public class Http<T> extends AsyncTask<String,Void,T> {
 private OnResponseListener<T> listener;
 public void setListener(OnResponseListener<T> listener) {
 this.listener = listener;
 }
 @Override
 protected T doInBackground(String... params) {
 return null;
 }
 @Override
 protected void onPostExecute(T t) {
 super.onPostExecute(t);
 if (listener!=null){
  listener.onResponse(t);
 }
 }
 //接口 类似一个监听事件
 public interface OnResponseListener<T>{
 void onResponse(T t);
 }
}
//获取数据的测试类
public class Test {
 //要获取的user对象
 private User user1=null;
 public void get(){
 //创建网络访问实例
 Http<User> http=new Http<User>();
 //重写接口
 http.setListener(new Http.OnResponseListener<User>() {
  @Override
  public void onResponse(User user) {
  user1=user;
  }
 });
 http.execute("xxx.balabala.com");
 }
}

protected T doInBackground(String... params) {
 //网络连接对象
 HttpURLConnection connection=null;
 //输入流 获取网络数据
 InputStream is=null;
 //字节数组输出流
 ByteArrayOutputStream bos=null;
 try {
  //获取网络连接对象
  connection=(HttpURLConnection) new URL(params[0]).openConnection();
  //设置get请求 必须大写
  connection.setRequestMethod("GET");
  //获取网络请求码 200 400 500之类 不懂百度
  int code=connection.getResponseCode();
  if(code==200){
  //获取流
  is=connection.getInputStream();
  //临时字节数组
  byte [] b=new byte[1024];
  int len=-1;
  bos=new ByteArrayOutputStream();
  while ((len=is.read(b))!=-1){
   //写入数据
   bos.write(b,0,len);
  }
  String json=bos.toString("utf-8");
  T t=JSON.parseObject(json,type);
  return t;
  }else{
  Log.e("error","网络访问失败==========="+code);
  }
 } catch (IOException e) {
  e.printStackTrace();
 }finally {
  try {
  if (bos!=null){
   bos.close();
  }
  if (is!=null){
   is.close();
  }
  } catch (IOException e) {
  e.printStackTrace();
  }
  if (connection!=null){
  connection.disconnect();
  }
 }
 return null;
 }

protected T doInBackground(String... params) {
 //分割url 分为地址和参数两部分
 String[] strArr=params[0].split("\\?");
 HttpURLConnection connection=null;
 //输出流
 OutputStream os=null;
 //输入流
 InputStream is=null;
 ByteArrayOutputStream bos=null;
 try {
  connection=(HttpURLConnection) new URL(strArr[0]).openConnection();
  connection.setRequestMethod("POST");
  //设置允许输入 输出 默认值true 不写也可以
  connection.setDoOutput(true);
  connection.setDoInput(true);
  os=connection.getOutputStream();
  //把参数写入
  os.write(strArr[1].getBytes("utf-8"));
  os.close();
  int code=connection.getResponseCode();
  if(code==200){
  is=connection.getInputStream();
  byte [] b=new byte[1024];
  int len=-1;
  bos=new ByteArrayOutputStream();
  while ((len=is.read(b))!=-1){
   bos.write(b,0,len);
  }
  String json=bos.toString("utf-8");
  T t=JSON.parseObject(json,type);
  return t;
  }else{
  Log.e("error","网络访问失败==========="+code);
  }
 } catch (IOException e) {
  e.printStackTrace();
 }finally {
  try {
  if (bos!=null){
   bos.close();
  }
  if (is!=null){
   is.close();
  }
  } catch (IOException e) {
  e.printStackTrace();
  }
  if (connection!=null){
  connection.disconnect();
  }
 }
 return null;
 }