java访问webservce,保持会话,服务端保存session验证

在进行程序开发的过程中,遇到一个问题,怎么保持会话。

因为一帮进行方法调用很少涉及到即时身份验证的。

例如:

1:客户端登录后服务端保存登录用户信息;

2:客户端持有验证通过key再次请求;

3:服务端得到key对比session存储key进行身份验证。

问题来了,请求服务,请求完成后,为了节约服务器资源,会断开连接,服务端如何识别是哪次请求的session呢?

这个时候就需要在第一次请求时,服务端返回sessionkey ,客户端再次请求时再请求头部使用此sessionkey表面身份,

在java端的方法如下:

public class WSHelper implements Runnable {
private static ExecutorService pool = Executors.newSingleThreadExecutor(); private static final String TAG = "WSHelper"; // 设置webservices的超时时长
private static final int ACCESS_TIMEOUT = 15000; private static String sessionId ; private WSParams mPs;
private WSCallBack mCallback; public static void setSessionId(String id){
sessionId = id;
} private WSHelper( WSParams ps , WSCallBack callback){
mPs = ps;
mCallback = callback;
}
//namespace:命名空间(http://www.ulife.com.cn/)
//methodName:方法名称
//url:服务调用地址(http://192.168.0.250/WebService/UHomeStationService.asmx)
//params:参数 public static Object callWebService(String nameSpace, String methodName, String url, Map<String, Object> params) {
final String soapAction = nameSpace + methodName;

        Log.e(TAG, "#开始调用WebServices → nameSpace= " + nameSpace + "; methodName= " + methodName
+ " url= " + url + "; sessionId="+ sessionId +"; params= " + params); // 1.创建数据对象 参数1:webServices命名空间 2:要访问的WebServices名称
SoapObject request = new SoapObject(nameSpace, methodName); // 2.创建信封对象
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet = true; // .net 支持
envelope.bodyOut = request; // 添加输出参数 // 添加要传递的websercice的参数
if (params != null && !params.isEmpty()) {
for (Iterator<Entry<String, Object>> it = params.entrySet().iterator(); it.hasNext();) {
Map.Entry<String, Object> e = it.next();
request.addProperty(e.getKey(), e.getValue());
}
} // 3.创建运输机对象对象
HttpTransportSE httpTransportSE = new HttpTransportSE( url , ACCESS_TIMEOUT );
httpTransportSE.debug = true;
Object object = null;
try {
List<HeaderProperty> headers = null;
if ( sessionId != null ){
headers = new ArrayList<HeaderProperty>();
headers.add(new HeaderProperty("Cookie" , "ASP.NET_SessionId=" + sessionId));
}
// 4.开始请求WebServices 参数1为 Action地址 (命名空间 + WebServices名称) 参数2为 信封对象
httpTransportSE.call(soapAction, envelope , headers);       // 5 .获得WebServices返回数据
object = envelope.getResponse();
} catch (Exception e) {
e.printStackTrace();
}
Log.e(TAG, "###WebServices → result = " + object);
return object;
} public static void callWS( WSParams ps , WSCallBack callback){
new Thread(new WSHelper(ps , callback)).start();
} public static void callWSSingleThread( WSParams ps , WSCallBack callback){
pool.execute(new WSHelper(ps , callback));
} public static boolean checkNetAndCallWS(Context context, WSParams ps, WSCallBack callback){
if ( NetUtil.checkNetwork(context)){
new Thread(new WSHelper(ps , callback)).start();
} else {
Toast.makeText(context, R.string.wang_luo_bu_ke_yong, Toast.LENGTH_SHORT).show();
return false;
}
return true;
} public static class WSParams {
public WSParams(String nameSpace, String methodName, String url, Map<String, Object> params){
this.nameSpace = nameSpace;
this.methodName = methodName;
this.url = url;
this.params = params;
} public String nameSpace;
public String methodName;
public String url;
public Map<String, Object> params;
} public interface WSCallBack{
void callBack(Object obj);
} @Override
public void run() {
try {
Object obj = callWebService(mPs.nameSpace , mPs.methodName , mPs.url , mPs.params);
if ( mCallback != null )
mCallback.callBack(obj);
} catch (Exception e) {
Log.e(TAG, "callback error!", e);
}
} public static String filterValue(Object value){
String str = null;
if ( value != null ){
str = value.toString();
if ( "".equals(str) || "anyType{}".equals( str ) )
str = null ;
}
return str;
}
}
上一篇:运行sql server profiler所需的权限


下一篇:java 内部类(inner class)详解