HttpClient : Apache Http Client

Posted on January 8, 2017January 8, 2017 by coder

Apache HttpClient

HttpClient client = factory.getHttpClient(); //or any method to get a client instance
Credentials credentials = new UsernamePasswordCredentials(username, password);
client.getState().setCredentials(AuthScope.ANY, credentials);

HttpClient client = factory.getHttpClient(); //or any method to get a client instance

Credentials credentials = new UsernamePasswordCredentials(username, password);

client.getState().setCredentials(AuthScope.ANY, credentials);

CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY, 
    new UsernamePasswordCredentials("username", "password"));
CloseableHttpClient httpClient = 
    HttpClientBuilder.create().setDefaultCredentialsProvider(credentialsProvider).build();

CredentialsProvider credentialsProvider = new BasicCredentialsProvider();

credentialsProvider.setCredentials(AuthScope.ANY,

new UsernamePasswordCredentials("username", "password"));

CloseableHttpClient httpClient =

HttpClientBuilder.create().setDefaultCredentialsProvider(credentialsProvider).build();

imports

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.auth.AuthScope;

import org.apache.http.auth.UsernamePasswordCredentials;

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

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

import org.apache.http.util.EntityUtils;

Example

    HttpClient client = new HttpClient();
    HttpMethod method = new GetMethod(TESTURL);
    HostConfiguration config = client.getHostConfiguration();
    config.setProxy(PROXY_HOST, PROXY_PORT);

      String username = "Kutay";
      String password = "Zorlu";


    Credentials credentials = new UsernamePasswordCredentials(username, password);
    AuthScope authScope = new AuthScope(PROXY_HOST, PROXY_PORT);

    client.getState().setProxyCredentials(authScope, credentials);
    client.getState().setCredentials(AuthScope.ANY, credentials);

    try {
        client.executeMethod(method);

        String response = method.getResponseBodyAsString();

        if (method.getStatusCode() == HttpStatus.SC_OK) {
             response = method.getResponseBodyAsString();
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        method.releaseConnection();
    }

HttpClient client = new HttpClient();

HttpMethod method = new GetMethod(TESTURL);

HostConfiguration config = client.getHostConfiguration();

config.setProxy(PROXY_HOST, PROXY_PORT);

String username = "Kutay";

String password = "Zorlu";

Credentials credentials = new UsernamePasswordCredentials(username, password);

AuthScope authScope = new AuthScope(PROXY_HOST, PROXY_PORT);

client.getState().setProxyCredentials(authScope, credentials);

client.getState().setCredentials(AuthScope.ANY, credentials);

try {

client.executeMethod(method);

String response = method.getResponseBodyAsString();

if (method.getStatusCode() == HttpStatus.SC_OK) {

response = method.getResponseBodyAsString();

}

} catch (IOException e) {

e.printStackTrace();

} finally {

method.releaseConnection();

}

Example 2

        try {
            DefaultHttpClient httpclient = new DefaultHttpClient();

            httpclient.getCredentialsProvider().setCredentials(
                    new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT), 
                    new UsernamePasswordCredentials("kutay", "zorlu"));

            HttpPost httppost = new HttpPost("http://kutayzorlu.com:post/test/login");

            System.out.println("executing request " + httppost.getRequestLine());
            HttpResponse response;
            response = httpclient.execute(httppost);
            HttpEntity entity = response.getEntity();

            System.out.println("----------------------------------------");
            System.out.println(response.getStatusLine());
            if (entity != null) {
                System.out.println("Response content length: " + entity.getContentLength());
            }
            if (entity != null) {
                entity.consumeContent();
            }

            httpclient.getConnectionManager().shutdown();  
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

try {

DefaultHttpClient httpclient = new DefaultHttpClient();

httpclient.getCredentialsProvider().setCredentials(

new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT),

new UsernamePasswordCredentials("kutay", "zorlu"));

HttpPost httppost = new HttpPost("http://kutayzorlu.com:post/test/login");

System.out.println("executing request " + httppost.getRequestLine());

HttpResponse response;

response = httpclient.execute(httppost);

HttpEntity entity = response.getEntity();

System.out.println("----------------------------------------");

System.out.println(response.getStatusLine());

if (entity != null) {

System.out.println("Response content length: " + entity.getContentLength());

}

if (entity != null) {

entity.consumeContent();

}

httpclient.getConnectionManager().shutdown();

} catch (ClientProtocolException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

