Apache Httpclient 简明教程
Apache HttpClient - Cookies Management
Cookie 是存储在客户端计算机上的文本文件，它们被用于各种信息跟踪目的。
HttpClient 为 cookie 提供支持，您可以创建和管理 cookie。
Creating a cookie
按照下面给出的步骤使用 HttpClient 库创建 cookie。
Step 1 - Create Cookiestore object
CookieStore 接口表示 Cookie 对象的抽象存储。您可以通过实例化 BasicCookieStore 类来创建 cookie 存储，该类是此接口的默认实现。
//Creating the CookieStore object
CookieStore cookieStore = new BasicCookieStore();Step 2 - Create ClientCookie object
除了 cookie 的功能之外，ClientCookie 还可以获取服务器中的原始 cookie。您可以通过实例化 BasicClientCookie 类来创建客户端 cookie。对于此类的构造函数，您需要传递您希望存储在特定 cookie 中的键值对。
//Creating client cookie
BasicClientCookie clientCookie = new BasicClientCookie("name","Raju");Step 3 - Set values to the cookie
对于客户端 cookie，可以使用相应的函数来设置/移除路径、值、版本、到期日期、域名、注释和属性。
Calendar myCal = new GregorianCalendar(2018, 9, 26);
Date expiryDate = myCal.getTime();
clientcookie.setExpiryDate(expiryDate);
clientcookie.setPath("/");
clientcookie.setSecure(true);
clientcookie.setValue("25");
clientcookie.setVersion(5);Example
以下示例演示如何创建 cookie 并将其添加到 cookie 存储中。在此，我们创建了一个 cookie 存储，通过设置域名和路径值创建了一组 cookie，并将这些 cookie 添加到 cookie 存储中。
import org.apache.http.client.CookieStore;
import org.apache.http.impl.client.BasicCookieStore;
import org.apache.http.impl.cookie.BasicClientCookie;
public class CookieHandlingExample {
public static void main(String args[]) throws Exception{
//Creating the CookieStore object
CookieStore cookiestore = new BasicCookieStore();
//Creating client cookies
BasicClientCookie clientcookie1 = new BasicClientCookie("name","Raju");
BasicClientCookie clientcookie2 = new BasicClientCookie("age","28");
BasicClientCookie clientcookie3 = new BasicClientCookie("place","Hyderabad");
//Setting domains and paths to the created cookies
clientcookie1.setDomain(".sample.com");
clientcookie2.setDomain(".sample.com");
clientcookie3.setDomain(".sample.com");
clientcookie1.setPath("/");
clientcookie2.setPath("/");
clientcookie3.setPath("/");
//Adding the created cookies to cookie store
cookiestore.addCookie(clientcookie1);
cookiestore.addCookie(clientcookie2);
cookiestore.addCookie(clientcookie3);
}
}Retrieving a cookie
您可以使用 asicCookieStore 类的 getCookies() 方法获取添加到 cookie 存储中的 cookie。此方法返回包含 cookie 存储中所有 cookie 的列表。
您可以使用迭代器打印 cookie 存储的內容，如下所示：
//Retrieving the cookies
List list = cookieStore.getCookies();
//Creating an iterator to the obtained list
Iterator it = list.iterator();
while(it.hasNext()) {
System.out.println(it.next());
}Example
以下示例演示如何从 cookie 存储中检索 cookie。这里，我们向 cookie 存储中添加了一组 cookie，然后将它们取回。
import org.apache.http.client.CookieStore;
import org.apache.http.impl.client.BasicCookieStore;
import org.apache.http.impl.cookie.BasicClientCookie;
public class CookieHandlingExample {
public static void main(String args[]) throws Exception{
//Creating the CookieStore object
CookieStore cookiestore = new BasicCookieStore();
//Creating client cookies
BasicClientCookie clientcookie1 = new BasicClientCookie("name","Raju");
BasicClientCookie clientcookie2 = new BasicClientCookie("age","28");
BasicClientCookie clientcookie3 = new BasicClientCookie("place","Hyderabad");
//Setting domains and paths to the created cookies
clientcookie1.setDomain(".sample.com");
clientcookie2.setDomain(".sample.com");
clientcookie3.setDomain(".sample.com");
clientcookie1.setPath("/");
clientcookie2.setPath("/");
clientcookie3.setPath("/");
//Adding the created cookies to cookie store
cookiestore.addCookie(clientcookie1);
cookiestore.addCookie(clientcookie2);
cookiestore.addCookie(clientcookie3);
}
}