Apache HttpClient 4.5 Simple and practical

1 Creating a Maven project

<dependencies><dependency><groupid>org.apache.httpcomponents</groupid><artifactid >httpclient</artifactId><version>4.5.2</version></dependency></dependencies>

2. The test code is as follows

package com.iraid.test;import java.io.bufferedreader;import java.io.ioexception;import  java.io.inputstream;import java.io.inputstreamreader;import java.util.arraylist;import  java.util.list;import org.apache.http.httpentity;import org.apache.http.namevaluepair;import  org.apache.http.client.entity.urlencodedformentity;import  Org.apache.http.client.methods.closeablehttpresponse;import org.apache.http.client.methods.httpget;import  org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.httpclients;import org.apache.http.message.basicnamevaluepair; import org.apache.http.util.entityutils;/** * apache httpclient-4.5  simple to use.  * CloseableHttpClient  This thread-safe, with   connection pooling   management  *  @author  wangfeihu *  */public class httpclienttest {   public static&nbsP;void main (String[] args)  throws Exception {         closeablehttpclient httpclient = httpclients.createdefault ();          try {             httpget httpget = new httpget ("Http://127.0.0.1:8080/greet");             CloseableHttpResponse response1 =  Httpclient.execute (HttpGet);            //             try {                 system.out.println (Response1.getStatusLine () );                 httpentity  entity1 = response1.GetEntity ();                 //   Handling Response Content                  Inputstream is = entity1.getcontent ();                 string content = convertstreamtostring (IS);                 system.out.println ( Content);                                 //Close Flow                  entityutils.consume ( Entity1);            } finally {                 response1.close ();             }             httppost httppost = new httppost ("Http://127.0.0.1:8080/login");             List <NameValuePair> params =  New arraylist <namevaluepair> ();             params.add (New basicnamevaluepair ("username",  "Ryan"));             params.add (New basicnamevaluepair ("Password",  "secret"));             httppost.setentity (new  Urlencodedformentity (params));             Closeablehttpresponse response2&nbSp;= httpclient.execute (HttpPost);             try {                 system.out.println (Response2.getstatusline ());                 httpentity entity2 = response2.getentity ();                 // do  something useful with the response body                 // and ensure it is fully  consumed                 Inputstream is = entity2.getcontent ();                 stRing content = convertstreamtostring (IS);                 system.out.println (content);                                  entityutils.consume (Entity2);             } finally {                 response2.close ();             }        } finally {             httpclient.close ();         }    }    public static string  convertstreamtostring (INPUtstream is)  {               Bufferedreader reader = new bufferedreader (New inputstreamreader (IS));               stringbuilder sb = new  stringbuilder ();                      String line = null;               try {                   while  (line =  Reader.readline ())  != null)  {                   sb.append (line +  "\ n");                   }               } catch  (ioexception e)  {                   e.printstacktrace ();               } finally {                   try {                        Is.close ();                   } catch  (ioexception e)  {                      e.printstacktrace ();                   }               }               return sb.tostring ();           }   }

3 Connection Pool Management

/** * with htttp request connection pool */public static void pooling () {Poolinghttpclientconnectionmanager cm = new Poolinghttpclientconnectio Nmanager ();//Increase Max Total connection to 200cm.setmaxtotal ($);//increase default Max connection per route to 20cm . Setdefaultmaxperroute;//Increase Max connections for localhost:80 to 50HttpHost localhost = new Httphost ("Locahost" Cm.setmaxperroute (new Httproute (localhost), 50);//Initialize connection closeablehttpclient httpClient = Httpclients.custom (). Setconnectionmanager (CM). Build ();}

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Apache HttpClient 4.5 Simple and practical