Andriodjie——OKhttp拦截器

///////////////////////////////////////////////////

import java.io.IOException;

import okhttp3.CacheControl;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;

public class CacheInterceptor implements Interceptor {

    @Override
    public Response intercept(Chain chain) throws IOException {
        //有网状态下的 最大缓存时间  1分钟
        int maxAge = 60;
        //无网状态下的 最大缓存时间  1天
        int maxStale = 60 * 60 * 24;
        Request request = chain.request();
        if(NetUtils.isNetAvailable(MyApp.context)){
            Log.i("======Available", "intercept: ");
            request.newBuilder().cacheControl(CacheControl.FORCE_NETWORK).build();
        }else{
            Log.i("======not Available", "intercept: ");
            request.newBuilder().cacheControl(CacheControl.FORCE_CACHE).build();
        }
        Response response = chain.proceed(request);
        if(NetUtils.isNetAvailable(MyApp.context)){
            response.newBuilder()
                    .removeHeader("Pragma")
                    .removeHeader("Cache-Control")
                    //cache for cache seconds
                    .header("Cache-Control", "max-age="+maxAge)
                    .build();
        }else{
            response.newBuilder()
                    .removeHeader("Pragma")
                    .removeHeader("Cache-Control")
                    //cache for cache seconds
                    .header("Cache-Control", "max-stale="+maxStale)
                    .build();
        }
        return response;
    }
}

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import android.app.Application;
import android.content.Context;


public class MyApp extends Application{
    public static Context context ;

    @Override
    public void onCreate() {
        super.onCreate();
        context = getApplicationContext();

    }
}

///////////////////////////////////////////////////

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class NetUtils {
    public static boolean isNetAvailable(Context context){
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
            if (mNetworkInfo != null) {
                return mNetworkInfo.isAvailable();
            }
        }
        return false;
    }
}

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import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.util.Log;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import okhttp3.Cache;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import okhttp3.logging.HttpLoggingInterceptor;

/**
 * 1. 类的用途    对OkHttp3二次封装   单例模式
 * 3. @date 2017/9/9 13:13
 */

public class OkHttp3Utils {

    private static OkHttpClient okHttpClient = null;

    public OkHttp3Utils() {
    }

    //通过单例模式获取实例
    public static OkHttpClient getInstance() {

        if (okHttpClient == null) {
            //同步代码
            synchronized (OkHttp3Utils.class) {
                if (okHttpClient == null) {
                    //缓存路径
                    File sdcache = new File(Environment.getExternalStorageDirectory(), "wybcache");
                    int cacheSize = 10 * 1024 * 1024;
                    //okhttp拦截器
                    HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor(new HttpLoggingInterceptor.Logger() {
                        @Override
                        public void log(String message) {
                            Log.i("msg", message.toString());
                        }
                    });
                    //拦截器日志分类
                    httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

                    //网络拦截器
                    CacheInterceptor cacheInterceptor  = new CacheInterceptor();

                    okHttpClient = new OkHttpClient.Builder().connectTimeout(15, TimeUnit.MINUTES)
                            //应用拦截起
                            .addInterceptor(httpLoggingInterceptor)
                            //网络拦截器
                            .addNetworkInterceptor(cacheInterceptor)
                            .writeTimeout(20, TimeUnit.SECONDS).readTimeout(20, TimeUnit.SECONDS)
                            .cache(new Cache(sdcache.getAbsoluteFile(), cacheSize)).build();

                    //add
                }
            }
        }
        return okHttpClient;
    }

    /**
     * get请求方式
     *
     * @param url      请求地址
     * @param callback 回调接口
     */
    public static void doGet(String url, Callback callback) {
        //获取请求对象的实例
        OkHttpClient okHttpClient = OkHttp3Utils.getInstance();
        //创建Request
        Request request = new Request.Builder().url(url).build();
        //得到Call
        Call call = okHttpClient.newCall(request);
        //执行异步请求
        call.enqueue(callback);
    }

    /**
     * post请求方式
     *
     * @param url      请求地址
     * @param params   请求体
     * @param callback 接口回调
     */
    public static void doPost(String url, Map<String, String> params, Callback callback) {
        //获取请求对象的实例
        OkHttpClient okHttpClient = OkHttp3Utils.getInstance();
        //3.x版本post请求换成FormBody 封装键值对参数
        FormBody.Builder builder = new FormBody.Builder();
        //遍历map集合给请求体添加值
        for (String key : params.keySet()) {
            builder.add(key, params.get(key));
        }
        //创建Request
        Request request = new Request.Builder().url(url).post(builder.build()).build();
        //获取call
        Call call = okHttpClient.newCall(request);
        //异步请求
        call.enqueue(callback);
    }

