public class CacheDemo {
public static void main(String[] args) {
CacheConfig cacheConfig = new CacheConfig();
cacheConfig.setMaxCacheEntries(1000);
cacheConfig.setMaxObjectSizeBytes(1024 * 1024);
HttpClient cachingClient = new CachingHttpClient(new DefaultHttpClient(), cacheConfig);
HttpContext localContext = new BasicHttpContext();
sendRequest(cachingClient, localContext);
CacheResponseStatus responseStatus = (CacheResponseStatus) localContext.getAttribute(
CachingHttpClient.CACHE_RESPONSE_STATUS);
checkResponse(responseStatus);
sendRequest(cachingClient, localContext);
responseStatus = (CacheResponseStatus) localContext.getAttribute(
CachingHttpClient.CACHE_RESPONSE_STATUS);
checkResponse(responseStatus);
}
static void sendRequest(HttpClient cachingClient, HttpContext localContext) {
HttpGet httpget = new HttpGet("http://www.mydomain.com/content/");
HttpResponse response = null;
try {
response = cachingClient.execute(httpget, localContext);
} catch (ClientProtocolException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
HttpEntity entity = response.getEntity();
try {
EntityUtils.consume(entity);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
static void checkResponse(CacheResponseStatus responseStatus) {
switch (responseStatus) {
case CACHE_HIT:
System.out.println("A response was generated from the cache with no requests "
+ "sent upstream");
break;
case CACHE_MODULE_RESPONSE:
System.out.println("The response was generated directly by the caching module");
break;
case CACHE_MISS:
System.out.println("The response came from an upstream server");
break;
case VALIDATED:
System.out.println("The response was generated from the cache after validating "
+ "the entry with the origin server");
break;
}
}
}
It is not worked for me.
Every time it get the data from the server.not from the cache.
I m using jar "httpclient-cache-4.1-beta1".
You haven't showed us what's going on with your HTTP server. Is the service at mydomain.com/content setting the correct Cache-Control headers on the HTTP response? For caching to work, you need to have your HTTP server or web application indicate if the data can be cached and the length that the data can be cached using the appropriate headers.
Also, check the API documented on CachingHttpClient to see what headers it expects from the web server.
Related
I developed an ODataClient in Java in order to create new entities. I am encountering difficulties to create new entities. I took the initiative to see all messages sent by my client with Fiddler.
ODataEntityCreateRequest<ClientEntity> request=
client.getCUDRequestFactory()
.getEntityCreateRequest(new URI("http://localhost:8888/"), clientEntity);
request.addCustomHeader("Content-Type", "application/json;odata.metadata=minimal");
request.setAccept("application/json;odata=minimalmetadata");
ODataEntityCreateResponse<ClientEntity> response = request.execute();
below the first line of the body I obtained with Fiddler:
17b
{"#odata.type":"#ODataDemo.Product", ....}
I tested manually with Fiddler to create a new entity and the first line of message body should be:
{"odata.type":"ODataDemo.Product", ....}
I would like to know if it possible to set the body of the request with Odata in order to delete "#" and "#".
Thanks,
I found an alternative solution to this problem. I do not use entirely OData libraries. I created methods to to the post Request.
public void insertData(String entityName, Entity entity)
{
try {
ResWrap<Entity> resW = new ResWrap<Entity>(new URI(this.baseURI.concat("/").concat(entityName)), "full", entity);
ClientEntity clientEntity = this.client.getBinder().getODataEntity(resW);
//String message = getMessageRebuild(client.getWriter().writeEntity(clientEntity, ContentType.APPLICATION_JSON));
InputStream is = client.getWriter().writeEntity(clientEntity, ContentType.APPLICATION_JSON);
if(is != null)
{
System.out.println("POST: "+post(this.baseURI.concat("/").concat(entityName), is));
//System.out.println("POST:"+post("http://localhost:8888/"+entityName, is));
}
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ODataSerializerException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public String post(String url,InputStream message) throws Exception{
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(url);
//post.addHeader("Content-Type", "application/json;odata.metadata=minimal");
//post.addHeader("Accept", "application/json;odata=verbose");
post.addHeader("Content-Type", "application/json");
post.addHeader("Accept", "application/json");
HttpEntity entity = new ByteArrayEntity(IOUtils.toByteArray(message));
post.setEntity(entity);
HttpResponse response = client.execute(post);
String result = EntityUtils.toString(response.getEntity());
return result;
}
insertData take two parameters : entityName + Entity I generated.
