這個框架是自己閑來無事封裝的，主要用于請求json

1請求數據

public class HttpUtil {    /**     * 下載資源     * @return     */    public static byte[] requestURL(String urlStr){        InputStream in = null;        ByteArrayOutputStream out = null;        try {            URL url = new URL(urlStr);            HttpURLConnection conn = (HttpURLConnection) url.openConnection();            conn.setRequestMethod("GET");            conn.setReadTimeout(3000);            conn.connect();            if(conn.getResponseCode() == 200){                in = conn.getInputStream();                out = new ByteArrayOutputStream();                byte[] buffer = new byte[1024 * 8];                int len;                while((len = in.read(buffer)) != -1){                    out.write(buffer, 0, len);                }                //得到下載好的json字符串                return out.toByteArray();            }        } catch (Exception e) {            e.PRintStackTrace();        } finally {            try {                if(in != null){                    in.close();                }                if(out != null){                    out.close();                }            } catch (IOException e) {                e.printStackTrace();            }        }        return null;    }}2基于剛才的類加上接口回調
public class DownUtil {    /*    創建一個擁有5個線程的線程池     */    private static ExecutorService executor = Executors.newFixedThreadPool(5);    private OnDownListener onDownListener;    private Handler handler = new Handler();    //設置解析JSON的接口回調    public DownUtil setOnDownListener(OnDownListener onDownListener) {        this.onDownListener = onDownListener;        return this;    }    /**     * 下載JSON數據     */    public void downJSON(final String url){        executor.submit(new Runnable() {            @Override            public void run() {                //在子線程中執行                byte[] bytes = HttpUtil.requestURL(url);                if(bytes != null){                    String json = new String(bytes);                    //解析JSON                    if(onDownListener != null){                        final Object object = onDownListener.paresJson(json);                        //將解析的結果回傳給主線程                        handler.post(new Runnable() {                            @Override                            public void run() {                                //在主線程中執行                                onDownListener.downSucc(object);                            }                        });                    }                }            }        });    }    /**     * 接口回調     */    public interface OnDownListener{        //解析JSON時回調        Object paresJson(String json);        //解析完成后回調        void downSucc(Object object);    }}3用法
new DownUtil().setOnDownListener(上下文).downJSON(請求的url);重寫以下兩個方法
 @Override    public Object paresJson(String json) {// 這里便是得到的json，你需要對其判斷或者解析        Log.d("print", "onSuccess: -->" + json);        return null;    }    @Override    public void downSucc(Object object) {//回到主線程    }