SpringBoot实现本地文件上传与下载

 

import cn.hutool.core.io.FileUtil;
import com.jcraft.jsch.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.SocketException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Vector;

 

// -------------------------------本地 文件上传 --------------------------


@RequestMapping(value = "/uploads")
public String uploads(@RequestParam("file") MultipartFile file) {
    try {
        if (file.isEmpty()) {
            return "文件为空";
        }
        // 获取文件名
        String fileName = file.getOriginalFilename();
        log.info("上传的文件名为：" + fileName);
        // 获取文件的后缀名
        String suffixName = fileName.substring(fileName.lastIndexOf("."));
        log.info("文件的后缀名为：" + suffixName);
        // 设置文件存储路径
        String filePath = "F:/Downloads/";
        String path = filePath + fileName;
        File dest = new File(path);
        // 检测是否存在目录
        if (!dest.getParentFile().exists()) {
            // 新建文件夹
            dest.getParentFile().mkdirs();
        }
        // 文件写入
        file.transferTo(dest);
        return "上传成功";
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return "上传失败";
}

@PostMapping("/batch")
public String handleFileUpload(HttpServletRequest request) {
    List files = ((MultipartHttpServletRequest) request).getFiles("file");
    MultipartFile file = null;
    BufferedOutputStream stream = null;
    for (int i = 0; i < files.size(); ++i) {
        file = files.get(i);
        String filePath = "F:/";
        if (!file.isEmpty()) {
            try {
                byte[] bytes = file.getBytes();
                stream = new BufferedOutputStream(new FileOutputStream(
                        new File(filePath + file.getOriginalFilename())));//设置文件路径及名字
                stream.write(bytes);// 写入
                stream.close();
            } catch (Exception e) {
                stream = null;
                return "第 " + i + " 个文件上传失败 ==> "
                        + e.getMessage();
            }
        } else {
            return "第 " + i
                    + " 个文件上传失败因为文件为空";
        }
    }
    return "上传成功";
}



@GetMapping("/downloads")
public String downloadFile(HttpServletRequest request, HttpServletResponse response) {
    String fileName = "abc.docx";// 文件名
    if (fileName != null) {
        //设置文件路径
        File file = new File("F://abc.docx");
        //File file = new File(realPath , fileName);
        if (file.exists()) {
            // 设置强制下载不打开
            response.setContentType("application/force-download");
            // 6.添加http头信息
            // 因为fileName的编码格式是UTF-8 但是http头信息只识别 ISO8859-1 的编码格式
            // 因此要对fileName重新编码
            try {
                response.addHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes("UTF-8"), "ISO8859-1"));
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }

            byte[] buffer = new byte[1024];
            FileInputStream fis = null;
            BufferedInputStream bis = null;
            try {
                fis = new FileInputStream(file);
                bis = new BufferedInputStream(fis);
                OutputStream os = response.getOutputStream();
                int i = bis.read(buffer);
                while (i != -1) {
                    os.write(buffer, 0, i);
                    i = bis.read(buffer);
                }
                return "下载成功";
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (bis != null) {
                    try {
                        bis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (fis != null) {
                    try {
                        fis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
    return "下载失败";
}



@PostMapping("/multifileUploads")
public String upload(@RequestParam("multifile") MultipartFile[] multifile) throws IOException {
    if (multifile.length > 0) {
        for (MultipartFile file : multifile) {
            // 获取文件原名
            String originalFilename = file.getOriginalFilename();
            // 创建一个新的File对象用于存放上传的文件
            File fileNew = new File("F:\" + originalFilename);
            file.transferTo(fileNew);
        }
        return "上传完成";
    }
    return "上传失败！";
}