二次封装OKhttpClient和使用

1.先导依赖
compile ‘com.squareup.okio:okio:1.5.0’
compile ‘com.squareup.okhttp3:okhttp:3.2.0’

2.在创建要工具包和工具类
下面就是二次封装的工具类直接调用即可

package com.bwei.okhttp3ps.utils;

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

import com.bwei.okhttp3ps.activity.MainActivity;

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;

/**
 * 1. 类的用途 封装OkHttp3的工具类 用单例设计模式
 * 2. @author forever
 * 3. @date 2017/9/6 09:19
 */

public class OkHttp3Utils {
    /**
     * 懒汉 安全 加同步
     * 私有的静态成员变量 只声明不创建
     * 私有的构造方法
     * 提供返回实例的静态方法
     */
    private static OkHttpClient okHttpClient = null;


    private OkHttp3Utils() {
    }

    public static OkHttpClient getInstance() {
        if (okHttpClient == null) {
            //加同步安全
            synchronized (OkHttp3Utils.class) {
                if (okHttpClient == null) {
                    //判空 为空创建实例
                    // okHttpClient = new OkHttpClient();
/**
 * 和OkHttp2.x有区别的是不能通过OkHttpClient直接设置超时时间和缓存了，而是通过OkHttpClient.Builder来设置，
 * 通过builder配置好OkHttpClient后用builder.build()来返回OkHttpClient，
 * 所以我们通常不会调用new OkHttpClient()来得到OkHttpClient，而是通过builder.build()：
 */
                    //  File sdcache = getExternalCacheDir();
                    File sdcache = new File(Environment.getExternalStorageDirectory(), "cache");
                    int cacheSize = 10 * 1024 * 1024;
                    okHttpClient = new OkHttpClient.Builder().connectTimeout(15, TimeUnit.SECONDS)
                            .writeTimeout(20, TimeUnit.SECONDS).readTimeout(20, TimeUnit.SECONDS).cache(new Cache(sdcache.getAbsoluteFile(), cacheSize)).build();
                }
            }

        }

        return okHttpClient;
    }

    /**
     * get请求
     * 参数1 url
     * 参数2 回调Callback
     */

    public static void doGet(String url, Callback callback) {

        //创建OkHttpClient请求对象
        OkHttpClient okHttpClient = getInstance();
        //创建Request
        Request request = new Request.Builder().url(url).build();
        //得到Call对象
        Call call = okHttpClient.newCall(request);
        //执行异步请求
        call.enqueue(callback);


    }

    /**
     * post请求
     * 参数1 url
     * 参数2 回调Callback
     */

    public static void doPost(String url, Map params, Callback callback) {

        //创建OkHttpClient请求对象
        OkHttpClient okHttpClient = getInstance();
        //3.x版本post请求换成FormBody 封装键值对参数

        FormBody.Builder builder = new FormBody.Builder();
        //遍历集合
        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();

    }

    /**
     * post请求上传文件
     * 参数1 url
     * 参数2 回调Callback
     */
    public static void uploadPic(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();

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

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                //上传成功回调 目前不需要处理
            }
        });

    }

    /**
     * Post请求发送JSON数据
     * 参数一：请求Url
     * 参数二：请求的JSON
     * 参数三：请求回调
     */
    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);


    }

    /**
     * 下载文件 以流的形式把apk写入的指定文件 得到file后进行安装
     * 参数一：请求Url
     * 参数二：保存文件的路径名
     * 参数三：保存文件的文件名
     */
    public static void download(final MainActivity context, final String url, final String saveDir) {
        Request request = new Request.Builder().url(url).build();
        Call call = getInstance().newCall(request);
        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);
    }
}

3.网络请求数据

    private void getData() {
        OkHttp3Utils.doGet(url, new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String json = response.body().string();
                Message message = handler.obtainMessage(0, json);
                message.sendToTarget();
            }
        });

    }

4.将请求到的数据进行传给Handler进行解析Json串（解析就不放代码了）