图片上传工具类

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web项目中 经常 图片上传 下面是我用到的一个自己的图片上传工具类

package com.wonder.Util;
import org.apache.log4j.Logger;
import org.aspectj.util.FileUtil;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

/**
 * Created by Guozhijie on 2016/9/23.
 */
public class UploadImageUitl {
    private static Logger logger = Logger.getLogger(UploadImageUitl.class);

    public static String upload(String basePath, MultipartFile file, String dir) throws IOException {
        //dir 保存图片文件夹
        String saveFilePath = null;
        if (file != null) {
            try {
                //文件名
                String name = file.getOriginalFilename();
                //文件后缀名
                String ext = name.substring(name.lastIndexOf(".") + 1).toLowerCase();
                DateFormat df = new SimpleDateFormat("yyyyMMddHHmmssSSS");
                String format = df.format(new Date());

                Random r = new Random();

                for (int i = 0; i < 3; i++) {
                    format += r.nextInt(10);
                }
                String fileName = dir + format + "." + ext;
                int hashCode = Math.abs(fileName.hashCode());
                int dir1 = hashCode & 0xff;
                int dir2 = hashCode & 0xff >> 4;
                //存放图片路径
                String uploadFilePath = basePath + File.separator + dir + File.separator + dir1 + File.separator + dir2;
                //访问图片路径
                saveFilePath = basePath + File.separator + dir + File.separator + dir1 + File.separator + dir2 + fileName;
                File filePath = new File(uploadFilePath);
                if (!filePath.exists() && !filePath.isDirectory()) {
                    filePath.mkdir();
                }
                file.transferTo(new File(saveFilePath));
            } catch (Exception e) {
                e.printStackTrace();
                ;
            }

        }
        return saveFilePath;
    }
}