Java 的 Cookie 处理类，javacookie处理类,import java.

Java 的 Cookie 处理类，javacookie处理类,import java.

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.com";    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()))              &amp;&amp; (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();  }}