java实现文件下载

前端window.location.href = url;

/**

* 下载文件
* @param filePath
* @param fileName
* @param response
* @return
*/
@RequestMapping("/downloadFile")
@ApiOperation(value="下载文件",httpMethod="GET",notes="下载文件")
public @ResponseBody String downloadFile(@ApiParam(value="文件路径")String filePath,@ApiParam(value="文件名称")String fileName,HttpServletResponse response){
File file = null;
try{
file = new File(filePath);
}catch(Exception e){
logger.info("error:"+e.getMessage());
return "文件不存在";
}

InputStream inputStream = null;
BufferedInputStream bis = null; 
BufferedOutputStream bos = null;

try {
inputStream = new FileInputStream(file);
response.setContentType("application/x-download");
response.setHeader("Content-disposition","attachment;filename="+ URLEncoder.encode(fileName, "utf-8"));//设置头部信息
    bis = new BufferedInputStream(inputStream);
    bos = new BufferedOutputStream(response.getOutputStream());
    int bytesRead = 0;
    byte[] buffer = new byte[8192];
        while((bytesRead = bis.read(buffer,0,8192))!=-1){
        bos.write(buffer, 0, bytesRead);
        }
        bos.flush();
} catch (Exception e) {
logger.info("error:"+e.getMessage());
}finally{
try {
if(inputStream!=null){
inputStream.close();
}
    if(bos!=null){
    bos.flush();
bos.close();
if(bis!=null){
bis.close();
}
    }
    } catch (IOException e) {
logger.info("error:"+e.getMessage());
}
    }
    return null;
}