求各位boss解答简单Java问题

1、编程实现一个时间服务器， 客户端请求服务端， 服务端返回当前时间给客户端。
2、编程实现将E:\Downloads\test.txt拷贝了D:\Downloads\下面， 目前Downloads文件夹不存在。

package com.test.xsj.controller;

import com.alibaba.fastjson.JSONObject;
import lombok.extern.log4j.Log4j2;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;

/**

• @author xsj

• @date 2022/6/20 15:43

• /
  @RestController
  @RequestMapping("/api/time")
  @Log4j2
  public class TimeController {

  /**

  • @return 返回当前服务器时间
  • /
    @PostMapping("/getTime")
    public JSONObject getDateTime() {
    JSONObject result = new JSONObject();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    result.put("time", sdf.format(new Date()));
    return result;
    }

  /**

  • @return 复制xxx路径下文件到aaa路径
  • /
    @PostMapping("/cv")
    public JSONObject getCV() {
    JSONObject result = new JSONObject();
    try{

      FileInputStream in = new FileInputStream("E:/Download/test/test.txt");
      FileOutputStream out = new FileOutputStream("E:/Download/test/data/aaa.txt");
      byte[] bytearray = new byte[1024];
      do {
          in.read(bytearray, 0, 1024);
          out.write(bytearray);
      } while (in.available() > 0);
      in.close();
      out.close();
      
      result.put("result", "成功");
      return result;
    

    }catch (Exception e){

      log.error("异常：",e);//打印异常信息
      result.put("result", "失败");
      return result;
    

    }
    }

}

 @RequestMapping(value = "/getTime", method = {RequestMethod.GET, RequestMethod.POST})    public Date getTime() {        return new Date();    }    public void fileCopy() throws Exception{        String oldPath="E:\\Downloads\\test.txt";        String newPath="D:\\Downloads\\test.txt";        String directory="D:\\Downloads\\";        File oldFile = new File(oldPath);        File directoryFile = new File(directory);        File newFile = new File(newPath);        directoryFile.mkdir();        try (FileInputStream fis = new FileInputStream(oldFile);             FileChannel input = fis.getChannel();             FileOutputStream fos = new FileOutputStream(newFile);             FileChannel output = fos.getChannel()) {            final long size = input.size(); // TODO See IO-386            long pos = 0;            long count = 0;            while (pos < size) {                final long remain = size - pos;                count = remain > 30*1024* 1024? 30*1024* 1024 : remain;                final long bytesCopied = output.transferFrom(input, pos, count);                if (bytesCopied == 0) { // IO-385 - can happen if file is truncated after caching the size                    break; // ensure we don't loop forever                }                pos += bytesCopied;            }        }    }

这样

本地提前新建好Downloads文件夹

下面的用到文件流的读写等

l.socket编程
2. 可以先用File抽象路径对象可以mkdir创建文件夹
然后拷贝