Eksempel på kommunikation med webserver

Apache HttpClient open source vil goere det noget nemmere.

Jeg har en del eksempler paa version 3.x og vistnok et fra 4.x.

4.x eksempel:

import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
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.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;

public class Login {
    private HttpClient client;
    public Login() {
        client = new DefaultHttpClient();
    }
    public void login(String url, String userField, String userValue, String passField, String passValue) throws Exception {
        List<NameValuePair> nvp = new ArrayList<NameValuePair>();
        nvp.add(new BasicNameValuePair(userField, userValue));
        nvp.add(new BasicNameValuePair(passField, passValue));
        post(url, nvp);
    }
    public String get(String url) throws Exception {
        HttpGet met = new HttpGet(url);
        return EntityUtils.toString(client.execute(met).getEntity());
    }
    public String post(String url, List<NameValuePair> nvp) throws Exception {
        HttpPost met = new HttpPost(url);
        if (nvp != null) {
            met.setEntity(new UrlEncodedFormEntity(nvp, HTTP.UTF_8));
        }
        return EntityUtils.toString(client.execute(met).getEntity());
    }
    public static void main(String[] args) throws Exception {
        Login lgi = new Login();
        lgi.get("http://localhost:8080/login/open/test.jsp");
        lgi.login("http://localhost:8080/login/j_security_check", "j_username", "userarne", "j_password", "xxxxxx");
        System.out.println(lgi.get("http://localhost:8080/login/open/test.jsp"));
    }
}