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package com.yiboshi.science.utils;
import com.baomidou.mybatisplus.core.toolkit.IOUtils;
import org.springframework.http.ContentDisposition;
import org.springframework.http.MediaType;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.io.OutputStream;
public class FileDownloadUtil {
private static final MediaType MS_DOWNLOAD = new MediaType("application", "x-msdownload");
public static void download(InputStream inputStream, HttpServletRequest request, HttpServletResponse response,
String fileName){
BufferedInputStream br = null;
OutputStream out = null;
try{
boolean isIE = isIE(request);
//必须
response.setCharacterEncoding("utf-8");
response.setContentType(isIE ? MS_DOWNLOAD.toString() : MediaType.APPLICATION_OCTET_STREAM.toString());
response.addHeader("Content-Disposition", ContentDisposition.builder("attachment")
.filename(fileName)
.build().toString());
br = new BufferedInputStream(inputStream);
out = response.getOutputStream();
int len;
byte[] buf = new byte[1024];
while ((len = br.read(buf)) > 0){
out.write(buf, 0, len);
}
} catch (Exception e){
e.printStackTrace();
} finally {
IOUtils.closeQuietly(br);
IOUtils.closeQuietly(out);
}
}
public static boolean isIE(HttpServletRequest request) {
String[] IEBrowserSignals = {"MSIE", "Trident", "Edge"};
String userAgent = request.getHeader("User-Agent");
for (String signal : IEBrowserSignals) {
if (userAgent.contains(signal)){
return true;
}
}
return false;
}
}