All Downloads are FREE. Search and download functionalities are using the official Maven repository.

io.github.wj0410.cloudbox.tools.util.file.FileUtils Maven / Gradle / Ivy

The newest version!
package io.github.wj0410.cloudbox.tools.util.file;

import io.github.wj0410.cloudbox.tools.util.StringUtils;
import org.apache.commons.lang3.ArrayUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;

/**
 * 文件处理工具类
 *
 * @author wangjie
 */
public class FileUtils {
    /**
     * 字符常量:斜杠 {@code '/'}
     */
    public static final char SLASH = '/';

    /**
     * 字符常量:反斜杠 {@code '\\'}
     */
    public static final char BACKSLASH = '\\';

    public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+";

    /**
     * 输出指定文件的byte数组
     * @param filePath filePath
     * @param os os
     * @throws IOException IOException
     */
    public static void writeBytes(String filePath, OutputStream os) throws IOException {
        FileInputStream fis = null;
        try {
            File file = new File(filePath);
            if (!file.exists()) {
                throw new FileNotFoundException(filePath);
            }
            fis = new FileInputStream(file);
            byte[] b = new byte[1024];
            int length;
            while ((length = fis.read(b)) > 0) {
                os.write(b, 0, length);
            }
        } catch (IOException e) {
            throw e;
        } finally {
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
    }

    /**
     * 删除文件
     *
     * @param filePath 文件
     * @return boolean
     */
    public static boolean deleteFile(String filePath) {
        boolean flag = false;
        File file = new File(filePath);
        // 路径为文件且不为空则进行删除
        if (file.isFile() && file.exists()) {
            flag = file.delete();
        }
        return flag;
    }

    /**
     * 文件名称验证
     *
     * @param filename 文件名称
     * @return true 正常 false 非法
     */
    public static boolean isValidFilename(String filename) {
        return filename.matches(FILENAME_PATTERN);
    }

    /**
     * 检查文件是否可下载
     *
     * @param resource 需要下载的文件
     * @return true 正常 false 非法
     */
    public static boolean checkAllowDownload(String resource) {
        // 禁止目录上跳级别
        if (StringUtils.contains(resource, "..")) {
            return false;
        }
        // 判断是否在允许下载的文件规则内
        return ArrayUtils.contains(MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION, FileTypeUtils.getFileType(resource));
    }

    /**
     * 下载文件名重新编码
     * @param request 请求对象
     * @param fileName 文件名
     * @return 编码后的文件名
     * @throws UnsupportedEncodingException UnsupportedEncodingException
     */
    public static String setFileDownloadHeader(HttpServletRequest request, String fileName) throws UnsupportedEncodingException {
        final String agent = request.getHeader("USER-AGENT");
        String filename = fileName;
        if (agent.contains("MSIE")) {
            // IE浏览器
            filename = URLEncoder.encode(filename, "utf-8");
            filename = filename.replace("+", " ");
        } else if (agent.contains("Firefox")) {
            // 火狐浏览器
            filename = new String(fileName.getBytes(), "ISO8859-1");
        } else if (agent.contains("Chrome")) {
            // google浏览器
            filename = URLEncoder.encode(filename, "utf-8");
        } else {
            // 其它浏览器
            filename = URLEncoder.encode(filename, "utf-8");
        }
        return filename;
    }

    /**
     * 返回文件名
     *
     * @param filePath 文件
     * @return 文件名
     */
    public static String getName(String filePath) {
        if (null == filePath) {
            return null;
        }
        int len = filePath.length();
        if (0 == len) {
            return filePath;
        }
        if (isFileSeparator(filePath.charAt(len - 1))) {
            // 以分隔符结尾的去掉结尾分隔符
            len--;
        }

        int begin = 0;
        char c;
        for (int i = len - 1; i > -1; i--) {
            c = filePath.charAt(i);
            if (isFileSeparator(c)) {
                // 查找最后一个路径分隔符(/或者\)
                begin = i + 1;
                break;
            }
        }

        return filePath.substring(begin, len);
    }

    /**
     * 是否为Windows或者Linux(Unix)文件分隔符
* Windows平台下分隔符为\,Linux(Unix)为/ * * @param c 字符 * @return 是否为Windows或者Linux(Unix)文件分隔符 */ public static boolean isFileSeparator(char c) { return SLASH == c || BACKSLASH == c; } /** * 下载文件名重新编码 * @param response 响应对象 * @param realFileName 真实文件名 * @throws UnsupportedEncodingException UnsupportedEncodingException */ public static void setAttachmentResponseHeader(HttpServletResponse response, String realFileName) throws UnsupportedEncodingException { String percentEncodedFileName = percentEncode(realFileName); StringBuilder contentDispositionValue = new StringBuilder(); contentDispositionValue.append("attachment; filename=") .append(percentEncodedFileName) .append(";") .append("filename*=") .append("utf-8''") .append(percentEncodedFileName); response.setHeader("Content-disposition", contentDispositionValue.toString()); response.setHeader("download-filename", percentEncodedFileName); } /** * 百分号编码工具方法 * @param s 需要百分号编码的字符串 * @return 百分号编码后的字符串 * @throws UnsupportedEncodingException UnsupportedEncodingException */ public static String percentEncode(String s) throws UnsupportedEncodingException { String encode = URLEncoder.encode(s, StandardCharsets.UTF_8.toString()); return encode.replaceAll("\\+", "%20"); } }




© 2015 - 2024 Weber Informatics LLC | Privacy Policy