FileDownloadUtil.java
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package com.daeucna.board.common;
import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.servlet.view.AbstractView;
public class FileDownloadUtil extends AbstractView {
public FileDownloadUtil() {
// 객체가 생성될 때 Content Type을 다음과 같이 변경
setContentType("application/download; charset=utf-8");
}
@Override
protected void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request, HttpServletResponse response) throws Exception {
@SuppressWarnings("unchecked")
Map<String, Object> fileInfo = (Map<String, Object>) model.get("fileInfo"); // 전송받은 모델(파일 정보)
String fileNameKey = (String) fileInfo.get("fileNameKey"); // 암호화된 파일명(실제 저장된 파일 이름)
String fileName = (String) fileInfo.get("fileName"); // 원본 파일명(화면에 표시될 파일 이름)
String filePath = (String) fileInfo.get("filePath"); // 파일 경로
File file = new File(filePath, fileNameKey);
response.setContentType(getContentType());
response.setContentLength((int) file.length());
// 브라우저, 운영체제정보
String userAgent = request.getHeader("User-Agent");
// IE
if (userAgent.indexOf("MSIE") > -1 || userAgent.indexOf("Trident") > -1) {
fileName = URLEncoder.encode(fileName, "UTF-8");
} else {
fileName = new String( fileName.getBytes("UTF-8"), "8859_1");
}
response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\";");
response.setHeader("Content-Transfer-Encoding", "binary");
OutputStream out = response.getOutputStream();
FileInputStream fis = null;
try {
fis = new FileInputStream(file);
FileCopyUtils.copy(fis, out);
} finally {
if(fis != null) {
fis.close();
}
}
out.flush();
}
}