java 复制某一文件夹下的所有文件到另一个文件夹下

场景：复制某一文件夹下的所有文件到另一个文件夹下

代码：

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 = new File(newPathDir);
        String[] filePath = start.list();//获取该文件夹下的所有文件以及目录的名字
        if(!end.exists()) {
            end.mkdir();
        }
        boolean flag = false;
        for(String temp : filePath) {
            //添加满足情况的条件
            if(new File(sourcePathDir + File.separator + temp ).isFile() && temp.endsWith(".dat")) {
                //为文件则进行拷贝
                flag = copyFile(sourcePathDir + File.separator + temp, newPathDir + File.separator+temp );
            }
            if(flag){
                System.out.println("文件:" + temp + ",复制成功！");
            }else{
                System.out.println("文件:" + temp + ",复制失败！");
            }
        }
    }

    //文件的拷贝
    public static boolean copyFile(String sourcePath, String newPath) {
        boolean flag = false;
        File readfile = new File(sourcePath);
        File newFile = 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);
    }

}