package com.ruoyi.common.core.utils.file;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.UnsupportedEncodingException;
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import java.net.URLEncoder;
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import java.nio.charset.StandardCharsets;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.apache.commons.lang3.ArrayUtils;
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import com.ruoyi.common.core.utils.StringUtils;
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/**
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* 文件处理工具类
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*
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* @author ruoyi
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*/
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public class FileUtils
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{
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/** 字符常量：斜杠 {@code '/'} */
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public static final char SLASH = '/';
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/** 字符常量：反斜杠 {@code '\\'} */
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public static final char BACKSLASH = '\\';
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public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+";
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/**
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* 输出指定文件的byte数组
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*
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* @param filePath 文件路径
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* @param os 输出流
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* @return
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*/
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public static void writeBytes(String filePath, OutputStream os) throws IOException
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{
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FileInputStream fis = null;
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try
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{
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File file = new File(filePath);
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if (!file.exists())
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{
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throw new FileNotFoundException(filePath);
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}
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fis = new FileInputStream(file);
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byte[] b = new byte[1024];
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int length;
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while ((length = fis.read(b)) > 0)
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{
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os.write(b, 0, length);
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}
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}
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catch (IOException e)
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{
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throw e;
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}
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finally
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{
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if (os != null)
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{
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try
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{
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os.close();
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}
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catch (IOException e1)
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{
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e1.printStackTrace();
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}
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}
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if (fis != null)
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{
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try
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{
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fis.close();
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}
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catch (IOException e1)
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{
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e1.printStackTrace();
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}
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}
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}
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}
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/**
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* 删除文件
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*
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* @param filePath 文件
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* @return
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*/
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public static boolean deleteFile(String filePath)
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{
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boolean flag = false;
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File file = new File(filePath);
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// 路径为文件且不为空则进行删除
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if (file.isFile() && file.exists())
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{
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flag = file.delete();
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}
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return flag;
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}
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/**
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* 文件名称验证
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*
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* @param filename 文件名称
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* @return true 正常 false 非法
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*/
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public static boolean isValidFilename(String filename)
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{
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return filename.matches(FILENAME_PATTERN);
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}
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/**
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* 检查文件是否可下载
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*
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* @param resource 需要下载的文件
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* @return true 正常 false 非法
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*/
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public static boolean checkAllowDownload(String resource)
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{
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// 禁止目录上跳级别
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if (StringUtils.contains(resource, ".."))
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{
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return false;
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}
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// 判断是否在允许下载的文件规则内
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return ArrayUtils.contains(MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION, FileTypeUtils.getFileType(resource));
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}
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/**
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* 下载文件名重新编码
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*
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* @param request 请求对象
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* @param fileName 文件名
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* @return 编码后的文件名
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*/
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public static String setFileDownloadHeader(HttpServletRequest request, String fileName) throws UnsupportedEncodingException
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{
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final String agent = request.getHeader("USER-AGENT");
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String filename = fileName;
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if (agent.contains("MSIE"))
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{
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// IE浏览器
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filename = URLEncoder.encode(filename, "utf-8");
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filename = filename.replace("+", " ");
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}
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else if (agent.contains("Firefox"))
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{
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// 火狐浏览器
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filename = new String(fileName.getBytes(), "ISO8859-1");
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}
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else if (agent.contains("Chrome"))
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{
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// google浏览器
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filename = URLEncoder.encode(filename, "utf-8");
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}
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else
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{
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// 其它浏览器
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filename = URLEncoder.encode(filename, "utf-8");
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}
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return filename;
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}
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/**
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* 返回文件名
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*
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* @param filePath 文件
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* @return 文件名
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*/
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public static String getName(String filePath)
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{
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if (null == filePath)
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{
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return null;
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}
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int len = filePath.length();
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if (0 == len)
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{
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return filePath;
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}
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if (isFileSeparator(filePath.charAt(len - 1)))
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{
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// 以分隔符结尾的去掉结尾分隔符
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len--;
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}
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int begin = 0;
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char c;
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for (int i = len - 1; i > -1; i--)
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{
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c = filePath.charAt(i);
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if (isFileSeparator(c))
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{
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// 查找最后一个路径分隔符（/或者\）
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begin = i + 1;
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break;
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}
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}
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return filePath.substring(begin, len);
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}
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/**
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* 是否为Windows或者Linux（Unix）文件分隔符<br>
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* Windows平台下分隔符为\，Linux（Unix）为/
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*
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* @param c 字符
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* @return 是否为Windows或者Linux（Unix）文件分隔符
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*/
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public static boolean isFileSeparator(char c)
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{
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return SLASH == c || BACKSLASH == c;
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}
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/**
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* 下载文件名重新编码
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*
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* @param response 响应对象
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* @param realFileName 真实文件名
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* @return
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*/
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public static void setAttachmentResponseHeader(HttpServletResponse response, String realFileName) throws UnsupportedEncodingException
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{
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String percentEncodedFileName = percentEncode(realFileName);
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StringBuilder contentDispositionValue = new StringBuilder();
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contentDispositionValue.append("attachment; filename=")
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.append(percentEncodedFileName)
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.append(";")
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.append("filename*=")
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.append("utf-8''")
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.append(percentEncodedFileName);
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response.setHeader("Content-disposition", contentDispositionValue.toString());
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response.setHeader("download-filename", percentEncodedFileName);
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}
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/**
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* 百分号编码工具方法
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*
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* @param s 需要百分号编码的字符串
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* @return 百分号编码后的字符串
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*/
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public static String percentEncode(String s) throws UnsupportedEncodingException
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{
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String encode = URLEncoder.encode(s, StandardCharsets.UTF_8.toString());
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return encode.replaceAll("\\+", "%20");
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}
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}
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