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Download CSV File from Database in JSP
In this section, you will learn how to download
CSV file from database in JSP. In this example, we have developed
two files "viewcsv.jsp" and
"file_download.jsp" , code is given below.
Brief description of the flow of application :
1). Create a webpage "viewcsv.jsp""
to display and download the CSV file from database. All CSV file will show as
hyperlink.
2). Another "file_download.jsp" is used to
retrieve CSV file..
Step:1 To create a "file" table in Database.
create table `file` (
`id` double ,
`file_data` blob ,
`file_name` varchar (50)
)
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Step:2 Create a "viewcsv.jsp"
to display all the CSV file.
<html>
<body>
<br><br>
<table width="200px" style="border:1px solid #ff0000;background-color:f7f7f7" align="center">
<tr style="font-weight:bold;">
<td align="center" align="center" colspan=2 style="border-bottom: 2px solid #000000;">Download Csv File</td>
</tr>
<tr style="font-weight:bold;">
<td align="center" style="border-bottom: 2px solid #000000;">Id</td>
<td align="center" style="border-bottom: 2px solid #000000;">File</td>
</tr>
<%@ page import="java.io.*,java.util.*,java.sql.*" %>
<%
String connectionURL = "jdbc:mysql://localhost/application";
String url=request.getParameter("WEB_URL");
String Content=new String("");
Statement stmt=null;
Connection con=null;
try
{
Class.forName("com.mysql.jdbc.Driver").newInstance();
con=DriverManager.getConnection(connectionURL,"root","root");
stmt=con.createStatement();
String qry = "select * from file";
ResultSet rst= stmt.executeQuery(qry);
while(rst.next())
{
%>
<tr>
<td align="center"><%=rst.getInt(1)%></td>
<td align="center">
<a href="file_download.jsp?id=<%=rst.getInt(1)%>"><%=rst.getString(3)%></a>
</td>
</tr>
<%
}
}
catch(Exception e){
e.printStackTrace();
}
%>
</table>
</body>
</html>
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Step:3 To create a web page "file_download.jsp" .
<%@ page import="java.io.*,java.util.*,java.sql.*" %>
<%
int id=0;
if(request.getParameter("id")!=null && request.getParameter("id")!="")
{
id = Integer.parseInt(request.getParameter("id").toString());
}
String connectionURL = "jdbc:mysql://localhost/application";
String url=request.getParameter("WEB_URL");
String Content=new String("");
Statement stmt=null;
Connection con=null;
try
{
String filename="data"+id+".csv";
Class.forName("com.mysql.jdbc.Driver").newInstance();
con=DriverManager.getConnection(connectionURL,"root","root");
stmt=con.createStatement();
String qry = "select * from file where id="+id;
ResultSet rst= stmt.executeQuery(qry);
if(rst.next())
{
Content=rst.getString("file_data");
}
out.println(Content);
byte requestBytes[] = Content.getBytes();
ByteArrayInputStream bis = new ByteArrayInputStream(requestBytes);
response.reset();
response.setContentType("application/text");
response.setHeader("Content-disposition","attachment; filename=" +filename);
byte[] buf = new byte[1024];
int len;
while ((len = bis.read(buf)) > 0){
response.getOutputStream().write(buf, 0, len);
}
bis.close();
response.getOutputStream().flush();
}
catch(Exception e){
e.printStackTrace();
}
%>
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Output:
Display CSV file :
Download the CSV File :
Download the application
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