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File Uploading in Java, How to upload file in JSP and Servlet:-

using this concept of java we can upload external content or file into Java Web Application.
Java provides a File input element of HTML form to upload external files in the Java Web project.
The external file can be an image file, text file, audio file, or video file.

1) create a form for file uploading and the form should be 

 <form  enctype="multipart/form-data">


2)Create File Element using <input type="file"   name="any"  />


3)Now we will create Servlet and Write File Uploading code which is similar to File Handling Programming.

4) Add the Jar file to upload,cos.jar


Follow these links:-

https://github.com/shivaconceptsolution/FileUpload


Code of JSP For designing



<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <form action="UploadSer" name="frm1" method="post" enctype="multipart/form-data">
         
            <input type="file" name="file" />
            <br>
            <input type="submit" name="btnsubmit" value="Upload" />
         
         
        </form>
    </body>
</html>



2) Code For Servlet to upload data:-


import com.oreilly.servlet.MultipartRequest;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class UploadSer extends HttpServlet {

  hrows ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
           MultipartRequest m=new MultipartRequest(request,"E://upload");
           out.print("successfully uploaded");
        }
    }
}



How to upload multiple files in JSP and Servlet

File Uploading For Multiple File:-


JSP Code:-

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <form action="UploadSer" name="frm1" method="post" enctype="multipart/form-data">
           
            Enter name
            <br>
            <input type="text" name="txtname"  />
            <br>
            <br>
            Upload Text File
            <br>
            <input type="file" name="file" />
            <br>
            Upload Image File
            <br>
             <input type="file" name="file1" />
             <br>
            <input type="submit" name="btnsubmit" value="Upload" />
           
           
        </form>
    </body>
</html>

Servlet Code:-
 protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try  {
           MultipartRequest m=new MultipartRequest(request,"E://upload"); 
          /* Enumeration files = m.getFileNames();
           while (files.hasMoreElements())
                 {
                    
                      String name = (String)files.nextElement();
                      String filename = m.getFilesystemName(name);
                      String type = m.getContentType(name);
                      out.println("<BR>name: " + filename);
                      out.println("<BR>filename: " + filename);
                      out.println("<BR>type: " + type);
                   }*/
          out.print(m.getFilesystemName("file")+"<br>");
          out.print(m.getFilesystemName("file1")+"<br>");
          out.print(m.getParameter("txtname")+"<br>");
          // out.print("successfully uploaded");  
        }
        catch(Exception ex)
        {
            out.print(ex.getMessage());
        }
    }





File upload on database:-

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.oreilly.servlet.MultipartRequest;

/**
 * Servlet implementation class UploadSer
 */
@WebServlet("/UploadSer")
public class UploadSer extends HttpServlet {
private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public UploadSer() {
        super();
        // TODO Auto-generated constructor stub
    }

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter(); 
        
        try
{
       
    response.setContentType("text/html");
    MultipartRequest m=new MultipartRequest(request,getServletContext().getRealPath("/")+"upload");
    out.print(m.getFilesystemName("file")+"<br>");
    out.print(m.getContentType("file")+"<br>");
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/projectcrm","root","");
Statement st = con.createStatement();
int x = st.executeUpdate("insert into imgupload(path) values('"+m.getFilesystemName("file")+"')");
if(x!=0)
{
response.sendRedirect("fileupload.jsp");
//out.print("File uploaded Successfully");
}
con.close();
}
catch(Exception ex)
{
out.print(ex.getMessage().toString());
}
}

}


<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ page import="java.sql.*" %>    
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="UploadSer" method="post" enctype="multipart/form-data">
<input type="file" name="file"  />
<br>
<input type="submit" name="btnsubmit" value="Upload" />
</form> 

<%
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/projectcrm","root","");
Statement st = con.createStatement();
ResultSet x = st.executeQuery("select * from imgupload");
while(x.next())
{ %>
<img src="<%= "upload/"+x.getString(2) %>" width="100px" height="100px" />
<% }%>


</body>
</html>




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