How to get client and server side IP address in JSP Page

Please visit my another blog
http://binodjava.blogspot.com/2009/06/how-to-get-client-and-server-ip-address.html

Thanks,

Binod Suman

Download the image from Servlet usign core java code

For download the image from Servlet usign core java code
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

public class Download {

public static void main(String args[]) throws Exception {
String url = "http://localhost:9080/mYWebApp/sendImage/Fashion/shirt.jpg";
URL u = new URL(url);
URLConnection uc = u.openConnection();
String contentType = uc.getContentType();
int contentLength = uc.getContentLength();
if (contentType.startsWith("text/")|| contentLength == -1) {
throw new IOException("This is not a binary file.");
}
InputStream raw = uc.getInputStream();
InputStream in = new BufferedInputStream(raw);
byte[] data = new byte[contentLength];
int bytesRead = 0;
int offset = 0;
while (offset < contentLength) {
bytesRead = in.read(data, offset, data.length - offset);
if (bytesRead == -1)
break;
offset += bytesRead;
}
in.close();

if (offset != contentLength) {
throw new IOException("Only read " + offset + " bytes; Expected " + contentLength + " bytes");
}

System.out.println("DATA :: "+u.getFile());
String filename = u.getFile().substring(u.getFile().lastIndexOf('/') + 1);
System.out.println("FILE NAME :: "+filename);
FileOutputStream out = new FileOutputStream(filename);
out.write(data);
out.flush();
out.close();
}
}

How to show Image on JSP page from My Computer Folder

Webpage NEVER allow the to access any local files. Means if you write <img src="c:\ImageFolder\Binod.jpg"/> in the jsp file, it will NOT work. (It can work only in some editor, but it will not work using internet explorer)
first.jsp
<html>
<head>
<title>Binod Show Image</title>
</head>
<body>
<h1> BINOD FROM IMAGE SHOW PROJECT </h1>
<img src="c:\ImageFolder\Binod.jpg" width="100" height="100"/></body>
</html>
It will not work.
Then how to show Image on JSP page from local computer drive.
SOLUTION: You have to use servlet to show image on jsp file
1. Servlet SendImage.java
2. first.jsp
3. Change in web.xml
SendImage.java
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.ResourceBundle;
import java.util.StringTokenizer;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class SendImage extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
static final long serialVersionUID = 1L;
String image_name = "";
ResourceBundle props = null;
String filePath = "";
private static final int BUFSIZE = 100;
private ServletContext servletContext;
public SendImage() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("FROM SERVLET");
sendImage(getServletContext(), request, response);
}
public void sendImage(ServletContext servletContext,
HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.servletContext = servletContext;
String reqUrl = request.getRequestURL().toString();
StringTokenizer tokens = new StringTokenizer(reqUrl, "/");
int noOfTokens = tokens.countTokens();
String tokensString[] = new String[noOfTokens];
int count = 0;
while (tokens.hasMoreElements()) {
tokensString[count++] = (String) tokens.nextToken();
}
String folderName = tokensString[noOfTokens - 2];
image_name = tokensString[noOfTokens - 1];
filePath = "/" + folderName + "/" + image_name;
String fullFilePath = "c:/ImageFolder" + filePath;
System.out.println("FULL PATH :: "+fullFilePath);
// doShowImageOnPage(fullFilePath, request, response);
doDownload(fullFilePath, request, response);
}
private void doShowImageOnPage(String fullFilePath,
HttpServletRequest request, HttpServletResponse response)
throws IOException {
response.reset();
response.setHeader("Content-Disposition", "inline");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Expires", "0");
response.setContentType("image/tiff");
byte[] image = getImage(fullFilePath);
OutputStream outputStream = response.getOutputStream();
outputStream.write(image);
outputStream.close();
}
private void doDownload(String filePath, HttpServletRequest request,
HttpServletResponse response) throws IOException {
File fileName = new File(filePath);
int length = 0;
ServletOutputStream outputStream = response.getOutputStream();
// ServletContext context = getServletConfig().getServletContext();
ServletContext context = servletContext;
String mimetype = context.getMimeType(filePath);
response.setContentType((mimetype != null) ? mimetype
: "application/octet-stream");
response.setContentLength((int) fileName.length());
response.setHeader("Content-Disposition", "attachment; filename=\""
+ image_name + "\"");
byte[] bbuf = new byte[BUFSIZE];
DataInputStream in = new DataInputStream(new FileInputStream(fileName));
while ((in != null) && ((length = in.read(bbuf)) != -1)) {
outputStream.write(bbuf, 0, length);
}
in.close();
outputStream.flush();
outputStream.close();
}
private byte[] getImage(String filename) {
byte[] result = null;
String fileLocation = filename;
File f = new File(fileLocation);
result = new byte[(int)f.length()];
try {
FileInputStream in = new FileInputStream(fileLocation);
in.read(result);
}
catch(Exception ex) {
System.out.println("GET IMAGE PROBLEM :: "+ex);
ex.printStackTrace();
}
return result;
}
}
2. first.jsp
<html><head><title>Binod Show Image</title></head><body><h1> BINOD FROM IMAGE SHOW PROJECT </h1>
<img src="http://localhost:8080/ImageShow/SendImage/12/Binod.jpg" width="100" height="100"/>
</body></html>
3. Update in web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" 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%22&gt;
<display-name> ImageShow</display-name>
<servlet>
<description> </description> <display-name> SendImage</display-name>
<servlet-name>SendImage</servlet-name>
<servlet-class> SendImage</servlet-class>
</servlet> <servlet-mapping> <servlet-name>SendImage</servlet-name>
<url-pattern>/SendImage/*</url-pattern> </servlet-mapping>
</web-app>

use this URL, now its work. :)
http://localhost:8080/ImageShow/first.jsp

How to make servlet for dowload image option

Suppose you have to write one serlvet, who would be give the download the image as save or open option.

