Merge branch 'master' of https://gitee.com/y_project/RuoYi-Vue

疯狂的狮子li

2020-02-18 a1cf719d268a9d16db81ece94e75037c844f898f

 ruoyi/src/main/java/com/ruoyi/common/utils/file/FileUtils.java

¶Ô±ÈÐÂÎļþ
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package com.ruoyi.common.utils.file;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import javax.servlet.http.HttpServletRequest;

/**
 * æ–‡ä»¶å¤„理工具类
 * 
 * @author ruoyi
 */
public class FileUtils
{
    public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+";

    /**
     * è¾“出指定文件的byte数组
     * 
     * @param filePath æ–‡ä»¶è·¯å¾„
     * @param os è¾“出流
     * @return
     */
    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();
                }
            }
        }
    }

    /**
     * åˆ é™¤æ–‡ä»¶
     * 
     * @param filePath æ–‡ä»¶
     * @return
     */
    public static boolean deleteFile(String filePath)
    {
        boolean flag = false;
        File file = new File(filePath);
        // è·¯å¾„为文件且不为空则进行删除
        if (file.isFile() && file.exists())
        {
            file.delete();
            flag = true;
        }
        return flag;
    }

    /**
     * æ–‡ä»¶åç§°éªŒè¯
     * 
     * @param filename æ–‡ä»¶åç§°
     * @return true æ­£å¸¸ false éžæ³•
     */
    public static boolean isValidFilename(String filename)
    {
        return filename.matches(FILENAME_PATTERN);
    }

    /**
     * ä¸‹è½½æ–‡ä»¶åé‡æ–°ç¼–码
     * 
     * @param request è¯·æ±‚对象
     * @param fileName æ–‡ä»¶å
     * @return ç¼–码后的文件名
     */
    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"))
        {
            // ç«ç‹æµè§ˆå™¨
            filename = new String(fileName.getBytes(), "ISO8859-1");
        }
        else if (agent.contains("Chrome"))
        {
            // google浏览器
            filename = URLEncoder.encode(filename, "utf-8");
        }
        else
        {
            // å…¶å®ƒæµè§ˆå™¨
            filename = URLEncoder.encode(filename, "utf-8");
        }
        return filename;
    }
}