Question

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    HttpSession session=request.getSession();

    PrintWriter out=response.getWriter();
    String examId=request.getParameter("source");
    session.setAttribute("dur",examId);
    String fileName = examId+".zip";
    List<String> filesListInDir = new ArrayList<String>();
    File dir = new File("C:/Temp/Answers");     // Our source file 
    File[] files = dir.listFiles();
    int flag=0;
    for(File file : files){
        if(file.isFile()){      
            response.setContentType("APPLICATION/zip");
            String disHeader = "zip";
            response.setHeader("Content-Disposition", disHeader);
            filesListInDir.add(file.getAbsolutePath());
            if(file.getName().equalsIgnoreCase(fileName)){
                flag = 1;
                session.setAttribute("fileName", file.getName());
                FileInputStream fileInputStream = new FileInputStream(file.getPath());  
                int i;   
                while ((i=fileInputStream.read()) != -1) {  
                out.write(i);   
                }   
                fileInputStream.close();   
                out.close();   
                }  
        }
        if(flag == 0){
            System.out.println("file not match");
            out.print("Answer is not uploaded");
        }
    }
}

Answer 1

您的代码中存在一些问题。

1-让我们假设您所读的内容已经是zip文件。在这种情况下，您应更改response.setContentType和response.setHeader部分，如下所示

    response.setContentType("application/zip"); 
    response.setHeader("Content-Disposition","inline; filename=" + fileName );

2-您在文件夹中循环并尝试为文件夹中的每个文件发送一次响应标头（contentType和内容处置）。这应该会生成一个＆＃34;已经发送的标题＆＃34;第一个文件发送后，服务器发生异常。所以你应该做这样的事情

int flag=0;
for(File file : files){
    if(file.isFile()){      
        filesListInDir.add(file.getAbsolutePath()); // what is the utility of this ??
        if(file.getName().equalsIgnoreCase(fileName)){
            flag = 1;
            response.setContentType("application/zip"); 
    response.setHeader("Content-Disposition","inline; filename=" + fileName );

            session.setAttribute("fileName", file.getName());
            FileInputStream fileInputStream = new FileInputStream(file.getPath());  
            int i;   
            while ((i=fileInputStream.read()) != -1) {  
               out.write(i);   
            }//closes while   
            fileInputStream.close();   
            out.close();   
            return; //you finished if you sent the file
         }  // closes if(file.getName().equalsIgnoreCase(fileName))
    } // closes if(file.isFile())

}// closes for

//following block moved after the for so it prints at most once
if(flag == 0){
    System.out.println("file not match");
    out.print("Answer is not uploaded");
}

我没有得到文件名i，使用文件输入法时的zip文件，o / p文件类型是文件，我想要同名的zip文件

1 个答案: