package cc.mrbird.febs.common.core.utils;
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import cc.mrbird.febs.common.core.exception.FebsException;
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import cn.hutool.core.date.DateUtil;
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import cn.hutool.core.io.FileUtil;
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import cn.hutool.core.lang.Dict;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.web.multipart.MultipartFile;
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import javax.servlet.ServletOutputStream;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.*;
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import java.util.Date;
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import java.util.List;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipOutputStream;
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@Slf4j
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public class MyUtil {
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public static void downloadFile(File file, HttpServletResponse response) throws IOException {
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try (InputStream fin = new FileInputStream(file); ServletOutputStream out = response.getOutputStream()) {
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response.setCharacterEncoding("utf-8");
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response.setContentType("application/x-download");
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response.addHeader("Content-Disposition", "attachment;filename=resume.doc");
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byte[] buffer = new byte[1024];
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int bytesToRead = -1;
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// 通过循环将读入的Word文件的内容输出到浏览器中
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while ((bytesToRead = fin.read(buffer)) != -1) {
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out.write(buffer, 0, bytesToRead);
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}
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} catch (Exception e) {
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log.error("下载文件异常" + e);
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e.printStackTrace();
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}
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}
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public static void download(HttpServletRequest request, HttpServletResponse response, List<File> files , List<String> fileName){
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//设置压缩包的名字
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//解决不同浏览器压缩包名字含有中文时乱码的问题
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String downloadName ="PersonnelInformation-" + DateUtil.format(new Date(), "yyyyMMddhhmmsss") + ".zip";
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String agent = request.getHeader("USER-AGENT");
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try {
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if (agent.contains("MSIE") || agent.contains("Trident")) {
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downloadName = java.net.URLEncoder.encode(downloadName, "UTF-8");
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} else {
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downloadName = new String(downloadName.getBytes("UTF-8"), "ISO-8859-1");
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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response.setHeader("Content-Disposition", "attachment;fileName=\"" + downloadName + "\"");
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//设置压缩流：直接写入response，实现边压缩边下载
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ZipOutputStream zipos = null;
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try {
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zipos = new ZipOutputStream(new BufferedOutputStream(response.getOutputStream()));
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//设置压缩方法
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zipos.setMethod(ZipOutputStream.DEFLATED);
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} catch (Exception e) {
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log.error("设置压缩流出现异常" + e);
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e.printStackTrace();
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}
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//循环将文件写入压缩流
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DataOutputStream os = null;
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for (int i = 0; i < files.size(); i++) {
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File file = files.get(i);
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try {
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//添加ZipEntry，并ZipEntry中写入文件流
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//这里，加上i是防止要下载的文件有重名的导致下载失败
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zipos.putNextEntry(new ZipEntry(fileName.get(i)));
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os = new DataOutputStream(zipos);
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InputStream is = new FileInputStream(file);
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byte[] b = new byte[100];
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int length;
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while ((length = is.read(b)) != -1) {
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os.write(b, 0, length);
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}
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is.close();
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zipos.closeEntry();
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} catch (IOException e) {
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log.error("循环将文件写入压缩流出现异常" + e.getMessage());
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e.printStackTrace();
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}
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}
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//关闭流
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try {
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os.flush();
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os.close();
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zipos.close();
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} catch (IOException e) {
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log.error("关闭流现异常" + e.getMessage());
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e.printStackTrace();
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}
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}
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public static Dict filesUpload(MultipartFile file, String uploadPpath, String nextIdStr) throws FebsException, IOException {
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if (file.isEmpty()) {
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throw new FebsException("上传的文件不能为空！请重新上传");
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}
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if (file.getSize() <= 0) {
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throw new FebsException("上传的文件大小需要大于0kb");
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}
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if (file.getSize() > 50 * 1024* 1024) {
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throw new FebsException("上传的文件大于50M");
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}
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if (!FileUtil.exist(uploadPpath)) {
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FileUtil.mkdir(uploadPpath);
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}
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//原本名字
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String fileName = file.getOriginalFilename();
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String suffix = "";
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if (fileName.indexOf(".") > 0) {
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//后缀
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suffix = fileName.substring(fileName.indexOf("."), fileName.length());
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}
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//生成新的名字
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String newName = nextIdStr + suffix;
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//上传
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file.transferTo(new File(uploadPpath + newName));
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return Dict.create().set("fileName",fileName).set("suffix",suffix).set("newName",newName);
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}
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}
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