OKHTTP 上传图片,下载图片

MainActivity 操作上传照片 ,下载照片

package com.example.imageokhttp;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.File;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button btn_up;
    private Button btn_down;
    private ImageView image;
    //上传图片网址
    private String path="https://www.718shop.com/sell/sell.m.picture.upload.do";

    //下载图片网址
    private String pathDown = "https://10.url.cn/eth/ajNVdqHZLLAxibwnrOxXSzIxA76ichutwMCcOpA45xjiapneMZsib7eY4wUxF6XDmL2FmZEVYsf86iaw/";

    private static final int SUCCESS = 254;
    private static final int FALL = 318;

    Handler mHandler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case SUCCESS:
                    byte[] picture_bt = (byte [])msg.obj;
                    //使用BitmapFatory工厂,把字节数组转成Bitmap
                    Bitmap bitmap = BitmapFactory.decodeByteArray(picture_bt,0,picture_bt.length);
                    //通过ImageView,设置图片
                    image.setImageBitmap(bitmap);

                    break;
                case FALL:
                    Toast.makeText(MainActivity.this, "请求失败", Toast.LENGTH_SHORT).show();
                    break;
            }
        }
    };

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

    private void initView() {
        btn_up = (Button) findViewById(R.id.btn_up);
        btn_down = (Button) findViewById(R.id.btn_down);
        image = (ImageView) findViewById(R.id.image);

        btn_up.setOnClickListener(this);
        btn_down.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            //上传照片
            case R.id.btn_up:
                //创建文件对象
                File file = new File(Environment.getExternalStorageDirectory()+"/Download/","b.jpg");

                //创建requestBody封装参数
                RequestBody requestBody = RequestBody.create(MediaType.parse("application/octet_stream"),file);
                //创建MultipartBody,给requestBody进行设置
                MultipartBody multipartBody = new MultipartBody.Builder()
                        .setType(MultipartBody.FORM)
                        .addFormDataPart("image","b.jpg",requestBody)
                        .build();
                //创建ruquest
                final Request request = new Request.Builder()
                        .url(path)
                        .post(multipartBody)
                        .build();
                //1.创建OkHttpClient 设置读取,连接,写入超时
                OkHttpClient client = new OkHttpClient.Builder()
                        .readTimeout(10, TimeUnit.SECONDS)
                        .writeTimeout(10, TimeUnit.SECONDS)
                        .connectTimeout(10, TimeUnit.SECONDS)
                        .build();
                //创建Call对象
                client.newCall(request).enqueue(new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {

                    }

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                        Log.i("lz",response.body().string());
                    }
                });
                break;
             //下载照片
            case R.id.btn_down:
                //1.创建OkHttpClient 设置读取,连接,写入超时
                OkHttpClient okHttpClient = new OkHttpClient.Builder()
                        .readTimeout(10, TimeUnit.SECONDS)
                        .writeTimeout(10, TimeUnit.SECONDS)
                        .connectTimeout(10, TimeUnit.SECONDS)
                        .build();
                Request request1 = new Request.Builder().url(pathDown).build();
                Call call = okHttpClient.newCall(request1);
                call.enqueue(new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                      mHandler.sendEmptyMessage(FALL);
                    }

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {

                        //从网上拿到了图片的字节数组
                        byte[] picture_bt = response.body().bytes();
                        //通过handle更新UI
                        Message message = mHandler.obtainMessage();
                        message.obj = picture_bt;
                        message.what = SUCCESS;
                        mHandler.sendMessage(message);
                    }
                });
                break;
        }
    }
}

添加权限

 <uses-permission android:name="android.permission.INTERNET"/>

导入OKHTTP依赖

compile 'com.squareup.okhttp3:okhttp:3.4.2'