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POHTTP Request in Java - Simple Implementation
 

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  1. POHTTP Request in Java - Simple Implementation
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    <p>I am totally new in Java. I Have just downloaded Eclipse and the latest JDK.</p> <p>Now I want to perform <strong>REST based HTTP requests in a Java application</strong> built specifically for this http requests, almost like a 'hello world' type application. I came across the following tutorials on how to do it, but I am not sure how to actually implement it in Eclipse as a project and as a working Java Application.</p> <p><a href="http://www.mkyong.com/java/how-to-send-http-request-getpost-in-java/" rel="nofollow noreferrer">http://www.mkyong.com/java/how-to-send-http-request-getpost-in-java/</a></p> <p><a href="http://www.xyzws.com/Javafaq/how-to-use-httpurlconnection-post-data-to-web-server/139" rel="nofollow noreferrer">http://www.xyzws.com/Javafaq/how-to-use-httpurlconnection-post-data-to-web-server/139</a></p> <hr> <p><strong>Now, what I did is the following:</strong></p> <p>I took the code form the Second Link example and I saved it into a file called: </p> <pre><code>HttpURLConnectionExample.java </code></pre> <p>Here is the code inside it:</p> <pre><code>package com.mkyong; import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import javax.net.ssl.HttpsURLConnection; public class HttpURLConnectionExample { private final String USER_AGENT = "Mozilla/5.0"; public static void main(String[] args) throws Exception { HttpURLConnectionExample http = new HttpURLConnectionExample(); System.out.println("Testing 1 - Send Http GET request"); http.sendGet(); System.out.println("\nTesting 2 - Send Http POST request"); http.sendPost(); } // HTTP GET request private void sendGet() throws Exception { String url = "http://www.google.com/search?q=mkyong"; URL obj = new URL(url); HttpURLConnection con = (HttpURLConnection) obj.openConnection(); // optional default is GET con.setRequestMethod("GET"); //add request header con.setRequestProperty("User-Agent", USER_AGENT); int responseCode = con.getResponseCode(); System.out.println("\nSending 'GET' request to URL : " + url); System.out.println("Response Code : " + responseCode); BufferedReader in = new BufferedReader( new InputStreamReader(con.getInputStream())); String inputLine; StringBuffer response = new StringBuffer(); while ((inputLine = in.readLine()) != null) { response.append(inputLine); } in.close(); //print result System.out.println(response.toString()); } // HTTP POST request private void sendPost() throws Exception { String url = "https://selfsolve.apple.com/wcResults.do"; URL obj = new URL(url); HttpsURLConnection con = (HttpsURLConnection) obj.openConnection(); //add request header con.setRequestMethod("POST"); con.setRequestProperty("User-Agent", USER_AGENT); con.setRequestProperty("Accept-Language", "en-US,en;q=0.5"); String urlParameters = "sn=C02G8416DRJM&amp;cn=&amp;locale=&amp;caller=&amp;num=12345"; // Send post request con.setDoOutput(true); DataOutputStream wr = new DataOutputStream(con.getOutputStream()); wr.writeBytes(urlParameters); wr.flush(); wr.close(); int responseCode = con.getResponseCode(); System.out.println("\nSending 'POST' request to URL : " + url); System.out.println("Post parameters : " + urlParameters); System.out.println("Response Code : " + responseCode); BufferedReader in = new BufferedReader( new InputStreamReader(con.getInputStream())); String inputLine; StringBuffer response = new StringBuffer(); while ((inputLine = in.readLine()) != null) { response.append(inputLine); } in.close(); //print result System.out.println(response.toString()); } } </code></pre> <p>and I imported it into Eclipse: <strong>File>Open File</strong>. So now I right-clicked on the class (HttpURLConnectionExample.java) in the right hand side 'Outline' Window and under <strong>'Run Configurations'</strong> I specified a 'project' for it, called <strong>http_request</strong>.</p> <p><img src="https://i.stack.imgur.com/rhaLg.png" alt="enter image description here"></p> <p>Now, when I right-click on the left-hand side window on 'http_requests', I go: run as>java application. It gives me the following error:</p> <pre><code>Launch Error: Selection does not contain a main type </code></pre> <p><strong>My question:</strong> What <strong>main type</strong> do I need to specify for it? How do I actually execute the http requests as seen in the code posted above? How do I run this?</p>
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    1. PTQuestion
    1. USBenjamin
    1. USDextrousDave
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    1. COYour Java file does not seem to be inside a source folder (the eclipse compiler won't find it for compilation and the eclipse runner won't be able to run it). Make it easier: create a new Java project and put your file inside the `src` folder in a package called `com.mkyong`.
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      1. POHTTP Request in Java - Simple Implementation
      1. USSotirios Delimanolis
    2. COthere are libraries like http://hc.apache.org/httpcomponents-client-ga/index.html which make this somewhat easier
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      1. POHTTP Request in Java - Simple Implementation
      1. USfree_easy
    3. CO@SotiriosDelimanolis, I think you're correct. The snapshot shows a project `http_requests` with no `src` folder and the file path says `..\QuickFile\Java Project\HttpURLConnectionExample.java`.
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      1. POHTTP Request in Java - Simple Implementation
      1. USRavi Thapliyal
 

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