I use the librairie org.apache.http to send the http message to the OData Server.
I've never really used http requests in Java, I'm trying to make a request that would basically recreate this http://supersecretserver.net:8080/http://whateverwebsite.com
This server takes whatever website and returns only the text of the page in the body of the response.
The code is as follows:
public String getText(String webPage) throws ParseException, IOException{
HttpResponse response = null;
try {
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet();
request.setURI(new URI("http://supersecretserver.net:8080/" + "http://www.androidhive.info/2012/01/android-text-to-speech-tutorial/"));
response = client.execute(request);
} catch (URISyntaxException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String responseBody = "No text found on webpage.";
int responseCode = response.getStatusLine().getStatusCode();
switch(responseCode) {
case 200:
HttpEntity entity = response.getEntity();
if(entity != null) {
responseBody = EntityUtils.toString(entity);
}
}
System.out.println("Returning Response..");
System.out.println(responseBody);
return responseBody;
}
It seems to get stuck on
response = client.execute(request);
I'm not sure what the problems is, any insight would be helpful.
Seems likely that your HttpClient is not timing out, you can set a timeout value by following this example (from http://www.jayway.com/2009/03/17/configuring-timeout-with-apache-httpclient-40/)
You just to have to consider a timeout value that makes sense for you.
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpParams params = httpClient.getParams();
HttpConnectionParams.setConnectionTimeout(httpParams, connectionTimeoutMillis);
HttpConnectionParams.setSoTimeout(httpParams, socketTimeoutMillis);
Also as your HttpClient is not connecting (since it's getting stuck) you should also take into consideration why is that happening (maybe you need to configure a proxy?)
I use the following code and run the method multiple times, a few times I get a response in GZIP which is what I expect and a few other times I get a response that is completely different(non GZIP page not found). However if I download the same URL multiple times using Mozilla or IE I consistently get the same GZIP response.
Is this an error with the server I am trying to reach to, or do I need to set any parameters to get a consistent response ?
The URL I am trying to download is the following, can you please let me know ?
public static byte[] dowloadURL(URL urlToDownload) {
InputStream iStream = null;
byte[] urlBytes = null;
try {
//HttpClient httpClient = new HttpClient();
org.apache.http.client.
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(urlToDownload.toString());
HttpResponse response = httpClient.execute(httpget);
iStream = response.getEntity().getContent();
urlBytes = IOUtils.toByteArray(iStream);
String responseString = new String(urlBytes);
System.out.println(" >>> The response string for " +urlToDownload.toString()+ " is " +responseString);
} catch (IOException e) {
System.err.printf("Failed while reading bytes from %s: %s",
urlToDownload.toExternalForm(), e.getMessage());
e.printStackTrace();
// Perform any other exception handling that's appropriate.
} finally {
if (iStream != null) {
try {
iStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return urlBytes;
}
I'm trying to perform a GET request to the server that returns me a JSON file. But I am getting an error in the HTTP statusLine / 422. Anyone know why. Below I show how I'm doing
public void testConverteArquivoJsonEmObjetoJava() {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet get = new HttpGet(
"http://safe-sea-4024.ppooiheroku4554566adffasdfasdfalaqwerpcp.com/crimes/mobilelist");
get.setHeader("Accept", "application/json");
get.setHeader("Content-type", "application/json");
get.getParams()
.setParameter("token",
"0V1AYFK12SeCZHYgXbNMew==$tRqPNplipDwtbD0vxWv6GPJIT6Yk5abwca3IJ88888a6JhMs=");
HttpResponse httpResponse;
try {
httpResponse = httpClient.execute(get);
String jsonDeResposta = EntityUtils.toString(httpResponse
.getEntity());
System.out.println();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Usually you do not specify a Content-Type header with a GET request. This header tells the server how to interpret the entity includes in the message. It is possible that the server side is expecting a JSON entity even though GET cannot include a body. Try removing the Content-Type header.
