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springMVC文件下载

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传统io输出

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      @RequestMapping("/download")
public String download( String fileName ,String filePath, HttpServletRequest request, HttpServletResponse response){			 
	response.setContentType("text/html;charset=utf-8");
	try {
		request.setCharacterEncoding("UTF-8");
	} catch (UnsupportedEncodingException e1) {
		// TODO Auto-generated catch block
		e1.printStackTrace();
	}	
	java.io.BufferedInputStream bis = null;
	java.io.BufferedOutputStream bos = null;

	String downLoadPath = filePath;  //注意不同系统的分隔符
//	String downLoadPath =filePath.replaceAll("/", "\\\\\\\\");   //replace replaceAll区别 *****  
	System.out.println(downLoadPath);
	
	try {
		long fileLength = new File(downLoadPath).length();
		response.setContentType("application/x-msdownload;");
		response.setHeader("Content-disposition", "attachment; filename=" + new String(fileName.getBytes("utf-8"), "ISO8859-1"));
		response.setHeader("Content-Length", String.valueOf(fileLength));
		bis = new BufferedInputStream(new FileInputStream(downLoadPath));
		bos = new BufferedOutputStream(response.getOutputStream());
		byte[] buff = new byte[2048];
		int bytesRead;
		while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
			bos.write(buff, 0, bytesRead);
		}
	} catch (Exception e) {
		e.printStackTrace();
	} finally {
		if (bis != null)
			try {
				bis.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		if (bos != null)
			try {
				bos.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
	}
	return null;	
}

springmvc提供的ResponseEntit

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   @RequestMapping("/download")  
public ResponseEntity<byte[]> export(String fileName,String filePath) throws IOException {  
	
    HttpHeaders headers = new HttpHeaders();    
    File file = new File(filePath);
    
    headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);    
    headers.setContentDispositionFormData("attachment", fileName);    
   
    return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED);    
}