Http请求保存用户的的登录状态

今天是关于怎么处理，用户登录之后，怎么保持登录状态。

HTTP 用户登录的过程

A 客户登录之，Web服务器会给该客服端产生一个SessionID

B SessionID 会随着服务器的响应结果一并返回来

C 客服端获取服务器返回来的SessionID

D 向服务器发送其他请求，要把SessionID传给服务器，服务器会去匹配该SessionID是否存在，如果存在就是登录，如果不存在，则是未登录

1 如何获取Web服务器返回来的SessionID

 

/** * 获取WeB服务器Sessionid */public static void getSessionID(HttpUtils http) {DefaultHttpClient defa = (DefaultHttpClient) http.getHttpClient();CookieStore cookie = (CookieStore) defa.getCookieStore();List<Cookie> list = cookie.getCookies();for (int i = 0; i < list.size(); i++) {String name = list.get(i).getName();//得到Sessionid  Key值if (name.equals("JESSIONID")) {SessionClass.SessionID = list.get(i).getValue();//得到Sessionid  value值Log.i("Sessionid", SessionClass.SessionID);break;}}}

2 把获取到的Sessionid 存起来

/** * SessionID存起来 *  * @param context * @param sessionid * @param http */private static void setCookie(Context context) {if (context != null) {if (!TextUtils.isEmpty(SessionClass.SessionID)) {BasicClientCookie cookie = new BasicClientCookie("JESSIONID",SessionClass.SessionID);cookie.setVersion(0);cookie.setDomain("tr.zzapi.gson.cn");cookie.setPath("/");BasicCookieStore cook = new BasicCookieStore();cook.addCookie(cookie);http.configCookieStore(cook);}}}

3 请求是带上Sessionid

 HttpUtils http = SessionClass.getHttp(SessionID_main.this);

步骤   先获得SessionID      然后 存到 本地     最后 请求带上 本地的SessionID

完整的例子

package com.xcl.android;import java.util.List;import org.apache.http.client.CookieStore;import org.apache.http.cookie.Cookie;import org.apache.http.cookie.SetCookie;import org.apache.http.impl.client.BasicCookieStore;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.impl.cookie.BasicClientCookie;import android.content.Context;import android.text.TextUtils;import android.util.Log;import com.lidroid.xutils.HttpUtils;public class SessionClass {private static HttpUtils http = new HttpUtils();private static String SessionID;/** * 单利模式 只创立一次 这个必须要 *  * @param context * @return */public static HttpUtils getHttp(Context context) {if (http == null) {http = new HttpUtils();}setCookie(context);return http;}/** * 获取WeB服务器Sessionid */public static void getSessionID(HttpUtils http) {DefaultHttpClient defa = (DefaultHttpClient) http.getHttpClient();CookieStore cookie = (CookieStore) defa.getCookieStore();List<Cookie> list = cookie.getCookies();for (int i = 0; i < list.size(); i++) {String name = list.get(i).getName();//得到Sessionid  Key值if (name.equals("JESSIONID")) {SessionClass.SessionID = list.get(i).getValue();//得到Sessionid  value值Log.i("Sessionid", SessionClass.SessionID);break;}}}/** * SessionID存起来 *  * @param context * @param sessionid * @param http */private static void setCookie(Context context) {if (context != null) {if (!TextUtils.isEmpty(SessionClass.SessionID)) {BasicClientCookie cookie = new BasicClientCookie("JESSIONID",SessionClass.SessionID);cookie.setVersion(0);cookie.setDomain("tr.zzapi.gson.cn");cookie.setPath("/");BasicCookieStore cook = new BasicCookieStore();cook.addCookie(cookie);http.configCookieStore(cook);}}}}

package com.xcl.android;import java.util.List;import org.apache.http.client.CookieStore;import org.apache.http.cookie.Cookie;import org.apache.http.impl.client.BasicCookieStore;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.impl.cookie.BasicClientCookie;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.text.TextUtils;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;import com.example.sessionid.R;import com.lidroid.xutils.HttpUtils;import com.lidroid.xutils.exception.HttpException;import com.lidroid.xutils.http.RequestParams;import com.lidroid.xutils.http.ResponseInfo;import com.lidroid.xutils.http.callback.RequestCallBack;import com.lidroid.xutils.http.client.HttpRequest.HttpMethod;public class SessionID_main extends Activity {private TextView sessionID;private Button button;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.sessionid);sessionID = (TextView) findViewById(R.id.text);button = (Button) findViewById(R.id.button);button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubfinal HttpUtils http = SessionClass.getHttp(SessionID_main.this);RequestParams params = new RequestParams();params.addBodyParameter("userName", "李四");params.addBodyParameter("password", "q");http.send(HttpMethod.POST,"http://tr.zzapi.gson.cn/api/user/login", params,new RequestCallBack<String>() {@Overridepublic void onFailure(HttpException arg0,String arg1) {// TODO Auto-generated method stub}@Overridepublic void onSuccess(ResponseInfo<String> arg0) {// TODO Auto-generated method stubSessionClass.getSessionID(http);}});}});}}