Implementation of HTTP Access tool classes based on HttpClient4.5.1

This tool class is based on httpclient4.5.1 implementation, click here to view the official version of the HttpClient4.5.1 manual.

1. Pom.xml-dependent Package settings

<dependency>
	<groupId>org.apache.httpcomponents</groupId>
	<artifactId> httpclient</artifactid>
	<version>4.5.1</version>
</dependency>

2. HttpClient Tool Class

Import java.io.IOException;
Import java.io.UnsupportedEncodingException;
Import java.net.URISyntaxException;
Import java.util.ArrayList;

Import Java.util.Map;
Import org.apache.http.HttpEntity;
Import Org.apache.http.NameValuePair;
Import org.apache.http.client.ClientProtocolException;
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.client.methods.HttpRequestBase;
Import Org.apache.http.client.utils.URIBuilder;
Import org.apache.http.impl.client.CloseableHttpClient;

Import org.apache.http.impl.client.HttpClients;
Import Org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
Import Org.apache.http.message.BasicNameValuePair;

Import Org.apache.http.util.EntityUtils;
	/** * * @author Nan 2015-11/public class Httpclientutil {private static poolinghttpclientconnectionmanager cm; Private static String empty_str = "";

	private static String Utf_8 = "UTF-8";
			private static void Init () {if (cm = = null) {cm = new Poolinghttpclientconnectionmanager (); 
	 Cm.setmaxtotal (50);//The maximum connection number of the entire connection pool Cm.setdefaultmaxperroute (5);//maximum number of connections per route, default value is 2}}/** * get httpclient through connection pool *
		* @return */private static closeablehttpclient gethttpclient () {init ();
	Return Httpclients.custom (). Setconnectionmanager (CM). Build (); /** * * @param URL * @return/public static String httpgetrequest (String url) {httpget httpget = new Ht
		Tpget (URL);
	Return GetResult (HttpGet); public static string httpgetrequest (String URL, map<string, object> params) throws URISyntaxException {Uribui
		Lder UB = new UriBuilder ();

		Ub.setpath (URL);
		arraylist<namevaluepair> pairs = Covertparams2nvps (params);

		Ub.setparameters (pairs);
		HttpGet httpget = new HttpGet (Ub.build ());
	Return GetResult (HttpGet); public static string httpgetrequest (string URL, Map<string, object> headers, map<string, object> params) throws URISyntaxException {UriBuilder UB = new
		UriBuilder ();

		Ub.setpath (URL);
		arraylist<namevaluepair> pairs = Covertparams2nvps (params);

		Ub.setparameters (pairs);
		HttpGet httpget = new HttpGet (Ub.build ()); For (map.entry<string, object> param:headers.entrySet ()) {Httpget.addheader (Param.getkey (), String.valueof (PA
		Ram.getvalue ()));
	Return GetResult (HttpGet);
		public static string httppostrequest (string url) {HttpPost httppost = new HttpPost (URL);
	Return GetResult (HttpPost);  public static string httppostrequest (String URL, map<string, object> params) throws Unsupportedencodingexception
		{HttpPost HttpPost = new HttpPost (URL);
		arraylist<namevaluepair> pairs = Covertparams2nvps (params);
		Httppost.setentity (new urlencodedformentity (pairs, utf_8));
	Return GetResult (HttpPost); public static string httppostrequest (string url, map<string, object> headers, map<string, object> params) throws Unsupportedencodingexception {HttpPost HttpPost = new Httppo

		St (URL); For (map.entry<string, object> param:headers.entrySet ()) {Httppost.addheader (Param.getkey (), string.valueof (p
		Aram.getvalue ()));
		} arraylist<namevaluepair> pairs = Covertparams2nvps (params);

		Httppost.setentity (new urlencodedformentity (pairs, utf_8));
	Return GetResult (HttpPost); private static arraylist<namevaluepair> Covertparams2nvps (map<string, object> params) {Arraylist<nam
		evaluepair> pairs = new arraylist<namevaluepair> (); For (map.entry<string, object> param:params.entrySet ()) {Pairs.add (New Basicnamevaluepair (), Param.getkey
		Ng.valueof (Param.getvalue ()));
	return pairs;
		/** * Processing HTTP request * * @param request * @return/private static String GetResult (Httprequestbase request) {
		Closeablehttpclient httpclient = Httpclients.createdefault (); CloseabLehttpclient httpclient = Gethttpclient ();
			try {closeablehttpresponse response = Httpclient.execute (request);
			Response.getstatusline (). Getstatuscode ();
			httpentity entity = response.getentity (); if (entity!= null) {//Long len = Entity.getcontentlength ();//1 indicates length unknown String result = entityutils.tostring (en
				tity);
				Response.close ();
				Httpclient.close ();
			return result;
		} catch (Clientprotocolexception e) {e.printstacktrace ();
		catch (IOException e) {e.printstacktrace ();
	Finally {} return empty_str; }

}