文件上传工具类 UploadUtil.java

package com.util;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Calendar;

/**
 * 文件上传工具类
 *
 */
public class UploadUtil {
    private static final int BUFFER_SIZE = 16 * 1024;
    //保存图片
    public static synchronized void copy(File src, File newFile) {

        try {
            InputStream is = null;
            OutputStream os = null;
            try {
                is = new BufferedInputStream(new FileInputStream(src),
                        BUFFER_SIZE);
                os = new BufferedOutputStream(new FileOutputStream(newFile),
                        BUFFER_SIZE);
                byte[] buffer = new byte[BUFFER_SIZE];
                while (is.read(buffer) > 0) {
                    os.write(buffer);
                }
            } finally {
                if (null != is) {
                    is.close();
                }
                if (null != os) {
                    os.close();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 返回 年号+月号+天+时+分+秒+随机码
     * @return
     */
    @SuppressWarnings("static-access")
    public static synchronized String getTime() {
        Calendar calendar = Calendar.getInstance();
        String year = calendar.get(calendar.YEAR) + "";
        String month = (calendar.get(calendar.MONTH) + 1) + "";
        String day = calendar.get(calendar.DAY_OF_MONTH) + "";
        String hour = calendar.get(calendar.HOUR_OF_DAY) + "";
        String minute = calendar.get(calendar.MINUTE) + "";
        String second = calendar.get(calendar.SECOND) + "";
        String milliSecond = calendar.get(calendar.MILLISECOND) + "";
        int r = (int)(Math.random()*100000);
        String random = String.valueOf(r);
        return year + month + day + hour + minute + second + milliSecond + random+"a";
    }

}