Example 3_

HttpPost httppost = new HttpPost(postData);  
CookieStore cookieStore = new BasicCookieStore();  
BasicClientCookie cookie = new BasicClientCookie("JSESSIONID", getSessionId());  
cookieStore.addCookie(cookie);  
client.setCookieStore(cookieStore);  
response = client.execute(httppost);

HttpPost httppost = new HttpPost(postData);

CookieStore cookieStore = new BasicCookieStore();

BasicClientCookie cookie = new BasicClientCookie("JSESSIONID", getSessionId());

cookieStore.addCookie(cookie);

client.setCookieStore(cookieStore);

response = client.execute(httppost);

HttpContext localContext = new BasicHttpContext();  
  
localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);  
  
response = client.execute(httppost, localContext);

HttpContext localContext = new BasicHttpContext();

localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);

response = client.execute(httppost, localContext);

HttpPost httppost = new HttpPost(postData); 
CookieStore cookieStore = new BasicCookieStore(); 
BasicClientCookie cookie = new BasicClientCookie("JSESSIONID", getSessionId());  
cookie.setDomain("kutayzorlu.com");
cookie.setPath("/posts");  
  
cookieStore.addCookie(cookie); 
client.setCookieStore(cookieStore); 
response = client.execute(httppost);

HttpPost httppost = new HttpPost(postData);

CookieStore cookieStore = new BasicCookieStore();

BasicClientCookie cookie = new BasicClientCookie("JSESSIONID", getSessionId());

cookie.setDomain("kutayzorlu.com");

cookie.setPath("/posts");

cookieStore.addCookie(cookie);

client.setCookieStore(cookieStore);

response = client.execute(httppost);

Session Management

Posted on January 8, 2017January 8, 2017 by coder

public class LoginServlet extends HttpServlet {

private static final long serialVersionUID = 1L;
private final String userID = "test";
private final String password = "test";

protected void doPost(HttpServletRequest request,
		HttpServletResponse response) throws ServletException, IOException {

	// get request parameters for userID and password
	String user = request.getParameter("user");
	String pwd = request.getParameter("pwd");
		
	if(userID.equals(user) && password.equals(pwd)){
		Cookie loginCookie = new Cookie("user",user);
		//setting cookie to expiry in 40 mins
		loginCookie.setMaxAge(40*60);
		response.addCookie(loginCookie);
		response.sendRedirect("LoginSuccess.jsp");
	}
        else
        {
		RequestDispatcher rd = getServletContext().getRequestDispatcher("/login.html");
		PrintWriter out= response.getWriter();
		out.println("<font color=red>Either user name or password is wrong.</font>");
		rd.include(request, response);
	}
}

public class LoginServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

private final String userID = "test";

private final String password = "test";

protected void doPost(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

// get request parameters for userID and password

String user = request.getParameter("user");

String pwd = request.getParameter("pwd");

if(userID.equals(user) && password.equals(pwd)){

Cookie loginCookie = new Cookie("user",user);

//setting cookie to expiry in 40 mins

loginCookie.setMaxAge(40*60);

response.addCookie(loginCookie);

response.sendRedirect("LoginSuccess.jsp");

}

else

{

RequestDispatcher rd = getServletContext().getRequestDispatcher("/login.html");

PrintWriter out= response.getWriter();

out.println("<font color=red>Either user name or password is wrong.</font>");

rd.include(request, response);

}

GetCookies

String userName = null;
Cookie[] cookies = request.getCookies();
if(cookies !=null){
for(Cookie cookie : cookies){
	if(cookie.getName().equals("user")) userName = cookie.getValue();
}

String userName = null;

Cookie[] cookies = request.getCookies();

if(cookies !=null){

for(Cookie cookie : cookies){

if(cookie.getName().equals("user")) userName = cookie.getValue();

}

Logout Example

    response.setContentType("text/html");
    Cookie loginCookie = null;
    Cookie[] cookies = request.getCookies();
    if(cookies != null)
    {
    	for(Cookie cookie : cookies){
    	if(cookie.getName().equals("user")){
    		loginCookie = cookie;
    		break;
    	}
    }

   if(loginCookie != null){
    		loginCookie.setMaxAge(0);
        	response.addCookie(loginCookie);
    	}
    	response.sendRedirect("login.html");
   }

response.setContentType("text/html");

Cookie loginCookie = null;

Cookie[] cookies = request.getCookies();

if(cookies != null)

{

for(Cookie cookie : cookies){

if(cookie.getName().equals("user")){

loginCookie = cookie;

break;

}

if(loginCookie != null){

loginCookie.setMaxAge(0);

response.addCookie(loginCookie);

}

response.sendRedirect("login.html");

}