Java:Java解决方案：如何正确使用UTF8StreamReader？发生错误的原因是：java.lang.ArrayIndexOutOfBoundsException:2048

代码如下：

public static void mergeAllFilesJavolution()throws FileNotFoundException, IOException {
    String fileDir = "C:\\TestData\\w12";
    File dirSrc = new File(fileDir);
    File[] list = dirSrc.listFiles();
    long start = System.currentTimeMillis();
    for(int j=0; j<list.length; j++){
        int chr;
        String srcFile = list[j].getPath();
        String outFile = fileDir + "\\..\\merged.txt";
        UTF8StreamReader inFile=new UTF8StreamReader().setInput(new FileInputStream(srcFile));
        UTF8StreamWriter outPut=new UTF8StreamWriter().setOutput(new FileOutputStream(outFile, true)); 
        while((chr=inFile.read()) != -1) {
            outPut.write(chr);
        }
        outPut.close();
        inFile.close();
    }
    System.out.println(System.currentTimeMillis()-start);
}

问题：如何在创建UTF8StreamReader时指定_字节的正确容量

我尝试了File.length（）但是它返回了long类型（我认为这是正确的，因为我期望文件的大小很大，但是构造函数只接收int类型）

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任何关于正确方向的指导都是值得赞赏的。

似乎还没有人经历过上述情况

无论如何，我尝试了其他解决方案，没有使用上面的类（UTF8StreamReader），而是使用ByteBuffer（UTF8ByteBufferReader）。它比StreamReader快得难以置信

/**
 * Holds the bytes buffer.
 */
private final byte[] _bytes;

/**
 * Creates a UTF-8 reader having a byte buffer of moderate capacity (2048).
 */
public UTF8StreamReader() {
    _bytes = new byte[2048];
}

/**
 * Reads a single character.  This method will block until a character is
 * available, an I/O error occurs or the end of the stream is reached.
 *
 * @return the 31-bits Unicode of the character read, or -1 if the end of
 *         the stream has been reached.
 * @throws IOException if an I/O error occurs.
 */
public int read() throws IOException {
    byte b = _bytes[_start];
    return ((b >= 0) && (_start++ < _end)) ? b : read2();
}

/**
 * Creates a UTF-8 reader having a byte buffer of specified capacity.
 * 
 * @param capacity the capacity of the byte buffer.
 */
public UTF8StreamReader(int capacity) {
    _bytes = new byte[capacity];
}