相册浏览图片上传服务

﹏ヽ暗。殇╰゛Y 2022-09-14 11:20 219阅读 0赞

1 权限

基本的用户权限

<uses-permission android:name="android.permission.READ\_EXTERNAL\_STORAGE" /> <uses-permission android:name="android.permission.WRITE\_EXTERNAL\_STORAGE"/> <uses-permission android:name="android.permission.INTERNET" />

应用权限

<application
        android:allowBackup="true"
        android:usesCleartextTraffic="true"
        android:requestLegacyExternalStorage="true"   //没有此权限，则总是提示文件无法找到错误

服务器设置上传文件大小限制

在web.config文件中设置

<system.web>  
  
  
<httpRuntime maxRequestLength="1048576" executionTimeout="3600" />

<customErrors mode="On" defaultRedirect="Error.aspx">  
<error statusCode="500" redirect="Error.aspx"/>  
<error statusCode="403" redirect="Error.aspx"/>  
<error statusCode="404" redirect="Error.aspx"/>  
<error statusCode="400" redirect="Error.aspx"/>  
</customErrors>

</system.web>

2 绝对路径获取

/**
         * Try to return the absolute file path from the given Uri
         *
         * @param context
         * @param uri
         * @return the file path or null
         */
        public static String getRealFilePath( final Context context, final Uri uri ) {
            if ( null == uri ) return null;
            final String scheme = uri.getScheme();
            String data = null;
            if ( scheme == null )
                data = uri.getPath();
            else if ( ContentResolver.SCHEME_FILE.equals( scheme ) ) {
                data = uri.getPath();
            } else if ( ContentResolver.SCHEME_CONTENT.equals( scheme ) ) {
                Cursor cursor = context.getContentResolver().query( uri, new String[] { MediaStore.Images.ImageColumns.DATA }, null, null, null );
                if ( null != cursor ) {
                    if ( cursor.moveToFirst() ) {
                        int index = cursor.getColumnIndex( MediaStore.Images.ImageColumns.DATA );
                        if ( index > -1 ) {
                            data = cursor.getString( index );
                        }
                    }
                    cursor.close();
                }
            }
            return data;
        }

3 异步线程

//图片上传异步线程
        private class WxpTransferAlbumPicToServerTask extends AsyncTask<String, Integer, String> {
    
            @Override
            protected void onPostExecute(String result) {
                //最终结果的显示
                //mTvProgress.setText(result);
                tx.setText(result);
            }
    
            @Override
            protected void onPreExecute() {
                //开始前的准备工作
                //mTvProgress.setText("loading...");
                tx.setText("loading .....");
            }
    
            @Override
            protected void onProgressUpdate(Integer... values) {
                //显示进度
                // mPgBar.setProgress(values[0]);
                // mTvProgress.setText("loading..." + values[0] + "%");
                tx.setText("loading:"+String.valueOf(values[0])+"%");
            }
    
            @Override
            protected String doInBackground(String... params)
            {
                //这里params[0]和params[1]是execute传入的两个参数
                String filePath = params[0];
                String uploadUrl = params[1];
    
                //下面即手机端上传文件的代码
                String end = "\r\n";
                String twoHyphens = "--";
                String boundary = "******";
                try {
                    URL url = new URL(uploadUrl);
                    HttpURLConnection httpURLConnection = (HttpURLConnection) url
                            .openConnection();
                    httpURLConnection.setDoInput(true);
                    httpURLConnection.setDoOutput(true);
                    httpURLConnection.setUseCaches(false);
                    httpURLConnection.setRequestMethod("POST");
                    httpURLConnection.setConnectTimeout(6 * 1000);
                    httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
                    httpURLConnection.setRequestProperty("Charset", "UTF-8");
                    httpURLConnection.setRequestProperty("Content-Type",
                            "multipart/form-data;boundary=" + boundary);
    
                    DataOutputStream dos = new DataOutputStream(httpURLConnection
                            .getOutputStream());
                    dos.writeBytes(twoHyphens + boundary + end);
                    dos
                            .writeBytes("Content-Disposition: form-data; name=\"file\"; filename=\""
                                    + filePath.substring(filePath.lastIndexOf("/") + 1)
                                    + "\"" + end);
                    dos.writeBytes(end);
    
