Java:使用HttpURLConnection时Cookie丢失

我有这个浏览器类：

public class browser{

    private List<String> cookies;
    private HttpURLConnection conn;
<....>
public String GetPageContent(String url) throws Exception {

        URL obj = new URL(url);
        conn = (HttpURLConnection) obj.openConnection();

        // default is GET
        conn.setRequestMethod("GET");

        conn.setUseCaches(false);

        // act like a browser
        conn.setRequestProperty("User-Agent", USER_AGENT);
        conn.setRequestProperty("Accept",
                "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
        conn.setRequestProperty("Accept-Language",
                "en-GB,en;q=0.8,en-US;q=0.6,ro;q=0.4,fr;q=0.2");
        if (cookies != null) {
            for (String cookie : this.cookies) {
                conn.addRequestProperty("Cookie", cookie.split(";", 1)[0]);
            }
            System.out.println(cookies);
        }
        int responseCode = conn.getResponseCode();
        System.out.println("\nSending 'GET' request to URL : " + url);
        System.out.println("Response Code : " + responseCode);

        BufferedReader in = new BufferedReader(new InputStreamReader(
                conn.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();

        // Get the response cookies
        setCookies(conn.getHeaderFields().get("Set-Cookie"));

        return response.toString();

    }

但当我在我的主程序中执行类似操作时：

users.getList() 

这是同一个包中的另一个类，它从Browser类调用GetPageContent方法。事情变得奇怪：大多数请求没有附加cookie。 该类如下所示：

public class Check_List {
    private HashMap<String, String> dictionar = new HashMap<String, String>();

    public void getList(HashMap dictionar) {
        http_handler webpage = new http_handler();
    try {
            Iterator it = dictionar.entrySet().iterator();
            while (it.hasNext()) {
                Map.Entry pairs = (Map.Entry) it.next();
                System.out.println(pairs.getKey() + " = " + pairs.getValue());
                webpage.GetPageContent("http://example.com/profile.php?id="+pairs.getKey()+"&actionid=15");
                System.out.println("I'am on user: " + pairs.getValue());

公共类检查表{
私有HashMap字典=新HashMap（）；
公共void getList（HashMap字典）{
http_处理程序网页=新的http_处理程序（）；
试一试{
迭代器it=dictionars.entrySet（）.Iterator（）；
while（it.hasNext（））{
Map.Entry pairs=（Map.Entry）it.next（）；
System.out.println（pairs.getKey（）+“=”+pairs.getValue（））；
网页。GetPageContent（“http://example.com/profile.php?id=“+pairs.getKey（）+”&actionid=15”）；
System.out.println（“我在用户上：+pairs.getValue（））；

你为什么要重新发明轮子？如果你需要一个使用Apache commons HTTP的浏览器类，它已经集成了一个工作的cookie管理系统。你能指出你指的是来自Apache的哪些代码吗？Thanks@MikeS_45由于谷歌搜索的结果。

users.getList() 

public class Check_List {
    private HashMap<String, String> dictionar = new HashMap<String, String>();

    public void getList(HashMap dictionar) {
        http_handler webpage = new http_handler();
    try {
            Iterator it = dictionar.entrySet().iterator();
            while (it.hasNext()) {
                Map.Entry pairs = (Map.Entry) it.next();
                System.out.println(pairs.getKey() + " = " + pairs.getValue());
                webpage.GetPageContent("http://example.com/profile.php?id="+pairs.getKey()+"&actionid=15");
                System.out.println("I'am on user: " + pairs.getValue());