Java 下载图片

前端（web端）

$("#test2").click(function() {
location.href = layui.setter.apiUrl + "/authenticate/collective/download?fileName=" + data.userName + "-" + data.demolitionNum + "-待认证&imgUrl=" + data.route + "";}）

后端

@RequestMapping("download")
public ResultDataUtil text(String imgUrl, String fileName, HttpServletResponse response) {
String nameEnd = imgUrl.substring(imgUrl.indexOf("."));
makeImg(imgUrl, fileName.concat(nameEnd), response);
return null;

}

// 直接 下载图片 后台图片页面
public void makeImg(String imgUrl, String fileName, HttpServletResponse response) {
// URL地址
BufferedInputStream is = null;
BufferedOutputStream os = null;

try {
      /* FileOutputStream xie=new FileOutputStream("d://imgs2",true); */
      URL url = new URL(imgUrl);
      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(url.openConnection().getContentLength()));
      is = new BufferedInputStream(url.openStream());
      os = new BufferedOutputStream(response.getOutputStream());
      byte[] buff = new byte[2048];
      int bytesRead;
      while (-1 != (bytesRead = is.read(buff, 0, buff.length))) {
          os.write(buff, 0, bytesRead);
      }
      if (is != null)
          is.close();
      if (os != null)
          os.close();
  } catch (MalformedURLException e) {
      e.printStackTrace();
  } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
  } catch (IOException e) {
      e.printStackTrace();
  }

}