HttpUtil tool class

HttpUtil tool class:

package com.qq.util;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;

import org.apache.http.HttpResponse;
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.util.EntityUtils;
public class HttpUtil
{
	// Create HttpClient object
	public static HttpClient httpClient = new DefaultHttpClient();
	public static final String BASE_URL =
			"http://180.201.156.166:8080/trial/";
	/**
	 *
	 * @param url the URL to send the request to
	 * @return server response string
	 * @throws Exception
	 */
	public static String getRequest(final String url)
			throws Exception
	{
		FutureTask<String> task = new FutureTask<String>(
				new Callable<String>()
				{
					@Override
					public String call() throws Exception
					{
						// Create the HttpGet object.
						HttpGet get = new HttpGet(url);
						// send GET request
						HttpResponse httpResponse = httpClient.execute(get);
						// if the server returns a response successfully
						if (httpResponse.getStatusLine()
								.getStatusCode() == 200)
						{
							// Get the server response string
							String result = EntityUtils
									.toString(httpResponse.getEntity());
							return result;
						}
						return null;
					}
				});
		new Thread(task).start();
		return task.get();
	}

	/**
	 * @param url the URL to send the request to
	 * @param params request parameters
	 * @return server response string
	 * @throws Exception
	 */
	public static String postRequest(final String url
			, final Map<String ,String> rawParams)throws Exception
	{
		FutureTask<String> task = new FutureTask<String>(
				new Callable<String>()
				{
					@Override
					public String call() throws Exception
					{
						// Create the HttpPost object.
						HttpPost post = new HttpPost(url);
						// If the number of passed parameters is relatively large, the passed parameters can be encapsulated
						List<NameValuePair> params = new ArrayList<>();
						for(String key : rawParams.keySet())
						{
							// encapsulate request parameters
							params.add(new BasicNameValuePair(key
									, rawParams.get(key)));
						}
						// set request parameters
						post.setEntity(new UrlEncodedFormEntity(
								params, "gbk"));
						// send POST request
						HttpResponse httpResponse = httpClient.execute(post);
						// if the server returns a response successfully
						if (httpResponse.getStatusLine()
								.getStatusCode() == 200)
						{
							// Get the server response string
							String result = EntityUtils
									.toString(httpResponse.getEntity());
							return result;
						}
						return null;
					}
				});
		new Thread(task).start();
		return task.get();
	}
}

Call method:

String url ="http://192.168.191.1:8080/trial/LoginServlet";
String string = HttpUtil.getRequest(url);

The above code refers to Crazy Android Handout