Android-network communication framework Volley Usage Details

1 Volley sends a get request:

public void getJson() {String url = "http://"+host+":8080/web/json.jsp?username=xjs&password=123456";mQueue.add(new JsonObjectRequest(Method.GET, url, null,new Listener
 
  () {@Overridepublic void onResponse(JSONObject response) {Log.e(TAG, "response : " + response.toString());}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError error) {String err = error.getMessage();Log.e(TAG, "err : " + err);}}));}
 

2 Volley sends a post request:

public void postJson() {String url = "http://"+host+":8080/web/json.jsp";StringRequest postRequest = new StringRequest(Request.Method.POST, url,new Response.Listener
 
  () {@Overridepublic void onResponse(String response) {// responseLog.d("Response", response);}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError error) {// errorLog.d("Error.Response", error.getMessage());}}) {@Overrideprotected Map
  
    getParams() {Map
   
     params = new HashMap
    
     ();params.put("username", "xjs");params.put("password", "123456");return params;}};mQueue.add(postRequest);}
    
   
  
 

3 Volley:

public void getImage() {String imageUrl = "http://"+host+":8080/web/image.jsp";NetworkImageView view = (NetworkImageView) findViewById(R.id.network_image_view);view.setDefaultImageResId(android.R.drawable.ic_menu_rotate); view.setErrorImageResId(android.R.drawable.ic_delete); view.setImageUrl(imageUrl, new ImageLoader(mQueue, new BitmapLruCache(1024 * 4)));}

4 Volley sends an Https request and the source code needs to be modified:

protected HttpURLConnection createConnection(URL url) throws IOException {if (url.toString().toLowerCase(Locale.CHINA).startsWith("https")) {HTTPSTrustManager.allowAllSSL();}return (HttpURLConnection) url.openConnection();}//HTTPSTrustManager.java:public class HTTPSTrustManager implements X509TrustManager {private static TrustManager[] trustManagers;private static final X509Certificate[] _AcceptedIssuers = new X509Certificate[] {};@Overridepublic void checkClientTrusted(java.security.cert.X509Certificate[] x509Certificates, String s)throws java.security.cert.CertificateException {// To change body of implemented methods use File | Settings | File// Templates.}@Overridepublic void checkServerTrusted(java.security.cert.X509Certificate[] x509Certificates, String s)throws java.security.cert.CertificateException {// To change body of implemented methods use File | Settings | File// Templates.}public boolean isClientTrusted(X509Certificate[] chain) {return true;}public boolean isServerTrusted(X509Certificate[] chain) {return true;}@Overridepublic X509Certificate[] getAcceptedIssuers() {return _AcceptedIssuers;}public static void allowAllSSL() {HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {@Overridepublic boolean verify(String arg0, SSLSession arg1) {// TODO Auto-generated method stubreturn true;}});SSLContext context = null;if (trustManagers == null) {trustManagers = new TrustManager[] { new HTTPSTrustManager() };}try {context = SSLContext.getInstance("TLS");context.init(null, trustManagers, new SecureRandom());} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (KeyManagementException e) {e.printStackTrace();}HttpsURLConnection.setDefaultSSLSocketFactory(context.getSocketFactory());}}

5 Volley needs to modify the source code to obtain the cookie returned by the server:

@ Overridepublic HttpResponse initiate mrequest (Request
 Request, Map
 
  
AdditionalHeaders) throws IOException, AuthFailureError {for (Entry
  
   
> Header: connection. getHeaderFields (). entrySet () {if (header. getKey ()! = Null) {String key = header. getKey (); List
   
    
Values = header. getValue (); if (key. repeated signorecase ("set-cookie") {StringBuilder cookieString = new StringBuilder (); for (String value: values) {cookieString. append (value ). append ("\ n"); // use \ n as the separator. The cookie should not contain the carriage return symbol} cookieString. deleteCharAt (cookieString. length ()-1); Header h = new BasicHeader (header. getKey (), cookieString. toString (); response. addHeader (h);} else {Header h = new BasicHeader (header. getKey (), values. get (0); response. addHeader (h) ;}}}// re-write parseNetworkResponse (): @ Overrideprotected Response in the request
    
     
ParseNetworkResponse (NetworkResponse response) {Response
     
      
SuperResponse = super. parseNetworkResponse (response); Map
      
        ResponseHeaders = response. headers; String rawCookies = responseHeaders. get ("Set-Cookie"); // set-cookie: JSESSIONID = response; Path =/otn BIGipServerotn = 2564030730.64545.0000; path =/String part1 = substring (rawCookies, "", ";"); String part2 = substring (rawCookies, "\ n", ";"); // The client needs cookie: JSESSIONID = D90B58454550B4D37C4B66A76BF27B93; BIGipServerotn = 2564030730.64545.0000; cookies = part1 + ";" + part2 + ";"; return superResponse ;}
      
     
    
   
  
 

6. When Volley sends a request, upload the cookie and rewrite getHeaders () in the request ():

@Overridepublic Map
 
  getHeaders() throws AuthFailureError {         if(cookies!= null && cookies.length() > 0){                   HashMap
  
            headers = newHashMap
   
    ();                   headers.put("Cookie",cookies);                   returnheaders;         }         returnsuper.getHeaders();}
   
  
 

7 Volley custom request:

public class ByteArrayRequest extends Request
 
  {private final Listener
  
    mListener;public ByteArrayRequest(int method, String url, Listener
   
     listener, ErrorListener errlistener) {super(method, url, errlistener);mListener = listener;}@Overrideprotected Response
    
      parseNetworkResponse(NetworkResponse response) {if(response == null){return null;}if(response.statusCode != HttpStatus.SC_OK){return null;}byte[] bytes = response.data;return Response.success(bytes, null);}@Overrideprotected void deliverResponse(byte[] response) {if(mListener != null){mListener.onResponse(response);}}}
    
   
  
 

8 Volley:

@Overridepublic RetryPolicy getRetryPolicy() {          RetryPolicyretryPolicy = new DefaultRetryPolicy(5000,DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);          returnretryPolicy; }

With an example of logging on to the Ministry of Railways 12306, the source code in: http://download.csdn.net/download/goldenfish1919/7029907

Ps: During the test, I used a local tomcat and packed it under asserts.

Refer:

Http://blog.csdn.net/xyz_lmn/article/details/12165391

Http://blog.csdn.net/xyz_lmn/article/details/12746581

Http://blog.csdn.net/xyz_lmn/article/details/12177005

Http://www.itsalif.info/content/android-volley-tutorial-http-get-post-put

Overview: http://blog.csdn.net/t12x3456/article/details/9221611

Getting Started: http://blog.csdn.net/ttdevs/article/details/17566795

Custom request: http://blog.csdn.net/ttdevs/article/details/17586205

Source code analysis: http://blog.csdn.net/ttdevs/article/details/17764351

Send https request: http://blog.csdn.net/llwdslal/article/details/18052723

Construct cache: http://stackoverflow.com/questions/16682595/android-volley-imageloader-bitmaplrucache-parameter

Parsing server cookie: http://stackoverflow.com/questions/20702178/android-volley-access-http-response-header-fields,http://blog.csdn.net/hpb21/article/details/12163371

Upload cookie: http://stackoverflow.com/questions/17049473/how-to-set-custom-header-in-volley-request

Set timeout: http://stackoverflow.com/questions/17094718/android-volley-timeout

Bytes.