将本地.csv上传到Firebase存储

问题描述：

我正在为学校项目创建一个应用程序，用于从Firebase数据库读取数据，将其转换为.csv文件，然后我想将此文件上传到Firebase存储，以便用户可以共享它只与downloadUrl。将本地.csv上传到Firebase存储

以下是创建csv文件并将其上传到firebase存储的类。请参阅csvUploader。

import android.content.Context; 
import android.net.Uri; 
import android.support.annotation.NonNull; 
import android.util.Log; 
import android.widget.Toast; 

import com.google.android.gms.tasks.OnFailureListener; 
import com.google.android.gms.tasks.OnSuccessListener; 
import com.google.firebase.storage.CancellableTask; 
import com.google.firebase.storage.FirebaseStorage; 
import com.google.firebase.storage.OnProgressListener; 
import com.google.firebase.storage.StorageMetadata; 
import com.google.firebase.storage.StorageReference; 
import com.google.firebase.storage.UploadTask; 

import java.io.BufferedReader; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStreamReader; 

public class CsvHandler { 

private MainActivity mainActivity; 

public CsvHandler(MainActivity mainActivity) { 
    this.mainActivity = mainActivity; 
} 

/** 
* Method that writes a two-dimensional array with strings, to a .csv-file with a specified 
* date as the filename. 
* 
* @param dataArray array to write to a .csv 
* @param callDate specified date that gets passed to the filename 
*/ 
public void writeFileFromArray(String callDate, String[][] dataArray) { 
    String filename = callDate + ".csv"; 
    //Creates the String which will make up the text for the .csv 
    String csvText = ""; 
    //Adds all elements in Array to the string 
    //TODO: Make sure this parses the text correctly to .csv-file format (dependent on Sara & Annies method) 
    for (int i = 0; i < dataArray.length; i++) { 
     for (int j = 0; j < dataArray[0].length; j++) { 
      csvText = csvText + dataArray[i][j]; 
     } 
    } 

    //Creates a FileOutputStream for writing the file to internal storage 
    FileOutputStream outputStream; 
    try { 
     //Opens a FileOutputStream to a file with the specified filename. 
     //Creates file if it doesn't exist. 
     outputStream = mainActivity.openFileOutput(filename, Context.MODE_PRIVATE); 
     //Writes the string to the specified file 
     outputStream.write(csvText.getBytes()); 
     //Closes the FileOutputStream to produce a file 
     outputStream.close(); 
    } catch (FileNotFoundException e) { 
     Toast.makeText(mainActivity, "Internal Error: No such file found", Toast.LENGTH_SHORT).show(); 
    } catch (IOException e) { 
     Toast.makeText(mainActivity, "Internal Error: IOException", Toast.LENGTH_SHORT).show(); 
    } 
} 

/** 
* TESTMETOD 
* TODO: Ta bort innan merge med master. Låt stå till develop 
*/ 
public void readCsvFile(String callDate) { 
    try { 
     String Message; 
     FileInputStream fileInputStream = mainActivity.openFileInput(callDate + ".csv"); 
     InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream); 
     BufferedReader bufferedReader = new BufferedReader(inputStreamReader); 
     StringBuffer stringBuffer = new StringBuffer(); 
     while ((Message = bufferedReader.readLine()) != null) { 
      stringBuffer.append(Message + "\n"); 
     } 
     Toast.makeText(mainActivity, stringBuffer.toString(), Toast.LENGTH_SHORT).show(); 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

/** 
* Method to extract a filePath for a specified date. 
* 
* @param callDate a String with the date to return a filepath for 
* @return the filepath for the specified date 
*/ 
public String getFilePath(String callDate) { 
    String filePath = mainActivity.getFilesDir().getAbsolutePath() + callDate + ".csv"; 
    Log.e("LOG", "Output from getFilePath " + filePath); 
    return filePath; 
} 


public void csvUploader(String filePath, final String callDate) { 
    StorageReference mStorageReference = FirebaseStorage.getInstance().getReference(); 
    Log.e("LOG", "Entering CSVUPLOADER"); 
    Uri file = Uri.fromFile(new File(filePath)); 
    Log.e("csvUploader Uri File:", filePath.toString()); 

    // Create the file metadata 
    StorageMetadata metadata = new StorageMetadata.Builder().setContentType("text/csv").build(); 
    Log.e("LOG","Metadata: " + metadata.toString()); 

    // Upload file and metadata to the path 'reports/date.csv' 
    CancellableTask uploadTask = mStorageReference.child("reports/" + file.getLastPathSegment()).putFile(file, metadata); 


    uploadTask.addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() { 
     @Override 
     public void onProgress(UploadTask.TaskSnapshot taskSnapshot) { 
      double progress = (100.0 * taskSnapshot.getBytesTransferred())/taskSnapshot.getTotalByteCount(); 
      //System.out.println("Upload is " + progress + "% done"); 
     } 
    }).addOnFailureListener(new OnFailureListener() { 
     @Override 
     public void onFailure(@NonNull Exception exception) { 
      // Handle unsuccessful uploads 
      Log.e("LOG", "Unsucessfull in CSVUPLOADER"); 
     } 
    }).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() { 
     @Override 
     public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) { 
      // Handle successful uploads on complete 
      //Uri downloadUrl = taskSnapshot.getMetadata().getDownloadUrl(); 
      //mainActivity.setDownloadLink(downloadUrl); 
      Log.e("LOG", "Successfull in CSVUPLOADER"); 
      mainActivity.getUrlAsync(callDate); 
     } 
    }); 
}

}

这其中大部分都是从firebase.google.com的例子代码，但我不明白这一点的工作。

日志： E/LOG：从getFilePath输出：/data/user/0/com.example.eliasvensson.busify/files2016-05-18.csv E/LOG：输入CSVUPLOADER E/LOG：元数据：[email protected] E/LOG：在CSVUPLOADER中无法使用

什么错？我收集我“储存”我的存储桶上的路径，然后将该文件放置在那个地方。那是对的吗？

任何帮助，将不胜感激。

答

这一切实际上几乎工作。

文件路径是错误的，希望 /data/user/0/com.example.eliasvensson.busify时outputing /data/user/0/com.example.eliasvensson.busify/files2016-05-18.csv /files/2016-05-18.csv（注意文件和日期之间的斜线）

将本地.csv上传到Firebase存储

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