文件下载方法

最新推荐文章于 2021-06-05 00:21:01 发布

荒唐的程序猿

最新推荐文章于 2021-06-05 00:21:01 发布

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CC 4.0 BY-SA版权

文章标签： spring mvc web

本文链接：https://blog.youkuaiyun.com/pangliang_csdn/article/details/51506874

本文介绍了一个Java实现的文件下载工具方法，该方法通过设置HTTP响应头来实现浏览器中文件的下载功能。支持不同文件大小情况下的处理，并确保了资源的正确关闭。

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import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import javax.servlet.http.HttpServletResponse;

/**
*
* @author yl
*
*/
public class FileDownloadUtil {
   /**
   * <p>
   * 文件下载工具方法
   * </p>
   *
   * @param fileName 文件名
   * @param downloadPath 文件路径
   * @param response
   * @throws Exception
   */
   public static void modelDownload(String fileName, String downloadPath,
           HttpServletResponse response) throws Exception {
       BufferedInputStream bis = null;
       BufferedOutputStream bos = null;
       try {
           long fileLength = new File(downloadPath).length();

           if(fileLength>0){
               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[1024];
               int bytesRead;
               while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
                   bos.write(buff, 0, bytesRead);
               }
           }else{
               response.setContentType("application/x-msdownload;");
               response.setHeader("Content-disposition", "attachment; filename=文件不存在！");
               response.setHeader("Content-Length", String.valueOf(fileLength));
               System.out.println("文件不存在！"+downloadPath);
           }
       } catch (IOException e) {
           e.printStackTrace();
       } finally {
           if (bis != null) {
               bis.close();
           }
           if (bos != null) {
               bos.close();
           }
       }
   }
}