AsyncTask 工具类

最新推荐文章于 2021-05-26 02:55:41 发布

币圈小韭菜

最新推荐文章于 2021-05-26 02:55:41 发布

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分类专栏： Android

本文链接：https://blog.youkuaiyun.com/liu_qunfeng/article/details/81253818

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本文介绍了一个简单的HTTP工具类实现，该工具类使用Java编写，并利用了异步任务处理来发送HTTP请求。文中详细展示了如何创建单例模式的HTTP工具类，通过内部类的方式实现了异步加载数据，并对响应结果进行处理。

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public class httputisl {
    private static final httputisl ourInstance = new httputisl();

    public static httputisl getInstance() {
        return ourInstance;
    }

    private httputisl() {
    }

    public void get(String s){
        new load().execute(s);

    }

    private class load extends AsyncTask<String,Void,String>{


        @Override
        protected String doInBackground(String... strings) {
            try {
                URL url = new URL(strings[0]);
                HttpURLConnection connection= (HttpURLConnection) url.openConnection();
                connection.setReadTimeout(5000);
                connection.setConnectTimeout(5000);

                if (connection.getResponseCode()==200){

                    return  String2Steam(connection.getInputStream());


                }

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

            return null;
        }


        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            if (s==null){

                netCallback.onERROr("网络错误");


            }else{
                netCallback.onSUCCESS(s);

            }


        }
    }

    private String String2Steam(InputStream inputStream) throws IOException {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        int len=-1;

        byte[] bytes = new byte[1024];

        while ((len=inputStream.read(bytes))!=-1){
            outputStream.write(bytes,0,len);


        }
        return  new String(outputStream.toByteArray());
    }


    private NetCallback  netCallback;

    public void setNetCallback(NetCallback netCallback) {
        this.netCallback = netCallback;
    }

    public  interface NetCallback{

        void onSUCCESS(String s);

        void onERROr(String ss);

    };
}