Android开发中网络请求数据后缓存

来源：互联网发布：辽宁2016经济数据编辑：程序博客网时间：2024/05/29 07:05
/** * Created by zhiyuan on 16/8/31. */public abstract class Mybase {    /**     * 网络出错     */    public static final int Error_Net = 100;    /**     * 请求出错     */    public static final int Error_Request = 200;    public static final long LONGTTIME = 1000 * 60 * 60 * 72;    public static final long SHORTTIME = 1000 * 60 * 10;    public static final long NOTIME = 0;    public void getData(String path, long time) {        if (time == 0) {            getDataFromNet(path, time);        } else {            //先看本地是否有数据            String data = getDataFromLocal(path, time);            if (TextUtils.isEmpty(data)) {                //再看网络                getDataFromNet(path, time);            } else {                setResultData(data);            }        }    }    public abstract void setResultData(String data);    private void getDataFromNet(final String path, final long time) {        //先判断网络状态        int netWorkType = NetUtils.getNetWorkType(MyApplication.getContext());        if (netWorkType != NetUtils.NETWORKTYPE_INVALID) {            RequestParams requestParams = new RequestParams(path);            LogUtils.e("AAAAAAAAAAAAAAAAAA", path);            //开始请求网络            x.http().get(requestParams, new Callback.CommonCallback<String>() {                @Override                public void onSuccess(final String json) {                    setResultData(json);                    CommonUtils.executeRunnalbe(new Runnable() {                        @Override                        public void run() {                            //写数据导本地                            writeDataToLocal(json, path, time);                        }                    });                }                @Override                public void onError(Throwable throwable, boolean b) {                    setFailResult(Error_Request);                }                @Override                public void onCancelled(CancelledException e) {                }                @Override                public void onFinished() {                }            });        } else {            //网络问题            setFailResult(Error_Net);        }    }    protected abstract void setFailResult(int error_Net);    private void writeDataToLocal(String json, String path, long time) {        File cacheDir = MyApplication.getContext().getCacheDir();        File file = null;        try {            file = new File(cacheDir, MD5Encoder.encode(path));        } catch (Exception e) {            e.printStackTrace();        }        if (!file.exists()) {            try {                file.createNewFile();            } catch (IOException e) {                e.printStackTrace();            }        }        BufferedWriter bufferedWriter = null;        try {            bufferedWriter = new BufferedWriter(new FileWriter(file.getAbsolutePath()));            //21408348372737+1000*60*60            //dkgkawerghosrghseligs            //sergohelshgoeshgoserhogsh            //3238230280333333            bufferedWriter.write(System.currentTimeMillis() + time + "\r\n");            bufferedWriter.write(json);            bufferedWriter.flush();        } catch (IOException e) {            e.printStackTrace();        } finally {            try {                if (bufferedWriter != null)                    bufferedWriter.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }    /**     * 从本地获取信息     *     * @param path     * @param time @return     */    private String getDataFromLocal(String path, long time) {        File cacheDir = MyApplication.getContext().getCacheDir();        File file = null;        try {            file = new File(cacheDir, MD5Encoder.encode(path));        } catch (Exception e) {            e.printStackTrace();        }        BufferedReader bufferedReader = null;        try {            bufferedReader = new BufferedReader(new FileReader(file.getAbsolutePath()));            //之前时间＋有效时间            long t = Long.parseLong(bufferedReader.readLine());            //在有效时间之内            //90 +10            if (System.currentTimeMillis() - t < 0) {                StringBuilder stringBuilder = new StringBuilder();                String line = null;                while ((line = bufferedReader.readLine()) != null) {                    stringBuilder.append(line);                }                return stringBuilder.toString();            }        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                if (bufferedReader != null)                    bufferedReader.close();            } catch (IOException e) {                e.printStackTrace();            }        }        return null;    }}
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