saveByRandomAccessFile(文件保存工具类)

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.RandomAccessFile;


public class FileUtil {

    /**
     * @Title: saveByRandomAccessFile 
     * @Description: 使用RandomAccessFile写入文件
     * @param outPath 存入的目标地址，包括文件名称扩展名
     * @param tempFile 源文件
     * @throws IOException
     */
    public static void saveByRandomAccessFile(String outPath, File tempFile)
            throws IOException {
        RandomAccessFile raFile = null;
        BufferedInputStream inputStream = null;
        try {
            File dirFile = new File(outPath);
            if (!dirFile.getParentFile().exists()) {
                dirFile.getParentFile().mkdirs();
            }
            // 以读写的方式打开目标文件
            raFile = new RandomAccessFile(dirFile, "rw");
            raFile.seek(raFile.length());
            inputStream = new BufferedInputStream(new FileInputStream(tempFile));
            byte[] buf = new byte[1024];
            int length = 0;
            while ((length = inputStream.read(buf)) != -1) {
                raFile.write(buf, 0, length);
            }
        } catch (Exception e) {
            throw new IOException(e.getMessage());
        } finally {
            try {
                if (inputStream != null) {
                    inputStream.close();
                }
                if (raFile != null) {
                    raFile.close();
                }
            } catch (Exception e) {
                throw new IOException(e.getMessage());
            }
        }
    }
}