BE THE CODER > Tools and Libs > Commons Http Client

Commons Http Client is a HTTP agent implementation in java supporting client-side authentication, HTTP state management and HTTP connection management. This requires the libraries httpclient-4.1.2.jar, httpcore-4.1.2.jar, httpmime-4.1.2.jar, httpclient-cache-4.1.2.jar, commons-codec.jar and commons-logging-1.1.1.jar to be in classpath. The following example shows how to make Http Post request through Http Client.

File Name :	com/bethecoder/tutorials/commons_httpclient/SimplePostRequestTest.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.commons_httpclient;



import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.util.ArrayList;

import java.util.List;



import org.apache.http.HttpResponse;

import org.apache.http.NameValuePair;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.protocol.HTTP;

import org.apache.http.util.EntityUtils;



public class SimplePostRequestTest {



  /**

   * @param args

   */

  public static void main(String[] args) {

    HttpClient httpclient = new DefaultHttpClient();

    HttpPost httppost = new HttpPost("http://localhost:8080/HTTP_TEST_APP/postreq.jsp");

    System.out.println("Requesting : " + httppost.getURI());



    try {

      List <NameValuePair> nvps = new ArrayList <NameValuePair>();

      nvps.add(new BasicNameValuePair("user", "venakta sudhakar"));

      nvps.add(new BasicNameValuePair("password", "abcd1234"));



      httppost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));



      HttpResponse response = httpclient.execute(httppost);

      System.out.println("\n\nResponse : ");

      if (response.getEntity() != null) {

        System.out.println(EntityUtils.toString(response.getEntity()));

      }



    } catch (UnsupportedEncodingException e) {

      e.printStackTrace();

    } catch (ClientProtocolException e) {

      e.printStackTrace();

    } catch (IOException e) {

      e.printStackTrace();

    } finally {

      httpclient.getConnectionManager().shutdown();

    }

  }



}

A simple Web Application which prints the request headers, parameters and body through JSP.

Simple HTTP POST Request