redirection et appel d'url

bonjour quelle est la difference entre les deux codes svp

Code:

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HttpURLConnectionExample.java
 
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 reuqest header
		con.setRequestMethod("POST");
		con.setRequestProperty("User-Agent", USER_AGENT);
		con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
 
		String urlParameters = "sn=C02G8416DRJM&cn=&locale=&caller=&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:

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@WebServlet("/Redirection")
public class RedirectionVersFormulaireAjoutTerrain extends HttpServlet
{
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setStatus(HttpServletResponse.SC_MOVED_TEMPORARILY);
        response.setHeader("Location", request.getContextPath()+"/
        formulaireAjoutTerrain.html");
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

merci d'avance