                    //获取文件总大小
                    FileInputStream fis = new FileInputStream(filePath);
                    long total = fis.available();
                    byte[] buffer = new byte[8192]; // 8k
                    int count = 0;
                    int length = 0;
                    while ((count = fis.read(buffer)) != -1) {
                        dos.write(buffer, 0, count);
                        //获取进度，调用publishProgress()
                        length += count;
                        publishProgress((int) ((length / (float) total) * 100));
                        //这里是测试时为了演示进度,休眠500毫秒，正常应去掉
                        //Thread.sleep(500);
                    }
                    fis.close();
                    dos.writeBytes(end);
                    dos.writeBytes(twoHyphens + boundary + twoHyphens + end);
                    dos.flush();
    
                    InputStream is = httpURLConnection.getInputStream();
                    InputStreamReader isr = new InputStreamReader(is, "utf-8");
                    BufferedReader br = new BufferedReader(isr);
                    @SuppressWarnings("unused")
                    String result = br.readLine();
                    dos.close();
                    is.close();
                    return "上传成功";
                } catch (Exception e)
                {
                    e.printStackTrace();
                     return "上传失败"+e.toString();
                }
    
            }
        }
        //

4 相册图片选取并上传

String[] mPermissionList = new String[]{
                Manifest.permission.WRITE_EXTERNAL_STORAGE,
                Manifest.permission.READ_EXTERNAL_STORAGE,
                Manifest.permission.ACCESS_NETWORK_STATE};
        public static final int REQUEST_PICK_IMAGE = 11101;
        //文件上传异步类
        String STR_REQUESTURL="http://x.x.x.x/Default4.aspx";
        String mCurrentPhotoPath="";
    
        private ImageView mShowImg;
        private TextView  tx;
        private Button bt;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            mShowImg = (ImageView) findViewById(R.id.imageView);
            tx = (TextView) findViewById(R.id.txt);
            bt=(Button) findViewById(R.id.button);
    
            mShowImg.setImageResource(R.mipmap.ic_launcher);
            bt.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {               
                    openPhotoAlbum();
                }
            });
    
        }
    
        @Override
        public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
            switch (requestCode) {
                case 100:
                    boolean writeExternalStorage = grantResults[0] == PackageManager.PERMISSION_GRANTED;
                    boolean readExternalStorage = grantResults[1] == PackageManager.PERMISSION_GRANTED;
    
                    if (grantResults.length > 0 && writeExternalStorage && readExternalStorage) {
                        getImage();
                    } else {
                        Toast.makeText(this, "请设置必要权限", Toast.LENGTH_SHORT).show();
                    }
    
                    break;
            }
        }
    
        private void getImage() {
            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
                startActivityForResult(new Intent(Intent.ACTION_GET_CONTENT).setType("image/*"),
                        REQUEST_PICK_IMAGE);
            } else {
                Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
                intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
                startActivityForResult(intent, REQUEST_PICK_IMAGE);
            }
        }
    
        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            if (resultCode == Activity.RESULT_OK) {
                switch (requestCode) {
                    case REQUEST_PICK_IMAGE:
                        if (data != null) {
                            String realPathFromUri=getRealFilePath(this,data.getData());
                            tx.setText(realPathFromUri);
                            //显示图片
                            mShowImg.setImageURI(data.getData());
    
                            //上传文件
                            WxpTransferAlbumPicToServerTask mTask = new WxpTransferAlbumPicToServerTask();
                            mTask.execute(realPathFromUri, STR_REQUESTURL);
    
                            Toast.makeText(this, "success", Toast.LENGTH_SHORT).show();
    
                        } else {
                            Toast.makeText(this, "图片损坏，请重新选择", Toast.LENGTH_SHORT).show();
                        }
                        break;
                }
            }
        }
    
        //
        //打开相册
        public void openPhotoAlbum() {
            ActivityCompat.requestPermissions(MainActivity.this, mPermissionList, 100);
        }

5 ASPX服务器端保存代码

其他复杂的都是错误的，核心功能一行代码搞定

protected void Page_Load(object sender, EventArgs e)
        {
            string FileSaveDisk = "D:\\phpstudy_pro\\WWW\\WebSite2\\WxpPic";
            string imgFile = DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
            string filePath = FileSaveDisk + "\\" + imgFile;
    
            //测试代码
            if (!IsPostBack)
            {           
                if (this.Request.Files.Count > 0)
                {
                    HttpPostedFile file = this.Request.Files.Get(0);
                    try
                    {
                        file.SaveAs(filePath);
                        Response.Write("success");
                    }
                    catch
                    {
                        Response.Write("error");
                    }
                }
    
            }
            return;
       }