将文件读/写到内部私有存储

发布于 2024-10-20 16:11:50 字数 694 浏览 2 评论 0原文

我正在将应用程序从 Symbian/iPhone 移植到 Android，其中一部分是将一些数据保存到文件中。我使用 FileOutputStream 将文件保存到私有文件夹 /data/data/package_name/files 中：

FileOutputStream fos = iContext.openFileOutput( IDS_LIST_FILE_NAME, Context.MODE_PRIVATE ); 
fos.write( data.getBytes() ); 
fos.close();

现在我正在寻找一种加载它们的方法。我正在使用 FileInputStream，但它允许我逐字节读取文件，这是相当低效的：

int ch;
StringBuffer fileContent = new StringBuffer("");
FileInputStream fis = iContext.openFileInput( IDS_LIST_FILE_NAME );
while( (ch = fis.read()) != -1)
  fileContent.append((char)ch);
String data = new String(fileContent);

所以我的问题是如何使用更好的方式读取文件？

原文

I'm porting the application from Symbian/iPhone to Android, part of which is saving some data into file. I used the FileOutputStream to save the file into private folder /data/data/package_name/files:

FileOutputStream fos = iContext.openFileOutput( IDS_LIST_FILE_NAME, Context.MODE_PRIVATE ); 
fos.write( data.getBytes() ); 
fos.close();

Now I am looking for a way how to load them. I am using the FileInputStream, but it allows me to read the file byte by byte, which is pretty inefficient:

int ch;
StringBuffer fileContent = new StringBuffer("");
FileInputStream fis = iContext.openFileInput( IDS_LIST_FILE_NAME );
while( (ch = fis.read()) != -1)
  fileContent.append((char)ch);
String data = new String(fileContent);

So my question is how to read the file using better way?

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命硬 2024-10-27 16:11:50

使用 FileInputStream.read(byte[]) 您可以更有效地阅读。

一般来说，您不希望将任意大小的文件读入内存。

大多数解析器将采用InputStream。也许您可以让我们知道您如何使用该文件，我们可以建议更合适的方案。

以下是如何使用 read() 的字节缓冲区版本：

byte[] buffer = new byte[1024];
int length;
while ((length = fis.read(buffer)) != -1) {
    fileContent.append(new String(buffer));
}

Using FileInputStream.read(byte[]) you can read much more efficiently.

In general you don't want to be reading arbitrary-sized files into memory.

Most parsers will take an InputStream. Perhaps you could let us know how you're using the file and we could suggest a better fit.

Here is how you use the byte buffer version of read():

byte[] buffer = new byte[1024];
int length;
while ((length = fis.read(buffer)) != -1) {
    fileContent.append(new String(buffer));
}

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土豪我们做朋友吧 2024-10-27 16:11:50

这并不是真正特定于 Android 的，而是更面向 Java 的。

如果您更喜欢面向行的读取，则可以将 FileInputStream 包装在 InputStreamReader 中，然后将其传递给 BufferedReader。 BufferedReader 实例有一个 readLine() 方法，您可以使用它来逐行读取。

InputStreamReader in = new InputStreamReader(fis);
BufferedReader br = new BufferedReader(in);
String data = br.readLine()

或者，如果您使用 Google Guava 库，则可以使用字节流：

String data = new String(ByteStreams.toByteArray(fis));

This isn't really Android-specific but more Java oriented.

If you prefer line-oriented reading instead, you could wrap the FileInputStream in an InputStreamReader which you can then pass to a BufferedReader. The BufferedReader instance has a readLine() method you can use to read line by line.

InputStreamReader in = new InputStreamReader(fis);
BufferedReader br = new BufferedReader(in);
String data = br.readLine()

Alternatively, if you use the Google Guava library you can use the convenience function in ByteStreams:

String data = new String(ByteStreams.toByteArray(fis));

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濫情▎り 2024-10-27 16:11:50

//写入

String data = "Hello World";
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput(FILENAME,     
Context.MODE_PRIVATE));
outputStreamWriter.write(data);
outputStreamWriter.close();

//读取

String ret = "";

    try {
        InputStream inputStream = openFileInput(FILENAME);

        if ( inputStream != null ) {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();

            while ( (receiveString = bufferedReader.readLine()) != null ) {
                stringBuilder.append(receiveString);
            }

            inputStream.close();
            ret = stringBuilder.toString();
        }
    }
    catch (FileNotFoundException e) {
        Log.e(TAG, "File not found: " + e.toString());
    } catch (IOException e) {
        Log.e(TAG, "Can not read file: " + e.toString());
    }

    return ret;
}

//to write

String data = "Hello World";
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput(FILENAME,     
Context.MODE_PRIVATE));
outputStreamWriter.write(data);
outputStreamWriter.close();

//to read

String ret = "";

    try {
        InputStream inputStream = openFileInput(FILENAME);

        if ( inputStream != null ) {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();

            while ( (receiveString = bufferedReader.readLine()) != null ) {
                stringBuilder.append(receiveString);
            }

            inputStream.close();
            ret = stringBuilder.toString();
        }
    }
    catch (FileNotFoundException e) {
        Log.e(TAG, "File not found: " + e.toString());
    } catch (IOException e) {
        Log.e(TAG, "Can not read file: " + e.toString());
    }

    return ret;
}

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