有没有一种通用的方法可以在jsp中下载所有类型的文件？

一尘不染

有没有一种通用的方法可以在jsp中下载所有类型的文件？

jsp

我想根据用户选择下载office文件，pdf文件，image文件，zip文件，dll文件，exe文件。因此，我想从jsp页面下载这些文件类型。

这是jsp代码片段：

<% 
String filename = "Sample1.docx"; 
String filepath = "e:\\temp\\"; 
response.setContentType("APPLICATION/OCTET-STREAM"); 
response.setHeader("Content-Disposition","attachment; filename=\"" + filename + "\"");

java.io.FileInputStream fileInputStream = new java.io.FileInputStream(filepath + filename);

int i; 
while ((i=fileInputStream.read()) != -1) {
    out.write(i); 
} 
fileInputStream.close();
%>

但是在下载Office文件，图像文件时，它会引起一些错误。当我打开下载的文件时，它显示“文件可能已损坏”。

有什么通用的方法可以在jsp中下载所有类型的文件？

阅读 204

2020-06-08

共1个答案

一尘不染

好的，从其他浏览器下载文件时会出现一些问题。我的示例照顾了MSIE和Mozilla类型的浏览器中所需的处理

public HttpServletResponse getFile (HttpServletRequest request ,HttpServletResponse httpServletResponse, .......){
          HttpServletResponse response = httpServletResponse;
          InputStream in =/*HERE YOU READ YOUR FILE AS BinaryStream*/

          String filename = "";
          String agent = request.getHeader("USER-AGENT");
          if (agent != null && agent.indexOf("MSIE") != -1)
          {
            filename = URLEncoder.encode(/*THIS IS THE FILENAME SHOWN TO THE USER*/, "UTF8");
            response.setContentType("application/x-download");
            response.setHeader("Content-Disposition","attachment;filename=" + filename);
          }
          else if ( agent != null && agent.indexOf("Mozilla") != -1)
          {
            response.setCharacterEncoding("UTF-8");
            filename = MimeUtility.encodeText(/*THIS IS THE FILENAME SHOWN TO THE USER*/, "UTF8", "B");
            response.setContentType("application/force-download");
            response.addHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
          }


          BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
          byte by[] = new byte[32768];
          int index = in.read(by, 0, 32768);
          while (index != -1) {
              out.write(by, 0, index);
              index = in.read(by, 0, 32768);
          }
          out.flush();

          return response;
}

看一下这个

更新

2020-06-08