HttpClient+AsyncTask

最新推荐文章于 2018-10-25 15:26:45 发布

原创最新推荐文章于 2018-10-25 15:26:45 发布 · 318 阅读

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#HttpClient+AsyncTask #HttpClient

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本文介绍了一个使用AsyncTask从网络获取JSON数据的例子。通过设置SSL连接的信任验证，使用HttpClient发起GET请求，并解析返回的JSON数据到自定义的数据模型中，最后更新UI显示获取的数据。

AsyncTask<Void,Void,String> asyncTask=new AsyncTask<Void, Void, String>() {
        @Override
        protected String doInBackground(Void... voids) {
            SSLSocketFactory.getSocketFactory().setHostnameVerifier(new AllowAllHostnameVerifier());

            String path2=“”；
            HttpClient client=new DefaultHttpClient();
            HttpGet httpGet=new HttpGet(path2);
            try {
                HttpResponse execute = client.execute(httpGet);
                int statusCode = execute.getStatusLine().getStatusCode();
                if (statusCode==200){
                    InputStream inputStream = execute.getEntity().getContent();
                    String json = streamtoString(inputStream, "utf-8");
                    return json;
                }

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


            return null;
        }

        @Override
        protected void onPostExecute(String s) {
            Gson gson=new Gson();
            DataDataBean dataDataBean = gson.fromJson(s, DataDataBean.class);
            newslist = dataDataBean.getNewslist();


            MyAdapter adapter=new MyAdapter(newslist,MainActivity.this);
            lv.setAdapter(adapter);
        }
    };
    asyncTask.execute();
}

private String streamtoString(InputStream inputStream, String s) {

    try {
        InputStreamReader isr=new InputStreamReader(inputStream);
        BufferedReader br=new BufferedReader(isr);
        String len;
        StringBuilder sb=new StringBuilder();
        while((len=br.readLine())!=null){
            sb.append(len);
        }
        br.close();
        return sb.toString();
    } catch (IOException e) {

    }
    return null;
}