[移动开发]上传图片到服务器（单张，多张）

牛工写的后台接口

xutils3上传
准备

implementation 'org.xutils:xutils:3.9.0'

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

public class MyApp extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        x.Ext.init(this);
        x.Ext.setDebug(BuildConfig.DEBUG); // 是否输出debug日志, 开启debug会影响性能.
    }
}

上传

package com.example.myapplication;

import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import org.xutils.ex.HttpException;
import org.xutils.http.RequestParams;
import org.xutils.x;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    ProgressDialog dialogShibie;
    List<File> fileArrayList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        fileArrayList = new ArrayList<>();
        dialogShibie = new ProgressDialog(this);
        upload();
    }
    public  List<File> saveBitmap() {
        Log.e("wy", "开始保存");
        //生成一个文件，存储我们将来拍照的照片
//        String sdPath = Environment.getExternalStorageDirectory().getAbsolutePath()+"/a/" ;
        String sdPath = getExternalFilesDir(Environment.DIRECTORY_PICTURES) + "/a/";
//        String sdPath = "/mnt/sdcard/Internal Memory" ;
//        File file = new File(sdPath);
//        Log.e("wy", "绝对文件路径: " + file.getAbsoluteFile());
//        Log.e("wy", "文件名: " + file.getName());
//        if (!file.exists()) {
//            file.mkdirs();
//            Log.e("wy", "创建文件夹,路径：" + file.getPath());
//        }
//        String mFileName = System.currentTimeMillis() + ".jpg";
        String mFileName = "a.jpg";
        String mFileName1 = "b.jpg";
        Log.e("wy", "保存文件名称: " + mFileName);
        File f = new File(sdPath, mFileName);
        File f2 = new File(sdPath, mFileName1);
        fileArrayList.clear();
        fileArrayList.add(f);
        fileArrayList.add(f2);


        return fileArrayList;
    }


    private void upload() {
        //拍照获取的图片
        List<File> mFile = saveBitmap();
//        存到本地的图片
//        String sdPath = getExternalFilesDir(Environment.DIRECTORY_PICTURES) + "/a/test.jpg";
//        File mFile=new File(sdPath);

        dialogShibie.setTitle("上传中");
        dialogShibie.show();

//        Log.e("wy1", "开始上传图片的时间: " + TimeUtil.stampToDate(System.currentTimeMillis() + ""));
        RequestParams params = new RequestParams("http://192.168.176.119/uploadFile");
//        params.setConnectTimeout(5000);
        // 有上传文件时使用multipart表单, 否则上传原始文件流.
        params.setMultipart(true);
        // 上传文件方式 2  /mnt/internal_sd/FtrendCrashLog/th.jpg
        params.addBodyParameter("files", mFile);
//        params.addBodyParameter("file", bitmapUse);
        Log.e("wy", "params:   " + params);
        org.xutils.common.Callback.Cancelable cancelable
                = x.http().post(params, new org.xutils.common.Callback.CommonCallback<String>() {
            @Override
            public void onSuccess(String result) {
                Log.e("wy1", "上传图片成功: " );
                dialogShibie.dismiss();
//                Toast.makeText(x.app(), "查到任务ID", Toast.LENGTH_SHORT).show();
                Log.e("wy", "result: " + result);



            }


            @Override
            public void onError(Throwable ex, boolean isOnCallback) {
                //Toast.makeText(x.app(), ex.getMessage(), Toast.LENGTH_LONG).show();
                if (ex instanceof HttpException) { // 网络错误
                    HttpException httpEx = (HttpException) ex;
                    int responseCode = httpEx.getCode();
                    String responseMsg = httpEx.getMessage();
                    String errorResult = httpEx.getResult();
                    Log.e("wy", "responseCode    "   +responseCode);
                    if (responseCode == 404) {
                        dialogShibie.dismiss();
                        Toast.makeText(x.app(), "ip地址错误", Toast.LENGTH_LONG).show();
                    }
                    // ...
                } else { // 其他错误
                    // ...
                }
//                dialogShibie.dismiss();
                Log.e("wy", "请求上传图片地址错误: " + ex.getMessage());
//                Toast.makeText(x.app(), ex.getMessage(), Toast.LENGTH_LONG).show();
            }

            @Override
            public void onCancelled(CancelledException cex) {
                Toast.makeText(x.app(), "cancelled", Toast.LENGTH_LONG).show();
            }

            @Override
            public void onFinished() {
//                dialog.dismiss();
                Log.e("wy", "本次请求完全结束 ");

            }
        });
    }
}