网络请求以及网络请求下载图片的工具类 android开发java工具类

package cc.jiusan.www.utils;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class HttpUtils {
/**
* 判断当前网络是否连接
*
* @param context
* @return
*/
public static boolean isNetWorkConn(Context context) {
ConnectivityManager manager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = manager.getActiveNetworkInfo();
if (info != null) {
return info.isConnected();
}
return false;
}

// 网络请求下载图片
public static byte[] loadImageFromNet(String url) {
//OKHttp
try {
HttpClient client = new DefaultHttpClient();
HttpGet getRequest = new HttpGet(url);
HttpResponse response = client.execute(getRequest);
// 500 服务器 错误
if (response.getStatusLine().getStatusCode() == 200) {
HttpEntity entity = response.getEntity();
return EntityUtils.toByteArray(entity);
}
} catch (Exception e) {
e.printStackTrace();
}

return null;
}

}