how to upload and download images in java?

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how to upload and download images in java?

what is the code for uploading and downloading images in java? how do I make a photo gallery through JSP? I want to create a photo gallery for each user which can be viewed by all users but can be updated and deleted by the creator. Please give me suggestions.

View Answers

March 14, 2011 at 3:17 PM

Upload and Download images:

1)page.jsp:

<%@ page language="java" %>
<HTML>
<HEAD><TITLE>Display file upload form to the user</TITLE></HEAD>
<BODY> <FORM ENCTYPE="multipart/form-data" ACTION="upload.jsp" METHOD=POST>
<br><br><br>
<center>
<table border="0" bgcolor=#ccFDDEE>
<tr>
<center>
<td colspan="2" align="center"><B>UPLOAD THE FILE</B><center></td>
</tr>
<tr>
<td colspan="2" align="center"> </td>
</tr>
<tr>
<td><b>Choose the file To Upload:</b></td>
<td><INPUT NAME="file" TYPE="file"></td>
</tr>
<tr>
<td colspan="2" align="center"> </td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" value="Send File"> </td>
</tr>
<table>
</center>
</FORM>
</BODY>
</HTML>

2)upload.jsp:

<%@ page import="java.io.*" %>
<%@ page import="java.sql.*" %>
<%@ page import="java.util.zip.*"%>
<%
String saveFile="";
String contentType = request.getContentType();
if((contentType != null)&&(contentType.indexOf("multipart/form-data") >= 0)){
DataInputStream in = new DataInputStream(request.getInputStream());
int formDataLength = request.getContentLength();
byte dataBytes[] = new byte[formDataLength];
int byteRead = 0;
int totalBytesRead = 0;
while(totalBytesRead < formDataLength){
byteRead = in.read(dataBytes, totalBytesRead,formDataLength);
totalBytesRead += byteRead;
}
String file = new String(dataBytes);
saveFile = file.substring(file.indexOf("filename=\"") + 10);
saveFile = saveFile.substring(0, saveFile.indexOf("\n"));
saveFile = saveFile.substring(saveFile.lastIndexOf("\\") + 1,saveFile.indexOf("\""));
int lastIndex = contentType.lastIndexOf("=");
String boundary = contentType.substring(lastIndex + 1,contentType.length());
int pos;
pos = file.indexOf("filename=\"");
pos = file.indexOf("\n", pos) + 1;
pos = file.indexOf("\n", pos) + 1;
pos = file.indexOf("\n", pos) + 1;
int boundaryLocation = file.indexOf(boundary, pos) - 4;
int startPos = ((file.substring(0, pos)).getBytes()).length;
int endPos = ((file.substring(0, boundaryLocation)).getBytes()).length;
File ff = new File(saveFile);
FileOutputStream fileOut = new FileOutputStream(ff);
fileOut.write(dataBytes, startPos, (endPos - startPos));
fileOut.flush();
fileOut.close();
%><Br><table border="2"><tr><td><b>You have successfully upload the file:</b>
<% out.println(saveFile);%></td></tr></table>
<%
Connection connection = null;
String connectionURL = "jdbc:mysql://localhost:3306/test";
ResultSet rs = null;
PreparedStatement psmnt = null;
FileInputStream fis;
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
connection = DriverManager.getConnection(connectionURL, "root", "root");
File f = new File(saveFile);
psmnt = connection.prepareStatement("insert into image(images) values(?)");
fis = new FileInputStream(f);
psmnt.setBinaryStream(1, (InputStream)fis, (int)(f.length()));
int s = psmnt.executeUpdate();
if(s>0){
System.out.println("Uploaded successfully !");
}
else{
System.out.println("Error!");
}
}
catch(Exception e){e.printStackTrace();}
}
%>
<a href="showimages.jsp">Download Image</a>

March 14, 2011 at 3:18 PM

3)showimages.jsp:

<%@ page import="java.sql.*,java.io.*,java.util.*" %> 
<HTML>
 <HEAD>
  <TITLE>Download Images</TITLE>
  </HEAD>

 <BODY>
   <br><br>
  <table align="center" border=0 width="200px">
   <tr>
    <td colspan=2 align="center"><b>Download Images</b></td>
  </tr>
  <tr><td colspan=2>&nbsp;</td></tr>
  <%

  String connectionURL = "jdbc:mysql://localhost:3306/test";
  Connection con=null;
  try{      
    Class.forName("com.mysql.jdbc.Driver").newInstance();
    con=DriverManager.getConnection(connectionURL,"root","root");
    Statement stmt=con.createStatement();
    String strQuery = "select id from image";
    ResultSet rs = stmt.executeQuery(strQuery);
    while(rs.next())
    {

      %>
      <tr style="background-color:#efefef;">
      <td><%=rs.getInt(1)%></td>
      <td>
<a href="images.jsp?imgid=<%=rs.getInt(1)%>">
<img src="images.jsp?imgid=<%=rs.getInt(1)%>" width="50" height="50">
</a></td>
      </tr>
      <%
    }
    rs.close();
    con.close();
    stmt.close();
  }
  catch(Exception e)
  {
    e.getMessage();
  }
  %>
 </table>
  </BODY>
</HTML>

4)images.jsp:

<%@ page import="java.sql.*,java.io.*,java.util.*" %> 
<%
String connectionURL = "jdbc:mysql://localhost:3306/test";
if(request.getParameter("imgid")!=null && request.getParameter("imgid")!="")
{
  int id =  Integer.parseInt(request.getParameter("imgid"));

  String filename = "image"+id+".jpg";
  Connection con=null;
  try{      
    Class.forName("com.mysql.jdbc.Driver").newInstance();
    con=DriverManager.getConnection(connectionURL,"root","root");      
    Statement st1=con.createStatement();
    String strQuery = "select images from image where id="+id;

    ResultSet rs1 = st1.executeQuery(strQuery);

    String imgLen="";
    if(rs1.next()){
      imgLen = rs1.getString(1);
       }  
    rs1 = st1.executeQuery(strQuery);
    if(rs1.next()){
      int len = imgLen.length();
      byte [] rb = new byte[len];
      InputStream readImg = rs1.getBinaryStream(1);
      int index=readImg.read(rb, 0, len);  
      st1.close();
      response.reset();
      response.setContentType("image/jpg");
      response.setHeader("Content-disposition","attachment; filename=" +filename);
      response.getOutputStream().write(rb,0,len); 
      response.getOutputStream().flush();        
    }
  }
  catch (Exception e){
    e.printStackTrace();
  }
}
%>

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