是否有网络

private void setThread() {
mThread=new Thread(){
        @Override
public void run() {
super.run();
if (Ntil.isNetworkAvailable(CS2Activity.this)){
mResponse=Ntil.sendData("http://192.168.1.118:8080/classserver/readPartInfo");
 Log.i("调试",mResponse);
 parseData();
mHandler.sendEmptyMessage(UP_DATA);
 }else {
mHandler.sendEmptyMessage(NET);
 }
 }
 };
}

package com.example.rachel.ytceshi;

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

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Created by Rachel on 2017/3/6.
 */
public class Ntil {
private static HttpURLConnection con;
private static BufferedReader buff;

public static boolean isNetworkAvailable(Context context) {
boolean is=false;
 ConnectivityManager conManager= (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (null==conManager||null==conManager.getActiveNetworkInfo()){
 is=false;
 }else {
 is=true;
 }

return is;
 }

public static String sendData(String s) {
 String mResult="";
try {
createConnectiom(s);
setParams();
 mResult=readData(mResult);
return mResult;
 }catch (Exception e){
 e.printStackTrace();
 }finally {
if (buff!=null){
try {
buff.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 }
return mResult;
 }

private static String readData(String mResult) {
try {
buff=new BufferedReader(new InputStreamReader(con.getInputStream()));
 String line;
if ((line=buff.readLine())!=null){
if (mResult.equals("")){
 mResult+=line;
 }else {
 mResult+="\n"+line;
 }


 }
 } catch (IOException e) {
 e.printStackTrace();
 }
return mResult;
 }

private static void createConnectiom(String s) {
try {
 URL murl=new URL(s);
con = (HttpURLConnection) murl.openConnection();
 } catch (MalformedURLException e) {
 e.printStackTrace();
 } catch (IOException e) {
 e.printStackTrace();

 }
 }

private static void setParams() {
con.setConnectTimeout(20*1000);
con.setReadTimeout(20*1000);
con.setDoInput(true);
con.setDoOutput(true);
 }
}