package com.yssh.utils;
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import javax.servlet.ServletOutputStream;
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import javax.servlet.http.HttpServletResponse;
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import java.io.FileInputStream;
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import java.net.URLEncoder;
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import java.util.Date;
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/**
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* Web工具类
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* @author WWW
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* @date 2023-08-09
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*/
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public class WebUtils {
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/**
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* 字符点
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*/
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public final static String POINT = ".";
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/**
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* 下载文件
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*
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* @param file 文件
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* @param fileName 文件名
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* @param res 响应
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* @throws Exception 异常
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*/
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public static void download(String file, String fileName, boolean inline, HttpServletResponse res) throws Exception {
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if (StringUtils.isEmpty(fileName)) {
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fileName = DateUtils.parseDateToStr(DateUtils.YYYYMMDDHHMMSS, new Date());
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}
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fileName = URLEncoder.encode(fileName, "UTF-8").replace("+", "%20");
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String dispose = inline ? "inline" : "attachment";
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// 设置响应头中文件的下载方式为附件方式，以及设置文件名
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res.setHeader("Content-Disposition", dispose + "; filename*=UTF-8''" + fileName);
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// 设置响应头的编码格式为 UTF-8
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res.setCharacterEncoding("UTF-8");
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// 通过response对象设置响应数据格式(如："text/plain; charset=utf-8")
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String ext = getExtension(file);
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String mime = getMime(ext);
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res.setContentType(mime);
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// 通过response对象，获取到输出流
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ServletOutputStream outputStream = res.getOutputStream();
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// 定义输入流，通过输入流读取文件内容
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FileInputStream fileInputStream = new FileInputStream(file);
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int len = 0;
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byte[] bytes = new byte[1024];
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while ((len = fileInputStream.read(bytes)) != -1) {
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// 通过输入流读取文件数据，然后通过上述的输出流写回浏览器
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outputStream.write(bytes, 0, len);
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outputStream.flush();
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}
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// 关闭资源
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fileInputStream.close();
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outputStream.close();
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}
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/**
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* 获取文件扩展名
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*/
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public static String getExtension(String fileName) {
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if (StringUtils.isEmpty(fileName)) {
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return "";
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}
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int idx = fileName.lastIndexOf(POINT);
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if (idx == -1) {
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return "";
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}
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return fileName.substring(idx).toLowerCase();
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}
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/**
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* 获取多用途互联网邮件扩展类型
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*
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* @param ext 文件扩展名
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* @return MIME
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*/
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public static String getMime(String ext) {
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switch (ext) {
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// 图片
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case ".tif":
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case ".tiff":
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return "image/tiff";
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case ".img":
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return "application/x-img";
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case ".gif":
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return "image/gif";
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case ".jpg":
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case ".jpeg":
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return "image/jpeg";
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case ".png":
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return "image/png";
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// 音/视频
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case ".mp3":
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return "audio/mp3";
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case ".mp4":
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return "video/mpeg4";
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case ".avi":
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return "video/avi";
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case ".mpg":
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case ".mpeg":
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return "video/mpg";
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case ".wav":
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return "audio/wav";
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case ".wma":
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return "audio/x-ms-wma";
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case ".swf":
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return "application/x-shockwave-flash";
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case ".wmv":
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return "video/x-ms-wmv";
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case ".rm":
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return "application/vnd.rn-realmedia";
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case ".rmvb":
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return "application/vnd.rn-realmedia-vbr";
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// 网页
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case ".js":
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return "application/x-javascript";
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case ".css":
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return "text/css";
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case ".asp":
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return "text/asp";
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case ".mht":
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return "message/rfc822";
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case ".jsp":
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case ".htm":
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case ".html":
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case ".xhtml":
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return "text/html";
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case ".xml":
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case ".svg":
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return "text/xml";
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// 文件
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case ".txt":
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return "text/plain";
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case ".dbf":
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return "application/x-dbf";
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case ".mdb":
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return "application/msaccess";
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case ".pdf":
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return "application/pdf";
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case ".ppt":
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case ".pptx":
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return "application/x-ppt";
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case ".doc":
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case ".docx":
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return "application/msword";
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case ".xls":
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case ".xlsx":
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return "application/vnd.ms-excel";
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case ".dgn":
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return "application/x-dgn";
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case ".dwg":
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return "application/x-dwg";
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case ".ext":
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return "application/x-msdownload";
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// 默认
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default:
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return "application/octet-stream";
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}
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}
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}
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