HttpUtil

public class Httputil {
public static boolean isNetworkConnected(Context context) {
if (context != null) {
//获取连接管理器
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
//获取网络状态
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if (networkInfo != null) {
//判断网络是否可用
return networkInfo.isAvailable();
}
}
return false;
}

public static String requestString(String strurl){

    try {
        //把string类型变为url
        URL url=new URL(strurl);
        //打开连接
        HttpURLConnection connection= (HttpURLConnection) url.openConnection();
        //连接超时时间
        connection.setConnectTimeout(5000);
        //设置请求方式（要大写）
        connection.setRequestMethod("GET");
        //判断请求码
        if(connection.getResponseCode()==200){
            //获取输入流 输入=读  输出=写
            InputStream stream = connection.getInputStream();
            InputStreamReader in= new InputStreamReader(stream, "utf-8");
            BufferedReader reader = new BufferedReader(in);
            //拼接字符串
            StringBuffer buffer = new StringBuffer();
            String str="";
            //读取字符串
            while((str=reader.readLine())!=null){
                buffer.append(str);
            }
            return buffer.toString();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

}