文件上传工具--FileUtil

package com.youmejava.chun.util;

import lombok.Data;
import org.apache.tomcat.util.http.fileupload.FileUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

/**
 * 文件工具
 */

@Data
public class FileUtil {
    private List<File> filelist;//文件列表
    private String strPath;//路径

    public FileUtil() {
    }

    public FileUtil(List<File> filelist, String strPath) {
        this.filelist = filelist;
        this.strPath = strPath;
        getFileList(this.strPath);
    }

    /**
     * 获取文件列表
     * @param strPath
     * @return
     */
    public List<File> getFileList(String strPath) {
        File dir = new File(strPath);
        File[] files = dir.listFiles(); // 该文件目录下文件全部放入数组
        if (files != null) {
            for (int i = 0; i < files.length; i++) {
                String fileName = files[i].getName();
                if (files[i].isDirectory()) { // 判断是文件还是文件夹
                    getFileList(files[i].getAbsolutePath()); // 获取文件绝对路径
                } else  { // 判断文件名
                    String strFileName = files[i].getAbsolutePath();
                    //                    System.out.println("---" + strFileName);
                    filelist.add(files[i]);
                }
            }

        }
        return filelist;
    }

    /**
     * 合并文件
     * @param from
     * @param to
     * @throws IOException
     */
    public static void mergeFile(String from, String to) throws IOException {
        File t = new File(to);
        FileInputStream in = null;
        FileChannel inChannel = null;
        System.out.println("t "+t);

        FileOutputStream out = new FileOutputStream(t,true);
        FileChannel outChannel = out.getChannel();

        File f = new File(from);
        System.out.println("f "+f.isDirectory());
        // 获取目录下的每一个文件名，再将每个文件一次写入目标文件
        if (f.isDirectory()) {
            List<File> list = getAllFileAndSort(from);
            System.out.println("sortlist  "+list);
            // 记录新文件最后一个数据的位置
            long start = 0;
            for (File file : list) {

                in = new FileInputStream(file);
                inChannel = in.getChannel();

                // 从inChannel中读取file.length()长度的数据，写入outChannel的start处
                outChannel.transferFrom(inChannel, start, file.length());
                start += file.length();
                in.close();
                inChannel.close();
            }
        }
        out.close();
        outChannel.close();
    }

    /**
     * 所有文件排序
     * @param dirPath 文件根目录路径
     * @return
     */
    public static List<File> getAllFileAndSort(String dirPath) {
        File dirFile = new File(dirPath);
        File[] listFiles = dirFile.listFiles();
        List<File> list = Arrays.asList(listFiles);
        Collections.sort(list, (o1, o2) -> {
            String _str=o1.getName().split("\\.")[0];
            String _num=_str.split("_")[1];
            String _str2=o2.getName().split("\\.")[0];
            String _num2=_str2.split("_")[1];
            return Integer.parseInt(_num) - Integer.parseInt(_num2);
        });
        return list;
    }

    /**
     * 删除文件夹
     * 删除文件夹需要把包含的文件及文件夹先删除，才能成功
     * https://blog.csdn.net/m0_57640408/article/details/120774050
     * @param directory 文件夹名
     * @return 删除成功返回true,失败返回false
     */
    public static boolean deleteDirectory(String directory) {
        // directory不以文件分隔符（/或\）结尾时，自动添加文件分隔符，不同系统下File.separator方法会自动添加相应的分隔符
        if (!directory.endsWith(File.separator)) {
            directory = directory + File.separator;
        }
        File directoryFile = new File(directory);
        // 判断directory对应的文件是否存在，或者是否是一个文件夹
        if (!directoryFile.exists() || !directoryFile.isDirectory()) {
            System.out.println("文件夹删除失败，文件夹不存在" + directory);
            return false;
        }
        boolean flag = true;
        // 删除文件夹下的所有文件和文件夹
        File[] files = directoryFile.listFiles();
        for (int i = 0; i < files.length; i++) {  // 循环删除所有的子文件及子文件夹
            // 删除子文件
            if (files[i].isFile()) {
                flag = deleteFile(files[i].getAbsolutePath());
                if (!flag) {
                    break;
                }
            } else {  // 删除子文件夹
                flag = deleteDirectory(files[i].getAbsolutePath());
                if (!flag) {
                    break;
                }
            }
        }

        if (!flag) {
            System.out.println("删除失败");
            return false;
        }
        // 最后删除当前文件夹
        if (directoryFile.delete()) {
            System.out.println("删除成功：" + directory);
            return true;
        } else {
            System.out.println("删除失败：" + directory);
            return false;
        }
    }

    /**
     * 删除文件
     *
     * @param fileName 文件名
     * @return 删除成功返回true,失败返回false
     */
    public static boolean deleteFile(String fileName) {
        File file = new File(fileName);
        if (file.isFile() && file.exists()) {
            file.delete();
            System.out.println("删除文件成功：" + fileName);
            return true;
        } else {
            System.out.println("删除文件失败：" + fileName);
            return false;
        }
    }

}

分片上传文件接口

 package com.youmejava.chun.commoninterface;

import com.youmejava.chun.util.FileUtil;
import com.youmejava.chun.util.ResultVo;
import com.youmejava.chun.util.StringUtil;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
import org.apache.shiro.authc.ExpiredCredentialsException;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@RestController
@RequestMapping("/api/apiSystem/upload")
@Api(value = "文件上传", tags = "文件上传")
public class UploadController {

    @Value("${filePath1}")
    private String filePath;

