Android使用Volley保持与服务器的会话

package cn.usmaker.hm.pai.velloy;import com.android.volley.AuthFailureError;import com.android.volley.NetworkResponse;import com.android.volley.ParseError;import com.android.volley.Request;import com.android.volley.Response;import com.android.volley.toolbox.HttpHeaderParser;import org.json.JSONException;import org.json.JSONObject;import java.io.UnsupportedEncodingException;import java.util.HashMap;import java.util.Map;/** * Created by chenzhenyang on 2015/6/21. */public class NormalPostRequest extends Request<JSONObject> {    private Map mMap;    private Map mHeaders = new HashMap(1);    public static String sessionID = null;    private Response.Listener mListener;    public NormalPostRequest(String url, Response.Listener listener, Response.ErrorListener errorListener, Map map) {        super(Request.Method.POST, url, errorListener);        mListener = listener;        mMap = map;    }    //mMap是已经按照前面的方式,设置了参数的实例    @Override    protected Map getParams() throws AuthFailureError {        return mMap;    }    //此处因为response返回值需要json数据,和JsonObjectRequest类一样即可    @Override    protected Response parseNetworkResponse(NetworkResponse response) {        try {            Map headers = response.headers;            String cookie = headers.get("Set-Cookie");            if (cookie != null) {                sessionID = cookie.substring(0, cookie.indexOf(";"));// 获取sessionID            }            String jsonString = new String(response.data, HttpHeaderParser.parseCharset(response.headers));            return Response.success(new JSONObject(jsonString), HttpHeaderParser.parseCacheHeaders(response));        } catch (UnsupportedEncodingException e) {            return Response.error(new ParseError(e));        } catch (JSONException je) {            return Response.error(new ParseError(je));        }    }    @Override    protected void deliverResponse(JSONObject response) {        mListener.onResponse(response);    }    @Override    public Map getHeaders() throws AuthFailureError {        if (sessionID != null) {            mHeaders.put("Cookie", sessionID);        }        return mHeaders;    }    /**     * 清除Session,退出时调用     */    public static void clearSession() {        sessionID = null;    }}
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