Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import android.util.Log;

public class Main {
    public static HttpClient httpclient;

    public static String getJSONResponseFromURL(String url, Hashtable<String, String> httpGetParams) {
        String json_string = "";
        List<NameValuePair> nvps = buildNameValuePair(httpGetParams);
        url = buildGetUrl(nvps, url);
        System.out.println("URL==>" + url);
        InputStream is = null;
        try {
            HttpGet httpget = new HttpGet(url);
            HttpResponse response = getThreadSafeClient().execute(httpget);

            HttpEntity entity = response.getEntity();
            is = entity.getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(is), 8192);
            String line = null;
            while ((line = reader.readLine()) != null) {
                json_string = json_string + line;
            }
            response.getEntity().consumeContent();
            System.out.println("Json Response==>" + json_string);
        } catch (Exception e) {
            Log.e("log_tag", "Error in http connection" + e.toString());
            return null;
        }
        return json_string;
    }

    private static List<NameValuePair> buildNameValuePair(Hashtable<String, String> httpPost) {
        if (httpPost == null)
            return null;

        List<NameValuePair> nvps = new ArrayList<NameValuePair>();
        Enumeration<String> keys = httpPost.keys();
        while (keys.hasMoreElements()) {
            String key = (String) keys.nextElement();
            String value = (String) httpPost.get(key);
            BasicNameValuePair nv = new BasicNameValuePair(key, value);
            nvps.add(nv);
        }

        return nvps;
    }

    private static String buildGetUrl(List<NameValuePair> params, String url) {
        String paramString = URLEncodedUtils.format(params, "utf-8");
        if (!url.endsWith("?"))
            url += "?";

        url += paramString;
        return url;
    }

    public static DefaultHttpClient getThreadSafeClient() {
        if (httpclient != null)
            return (DefaultHttpClient) httpclient;
        HttpParams params = new BasicHttpParams();
        ConnManagerParams.setMaxTotalConnections(params, 100);
        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);

        // Create and initialize scheme registry 
        SchemeRegistry schemeRegistry = new SchemeRegistry();
        schemeRegistry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));

        ClientConnectionManager cm = new ThreadSafeClientConnManager(params, schemeRegistry);
        httpclient = new DefaultHttpClient(cm, params);

        return (DefaultHttpClient) httpclient;
    }
}