()) {
      return false;
    }
    String path = uri.getPath();
    if (path == null) {
      path = "/";
    }
    return path.startsWith(this.path);
  }
  public String toString() {
    StringBuilder result = new StringBuilder(name);
    result.append("=");
    result.append(value);
    return result.toString();
  }
}


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