//获取服务端的这个sessionid的名称

/* 获取cookieStore */ 
List<Cookie> cookies = cookieStore.getCookies(); 
for(int i=0;i<cookies.size();i++){ 
  String sessionid = cookies.get(i).getName(); 从这里可以获取到这个sessionid，即为 ASP.NET_SessionId

}

for(int i=0;i<cookies.size();i++){

if("ASP.NET_SessionId".equals(cookies.get(i).getName())){ 
　　JSESSIONID = cookies.get(i).getValue(); //这个即为sessionid的值
　　break; 
}

}

public static DefaultHttpClient httpClient = null;

 private static String JSESSIONID; //定义一个静态的字段，保存sessionID 

 public static String getRequest(String url)

 {

 httpClient = new DefaultHttpClient();

 HttpGet get = new HttpGet(url);

 try

 {

 HttpParams params = new BasicHttpParams();

  HttpConnectionParams.setConnectionTimeout(params, 10000);//设置连接超时

  HttpConnectionParams.setSoTimeout(params, 15000);//设置请求超时

  get.setParams(params);

  get.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8");

  if(null != JSESSIONID){ 

  get.setHeader("Cookie", "ASP.NET_SessionId="+JSESSIONID); 

  }

  //连接响应，通过HttpResponse获得响应信息

 HttpResponse httpResponse = httpClient.execute(get);

 if(httpResponse.getStatusLine().getStatusCode() == 200)

 {

 //取得响应字符串

 String result = EntityUtils.toString(httpResponse.getEntity());

 return result;

 }

 }

 catch (ClientProtocolException e)

 {

 return null;

 }

 catch (IOException e)

 {

 return null;

 }

 return null;

 }

 

 public static String postRequest(String url, HashMap<String, String> rawParams) throws Exception

 {

 httpClient = new DefaultHttpClient();

 //创建POST请求方式

 HttpPost post = new HttpPost(url);

 

 HttpParams cparams = new BasicHttpParams();

 

 HttpConnectionParams.setConnectionTimeout(cparams, 10000);//设置连接超时

 HttpConnectionParams.setSoTimeout(cparams, 15000);//设置请求超时

 post.setParams(cparams);

 post.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8");

 if(null != JSESSIONID){ 

 post.setHeader("Cookie", "ASP.NET_SessionId="+JSESSIONID); 

  }

 //使用NameValuePair来保存要传递的参数,可以使用BasicNameValuePair来构造一个要被传递的参数

 //通过add添加这个参数到NameValuePair中

 ArrayList<NameValuePair> params = new ArrayList<NameValuePair>();

 for(String key : rawParams.keySet())

 {

 //添加要传传递的参数

 params.add(new BasicNameValuePair(key, rawParams.get(key)));

 }

 //post需要为参数设置字符集

 HttpEntity httpEntity = new UrlEncodedFormEntity(params, HTTP.UTF_8);

 //请求httpRequest

 post.setEntity(httpEntity);

 //发送POST请求并获取响应

 HttpResponse httpResponse = null;

 try

 {

  httpResponse = httpClient.execute(post);

 }

 catch(Exception ex)

 {

 String ee = ex.getMessage();

 }

 if(httpResponse.getStatusLine().getStatusCode() == 200)

 {

 String result = EntityUtils.toString(httpResponse.getEntity(), HTTP.UTF_8);

 /* 获取cookieStore

　　　　　　　　ASP.NET_SessionId就是通过上面的方法获取到。

　　　　　　*/ 

   CookieStore cookieStore = httpClient.getCookieStore(); 

   List<Cookie> cookies = cookieStore.getCookies();

   for(int i=0;i<cookies.size();i++){ 

    if("ASP.NET_SessionId".equals(cookies.get(i).getName())){ 

     JSESSIONID = cookies.get(i).getValue(); 

     break; 

    } 

   } 

 return result;

 }

 return null;

 }