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How to store a particular data into project file

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posted 12 years ago

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Hi

I wants to store some files into the project, for that i have created a folder inside the project application.

Now i need to store some files dynamically at present iam giving the path of the folder to store like c:\\program files\\---\\--- like this iam storing but i not a right way i think but while iam giving project to client they can store the project in different location that time i will show error for time being i kept like this please help me to solve my problem .

Thanks in advance.

Vicky Vijay

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Posts: 125

posted 12 years ago

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Hi Arun,

Try using the below,

<%out.println(request.getRealPath(request.getServletPath()));%>

I hope this fits your requirement ..

P Arunkumar

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Posts: 119

posted 12 years ago

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Hi

Thanks for your reply but it is not working for me, below i have given my code please go through it and if i wants to change any thing please guide me.

Web.xml:

Hear i am give the path to store the files what iam uploading.

Now you can see the path to where iam telling the uploaded files to save but i have used method is not good because it is storing in local host, even though iam giving the project path its not a perfect.

Servlet code:

<%@ page import="java.io.*,java.util.*, javax.servlet.*,java.sql.*" %>
<%@ page import="javax.servlet.http.*" %>
<%@ page import="org.apache.commons.fileupload.*" %>
<%@ page import="org.apache.commons.fileupload.disk.*" %>
<%@ page import="org.apache.commons.fileupload.servlet.*" %>
<%@ page import="org.apache.commons.io.output.*" %>

<%
   File file ;
   int maxFileSize = 5000 * 2492013;
   int maxMemSize = 5000 * 2492013;
   ServletContext context = pageContext.getServletContext();
   String filePath = context.getInitParameter("file-upload");

// Verify the content type
   String contentType = request.getContentType();
   if ((contentType.indexOf("multipart/form-data") >= 0)) {

DiskFileItemFactory factory = new DiskFileItemFactory();
      // maximum size that will be stored in memory
      factory.setSizeThreshold(maxMemSize);
      // Location to save data that is larger than maxMemSize.
      factory.setRepository(new File("c:\\temp"));

// Create a new file upload handler
      ServletFileUpload upload = new ServletFileUpload(factory);
      // maximum file size to be uploaded.
      upload.setSizeMax( maxFileSize );

try{ 
         // Parse the request to get file items.
         List fileItems = upload.parseRequest(request);

// Process the uploaded file items
         Iterator i = fileItems.iterator();

out.println("<html>");
         out.println("<head>");
         out.println("<title>JSP File upload</title>");  
         out.println("</head>");
         out.println("<body>");
         while ( i.hasNext () ) 
         {
            FileItem fi = (FileItem)i.next();
            if ( !fi.isFormField () )	
            {
            // Get the uploaded file parameters
            String fieldName = fi.getFieldName();
            String fileName = fi.getName();
            boolean isInMemory = fi.isInMemory();
            long sizeInBytes = fi.getSize();
            // Write the file
            if( fileName.lastIndexOf("\\") >= 0 ){
            file = new File( filePath + 
            fileName.substring( fileName.lastIndexOf("\\"))) ;
            }else{
            file = new File( filePath + 
            fileName.substring(fileName.lastIndexOf("\\")+1)) ;
            }
            fi.write( file ) ;
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/blob_test", "root", "root");
            String INSERT_PICTURE = "insert into pictures(id, name, photo, File_name, Date,Time) values (?, ?, ?, ?, CURDATE(), CURTIME())";       
            
            String file_name = file.getName();
            FileInputStream fis = null;
            PreparedStatement ps = null;
            conn.setAutoCommit(false);
            fis = new FileInputStream(file);
            ps = conn.prepareStatement(INSERT_PICTURE);
            ps.setString(1, "026");
            ps.setString(2, "jenifer");
            ps.setBinaryStream(3, fis, (int) file.length());
            ps.setString(4, file_name);
            ps.executeUpdate();
            conn.commit();                    
            out.println("Uploaded Filename: " + 
            fileName + "<br>");
    
            out.println("filename :"+file_name);
                    
            }
         }
         out.println("</body>");
         out.println("</html>");
      }
      catch(Exception ex) {
         System.out.println(ex);
      }
   }else{
      out.println("<html>");
      out.println("<head>");
      out.println("<title>Servlet upload</title>");  
      out.println("</head>");
      out.println("<body>");
      out.println("<p>No file uploaded</p>"); 
      out.println("</body>");
      out.println("</html>");
   }
%>

jsp page :

