io流操作文件夹及文件

/**
     * 复制文件夹到另外的文件夹
     */
    public void process() {

        Calendar calendar = Calendar.getInstance();
        String dir = calendar.get(Calendar.YEAR) + "" + getTimeString(calendar.get(Calendar.MONTH) + "");

        String oldPath = "/img2" + dir;
        String newPath = "/img5" + dir;

        try {

            while(true){
                System.out.println("复制 " + oldPath + " 目录开始");
                long t1 = System.currentTimeMillis();

                num = 0;
                copyFolder(oldPath, newPath);

                long t2 = System.currentTimeMillis();
                System.out.println("复制目录结束，用时：" + (t2-t1) + "ms,共复制：" + num + "文件");
            }

        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }


    public void copyFolder(String oldPath, String newPath) {

        try {
            File mFile = new File(newPath);
            if(!mFile .exists()){
                (new File(newPath)).mkdirs(); // 如果文件夹不存在 则建立新文件夹
            }
            File a = new File(oldPath);
            String[] file = a.list();
            File temp = null;
            for (int i = 0; i < file.length; i++) {
                if (oldPath.endsWith(File.separator)) {
                    temp = new File(oldPath + file[i]);
                } else {
                    temp = new File(oldPath + File.separator + file[i]);
                }

                if (temp.isFile()) {
                    String fileName = newPath + "/" + (temp.getName()).toString();
                    File testFile = new File(fileName);
                    if (!testFile.exists()) {
                        FileInputStream input = new FileInputStream(temp);
                        FileOutputStream output = new FileOutputStream(fileName);
                        byte[] b = new byte[1024 * 5];
                        int len;
                        while ((len = input.read(b)) != -1) {
                            output.write(b, 0, len);
                        }
                        output.flush();
                        output.close();
                        input.close();
                        num++;
                    }
                }
                if (temp.isDirectory()) {// 如果是子文件夹
                    copyFolder(oldPath + "/" + file[i], newPath + "/" + file[i]);
                }
            }
        } catch (Exception e) {
            System.out.println("复制整个文件夹内容操作出错");
            e.printStackTrace();

        }
    }

package com.fh.util;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

import org.apache.commons.io.FileUtils;
import org.springframework.web.multipart.MultipartFile;

/**
 * 说明：上传文件
 * 作者：FH Admin
 * 官网：fhadmin.cn
 */
public class FileUpload {

    /**上传文件
     * @param file             //文件对象
     * @param filePath        //上传路径
     * @param fileName        //文件名
     * @return  文件名
     */
    public static String fileUp(MultipartFile file, String filePath, String fileName){
        String extName = ""; // 扩展名格式：
        try {
            if (file.getOriginalFilename().lastIndexOf(".") >= 0){
                extName = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
            }
            copyFile(file.getInputStream(), filePath, fileName+extName).replaceAll("-", "");
        } catch (IOException e) {
            System.out.println(e);
        }
        return fileName+extName;
    }
    
    /**
     * 写文件到当前目录的upload目录中
     * @param in
     * @param fileName
     * @throws IOException
     */
    public static String copyFile(InputStream in, String dir, String realName)
            throws IOException {
        File file = mkdirsmy(dir,realName);
        FileUtils.copyInputStreamToFile(in, file);
        in.close();
        return realName;
    }
    
    
    /**判断路径是否存在，否：创建此路径
     * @param dir  文件路径
     * @param realName  文件名
     * @throws IOException 
     */
    public static File mkdirsmy(String dir, String realName) throws IOException{
        File file = new File(dir, realName);
        if (!file.exists()) {
            if (!file.getParentFile().exists()) {
                file.getParentFile().mkdirs();
            }
            file.createNewFile();
        }
        return file;
    }
    
    
    /**下载网络图片上传到服务器上
     * @param httpUrl 图片网络地址
     * @param filePath    图片保存路径
     * @param myFileName  图片文件名(null时用网络图片原名)
     * @return    返回图片名称
     */
    public static String getHtmlPicture(String httpUrl, String filePath , String myFileName) {
        
        URL url;                        //定义URL对象url
        BufferedInputStream in;            //定义输入字节缓冲流对象in
        FileOutputStream file;            //定义文件输出流对象file
        try {
            String fileName = null == myFileName?httpUrl.substring(httpUrl.lastIndexOf("/")).replace("/", ""):myFileName; //图片文件名(null时用网络图片原名)
            url = new URL(httpUrl);        //初始化url对象
            in = new BufferedInputStream(url.openStream());                                    //初始化in对象，也就是获得url字节流
            //file = new FileOutputStream(new File(filePath +"\\"+ fileName));
            file = new FileOutputStream(mkdirsmy(filePath,fileName));
            int t;
            while ((t = in.read()) != -1) {
                file.write(t);
            }
            file.close();
            in.close();
            return fileName;
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
        
    }
}



package com.fh.util;

import java.io.BufferedOutputStream;
import java.io.OutputStream;
import java.net.URLEncoder;

import javax.servlet.http.HttpServletResponse;

/**
 * 说明：下载文件
 * 作者：FH Admin
 * 官网：fhadmin.cn
 */
public class FileDownload {

    /**
     * @param response 
     * @param filePath        //文件完整路径(包括文件名和扩展名)
     * @param fileName        //下载后看到的文件名
     * @return  文件名
     */
    public static void fileDownload(final HttpServletResponse response, String filePath, String fileName) throws Exception{  
        byte[] data = FileUtil.toByteArray2(filePath);  
        fileName = URLEncoder.encode(fileName, "UTF-8");  
        response.reset();  
        response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");  
        response.addHeader("Content-Length", "" + data.length);  
        response.setContentType("application/octet-stream;charset=UTF-8");  
        OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());  
        outputStream.write(data);  
        outputStream.flush();  
        outputStream.close();
        response.flushBuffer();
    } 

}