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要引入okhttp.jar 

private void HttpResponse(String url, final TextView textView) {        OkHttpClient client = new OkHttpClient();        Request request = new Request                .Builder()                .url(url)//要访问的链接                .build();        Call call = client.newCall(request);        call.enqueue(new okhttp3.Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, okhttp3.Response response) throws IOException {                String res = response.body().string();                //Log.i("response===========>",res);                if (textView == null) {                    //Mtoast40(res);//这里我是交给handler处理字符串的比如json，或者土司显示                } else {                    textView.setText(res);                }            }        });    }

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