Android客户端与Python服务器端通信之上传图片

Posted 2020-11-22 glam

继上篇成功的与服务器端通信上之后，我现在需要将安卓本地的图片上传到服务端。服务端接收图片存下来。

参考：https://blog.csdn.net/qq_26906345/article/details/91045074

Android客户端：

点击按钮会将文件上传到服务器，图片的地址我暂时是写死的。

 

 

 服务器端：

接收到图片存储到写好的位置

相关代码如下：

Android客户端：由于布局文件只有一个按钮，故不在此展出。

MainActivity.java：主要就是设置了对按钮的监听。

package com.example.vesper.uploadpic;

import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import java.io.File;

public class MainActivity extends AppCompatActivity {
    private Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button=findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                File f=new File(Environment.getExternalStorageDirectory().getPath()+"/mahc/image/1573125250817.jpg");
                try {
                    ImageUpload.run(f);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });

    }
}

View Code

ImageUpload.java：开启线程上传图片。

 1 package com.example.vesper.uploadpic;
 2 
 3 import java.io.File;
 4 import java.io.IOException;
 5 
 6 import okhttp3.MediaType;
 7 import okhttp3.MultipartBody;
 8 import okhttp3.OkHttpClient;
 9 import okhttp3.Request;
10 import okhttp3.RequestBody;
11 import okhttp3.Response;
12 
13 public class ImageUpload{
14 
15     private static final MediaType MEDIA_TYPE_JPG = MediaType.parse("image/jpg");
16     private static final OkHttpClient client = new OkHttpClient();
17     public static void run(File f) throws Exception {
18         final File file=f;
19         new Thread() {
20             @Override
21             public void run() {
22                 //子线程需要做的工作
23                 RequestBody requestBody = new MultipartBody.Builder()
24                         .setType(MultipartBody.FORM)
25                         .addFormDataPart("file","1.jpg",
26                                 RequestBody.create(MEDIA_TYPE_JPG, file))
27                         .build();
28                 //设置为自己的ip地址
29                 Request request = new Request.Builder()
30                         .url("http://192.168.xxx.xxx:5000/upload")
31                         .post(requestBody)
32                         .build();
33                 try(Response response = client.newCall(request).execute()){
34                     if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
35 
36                     System.out.println(response.body().string());
37                 } catch (IOException e) {
38                     e.printStackTrace();
39                 }
40             }
41         }.start();
42     }
43 }

View Code

Python服务器端：

uploadserver.py：

 1 #-*-coding:utf-8-*-
 2 from flask import Flask
 3 from flask import request
 4 import cv2
 5 import os
 6 from werkzeug.utils import secure_filename
 7 app = Flask(__name__)
 8 basedir=os.path.abspath(os.path.dirname(__file__))
 9 
10 @app.route(\'/\')
11 def test():
12     return \'服务器正常运行\'
13 
14 #此方法接收图片
15 @app.route(\'/upload\',methods=[\'POST\'])
16 def upload():
17     f = request.files[\'file\']
18     print(\'连接成功\')
19    # 当前文件所在路径
20     basepath = os.path.dirname(__file__)
21     upload_path = os.path.join(basepath, \'1115\', secure_filename(f.filename))
22     # 保存文件
23     f.save(upload_path) 
24     return \'保存成功\'
25 
26 if __name__ == \'__main__\':
27     app.run(host=\'0.0.0.0\')

View Code

遇到的问题：

1.读文件权限要在Manifest.xml中加上：

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

2.在gradle中修改最小SDK为19.