Deprecated Java HttpClient - How hard can it be

Question

All I m trying to do is download some JSON and deserialize it into an object  I haven t got as far as downloading the JSON yet   Almost every single HttpClient example I can find  including those on the apache site looks something like     import org apache http client HttpClient  import org apache http impl client DefaultHttpClient   public void blah         HttpClient client   new DefaultHttpClient                However  Netbeans tells me that DefaultHttpClient is deprecated  I ve tried googling for DefaultHttpClient deprecated and as many other variations as I can think of and can t find any useful results  so I m obviously missing something   What is the correct Java7 way to download the contents of a webpage  Is there really no decent Http Client as part of the language  I find that hard to believe   My Maven dependency for this is      lt dependency gt       lt groupId gt org apache httpcomponents lt  groupId gt       lt artifactId gt httpclient lt  artifactId gt       lt version gt LATEST lt  version gt       lt type gt jar lt  type gt   lt  dependency gt

User · Answer

Try jcabi-http  which is a fluent Java HTTP client  for example   String html   new JdkRequest  https   www google com      header HttpHeaders ACCEPT  MediaType TEXT HTML     fetch      as HttpResponse class     assertStatus HttpURLConnection HTTP OK     body      Check also this blog post  http   www yegor256 com 2014 04 11 jcabi-http-intro html

User · Answer

Use HttpClientBuilder to build the HttpClient instead of using DefaultHttpClient  ex   MinimalHttpClient httpclient   new HttpClientBuilder   build         Prepare a request object  HttpGet httpget   new HttpGet  http   www apache org

User · Answer

IMHO the accepted answer is correct but misses some  teaching  as it does not explain how to come up with the answer  For all deprecated classes look at the JavaDoc  if you do not have it either download it or go online   it will hint at which class to use to replace the old code  Of course it will not tell you everything  but this is a start  Example              deprecated  4 3  use   link HttpClientBuilder     lt ----- THE HINT IS HERE        ThreadSafe  Deprecated public class DefaultHttpClient extends AbstractHttpClient     Now you have the class to use  HttpClientBuilder  as there is no constructor to get a builder instance you may guess that there must be a static method instead  create  Once you have the builder you can also guess that as for most builders there is a build method  thus   org apache http impl client HttpClientBuilder create   build      AutoClosable   As Jules hinted in the comments  the returned class implements java io Closable  so if you use Java 7 or above you can now do       try  CloseableHttpClient httpClient   HttpClientBuilder create   build            The advantage is that you do not have to deal with finally and nulls   Other relevant info  Also make sure to read about connection pooling and set the timeouts

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This is the solution that I have applied to the problem that httpclient deprecated in this version of android 22   public static String getContenxtWeb String urlS        String pagina       devuelve           URL url      try           url   new URL urlS           HttpURLConnection conexion    HttpURLConnection  url                  openConnection            conexion setRequestProperty  User-Agent                    Mozilla 4 0  compatible  MSIE 7 0  Windows NT 5 1             if  conexion getResponseCode      HttpURLConnection HTTP OK                BufferedReader reader   new BufferedReader                      new InputStreamReader conexion getInputStream                  String linea   reader readLine                while  linea    null                    pagina    linea                  linea   reader readLine                              reader close                 devuelve   pagina            else               conexion disconnect                return null                    conexion disconnect            return devuelve        catch  Exception ex            return devuelve

User · Answer

You could add the following Maven dependency        lt dependency gt           lt groupId gt org apache httpcomponents lt  groupId gt           lt artifactId gt httpclient lt  artifactId gt           lt version gt 4 5 1 lt  version gt       lt  dependency gt       lt  -- https   mvnrepository com artifact org apache httpcomponents httpmime -- gt       lt dependency gt           lt groupId gt org apache httpcomponents lt  groupId gt           lt artifactId gt httpmime lt  artifactId gt           lt version gt 4 5 1 lt  version gt       lt  dependency gt    You could use following import in your java code   import org apache http HttpEntity  import org apache http HttpResponse  import org apache http client HttpClient  import org apache http client methods HttpGett  import org apache http impl client HttpClientBuilder  import org apache http client methods HttpUriRequest    You could use following code block in your java code   HttpClient client   HttpClientBuilder create   build    HttpUriRequest httpUriRequest   new HttpGet  http   example domain someuri     HttpResponse response   client execute httpUriRequest   System out println  Response   response

User · Answer

It got deprecated in version 4 3-alpha1 which you use because of the LATEST version specification  If you take a look at the javadoc of the class  it tells you what to use instead  HttpClientBuilder   In the latest stable version  4 2 3  the DefaultHttpClient is not deprecated yet

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Relevant imports   import org apache http impl client CloseableHttpClient  import org apache http impl client HttpClientBuilder  import java io IOException    Usage   HttpClient httpClient   HttpClientBuilder create   build      EDIT  after Jules  suggestion    As the build   method returns a CloseableHttpClient which is-a AutoClosable  you can place the declaration in a try-with-resources  statement  Java 7     try  CloseableHttpClient httpClient   HttpClientBuilder create   build              use httpClient  no need to close it explicitly     catch  IOException e            handle

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I would suggest using the below method if you are trying to read the json data only   URL requestUrl new URL url   URLConnection con   requestUrl openConnection    BufferedReader in   new BufferedReader new InputStreamReader con getInputStream      StringBuilder sb new StringBuilder    int cp  try       while  cp rd read     -1       sb append  char cp        catch Exception e       String json sb toString

User · Answer

For the original issue  I would request you to apply below logic    CloseableHttpClient httpClient   HttpClientBuilder create   build     HttpPost httpPostRequest   new HttpPost

User · Answer

Examples from Apache use this   CloseableHttpClient httpclient   HttpClients createDefault      The class org apache http impl client HttpClients is there since version 4 3   The code for HttpClients createDefault   is the same as the accepted answer in here

[java] Deprecated Java HttpClient - How hard can it be?

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