练习：IO图片

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public class ImageInfo {

    private String name;

    private String creatTime;

    private String modifiedTime;

    private String length;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCreatTime() {
        return creatTime;
    }

    public void setCreatTime(String creatTime) {
        this.creatTime = creatTime;
    }

    public String getModifiedTime() {
        return modifiedTime;
    }

    public void setModifiedTime(String modifiedTime) {
        this.modifiedTime = modifiedTime;
    }

    public String getLength() {
        return length;
    }

    public void setLength(String length) {
        this.length = length;
    }
}

import java.io.*;
import java.math.BigDecimal;
import java.math.MathContext;
import java.text.SimpleDateFormat;
import java.util.*;


public class Test {

   private static File outFile = new File("D:/test.txt");


    public static ArrayList<ImageInfo> readfile(String filepath, ArrayList<ImageInfo> list) throws Exception {
        if (list == null) {
            list = new ArrayList();
        }

        ImageInfo info = new ImageInfo();
        File file = new File(filepath);
        // 文件
        if (!file.isDirectory()) {
            info.setName(file.getPath());
            list.add(info);

        } else if (file.isDirectory()) {
            // 如果是目录， 遍历所有子目录取出所有文件名
            String[] filelist = file.list();
            for (int i = 0; i < filelist.length; i++) {
                File readfile = new File(filepath + "/" + filelist[i]);
                if (!readfile.isDirectory()) {
                    String[] aa=readfile.getPath().split("\\\\");
                    String name=aa[aa.length-1];
                    String jpg = getCreateTime(readfile.getPath());
                    info.setName(name);
                    info.setCreatTime(jpg);
                    info.setLength(getSize(readfile));
                    info.setModifiedTime(getModifiedTime_2(readfile.getPath()));
                    list.add(info);
                } else if (readfile.isDirectory()) { // 子目录的目录
                    readfile(filepath + "/" + filelist[i], list);
                }
            }
        }
        return list;
    }

    public static String  getSize(File file)
    {
        double result=0;
        String unit="字节";
        long length = file.length();
         if(length<1024*1024*1024)
        {
            result=length/1024.0/1024;
            unit="MB";
        }

        BigDecimal bigDecimal=new BigDecimal(result+"",new MathContext(3));
        return bigDecimal.doubleValue()+unit;

    }

    public static String getCreateTime(String filePath){
        String strTime = null;
        try {
            Process p = Runtime.getRuntime().exec("cmd /C dir "
                    + filePath
                    + "/tc" );
            InputStream is = p.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String result;
            while((result = br.readLine()) != null){
                if(result.endsWith(".JPG")){
                    strTime = result.substring(0,17);
                    break;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        //System.out.println("创建时间 " + strTime);
        //输出：创建时间 2009-08-17 10:21
        return strTime;
    }

    /**
     * 读取修改时间的方法2
     */
    public static String getModifiedTime_2(String path){
        File f = new File(path);
        Calendar cal = Calendar.getInstance();
        long time = f.lastModified();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        cal.setTimeInMillis(time);
//        System.out.println("修改时间[2] " + formatter.format(cal.getTime()));
        //输出：修改时间[2]    2009-08-17 10:32:38


        return formatter.format(cal.getTime());
    }

    public static void main(String[] args) throws IOException {

        Writer out;

        try {
            ArrayList<ImageInfo> readfile = readfile("C:/Users/wth/Desktop/学习计划-第8次课-无人机影像", null);
            out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(outFile,true), "utf-8"), 10240);
            for (int i = 0; i < readfile.size(); i++) {
                out.write(
                        "#name"+readfile.get(i).getName()+
                                "create_time"+readfile.get(i).getCreatTime()
                                + "modified_time"+readfile.get(i).getModifiedTime()
                                + "length(MB)"+readfile.get(i).getLength());

                out.write("\r\n");
            }
            out.flush();
            out.close();



            for(int i=0 ; i < readfile.size(); i++) {
                System.out.println();
            }
        }
        catch (Exception ex) {
        }
    }

}