This servelt should pick up the image as per the URL parameter from local drive and give the option of save or option image on your disk.

1. Make one Servlet SendImage

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class SendImage extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {

private SendImageHelper sendImageHelper;

public SendImage() {
super();
sendImageHelper = new SendImageHelper();
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
sendImageHelper.sendImage(getServletContext(),request,response);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}

}
2. One java file SendImageHelper.java

package com.tgt.image.sendimage.service;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.ResourceBundle;
import java.util.StringTokenizer;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class SendImageHelper {

String image_name = "";
List imageTypes = new ArrayList();
List numbers = new ArrayList();
ResourceBundle props = null;
String filePath = "";

private static final int BUFSIZE = 100;
private ServletContext servletContext;

public void sendImage(ServletContext servletContext,HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
this.servletContext = servletContext;
String reqUrl = request.getRequestURL().toString();
StringTokenizer tokens = new StringTokenizer(reqUrl,"/");
int noOfTokens = tokens.countTokens();
String tokensString[] = new String[noOfTokens];
int count=0;
while(tokens.hasMoreElements()){
tokensString[count++] = (String)tokens.nextToken();
}

String folderName = tokensString[noOfTokens-2];
image_name = tokensString[noOfTokens-1];
filePath="/"+folderName+"/"+image_name;
fullFilePath = "c:/ImageFolder"+filePath;
//doShowImageOnPage(fullFilePath, request, response);
doDownload(fullFilePath, request, response);
}

private void doShowImageOnPage(String fullFilePath,HttpServletRequest request, HttpServletResponse response) throws IOException {
response.reset();
response.setHeader("Content-Disposition", "inline" );
response.setHeader("Cache-Control","no-cache");
response.setHeader("Expires","0");
response.setContentType("image/tiff");
byte[] image = getImage(fullFilePath);
OutputStream outputStream = response.getOutputStream();
outputStream.write(image);outputStream.close();
}

private void doDownload(String filePath,HttpServletRequest request, HttpServletResponse response) throws IOException {
File fileName = new File(filePath);
int length = 0;
ServletOutputStream outputStream = response.getOutputStream();
//ServletContext context = getServletConfig().getServletContext();
ServletContext context = servletContext;
String mimetype = context.getMimeType(filePath);

response.setContentType( (mimetype != null) ? mimetype : "application/octet-stream" );
response.setContentLength( (int)fileName.length() );
response.setHeader( "Content-Disposition", "attachment; filename=\"" + image_name + "\"" );

byte[] bbuf = new byte[BUFSIZE];
DataInputStream in = new DataInputStream(new FileInputStream(fileName));
while ((in != null) && ((length = in.read(bbuf)) != -1)){
outputStream.write(bbuf,0,length);
}

in.close();
outputStream.flush();
outputStream.close();
}

}

How to start the Adobe FLEX

Please visit my another blog: http://binodsumanflex.blogspot.com/

How to show Image on Pop Up Window using Servlet

When you want to show the image on pop up using JSP from your local drive, then you will feel the problem. Actually you can not show any file from local drive in pop up due to security reason. Then you have the servlet option to show the image on pop up window from local drive location.
I am giving step by step solution:

1. create one servlet MyServletImage.java

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MyServletImage extends HttpServlet implements Servlet {
public MyServletImage() { super(); }
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.reset();
String imagePath=request.getParameter("myPath");
System.out.println("Image File Name :: "+imagePath);
response.setHeader("Content-Disposition", "inline" );
response.setHeader("Cache-Control","no-cache");
response.setHeader("Expires","0");
response.setContentType("image/tiff");
byte[] image = getImage(imagePath);
OutputStream outputStream = response.getOutputStream();
outputStream.write(image);outputStream.close();
System.out.println("DO GET METHOD");
}

private byte[] getImage(String filename) {
byte[] result = null;
String fileLocation = filename;
File f = new File(fileLocation);
result = new byte[(int)f.length()];
try {
FileInputStream in = new FileInputStream(fileLocation);
in.read(result);
}
catch(Exception ex) {
System.out.println("GET IMAGE PROBLEM :: "+ex);
ex.printStackTrace();
}
return result;
}
protected void doPost(HttpServletRequest arg0, HttpServletResponse arg1) throws
ServletException, IOException { }
}

2. ImageSource.jsp

<html>
<head>
<title>First Spring App</title>
</head>
<body>
<script language="JavaScript">
function myPage(fileLocation){
var url1="ImagePopUp.jsp?myPath="+fileLocation;
window.open(url1,"","width=550,height=400,status=yes,toolbar=no,menubar=no");
}
</script>
<input type="button" value="Get Picture First " onclick="myPage('e:\\Camera_Size_Reduced\\binod\\Binod_Apr08.jpg')"/> <br>
<input type="button" value="Get Picture Second" onclick="myPage('e:\\Camera_Size_Reduced\\binod\\DSC00072.JPG')"/> <br>
</body>
</html>

3. ImagePopUp.jsp

<h1 TO SHOW THE PICTURE HERE 3 </h1>
<%
String path1 = request.getParameter("myPath");
%>
<img src="http://localhost:9080/HSQLDB_TEST1/MyServletImage?myPath=<%=path1%>/>

How to set up HSQLDB for your project

Please visit my another blog http://binodsuman.blogspot.com/