cicada.core.FileUtil Maven / Gradle / Ivy

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package cicada.core;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class FileUtil
{
	/**
	 * 获取项目根目录 默认返回根目录 例如"/tmp/123/ 但有可能存在空格 " 如果运行在jar包里面 返回""
	 * 
	 * @return
	 */
	public static String rootPath()
	{
		try
		{
			String path = FileUtil.class.getClassLoader().getResource("").getPath();
			return path;
		}
		catch (Exception e)
		{
			return "";
		}
	}

	/**
	 * 文件转成bytes[]
	 * 
	 * @param filePath
	 * @return
	 * @throws FileNotFoundException
	 * @throws IOException
	 */
	public static byte[] file2bytes(final String filePath) throws FileNotFoundException, IOException
	{
		File file = new File(filePath);
		if (file != null && file.isFile())
		{
			byte[] bytes = file2bytes(file);
			return bytes;
		}
		return null;
	}

	/**
	 * File 读取byte[]
	 * 
	 * @param file
	 * @return
	 * @throws FileNotFoundException
	 * @throws IOException
	 */
	public static byte[] file2bytes(final File file) throws FileNotFoundException, IOException
	{
		try (FileInputStream fileInputStream = new FileInputStream(file))
		{
			try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(1000))
			{
				byte[] bytes = new byte[1000];
				int n = -1;
				while ((n = fileInputStream.read(bytes)) != -1)
				{
					byteArrayOutputStream.write(bytes, 0, n);
				}
				byte[] buffer = byteArrayOutputStream.toByteArray();
				return buffer;
			}
		}
	}

	/**
	 * 读取文件内容
	 * 
	 * @param filePath
	 * @return
	 * @throws FileNotFoundException
	 * @throws IOException
	 */
	public static String file2string(final String filePath) throws FileNotFoundException, IOException
	{
		File file = new File(filePath);
		if (file != null && file.isFile())
		{
			byte[] bytes = file2bytes(file);
			return new String(bytes);
		}
		return null;
	}

	/**
	 * @param file
	 * @return
	 * @throws FileNotFoundException
	 * @throws IOException
	 */
	public static String file2String(final File file) throws FileNotFoundException, IOException
	{
		if (file != null && file.isFile())
		{
			byte[] bytes = file2bytes(file);
			String result = new String(bytes);
			return result;
		}
		return null;
	}

	/**
	 * byte[] 写入文件
	 * 
	 * @param bytes
	 * @param filePath
	 * @return
	 * @throws FileNotFoundException
	 * @throws IOException
	 */
	public static boolean byte2file(byte[] bytes, final String filePath) throws FileNotFoundException, IOException
	{
		File file = new File(filePath);
		boolean result = byte2file(bytes, file);
		return result;
	}

	/**
	 * 字符串写入文件
	 * 
	 * @param content
	 * @param file
	 * @return
	 * @throws FileNotFoundException
	 * @throws IOException
	 */
	public static boolean string2file(String content, File file) throws FileNotFoundException, IOException
	{
		byte[] bytes = content.getBytes();
		boolean result = byte2file(bytes, file);
		return result;
	}

	private static boolean byte2file(byte[] bytes, File file) throws FileNotFoundException, IOException
	{
		try (OutputStream outputStream = new FileOutputStream(file))
		{
			try (BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(outputStream))
			{
				bufferedOutputStream.write(bytes);
				return true;
			}
		}
	}
}