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Java CookieStore 类使用示例

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CookieStore是JavaAPI中用来处理HTTP客户端的Cookie存储策略的类。```java 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; } }

cookieTest.jsp ```java
<%
    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>

标签:java

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