Apache httpclient Component Encapsulation Tool class

Package com.mengyao.spider.utils;

Import java.util.ArrayList;
Import Java.util.HashMap;
Import Java.util.Iterator;
Import java.util.List;
Import Java.util.Map;
Import Java.util.Map.Entry;

Import Org.apache.http.Header;
Import org.apache.http.HttpEntity;
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.impl.client.CloseableHttpClient;
Import Org.apache.http.impl.client.HttpClientBuilder;
Import org.apache.http.impl.client.HttpClients;
Import Org.apache.http.message.BasicNameValuePair;
Import Org.apache.http.util.EntityUtils;
Import Org.apache.http.NameValuePair;

/**
* Dependent on Httpclient-4.4.jar, Httpcore-4.4.jar, Commons-logging-1.2.jar in the httpclient component of the Apache Httpcomponents project
* @author Mengyao
*
*/
public class Httputil {

/**
* Create HttpClient instances
* @return
*/
Public Closeablehttpclient gethttpclient () {
Httpclientbuilder builder = Httpclients.custom ();
Closeablehttpclient client = Builder.build ();
return client;
}

/**
* Construct POST request
* @param URL
* @param params
* @param encoding
* @return
* @throws Exception
*/
Public httppost gethttppost (string url, map<string, string> params, string encoding) throws exception{
HttpPost post = new HttpPost (URL);
list<namevaluepair> parammeters = new arraylist<namevaluepair> ();
iterator<entry<string, string>> Iterator = Params.entryset (). Iterator ();
while (Iterator.hasnext ()) {
Entry<string, string> next = Iterator.next ();
Parammeters.add (New Basicnamevaluepair (Next.getkey (), Next.getvalue ()));
}
Urlencodedformentity urlencodedformentity = new Urlencodedformentity (parammeters, encoding);
Post.setentity (urlencodedformentity);

return post;
}

/**
* Construct GET Request
* @param URL
* @return
*/
Public httpget gethttpget (String URL) {
HttpGet get = new HttpGet (URL);
return get;
}

/**
* Set HTTP request header parameters for post or get requests
* @param postandget
* @param headers
* @return
*/
Public Httprequestbase SetHeader (httprequestbase postandget, map<string, string> headers) {
iterator<entry<string, string>> Iterator = Headers.entryset (). Iterator ();
while (Iterator.hasnext ()) {
Entry<string, string> next = Iterator.next ();
Postandget.addheader (Next.getkey (), Next.getvalue ());
}
return postandget;
}

/**
* Gets the response header parameter in the HTTP response
* @param response
* @return
*/
Public map<string, string> GetHeader (closeablehttpresponse response) {
map<string, string> headers = new hashmap<string, string> ();
header[] allheaders = Response.getallheaders ();
for (Header header:allheaders) {
Headers.put (Header.getname (), Header.getvalue ());
}
return headers;
}

/**
* Get native data in HTTP response
* @param entity
* @param consume
* @return
* @throws Exception
*/
Public String getrawcontent (httpentity entity, Boolean consume) throws exception{
String Rawctx = entityutils.tostring (entity);
if (consume) {
Entityutils.consume (entity);
}
return rawctx;
}

/**
* Release HTTP connection
* @param Client
* @throws Exception
*/
public void Clean (Closeablehttpclient client) throws exception{
Client.close ();
}

public static void Main (string[] args) throws Exception {
Httputil httputil = new Httputil ();
/************************************* Create HttpGet request begin ***********************************/
Get an HTTP instance
Closeablehttpclient httpClient = Httputil.gethttpclient ();
Create a HttpGet request
HttpGet HttpGet = Httputil.gethttpget ("http://www.jd.com");
Set HttpGet Request Header parameters
map<string, string> headers = new hashmap<string, string> ();
Headers.put ("User-agent", "mozilla/5.0" (Windows NT 6.1; WOW64; rv:39.0) gecko/20100101 firefox/39.0 ");
Httputil.setheader (httpget, headers);
Submit a HttpGet request while getting an HTTP response
Closeablehttpresponse response = Httpclient.execute (HttpGet);
Get the response header parameters for HTTP
Map<string, string> Header = Httputil.getheader (response);
Gets the native data content in the HTTP response while closing the HTTP underlying connection
String rawcontent = httputil.getrawcontent (Response.getentity (), true);
Release this HTTP request instance
Httputil.clean (httpClient);
/************************************* Create HttpGet request End ***********************************/

HttpPost request the same as the above code, do not demonstrate
}
}

Apache httpclient Component Encapsulation Tool class