springmvc文件上传

package org.llf.controller;

import org.apache.poi.util.IOUtils;
import org.llf.util.FileTools;
import org.llf.util.FileTypeUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;


@RestController
public class UploadFileController {
    private static final Logger logger = LoggerFactory.getLogger(UploadFileController.class);

    
    @RequestMapping("/upload")
    public String uploadFile(@RequestParam("uploadFile") MultipartFile file) {
        // 根据路径地址创建File对象
        String targetFilePath = "E:\test\uploadTest";
        File targetFile = new File(targetFilePath + File.separator + file.getOriginalFilename());
        FileOutputStream fileOutputStream = null;
        try {
            // 通过文件后缀名获取文件类型,如果文件类型不在上传白名单种,提示错误
            String fileType = FileTypeUtils.getFileTypeBySuffix(file.getOriginalFilename());

            // 根据文件后缀和文件字节数组,判断是否为文件真实类型
            boolean b = FileTools.getFileType("jpg", file.getBytes());
            if (!b) {
                return "文件真实类型校验不通过";
            }

            // 限制文件上传大小不能超过3M
            if (file.getSize() > 1024 * 1024 * 3) {
                return "文件大小不能超过3M";
            }

            // 根据File对象定义文件输出流
            fileOutputStream = new FileOutputStream(targetFile);
            // 把上传得文件流复制到自定义的文件输出流,完成文件的输出
            IOUtils.copy(file.getInputStream(), fileOutputStream);
            logger.info("   >>>>>> upload file successfully <<<<<<------");
        } catch (IOException e) {
            logger.info("文件输出到指定磁盘异常" + e);
            return "system error";
        } finally {
            try {
                // 最后关闭文件流
                fileOutputStream.close();
            } catch (IOException e) {
                logger.error("", e);
            }
        }
        return "上传成功";
    }


}

package org.llf.util;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;


public class FileTypeUtils {

    // 默认判断文件头前三个字节内容
    public static int default_check_length = 3;
    final static HashMap fileTypeMap = new HashMap<>();

    // 初始化文件头类型，不够的自行补充
    static {
        fileTypeMap.put("ffd8ffe000104a464946", "jpg");
        fileTypeMap.put("89504e470d0a1a0a0000", "png");
        fileTypeMap.put("47494638396126026f01", "gif");
        fileTypeMap.put("49492a00227105008037", "tif");
        fileTypeMap.put("424d228c010000000000", "bmp");
        fileTypeMap.put("424d8240090000000000", "bmp");
        fileTypeMap.put("424d8e1b030000000000", "bmp");
        fileTypeMap.put("41433130313500000000", "dwg");
        fileTypeMap.put("3c21444f435459504520", "html");
        fileTypeMap.put("3c21646f637479706520", "htm");
        fileTypeMap.put("48544d4c207b0d0a0942", "css");
        fileTypeMap.put("696b2e71623d696b2e71", "js");
        fileTypeMap.put("7b5c727466315c616e73", "rtf");
        fileTypeMap.put("38425053000100000000", "psd");
        fileTypeMap.put("46726f6d3a203d3f6762", "eml");
        fileTypeMap.put("d0cf11e0a1b11ae10000", "doc");
        fileTypeMap.put("5374616E64617264204A", "mdb");
        fileTypeMap.put("252150532D41646F6265", "ps");
        fileTypeMap.put("255044462d312e350d0a", "pdf");
        fileTypeMap.put("2e524d46000000120001", "rmvb");
        fileTypeMap.put("464c5601050000000900", "flv");
        fileTypeMap.put("00000020667479706d70", "mp4");
        fileTypeMap.put("49443303000000002176", "mp3");
        fileTypeMap.put("000001ba210001000180", "mpg");
        fileTypeMap.put("3026b2758e66cf11a6d9", "wmv");
        fileTypeMap.put("52494646e27807005741", "wav");
        fileTypeMap.put("52494646d07d60074156", "avi");
        fileTypeMap.put("4d546864000000060001", "mid");
        fileTypeMap.put("504b0304140000000800", "zip");
        fileTypeMap.put("526172211a0700cf9073", "rar");
        fileTypeMap.put("235468697320636f6e66", "ini");
        fileTypeMap.put("504b03040a0000000000", "jar");
        fileTypeMap.put("4d5a9000030000000400", "exe");
        fileTypeMap.put("3c25402070616765206c", "jsp");
        fileTypeMap.put("4d616e69666573742d56", "mf");
        fileTypeMap.put("3c3f786d6c2076657273", "xml");
        fileTypeMap.put("494e5345525420494e54", "sql");
        fileTypeMap.put("7061636b616765207765", "java");
        fileTypeMap.put("406563686f206f66660d", "bat");
        fileTypeMap.put("1f8b0800000000000000", "gz");
        fileTypeMap.put("6c6f67346a2e726f6f74", "properties");
        fileTypeMap.put("cafebabe0000002e0041", "class");
        fileTypeMap.put("49545346030000006000", "chm");
        fileTypeMap.put("04000000010000001300", "mxp");
        fileTypeMap.put("504b0304140006000800", "docx");
        fileTypeMap.put("6431303a637265617465", "torrent");
        fileTypeMap.put("6D6F6F76", "mov");
        fileTypeMap.put("FF575043", "wpd");
        fileTypeMap.put("CFAD12FEC5FD746F", "dbx");
        fileTypeMap.put("2142444E", "pst");
        fileTypeMap.put("AC9EBD8F", "qdf");
        fileTypeMap.put("E3828596", "pwl");
        fileTypeMap.put("2E7261FD", "ram");
    }

    
    public static String getFileTypeBySuffix(String fileName) {
        return fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length());
    }


    
    public static String getFileTypeByMagicNumber(byte[] bytes) {
        try {
            // 获取文件头前三位魔数的二进制
            // 文件头前三位魔数二进制转为16进制                                                                          504b0304140000000800
            String code = bytesToHexString(bytes);
            for (Map.Entry item : fileTypeMap.entrySet()) {
                // 这里其实只要用前三位或者前
                item.getKey().substring(0, 3);
                if (code.toLowerCase(Locale.ENGLISH).startsWith(item.getKey().toLowerCase(Locale.ENGLISH)) ||
                        item.getKey().toLowerCase(Locale.ENGLISH).startsWith(code.toLowerCase(Locale.ENGLISH))) {
                    return item.getValue();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

    
    public static String bytesToHexString(byte[] bytes) {
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < bytes.length; i++) {
            int v = bytes[i] & 0xFF;
            String hv = Integer.toHexString(v);
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv);
        }
        return stringBuilder.toString();
    }
}