从JSP下载文件 [英] Download file from JSP
本文介绍了从JSP下载文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在JSP上编写了代码，该代码将显示远程托管服务器上的所有文件，当我单击该文件时，我应该能够下载它.什么是实现下载的最佳方法?
I wrote the code on JSP that will display all the files on Remote hosting server, when I click on the file, I should be able to download it. what the best way to implement download?
现在，该JSP可以向我显示该目录中的所有文件，例如->'C:/'
Right now, that JSP will able to show me all the files in that directory for example --> 'C:/'
感谢您的帮助
这是示例jsp页面
<%@ page import="java.io.*" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Report</title>
</head>
<body>
<h1>Files</h1>
<ul>
<%
String root = "c:/";
java.io.File file;
java.io.File dir = new java.io.File(root);
String[] list = dir.list();
if (list.length > 0) {
for (int i = 0; i < list.length; i++) {
file = new java.io.File(root + list[i]);
if (file.isFile()) {
%>
<li><a href="/<%=file.getAbsolutePath()+file.getName()%>" target="_top"><%=list[i]%>
</a><br>
<%
}
}
}
%>
</ul>
</body>
</html>
推荐答案
我在这里发布给任何在此寻找答案的人.
I am posting here for anybody here who looking for answer on it.
在JSP文件上，使用此链接
On JSP file, use this for link
<<li><a href="/reportFetch?filePath=<%=file.getAbsolutePath()%>&fileName=<%=file.getName()%>" target="_top"><%=list[i]%></a><br>
并创建servlet
and create the servlet
...
import javax.activation.MimetypesFileTypeMap;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/reportFetch")
public class Report extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
String filePath = request.getParameter("filePath");
String fileName = request.getParameter("fileName");
MimetypesFileTypeMap mimeTypesMap = new MimetypesFileTypeMap();
String mimeType = mimeTypesMap.getContentType(request.getParameter("fileName"));
response.setContentType(mimeType);
response.setHeader("Content-disposition", "attachment; filename=" + fileName);
OutputStream out = response.getOutputStream();
FileInputStream in = new FileInputStream(filePath);
byte[] buffer = new byte[4096];
int length;
while ((length = in.read(buffer)) > 0) {
out.write(buffer, 0, length);
}
in.close();
out.flush();
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
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