    @PostMapping("/register")
    @ApiOperation(value = "文件注册", notes = "文件注册")
    @ApiImplicitParams({@ApiImplicitParam(value = "哈希值", name = "hash", required = true, paramType = "body")})
    public ResultVo register(@RequestBody Map<String, Object> map) {
        System.out.println("hash: " + map.get("hash"));
        if (!StringUtil.isNotBlankAndNull(map.get("hash").toString())) {
            //            return ResultVo.failure("哈希值不可为空");
            throw new ExpiredCredentialsException("哈希值不可为空！");
        }
        String _filePath=filePath;
        if (!_filePath.endsWith("/")) {
            _filePath+="/";
        }
//        String _pathStr = "C:\\Users\\JH-rent\\Desktop\\java启动文件\\test" + "\\" + map.get("hash");
        String _pathStr=_filePath+map.get("hash");
        //创建不同的文件夹目录
        File file = new File(_pathStr);
        //判断文件夹是否存在
        if (!file.exists()) {
            //如果文件夹不存在，则创建新的的文件夹
            file.mkdirs();
        }
        File f = new File(_pathStr);

        // 检查目录是否已上传过文件，如果上传过，返回上传个数
        if (f.isDirectory()) {
            File dirFile = new File(_pathStr);
            File[] listFiles = dirFile.listFiles();
            List<File> list = Arrays.asList(listFiles);
            if (list == null&&list.size()>0) {
                Map<String, Object>map1=new HashMap<>();
                map1.put("number",list.size());
                return ResultVo.success(map1);
            }
        }

        return ResultVo.success();
    }

    @PostMapping("/uploadFile")
    @ResponseBody
    @ApiOperation(value = "上传文件", notes = "上传文件")
    @ApiImplicitParams({@ApiImplicitParam(value = "哈希值", name = "hash", required = true, paramType = "body"), @ApiImplicitParam(value = "文件流", name = "file", required = true, paramType = "body"), @ApiImplicitParam(value = "文件名称", name = "fileName", required = true, paramType = "body"),})
    public ResultVo uploadFile(HttpServletRequest request) {
        MultipartHttpServletRequest params = ((MultipartHttpServletRequest) request);
        List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");
        String _fileName = params.getParameter("fileName");
        String _hash = params.getParameter("hash");
        if (!StringUtil.isNotBlankAndNull(_hash)) {
            throw new ExpiredCredentialsException("哈希值不可为空！");
        }
        if (!StringUtil.isNotBlankAndNull(_fileName)) {
            throw new ExpiredCredentialsException("文件名称不可为空！");
        }
//        System.out.println("_fileName: " + _fileName);
//        System.out.println("_hash: " + _hash);
//        System.out.println("files: " + files);
//        System.out.println(params.getParameter("file"));
//        String _pathStr = "C:\\Users\\JH-rent\\Desktop\\java启动文件\\test" + "\\" + _hash + "\\";

        String _filePath=filePath;
        if (!_filePath.endsWith("/")) {
            _filePath+="/";
        }
        String _pathStr =_filePath+_hash+"/";

        FileOutputStream fileOut = null;
        //写入到文件（注意文件保存路径的后面一定要加上文件的名称）

        try {
            fileOut = new FileOutputStream(_pathStr + _fileName);
            BufferedOutputStream bos = new BufferedOutputStream(fileOut);
            BufferedInputStream bis = null;
            for (MultipartFile file : files) {
                //                file.transferTo(new File(_pathStr + file.getOriginalFilename()));
                //                System.out.println(file.getInputStream());
                bis = new BufferedInputStream(file.getInputStream());
            }

            byte[] buf = new byte[4096];
            int length = bis.read(buf);
            //保存文件
            while (length != -1) {
                bos.write(buf, 0, length);
                length = bis.read(buf);
            }
            bos.close();
            bis.close();
            return ResultVo.success();
        } catch (Exception e) {
            e.printStackTrace();
            return ResultVo.failure(e.getMessage());
        }

    }

    @GetMapping("/getMergeFile")
    @ApiOperation(value = "获取合并文件", notes = "获取合并文件")
    @ApiImplicitParams({@ApiImplicitParam(value = "哈希值", name = "hash", required = true, dataType = "String"), @ApiImplicitParam(value = "文件名称", name = "fileName", required = true, dataType = "String")})
    public ResultVo getMergeFile(@RequestParam(value = "hash") String hash, @RequestParam(value = "fileName") String fileName) {
//        String _pathStr = "C:\\Users\\JH-rent\\Desktop\\java启动文件\\test" + "\\" + hash + "\\";
//        String _pathStr1 = "C:\\Users\\JH-rent\\Desktop\\java启动文件\\test";

        String _filePath=filePath;
        if (!_filePath.endsWith("/")) {
            _filePath+="/";
        }
        String _pathStr = _filePath + hash + "/";
        String _pathStr1 = _filePath;
        try {
//            if (!_pathStr1.endsWith("\\")) {
//                _pathStr1 += "\\";
//            }
            _pathStr1 += fileName;
            FileUtil.mergeFile(_pathStr, _pathStr1);
            //合并成功删除加密文件
            FileUtil.deleteDirectory(_pathStr);
        } catch (IOException e) {
            e.printStackTrace();
        }
        Map<String, Object>map=new HashMap<>();
        map.put("fileUrl",_pathStr1);
        return ResultVo.success(map);
    }

}

前端分片链接：https://www.cnblogs.com/wxchun/p/15892243.html