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<Html>
<HEAD><TITLE>Display file upload form to the user</TITLE></HEAD>  
<% //  for uploading the file we used Encrypt type of multipart/form-data and input of file type to browse and submit the file %>
  <BODY> <FORM  ENCTYPE="multipart/form-data" ACTION= "upload.jsp" METHOD=POST>
                <br><br><br>
          <center><table border="2" >
                    <tr><center><td colspan="2"><p align=
"center"><B>PROGRAM FOR UPLOADING THE FILE</B><center></td></tr>
                    <tr><td><b>Choose the file To Upload:</b>
</td>
                    <td><INPUT NAME="F1" TYPE="file"></td></tr>
                                        <tr><td colspan="2">
<p align="right"><INPUT TYPE="submit" VALUE="Send File" ></p></td></tr>
             <table>
     </center>      
     </FORM>
</BODY>
</HTML>

My project is working fine but without error but now i have created one folder under WebContent i need to save the files in that folder not in D:\Eclipse\eclipse\WorkSpace like this how i can solve this problem. please help me. its so urgent.

Saurabh Pillai

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Posts: 541

posted 12 years ago

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You should never use absolute path, in your case, use relative path while doing file manipulation, look at HttpServletRequest.html#getContextPath.

I can see you are using Java code inside JSP. That is not a good practice. JSP is used for displaying contents and should not contain any Java code. Any Java code should be move to Java files i.e. Service classes according to MVC architecture. There are tons of benefits using right tool, one of them is maintenance.

Hope this helps. :)

Prasad Krishnegowda

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Posts: 672

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posted 12 years ago

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You tell servlet code, and show us JSP code.. That JSP is full of scriplets, which is a very bad practice. Are you using this JSP only as servlet in your application?

Senthil Manoharan

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posted 12 years ago

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you can use "/<Folder name>" or something like "../<Folder name>" for storing it in subfolder of the parent folder..

Thanks and Regards
Senthil Kumar M

P Arunkumar

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Posts: 119

posted 12 years ago

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Thanks for your reply

To solve this problem what i want to do, iam new to development field please guide me to solve this. i learned myself no one is not there to guide me so i did some mistake, to rectify the problem please help me.

Thanks in advance.

P Arunkumar

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Posts: 119

posted 12 years ago

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Hi

I have change my code into jsp+ servlet files but now iam facing some error please help me to solve, if iam doing mistake please intimate me.It is a file uploading concept.

Jsp Code:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<Html>
<HEAD><TITLE>Display file upload form to the user</TITLE></HEAD>  
<% //  for uploading the file we used Encrypt type of multipart/form-data and input of file type to browse and submit the file %>
  <BODY> <FORM  ENCTYPE="multipart/form-data" ACTION= "Upload" METHOD=POST>
                <br><br><br>
          <center><table border="2" >
                    <tr><center><td colspan="2"><p align=
"center"><B>PROGRAM FOR UPLOADING THE FILE</B><center></td></tr>
                    <tr><td><b>Choose the file To Upload:</b>
</td>
                    <td><INPUT NAME="F1" TYPE="file"></td></tr>
                                        <tr><td colspan="2">
<p align="right"><INPUT TYPE="submit" VALUE="Send File" ></p></td></tr>
             <table>
     </center>      
     </FORM>
</BODY>
</HTML>

My servlet file is Upload.java

import java.io.IOException;
import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.http.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.PrintWriter;
import java.util.Iterator;
import javax.servlet.*;
import javax.servlet.jsp.*;
import javax.servlet.resources.*;
import javax.servlet.GenericServlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.*;
import org.apache.commons.fileupload.disk.*;
import org.apache.commons.fileupload.servlet.*;
import org.apache.commons.io.output.*;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class Upload extends HttpServlet {
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    	 PrintWriter out = response.getWriter();
    	 File file ;
    	   int maxFileSize = 5000 * 2492013;
    	   int maxMemSize = 5000 * 2492013;
    	   ServletContext context = pageContext.getServletContext();
    	   String filePath = context.getInitParameter("file-upload");

// Verify the content type
    	   String contentType = request.getContentType();
    	   if ((contentType.indexOf("multipart/form-data") >= 0)) {

DiskFileItemFactory factory = new DiskFileItemFactory();
    	      // maximum size that will be stored in memory
    	      factory.setSizeThreshold(maxMemSize);
    	      // Location to save data that is larger than maxMemSize.
    	      factory.setRepository(new File("c:\\tmp"));