I tried the URL that you cleverly changed and got it to work fine. However, I did get a 422 when I specified a different token query parameter. Being that the status line is missing a phrase, I would assume that the Ruby application is generating it.
I managed to solve the problem. I was passing the parameter so wrong. According to this post [blog]:How to add parameters to a HTTP GET request in Android? "link". This method is used to that I kind of POST request
this method is correct
public void testConverteArquivoJsonEmObjetoJava() {
List<NameValuePair> params = new LinkedList<NameValuePair>();
params.add(new BasicNameValuePair("token","0V1AYFK12SeCZHYgXbNMew==$="));
String paramString = URLEncodedUtils.format(params, "utf-8");
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet get = new HttpGet(
"http://safep.com/crimes/mobilelist" + "?"
+ paramString);
HttpResponse httpResponse;
try {
httpResponse = httpClient.execute(get);
String jsonDeResposta = EntityUtils.toString(httpResponse
.getEntity());
System.out.println();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}`
Ok... in my quest for surfing the web programmatically in android. I am finally convinced that apache http api is the way to go. I need some help using it though. I have managed to login using httppost however I would like to be able to continue after that. taking the facebook example again, I login to facebook, now I want to use this login session to lets say post a status, how do I proceed?
this is the code so far(requires cleaning and stuff, it was mostly copied from various sources)
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
DefaultHttpClient httpclient = new DefaultHttpClient();
try {
HttpGet httpget = new HttpGet("https://www.facebook.com/");
try{
HttpResponse response = httpclient.execute(httpget);
HttpEntity entity = response.getEntity();
// System.out.println("Login form get: " + response.getStatusLine());
// EntityUtils.consume(entity);
// System.out.println("Initial set of cookies:");
List<Cookie> cookies = httpclient.getCookieStore().getCookies();
if (cookies.isEmpty()) {
System.out.println("None");
} else {
for (int i = 0; i < cookies.size(); i++) {
System.out.println("- " + cookies.get(i).toString());
}
}
// https://www.facebook.com/login.php?login_attempt=1
HttpPost httpost = new HttpPost("https://www.facebook.com/login.php?login_attempt=1");
List <NameValuePair> nvps = new ArrayList <NameValuePair>();
nvps.add(new BasicNameValuePair("email", "****"));
nvps.add(new BasicNameValuePair("pass", "****"));
try {
httpost.setEntity(new UrlEncodedFormEntity(nvps));
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
response = httpclient.execute(httpost);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
entity = response.getEntity();
Toast.makeText(getBaseContext(), "done",Toast.LENGTH_LONG);
System.out.println("Login form get: " + response.getStatusLine());
// EntityUtils.consume(entity);
System.out.println("Post logon cookies:");
cookies = httpclient.getCookieStore().getCookies();
if (cookies.isEmpty()) {
System.out.println("None");
} else {
for (int i = 0; i < cookies.size(); i++) {
System.out.println("- " + cookies.get(i).toString());
}
}
}finally {} }catch (Exception e) {
// TODO: handle exception
}finally {
// When HttpClient instance is no longer needed,
// shut down the connection manager to ensure
// immediate deallocation of all system resources
httpclient.getConnectionManager().shutdown();
Toast.makeText(getBaseContext(), "done",Toast.LENGTH_LONG);
}
}
}
Replace the stars with your email and password and this gets you inside facebook, how do I proceed from there to post a status?
again please don't tell me there is a facebook api, I don't want to use it, the point here is to learn to use apache libraries
The best way to start would be to wireshark and see what a browser is doing when posting a status. Then adapt to it in the HTTPClient.
The best way to keep a session in Mobile Client should be use OAuth, When you get the OAuth Token, you can use the token to use any api that Facebook providers.