java copy all the files in a folder to another folder

Scene: Copy all files in a folder to another folder

Code:

package cn.lj.java;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;

public class FlowLogUpLoad {

    //文件夹的拷贝
    public static void copyDir(String sourcePathDir, String newPathDir) {
        File start = new File(sourcePathDir);
        File end = newFile (newPathDir); 
        String [] filePath = start.list (); // get the names of all files and directories under the folder of 
        IF (! End.exists ()) { 
            end.mkdir (); 
        } 
        boolean Flag = false ;
         for (the TEMP String: filePath) {
             // condition added to meet the circumstances of the 
            IF ( new new file (sourcePathDir + + File.separator the TEMP) .isFile () && temp.endsWith (. "DAT" )) {
                 // file the copy 
                In Flag = copyFile (sourcePathDir the File.separator + + TEMP, the File.separator newPathDir + + TEMP); 
            } 
            IF (In Flag) {
                System.out.println ( "file:" + temp + "!, Copy success" ); 
            } the else { 
                System.out.println ( "file:" + temp + ", Copy failed!" ); 
            } 
        } 
    } 

    // copy of the document 
    public  static  Boolean copyFile (the sourcePath String, String newPath) {
         Boolean in Flag = to false ; 
        file ReadFile = new new file (the sourcePath); 
        file newFile = new new file (newPath); 
        BufferedWriter, BufferedWriter = null ;
        Writer writer = null;
        FileOutputStream fileOutputStream = null;
        BufferedReader bufferedReader = null;
        try{
            fileOutputStream = new FileOutputStream(newFile, true);
            writer = new OutputStreamWriter(fileOutputStream,"UTF-8");
            bufferedWriter = new BufferedWriter(writer);
            
            bufferedReader = new BufferedReader(new FileReader(readfile));
            
            String line = null;
            while((line = bufferedReader.readLine()) != null){
                bufferedWriter.write(line);
                bufferedWriter.newLine();
                bufferedWriter.flush();
            }
            flag = true;    
        } catch(IOException e) {
            flag = false;
            e.printStackTrace();
        } finally {
            try {
                if(bufferedWriter != null){
                    bufferedWriter.close();
                }
                if(bufferedReader != null){
                    bufferedReader.close();
                }
                if(writer != null){
                    writer.close();
                }
                if(fileOutputStream != null){
                    fileOutputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return flag;
    }
    
    public static void main(String[] args) {
        
        String sourcePath = "D:\\home\\before\\20200120";
        String newPath = "E:\\home\\after\\20200120";
        System.out.print("From：" + sourcePath);
        System.out.print("To：" + newPath);
        copyDir(sourcePath, newPath);
    }

}