如果要操作任何类型的文件，请不要认为它们包含文本数据，而应将它们视为包含字节的二进制文件。使用输入和输出流读取和写入二进制文件。
这是一个读取文件并将其拆分为1024个字节的方法的示例，这些字节写入N个输出文件：
import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;public class FileSplit { public static void main(String[] args) throws IOException { new FileSplit().splitFile(new File(args[0])); } private void splitFile(File file) throws IOException { FileInputStream fis = new FileInputStream(file); try { byte[] buffer = new byte[1024]; // remaining is the number of bytes to read to fill the buffer int remaining = buffer.length; // block number is incremented each time a block of 1024 bytes is read //and written int blockNumber = 1; while (true) { int read = fis.read(buffer, buffer.length - remaining, remaining); if (read >= 0) { // some bytes were read remaining -= read; if (remaining == 0) { // the buffer is full writeBlock(blockNumber, buffer, buffer.length - remaining); blockNumber++; remaining = buffer.length; } } else { // the end of the file was reached. If some bytes are in the buffer // they are written to the last output file if (remaining < buffer.length) { writeBlock(blockNumber, buffer, buffer.length - remaining); } break; } } } finally { fis.close(); } } private void writeBlock(int blockNumber, byte[] buffer, int length) throws IOException { FileOutputStream fos = new FileOutputStream("output_" + blockNumber + ".dat"); try { fos.write(buffer, 0, length); } finally { fos.close(); } }}
