import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;

/** I/O工具   以流的形式獲取*/
public class IOUtil {

  private static final int DEFAULT_BUFFER_SIZE = 8192;

  private IOUtil() {}

  /**
   * 轉(zhuǎn)換輸入流為字節(jié)數(shù)組
   *
   * @param inputStream 輸入流
   * @return 字節(jié)數(shù)組
   * @throws IOException 讀取字節(jié)失敗血当、關(guān)閉流失敗等
   */
  public static byte[] toByteArray(InputStream inputStream) throws IOException {
    ByteArrayOutputStream buffer = new ByteArrayOutputStream();

    int nRead;
    byte[] data = new byte[DEFAULT_BUFFER_SIZE];
    while ((nRead = inputStream.read(data, 0, data.length)) != -1) {
      buffer.write(data, 0, nRead);
    }

    return buffer.toByteArray();
  }

  /**
   * 轉(zhuǎn)換輸入流為字符串
   *
   * @param inputStream 輸入流
   * @return UTF-8編碼的字符串
   * @throws IOException 讀取字節(jié)失敗澜躺、關(guān)閉流失敗等
   */
  public static String toString(InputStream inputStream) throws IOException {
    return new String(toByteArray(inputStream), StandardCharsets.UTF_8);
  }

  /**
   * 從文件路徑中讀取字符串
   *
   * @param path 文件路徑
   * @return UTF-8編碼的字符串
   * @throws IOException 讀取字節(jié)失敗求妹、關(guān)閉流失敗等
   */
  public static String loadStringFromPath(String path) throws IOException {
    try (InputStream inputStream = Files.newInputStream(Paths.get(path))) {
      return toString(inputStream);
    }
  }
}

// 文件讀取

public class Files {


    /**
     * @param fileName:
     * @return byte  jdk 7之后寫法
     * @author Administrator
     * @description TODO 以byte【】的方式讀取文件
     * @date 2023/2/14 0014 14:17
     */
    public static byte[] readFileByBytes(String fileName) throws IOException {
        try (InputStream in = new BufferedInputStream(new FileInputStream(fileName)); ByteArrayOutputStream out = new ByteArrayOutputStream()) {
            byte[] bytes = new byte[in.available()];
            for (int i = 0; (i = in.read(bytes)) != -1; ) {
                out.write(bytes, 0, i);
            }
            return out.toByteArray();
        }
    }


    /**
     * @param fileName:
     * @param bytes:
     * @param append:
     * @return void
     * @author Administrator
     * @description TODO 向文件寫入byte【】
     * @date 2023/2/14 0014 14:27
     */
    public static void writeFileByBytes(String fileName, byte[] bytes, boolean append) throws IOException {
        try (OutputStream out = new BufferedOutputStream(new FileOutputStream(fileName, append))) {
            out.write(bytes);
        }
    }

    public static void writeFileByBytes(String fileName, byte[] bytes) throws IOException {
        writeFileByBytes(fileName, bytes, false);
      //  IntStream.range(0,3).forEach();
    }

}