从网络上下载文件到本地

package com.example.demo.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;

@Controller
@Slf4j
@RequestMapping("/test15")
public class Test15Controller {

    @Resource
    private HttpServletResponse response;

    @GetMapping("/fileDownLoad")
    @ResponseBody
    public void fileDownload() {
        InputStream inputStream = null;
        URL url = null;
        try {
            url = new URL("https://n.sinaimg.cn/ent/4_img/upload/1f0ce517/160/w1024h1536/20210413/0dad-knqqqmv1022299.jpg");
            inputStream = url.openStream();
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode("李勇亮.jpg", "UTF-8"));
            // 使用工具类直接将文件的字节复制到响应输出流中
            FileCopyUtils.copy(inputStream, response.getOutputStream());
        } catch (MalformedURLException e) {
            log.error("获取远程数据失败：", e);
            e.printStackTrace();
        } catch (IOException e) {
            log.error("读取远程数据失败：", e);
            e.printStackTrace();
        }finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    log.error("关闭流失败：", e);
                    e.printStackTrace();
                }
            }
        }
    }
}