// Create a new file upload handler
    	      ServletFileUpload upload = new ServletFileUpload(factory);
    	      // maximum file size to be uploaded.
    	      upload.setSizeMax( maxFileSize );

try{ 
    	         // Parse the request to get file items.
    	         List fileItems = upload.parseRequest(request);

// Process the uploaded file items
    	         Iterator i = fileItems.iterator();

out.println("<html>");
    	         out.println("<head>");
    	         out.println("<title>JSP File upload</title>");  
    	         out.println("</head>");
    	         out.println("<body>");
    	         while ( i.hasNext () ) 
    	         {
    	            FileItem fi = (FileItem)i.next();
    	            if ( !fi.isFormField () )	
    	            {
    	            // Get the uploaded file parameters
    	            String fieldName = fi.getFieldName();
    	            String fileName = fi.getName();
    	            boolean isInMemory = fi.isInMemory();
    	            long sizeInBytes = fi.getSize();
    	            // Write the file
    	            if( fileName.lastIndexOf("\\") >= 0 ){
    	            file = new File( filePath + 
    	            fileName.substring( fileName.lastIndexOf("\\"))) ;
    	            }else{
    	            file = new File( filePath + 
    	            fileName.substring(fileName.lastIndexOf("\\")+1)) ;
    	            }
    	            fi.write( file ) ;
    	            Class.forName("com.mysql.jdbc.Driver");
    	            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/blob_test", "root", "root");
    	            String INSERT_PICTURE = "insert into pictures(id, name, photo, File_name, Date,Time) values (?, ?, ?, ?, CURDATE(), CURTIME())";       
    	            
    	            String file_name = file.getName();
    	            FileInputStream fis = null;
    	            PreparedStatement ps = null;
    	            conn.setAutoCommit(false);
    	            fis = new FileInputStream(file);
    	            ps = conn.prepareStatement(INSERT_PICTURE);
    	            ps.setString(1, "026");
    	            ps.setString(2, "jenifer");
    	            ps.setBinaryStream(3, fis, (int) file.length());
    	            ps.setString(4, file_name);
    	            ps.executeUpdate();
    	            conn.commit();                    
    	            out.println("Uploaded Filename: " + 
    	            fileName + "<br>");
    	    
    	            out.println("filename :"+file_name);
    	            String realPath = context.getRealPath("/WebContent/PDF-Files");
    	            File file1 = new File(realPath + File.separatorChar + fileName);

}
    	         }
    	         out.println("</body>");
    	         out.println("</html>");
    	      }
    	      catch(Exception ex) {
    	         System.out.println(ex);
    	      }
    	   }else{
    	      out.println("<html>");
    	      out.println("<head>");
    	      out.println("<title>Servlet upload</title>");  
    	      out.println("</head>");
    	      out.println("<body>");
    	      out.println("<p>No file uploaded</p>"); 
    	      out.println("</body>");
    	      out.println("</html>");
    	   }
	}

}

If you say that ServletContext context = pageContext.getServletContext(); in this line its showing error while compiling time cannot find symbol. then i kept
private GenericServlet pageContext;
ServletContext context = pageContext.getServletContext();
now its not showing error compilation fine but while running time its shows the error as
type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.NullPointerException
Upload.doPost(Upload.java:39)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.33 logs.

in eclipse.

web.xml:

<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
 
	<servlet>
		<servlet-name>WelcomeServlet</servlet-name>
		<servlet-class>WelcomeServlet</servlet-class>
	</servlet>
	<servlet>
		<description>
		</description>
		<display-name>Upload</display-name>
		<servlet-name>Upload</servlet-name>
		<servlet-class>
		Upload</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>WelcomeServlet</servlet-name>
		<url-pattern>/WelcomeServlet</url-pattern>
	</servlet-mapping>
	<servlet-mapping>
		<servlet-name>Upload</servlet-name>
		<url-pattern>/Upload</url-pattern>
	</servlet-mapping>
	<welcome-file-list>
		<welcome-file> /WebContent/form.jsp </welcome-file>
	</welcome-file-list>
	<context-param> 
	<param-name>file-upload</param-name> 
	<param-value>
        D:\Eclipse\eclipse\WorkSpace\final\WebContent\WEB-INF\PDF_Files
     </param-value> 
     </context-param>
	
</web-app>

If we wrote java code inside jsp file by scripting is not a good so i change my code please help me to solve my problem

Thanks in advance.

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