    /**
     * 上传文件
     *
     * @param url      接口地址
     * @param file     文件
     * @param fileName 文件名
     */
    public static void loadFile(String url, File file, String fileName) {
        //创建OkHttpClient请求对象
        OkHttpClient okHttpClient = getInstance();
        //创建RequestBody 封装file参数
        RequestBody fileBody = RequestBody.create(MediaType.parse("application/octet-stream"), file);
        //创建RequestBody 设置类型等
        RequestBody requestBody = new MultipartBody.Builder().setType(MultipartBody.FORM).addFormDataPart("file", fileName, fileBody).build();
        //创建Request
        Request request = new Request.Builder().url(url).post(requestBody).build();

        Call call = okHttpClient.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                //请求成功
            }
        });
    }

    /**
     * 上传json字符
     *
     * @param url        接口地址
     * @param jsonParams Json串
     * @param callback   接口回调
     */
    public static void doPostJson(String url, String jsonParams, Callback callback) {
        RequestBody requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), jsonParams);
        Request request = new Request.Builder().url(url).post(requestBody).build();
        Call call = getInstance().newCall(request);
        call.enqueue(callback);
    }

    /**
     * 下载
     *
     * @param context
     * @param url     下载地址
     * @param saveDir 保存的位置
     */
    public static void downFile(final Activity context, final String url, final String saveDir) {

        //创建Request
        Request request = new Request.Builder().url(url).build();
        //创建Call
        Call call = getInstance().newCall(request);
        //同步
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.i("xxx", e.toString());
            }

            @Override
            public void onResponse(Call call, final Response response) throws IOException {
                InputStream is = null;
                byte[] buf = new byte[2048];
                int len = 0;
                FileOutputStream fos = null;
                try {
                    is = response.body().byteStream();
                    //apk保存路径
                    final String fileDir = isExistDir(saveDir);
                    //文件
                    File file = new File(fileDir, getNameFromUrl(url));
                    context.runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(context, "下载成功:" + fileDir + "," + getNameFromUrl(url), Toast.LENGTH_SHORT).show();
                        }
                    });
                    fos = new FileOutputStream(file);
                    while ((len = is.read(buf)) != -1) {
                        fos.write(buf, 0, len);
                    }

                    fos.flush();
                    //apk下载完成后 调用系统的安装方法
                    Intent intent = new Intent(Intent.ACTION_VIEW);
                    intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
                    context.startActivity(intent);
                } catch (IOException e) {
                    e.printStackTrace();
                } finally {
                    if (is != null) is.close();
                    if (fos != null) fos.close();
                }
            }
        });
    }

    /**
     * @param saveDir
     * @return
     * @throws IOException 判断下载目录是否存在
     */
    public static String isExistDir(String saveDir) throws IOException {
        // 下载位置
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {

            File downloadFile = new File(Environment.getExternalStorageDirectory(), saveDir);
            if (!downloadFile.mkdirs()) {
                downloadFile.createNewFile();
            }
            String savePath = downloadFile.getAbsolutePath();
            Log.e("savePath", savePath);
            return savePath;
        }
        return null;
    }

    /**
     * @param url
     * @return 从下载连接中解析出文件名
     */
    private static String getNameFromUrl(String url) {
        return url.substring(url.lastIndexOf("/") + 1);
    }
}

////////////////////////////////////////////////////////

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

import com.bawei.zy.lanjiqi2.utils.OkHttp3Utils;

import java.io.IOException;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {

    private TextView mTv;
    private Handler handler  = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.what == 0x11){
                String  obj= (String) msg.obj;
                mTv.setText(obj);

            }
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        okUrl();

    }

    private void okUrl() {
        OkHttp3Utils.doGet("https://www.baidu.com/", new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {}

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String string = response.body().string();
                Message message = handler.obtainMessage();
                message.obj =string;
                message.what =0x11;
                handler.sendMessage(message);

            }
        });
    }

    private void initView() {
        mTv = (TextView) findViewById(R.id.tv);
    }

}