网络请求get/post工具类：NetUtil

转载请注明出处

package com.net.util;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
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.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;
import android.widget.Toast;

public class NetUtil {
	private static final String TAG = "NetUtil";

	/**
	 * 网络连接是否可用
	 */
	public static boolean isConnnected(Context context) {
		ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
		if (null != connectivityManager) {
			NetworkInfo networkInfo[] = connectivityManager.getAllNetworkInfo();

			if (null != networkInfo) {
				for (NetworkInfo info : networkInfo) {
					if (info.getState() == NetworkInfo.State.CONNECTED) {
						Log.e(TAG, "the net is ok");
						return true;
					}
				}
			}
		}
		Toast.makeText(context, "网络连接失败", Toast.LENGTH_SHORT).show();
		return false;
	}

	/**
	 * 网络可用状态下，通过get方式向server端发送请求，并返回响应数据
	 * 
	 * @param strUrl 请求网址
	 * @param context 上下文
	 * @return 响应数据
	 */
	public static JSONObject getResponseForGet(String strUrl, Context context) {
		if (isConnnected(context)) {
			return getResponseForGet(strUrl);
		}
		return null;
	}

	/**
	 * 通过Get方式处理请求，并返回相应数据
	 * 
	 * @param strUrl 请求网址
	 * @return 响应的JSON数据
	 */
	public static JSONObject getResponseForGet(String strUrl) {
		HttpGet httpRequest = new HttpGet(strUrl);
		return getRespose(httpRequest);
	}

	/**
	 * 网络可用状态下，通过post方式向server端发送请求，并返回响应数据
	 * 
	 * @param market_uri 请求网址
	 * @param nameValuePairs 参数信息
	 * @param context 上下文
	 * @return 响应数据
	 */
	public static JSONObject getResponseForPost(String market_uri, List<NameValuePair> nameValuePairs, Context context) {
		if (isConnnected(context)) {
			return getResponseForPost(market_uri, nameValuePairs);
		}
		return null;
	}

	/**
	 * 通过post方式向服务器发送请求，并返回响应数据
	 * 
	 * @param strUrl 请求网址
	 * @param nameValuePairs 参数信息
	 * @return 响应数据
	 */
	public static JSONObject getResponseForPost(String market_uri, List<NameValuePair> nameValuePairs) {
		if (null == market_uri || "" == market_uri) {
			return null;
		}
		HttpPost request = new HttpPost(market_uri);
		try {
			request.setEntity(new UrlEncodedFormEntity(nameValuePairs));
			return getRespose(request);
		} catch (UnsupportedEncodingException e1) {
			e1.printStackTrace();
		}
		return null;
	}

	/**
	 * 响应客户端请求
	 * 
	 * @param request 客户端请求get/post
	 * @return 响应数据
	 */
	public static JSONObject getRespose(HttpUriRequest request) {
		try {
			HttpResponse httpResponse = new DefaultHttpClient().execute(request);
			int statusCode = httpResponse.getStatusLine().getStatusCode();
			if (HttpStatus.SC_OK == statusCode) {
				String result = EntityUtils.toString(httpResponse.getEntity());
				Log.i(TAG, "results=" + result);
				return new JSONObject(result);
			}
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (JSONException e) {
			e.printStackTrace();
		}
		return null;
	}
}