Java Implementation HTTP Request tool class sample _java

Returning data through HTTP REST requests

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Import Org.apache.commons.logging.Log;
Import Org.apache.commons.logging.LogFactory;
Import Org.apache.http.NameValuePair;
Import org.apache.http.client.ClientProtocolException;
Import org.apache.http.client.HttpClient;
Import Org.apache.http.client.ResponseHandler;
Import org.apache.http.client.entity.UrlEncodedFormEntity;
Import Org.apache.http.client.methods.HttpGet;
Import Org.apache.http.client.methods.HttpPost;
Import Org.apache.http.impl.client.BasicResponseHandler;
Import org.apache.http.impl.client.DefaultHttpClient;
Import Org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;

Import java.io.IOException;
Import Java.text.MessageFormat;
Import java.util.List;
Import Java.util.concurrent.TimeUnit;

/**
* A tool class to separate an HTTP request
*
* @author Gu Wei "Guwei" on 14-4-22.3:17
*/
public class Httpclientutils {

private static Final log = Logfactory.getlog (Httpclientutils.class);
/**
* Initialization of HttpClient
*/
private static httpclient httpclient = null;

   /**
     * Production httpclient instance
     * Open, static Factory method, Use to create the monomer
     *
     * @return
     * *
    public static httpclient gethttpclient () {
        if ( HttpClient = = null) {
            httpclient = new Defaulthttpclient (New Threadsafeclientconnmanager ());
       }
        return httpclient;
   }

/**
* Post method call
*
* @param URL
* @param params parameter is a Namevaluepair key value pair Object
* @return Response string
* @throws java.io.UnsupportedEncodingException
*/
public static string Executebypost (string url, list<namevaluepair> params) {
HttpClient httpclient = Gethttpclient ();

HttpPost post = new HttpPost (URL);

responsehandler<string> ResponseHandler = new Basicresponsehandler ();
String Responsejson = null;
try {
if (params!= null) {
Post.setentity (New urlencodedformentity (params));
}
Responsejson = Httpclient.execute (post, ResponseHandler);
Log.info ("httpclient POST request Result:" + Responsejson);
catch (Clientprotocolexception e) {
E.printstacktrace ();
Log.info ("httpclient POST request Exception:" + E.getmessage ());
catch (IOException e) {
E.printstacktrace ();
finally {
Httpclient.getconnectionmanager (). Closeexpiredconnections ();
Httpclient.getconnectionmanager (). Closeidleconnections (Timeunit.seconds);
}
return Responsejson;
}

/**
* Get mode Request
*
* @param url with parameter placeholders, example: Http://****/user/user/center.aspx?_action=getsimpleuserinfo&codes={0}&email={1}
* @param params parameter value array, which needs to correspond to the placeholder order in the URL
* @return Response string
* @throws java.io.UnsupportedEncodingException
*/
public static string Executebyget (String URL, object[] params) {
HttpClient httpclient = Gethttpclient ();

String messages = Messageformat.format (URL, params);

HttpGet get = new HttpGet (messages);

responsehandler<string> ResponseHandler = new Basicresponsehandler ();
String Responsejson = null;
try {
Responsejson = Httpclient.execute (GET, ResponseHandler);
Log.info ("HttpClient GET request Result:" + Responsejson);
catch (Clientprotocolexception e) {
E.printstacktrace ();
Log.info ("HttpClient GET Request Exception:" + E.getmessage ());
catch (IOException e) {
E.printstacktrace ();
Log.info ("HttpClient GET Request Exception:" + E.getmessage ());
finally {
Httpclient.getconnectionmanager (). Closeexpiredconnections ();
Httpclient.getconnectionmanager (). Closeidleconnections (Timeunit.seconds);
}
return Responsejson;
}

/**
* @param URL
* @return
*/
public static string Executebyget (string url) {
HttpClient httpclient = Gethttpclient ();

HttpGet get = new HttpGet (URL);

responsehandler<string> ResponseHandler = new Basicresponsehandler ();
String Responsejson = null;
try {
Responsejson = Httpclient.execute (GET, ResponseHandler);
Log.info ("HttpClient GET request Result:" + Responsejson);
catch (Clientprotocolexception e) {
E.printstacktrace ();
Log.info ("HttpClient GET Request Exception:" + E.getmessage ());
catch (IOException e) {
E.printstacktrace ();
Log.info ("HttpClient GET Request Exception:" + E.getmessage ());
finally {
Httpclient.getconnectionmanager (). Closeexpiredconnections ();
Httpclient.getconnectionmanager (). Closeidleconnections (Timeunit.seconds);
}
return Responsejson;
}
}