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

package com.ruoyi.common.utils.file;

import com.ruoyi.common.config.RuoYiConfig;
import org.springframework.web.multipart.MultipartFile;

import java.io.*;
import java.net.URL;
import java.net.URLEncoder;
import javax.net.ssl.HttpsURLConnection;
import javax.servlet.http.HttpServletRequest;

/**
 * 文件处理工具类
 *
 * @author ruoyi
 */
public class FileUtils extends org.apache.commons.io.FileUtils {
    public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+";

    /**
     * 输出指定文件的byte数组
     *
     * @param filePath 文件路径
     * @param os       输出流
     * @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();
                }
            }
        }
    }
    /**
     * MultipartFile转File
     *
     * @param param
     * @return
     */
    public static File transfer(MultipartFile param) {
        if (!param.isEmpty()) {
            File file = null;
            try {
                InputStream in = param.getInputStream();
                file = new File(param.getOriginalFilename());
                OutputStream out = new FileOutputStream(file);
                int bytesRead = 0;
                byte[] buffer = new byte[8192];
                while ((bytesRead = in.read(buffer, 0, 8192)) != -1) {
                    out.write(buffer, 0, bytesRead);
                }
                in.close();
                out.close();
                return file;
            } catch (Exception e) {
                e.printStackTrace();
                return file;
            }
        }
        return null;
    }



    /**
     * 删除文件
     *
     * @param filePath 文件
     * @return
     */
    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()) {
            file.delete();
            flag = true;
        }
        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);
    }

    /**
     * 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
     */
    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;
    }

    /**
     * 获取指定文件的输入流
     *
     * @param logoPath 文件的路径
     * @return
     */
    public static InputStream getResourceAsStream(String logoPath) {
        return FileUtils.class.getResourceAsStream(logoPath);
    }

    /**
     * 下载微信头像到本地
     *
     * @param imageUrl
     * @return
     * @throws IOException
     */
    public static String avatarUrl(String imageUrl) throws IOException {
        URL url = new URL(imageUrl);
        HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
        // 得到URL的输入流
        InputStream input = con.getInputStream();
        // 设置数据缓冲
        byte[] bs = new byte[1024 * 2];
        // 读取到的数据长度
        int len = 0;
        // 输出的文件流保存图片至本地
        String fileName = System.currentTimeMillis() + ".jpg";
        OutputStream os = new FileOutputStream(RuoYiConfig.getUploadPath() + "/" + fileName);
        while ((len = input.read(bs)) != -1) {
            os.write(bs, 0, len);
        }
        os.close();
        input.close();
        return fileName;
    }
}