Question

我目前正在尝试编写一个读取压缩文件的程序，该文件以位或0和1写入，并将它们转换为0和1的字符串。

学校提供了一个类和方法来读取1位并将其转换为字符char。因此，要读取并将一位转换为char，我需要做的就是输入我的代码：

char oneBit = inputFile.readBit();

在我的主要方法中。

如何让我的程序读取压缩文件中的每一位并将它们转换为char？使用.readBit方法？如何将所有char 0和1转换为0和1的字符串？

readBit方法：

public char readBit() {
    char c = 0;

    if (bitsRead == 8)
        try {
            if (in.available() > 0) { // We have not reached the end of the
                                        // file
                buffer = (char) in.read();
                bitsRead = 0;
            } else
                return 0;
        } catch (IOException e) {
            System.out.println("Error reading from file ");
            System.exit(0); // Terminate the program
        }

    // return next bit from the buffer; bit is converted first to char
    if ((buffer & 128) == 0)
        c = '0';
    else
        c = '1';
    buffer = (char) (buffer << 1);
    ++bitsRead;

    return c;
}

其中in是输入文件。

Answer 1

尝试使用此resource

示例实施。

public class BitAnswer {

    final static int RADIX = 10;

    public static void main(String[] args) {
        BitInputStream bis = new BitInputStream("<file_name>");
        int result = bis.readBit();
        while( result != -1 ) {
            System.out.print(Character.forDigit(result, RADIX));
            result = bis.readBit();
        }

        System.out.println("\nAll bits read!");
    }
}

Answer 2

public  void compress(){
        String inputFileName = "c://tmp//content.txt";
        String outputFileName = "c://tmp//compressedContent.txt";
        FileOutputStream fos = null; 
        StringBuilder sb = new StringBuilder();
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        OutputStream outputStream= null;    
        try (BufferedReader br = new BufferedReader(new FileReader(new File(inputFileName)))) {
            String line;
            while ((line = br.readLine()) != null) {
                sb.append(line);
            }
            outputStream = new  DeflaterOutputStream(byteArrayOutputStream); // GZIPOutputStream(byteArrayOutputStream) - use if you want unix .gz format
            outputStream.write(sb.toString().getBytes());
            String compressedText = Base64.getEncoder().encodeToString(byteArrayOutputStream.toByteArray());
            fos=new FileOutputStream(outputFileName);
            fos.write(compressedText.getBytes());
            System.out.println("done compress");
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try{
                if (outputStream != null) {
                    outputStream.close();
                }
                if (byteArrayOutputStream != null) {
                    byteArrayOutputStream.close();
                }
                if(fos != null){
                    fos.close();
                }
            }catch (Exception e) {
                    e.printStackTrace();
            }
            System.out.println("closed streams !!! ");
        }   
    }

Java压缩.txt文件

2 个答案: