caimei-mall-admin/src/main/java/com/caimei/utils/FileUtil.java

package com.caimei.utils;

import org.apache.commons.io.FileUtils;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class FileUtil {
	public final static Map<String, String> FILE_TYPE_MAP = new HashMap<String, String>();

	static {
		getAllFileType(); // 初始化文件类型信息
	}

	/**
	 * Created on 2013-1-21
	 * <p>
	 * Discription:[getAllFileType,常见文件头信息]
	 * 
	 * @author:shaochangfu
	 */
	private static void getAllFileType() {
		FILE_TYPE_MAP.put("jpg", "FFD8FF"); // JPEG (jpg)
		FILE_TYPE_MAP.put("png", "89504E47");// PNG (png)
		FILE_TYPE_MAP.put("gif", "47494638");// GIF (gif)
		FILE_TYPE_MAP.put("bmp", "424D"); // Windows Bitmap (bmp)
		FILE_TYPE_MAP.put("zip", "504B0304");// zip 压缩文件
	}

	public FileUtil() {
	}

	/**
	 * 把from路径下的文件拷贝到to路径下
	 * 
	 * @param from
	 * @param to
	 * @throws Exception
	 */
	public static void copy(String from, String to) throws Exception {
		int BUFF_SIZE = 100000;
		byte[] buffer = new byte[BUFF_SIZE];
		InputStream in = null;
		OutputStream out = null;
		try {
			in = new FileInputStream(from);
			out = new FileOutputStream(to);
			while (true) {
				synchronized (buffer) {
					int amountRead = in.read(buffer);
					if (amountRead == -1) {
						break;
					}
					out.write(buffer, 0, amountRead);
				}
			}
		} finally {
			if (in != null) {
				in.close();
			}
			if (out != null) {
				out.close();
			}
		}
	}

	/**
	 * 把文件移动到to路径下
	 * 
	 * @param file
	 * @param toPath
	 * @throws IOException
	 */
	public static void moveFile(File file, String toPath, String newName)
			throws IOException {
		/*
		 * file.renameTo(new File((new StringBuilder(String.valueOf(s))).append(
		 * File.separator).append(file.getName()).toString()));
		 */
		FileUtils.copyFile(
				file,
				new File((new StringBuilder(String.valueOf(toPath)))
						.append(File.separator).append(newName).toString()));
	}

	/**
	 * 按照图片命名规则生成一个不带后缀的图片名
	 * 
	 * @param originalFullName
	 * @return
	 * @throws Exception
	 */
	public static String getNewImageName(String originalFullName)
			throws Exception {
		/*
		 * int dotIndex = originalFullName.lastIndexOf('.'); if (dotIndex == -1)
		 * { dotIndex = 0; }
		 */
		String fileName = RandomCodeGenerator.generateCodeString(10);
		return (new StringBuilder(String.valueOf(fileName))).append(
				DateTimeUtil.getCurrentDateTime().replaceAll("-", "")
						.replaceAll(":", "").replaceAll(" ", "")).toString();
	}

	/**
	 * 删除path路径下的文件
	 * 
	 * @param path
	 */
	public static void deleteFile(String path) {
		File file = new File(path);
		if (file.exists())
			file.delete();
	}

	/**
	 * 得到文件的真实后缀名 （文件种类）
	 * 
	 * @param f
	 * @return
	 * @throws Exception
	 */
	public final static String getImageFileType(File f)
			throws Exception {
		if (isImage(f)) {
			try {
				if (f.length() > 5242880) {
					throw new Exception("图片过大");
				}
				ImageInputStream iis = ImageIO.createImageInputStream(f);
				Iterator<ImageReader> iter = ImageIO.getImageReaders(iis);
				if (!iter.hasNext()) {
					return null;
				}
				ImageReader reader = iter.next();
				iis.close();
				return reader.getFormatName();
			} catch (Exception e) {
				e.printStackTrace();
				throw new Exception("图片后缀名检验异常");
			}
		} else {
			throw new Exception("图片后缀名检验异常");
		}

	}

	/**
	 * Created on 2013-1-21
	 * <p>
	 * Discription:[isImage,判断文件是否为图片]
	 * </p>
	 * 
	 * @param file
	 * @return true 是 | false 否
	 * @author:shaochangfu
	 */
	public static final boolean isImage(File file) {
		boolean flag = false;
		try {
			BufferedImage bufreader = ImageIO.read(file);
			int width = bufreader.getWidth();
			int height = bufreader.getHeight();
			if (width == 0 || height == 0) {
				flag = false;
			} else {
				flag = true;
			}
		} catch (IOException e) {
			flag = false;
		} catch (Exception e) {
			flag = false;
		}
		return flag;
	}

}