利用java.HttpURLConnect 保持与网站的会话方法

URL url = null;

HttpURLConnection con = null;

try {

url = new URL("http://www.cpi.net.cn/");

con = (HttpURLConnection) url.openConnection();

con.connect();

int responseCode = con.getResponseCode();

Map <String,List<String>> map = con.getHeaderFields();//此时拿到了头信息，放到了map中

List<String> cookie= map.get("Set-Cookie");//获取头信息中的 Set-cookie 信息

Map<String, String> resmap = new HashMap<String, String>();

if (cookie != null) {

StringBuffer sb = new StringBuffer();

boolean isLast = false;

int i = 0;

for (String val : cookie) {

i++;

if (i == cookie.size()) {

isLast = true;

}

int pos = val.indexOf("=");

if (pos != -1) {

String cookieName = val.substring(0, pos);

String cookieVal = val.substring(pos + 1);

System.out.println(cookieName+":"+cookieVal);

cookieVal = cookieVal.split(";")[0];

if (isLast) {

sb.append(cookieName + "=" + cookieVal);

} else {

sb.append(cookieName + "=" + cookieVal + ";");

}

}

}System.out.println(sb.toString());

resmap.put("Cookie", sb.toString());//存储 Cookie-CookieValue 的 key-value 对象

 

//若下次再发送请求 可将上面拿到的cookie信息放到请求的参数中

con.setRequestProperty("Cookie", resmap.get("Cookie"));

//下面再进行操作即可保持此会话

}

} catch (MalformedURLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

finally{

if(con!=null)

con.disconnect();

}