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android应用程序写问题

fileoutputstream android

1

juniano · 技术社区 · 16 年前

private void saveImage(String fullPath) {
  File imgFile = new File(fullPath);
  try {
    if(imgFile.exists()) imgFile.delete();

    URL url = new URL(this.fileURL);
    URLConnection connection = url.openConnection();
    HttpURLConnection httpConnection = (HttpURLConnection)connection;
    InputStream in = httpConnection.getInputStream();

    FileOutputStream fos = new FileOutputStream(imgFile);
    int n = 0;
    while((n = in.read()) != -1) {
        fos.write(n);
    }
    fos.flush();
    fos.close();
    in.close();

  }
  catch(IOException e) {
    imgFile.delete();
    Log.d("IOException Thrown", e.toString());
  }
}

当我检查写入的文件时,它总是在写入到4576字节时被卡住。(原始图像大小超过150k) 在这个问题上有人能帮我吗?

2 回复 | 直到 16 年前

1

Jorgesys 16 年前

private void saveImage(String fullPath) {
  File imgFile = new File(fullPath);
  try {
    if(imgFile.exists()) imgFile.delete();

/**    URL url = new URL(this.fileURL);
    URLConnection connection = url.openConnection();
    HttpURLConnection httpConnection = (HttpURLConnection)connection;
    InputStream in = httpConnection.getInputStream();

    FileOutputStream fos = new FileOutputStream(imgFile);
    int n = 0;
    while((n = in.read()) != -1) {
        fos.write(n);
    }
    fos.flush();
    fos.close();
    in.close();***/

 FileOutputStream fos = new FileOutputStream(imgFile);

URL url = new URL(this.fileUR);
Object content = url.getContent();
InputStream in =  (InputStream) content;
Bitmap bitmap = BitmapFactory.decodeStream(in);
bitmap.compress(CompressFormat.JPEG,80, fos);
fos.flush();
fos.close();
in.close();


  }
  catch(IOException e) {
    imgFile.delete();
    Log.d("IOException Thrown", e.toString());
  }
}

2

Jorgesys 16 年前

嗨Juniano回答你的第二个问题,是的,你可以使用while循环,但你还需要两件事。

  URL url = new URL(this.fileURL);
  URLConnection connection = url.openConnection();
  HttpURLConnection httpConnection = (HttpURLConnection)connection;

  InputStream in = httpConnection.getInputStream();

   BufferedInputStream myBis = new BufferedInputStream(in);

1) 创建一个ByteArrayBuffer来存储输入流

     ByteArrayBuffer myBABuffer = new ByteArrayBuffer(50);
                              int current = 0;
                              while ((current = myBis.read()) != -1) {
                                      myBABuffer.append((byte) current);
                              }    

    FileOutputStream fos = new FileOutputStream(imgFile);

2) 使用存储的字节创建图像。

fos.write(myBABuffer.toByteArray());    
fos.flush();
fos.close();
in.close();

乔吉斯