本文实例为大家分享了OkHttp实现下载图片和上传图片的具体代码，供大家参考，具体内容如下

MainActivity.java

public class MainActivity extends AppCompatActivity {

private String Path = "https://10.url.cn/eth/ajNVdqHZLLAxibwnrOxXSzIxA76ichutwMCcOpA45xjiapneMZsib7eY4wUxF6XDmL2FmZEVYsf86iaw/";

private static final int SUCCESS = 993;

private static final int FALL = 814;

Handler handler = new Handler() {

@Override

public void handleMessage(Message msg) {

switch (msg.what) {

//加载网络成功,进行UI的更新,处理得到的图片资源

case SUCCESS:

//通过message,拿到字节数组

byte[] Picture = (byte[]) msg.obj;

//使用BitmapFactory工厂,把字节数组转换为bitmap

Bitmap bitmap = BitmapFactory.decodeByteArray(Picture, 0, Picture.length);

//通过ImageView,设置图片

mImageView_okhttp.setImageBitmap(bitmap);

break;

//当加载网络失败,执行的逻辑代码

case FALL:

Toast.makeText(MainActivity.this, "网络异常", Toast.LENGTH_SHORT).show();

break;

default:

break;

}

}

};

private ImageView mImageView_okhttp;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//初始化控件

initView();

}

private void initView() {

mImageView_okhttp = (ImageView) findViewById(R.id.imageView_okhttp);

}

/**

* 根据点击事件获取络上的图片资源,使用的是OKhttp框架

*

* @param view

*/

public void Picture_okhttp_bt(View view) {

//1. 创建OKhttpClient对象

OkHttpClient okHttpClient = new OkHttpClient();

//2.建立Request对象,设置参数,请求方式如果是get,就不用设置,默认使用的就是get

Request request = new Request.Builder()

.url(Path)//设置请求网址

.build();//建立request对象

//3.创建一个Call对象,参数是request对象,发送请求

Call call = okHttpClient.newCall(request);

//4.异步请求,请求加入调度

call.enqueue(new Callback() {

@Override//请求失败回调

public void onFailure(Call call, IOException e) {

handler.sendEmptyMessage(FALL);

}

@Override//请求成功回调

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

//得到从网上获取资源,转换成我们想要的类型

byte[] Picture_bt = response.body().bytes();

//通过handler更新UI

Message message = handler.obtainMessage();

message.obj = Picture_bt;

message.what = SUCCESS;

handler.sendMessage(message);

}

});

}

//当按钮点击时,执行使用OKhttp上传图片到服务器(http://blog.csdn.net/tangxl2008008/article/details/51777355)

//注意:有时候上传图片失败,是服务器规定还要上传一个Key,如果开发中关于网络这一块出现问题,就多和面试官沟通沟通

public void uploading(View view) {

//图片上传接口地址

String url = "https://www.718shop.com/sell/sell.m.picture.upload.do";

//创建上传文件对象

File file = new File(Environment.getExternalStorageDirectory(), "big.jpg");

//创建RequestBody封装参数

RequestBody fileBody = 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", "big.jpg", fileBody)

.build();

//创建Request

Request request = new Request.Builder()

.url(url)

.post(multipartBody)

.build();

//创建okhttp对象

OkHttpClient okHttpClient = new OkHttpClient.Builder()

.connectTimeout(10, TimeUnit.SECONDS)

.readTimeout(10, TimeUnit.SECONDS)

.writeTimeout(10, TimeUnit.SECONDS)

.build();

//上传完图片,得到服务器反馈数据

okHttpClient.newCall(request).enqueue(new Callback() {

@Override

public void onFailure(Call call, IOException e) {

Log.e("ff", "uploadMultiFile() e=" + e);

}

@Override

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

Log.i("ff", "uploadMultiFile() response=" + response.body().string());

}

});

}

}

activity_main.xml

xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context="com.sn.picture_okhttp.MainActivity">

android:id="@+id/button"

android:onClick="Picture_okhttp_bt"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="下载图片"

android:layout_alignParentTop="true"

android:layout_centerHorizontal="true"

android:layout_marginTop="59dp"/>

android:text="上传图片"

android:onClick="uploading"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/button2"

android:layout_alignParentTop="true"

android:layout_alignLeft="@+id/button"

android:layout_alignStart="@+id/button"/>

android:id="@+id/imageView_okhttp"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentBottom="true"

android:layout_centerHorizontal="true"/>

build.gradle //依赖

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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。