HttpClient cokie会话保持

转自：http://stackoverflow.com/questions/874227/answer/submit

public class HTTPHelp{    DefaultHttpClient httpClient = new DefaultHttpClient();    HttpContext localContext = new BasicHttpContext();    private boolean abort;    private String ret;    HttpResponse response = null;    HttpPost httpPost = null;    public HTTPHelp(){    }    public void clearCookies() {    httpClient.getCookieStore().clear();    }    public void abort() {    try {    if(httpClient!=null){    System.out.println("Abort.");    httpPost.abort();    abort = true;    }    } catch (Exception e) {    System.out.println("HTTPHelp : Abort Exception : "+e);    }    }    public String postPage(String url, String data, boolean returnAddr) {    ret = null;    httpClient.getParams().setParameter(ClientPNames.COOKIE_POLICY, CookiePolicy.RFC_2109);    httpPost = new HttpPost(url);    response = null;    StringEntity tmp = null;    httpPost.setHeader("User-Agent", "Mozilla/5.0 (X11; U; Linux " +    "i686; en-US; rv:1.8.1.6) Gecko/20061201 Firefox/2.0.0.6 (Ubuntu-feisty)");    httpPost.setHeader("Accept", "text/html,application/xml," +    "application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5");    httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded");    try {    tmp = new StringEntity(data,"UTF-8");    } catch (UnsupportedEncodingException e) {    System.out.println("HTTPHelp : UnsupportedEncodingException : "+e);    }    httpPost.setEntity(tmp);    try {    response = httpClient.execute(httpPost,localContext);    } catch (ClientProtocolException e) {    System.out.println("HTTPHelp : ClientProtocolException : "+e);    } catch (IOException e) {    System.out.println("HTTPHelp : IOException : "+e);    }                 ret = response.getStatusLine().toString();                return ret;                }}