Uploading Image in jsp, java, Netbeans

i had spent a lot of time for uploading an image in jsp page.so to help you guys i am writing this blog.
the way to upload the desired image is as below(neteans project)

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1. Put the image file in web folder(where all the web pages are placed.)
2. Wright the code

 <%String s=request.getContextPath() + "/abc.JPG";%>

<img src="<%=s%>" width = "500" hight = "600" aligh = "center" />

3. Mention the extensions of image carefully i.e(.jpeg, jpg are not treated as same)

for any other query keep posting.
Good Luck!!!

Watch video
https://youtu.be/sX0XAROhuiQ

Create and display dynamic Chart in JSP using Database inputs(jFreeChart Library)

 JSP code that generates chart of database(Time-Speed  which was my application requirement) and returns chart image whenever called

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-Watch video
https://youtu.be/sX0XAROhuiQ

<%// required packages  %>

<%@ page import="java.awt.Image" %>

<%@ page import="java.awt.*"%>

<%@ page import="java.text.SimpleDateFormat"%>

<%@ page import="java.awt.BasicStroke"%>

<%@ page import ="org.jfree.ui.ApplicationFrame"%>

<%@ page import="java.io.*" %>

<%@ page import="java.io.File"%>

<%@ page import="org.jfree.chart.*" %>

<%@ page import="org.jfree.chart.axis.*" %>

<%@ page import="org.jfree.chart.entity.*" %>

<%@ page import="org.jfree.chart.labels.*" %>

<%@ page import="org.jfree.chart.plot.*" %>

<%@ page import="org.jfree.chart.renderer.category.*" %>

<%@ page import="org.jfree.chart.urls.*" %>

<%@ page import="org.jfree.data.category.*" %>

<%@ page import="org.jfree.data.general.*" %>

<%@ page import="org.jfree.data.time.Minute"%>

<%@ page import="org.jfree.data.time.Hour"%>

<%@ page import="org.jfree.data.time.TimeSeries"%>

<%@ page import="org.jfree.data.time.TimeSeriesCollection"%>

<%@ page import="org.jfree.data.xy.XYDataset"%>

<%@ page import="org.jfree.chart.plot.XYPlot"%>

<%@ page import="org.jfree.chart.renderer.xy.StandardXYItemRenderer"%>

<%@ page import="org.jfree.chart.renderer.xy.XYItemRenderer"%>

 <%@ page import=  "java.sql.Connection" %>

<%@ page import  ="java.sql.DriverManager" %>

<%@ page import = "java.sql.SQLException" %>

<%@ page import = "java.sql.PreparedStatement" %>

<%@ page import = "java.sql.ResultSet" %>

<%@ page import = "java.sql.Statement" %>

 <%@ page import=  "javax.servlet.*" %>

<%@ page import  ="javax.servlet.http.*" %>



<%@ page import="java.awt.image.BufferedImage"%>

<%

 try

 {

 File image = File.createTempFile("image", "tmp");



 //chart class instance

Fms fm = new Fms("Graph");



JFreeChart chart = fm.createChart(fm.dataset);

 ChartUtilities.saveChartAsPNG(image, chart, 500, 400);

//get input stream

 FileInputStream fileInStream = new FileInputStream(image);

//output stream foe returning chart as image

 OutputStream outStream = response.getOutputStream(); 

 long fileLength;

 byte[] byteStream;

 fileLength = image.length();

 byteStream = new byte[(int)fileLength];

//read chart image

 fileInStream.read(byteStream, 0, (int)fileLength);

//returns chart image whenever called

 response.setContentType("image/png");

 response.setContentLength((int)fileLength);

 response.setHeader("Cache-Control","no-store,no-cache, must-revalidate, post-check=0, pre-check=0");

 response.setHeader("Pragma", "no-cache");

 fileInStream.close();

 outStream.write(byteStream);

 outStream.flush();

 outStream.close();

 }

 catch (IOException e)

 {

 System.err.println("Problem occurred creating chart.");

 }

%>

<%! public class Fms extends ApplicationFrame {   

//Main class

   XYDataset dataset= null;

   public Fms(final String title) {

        super(title);

      dataset= createDataset();

        final JFreeChart chart = createChart(dataset);

        final ChartPanel chartPanel = new ChartPanel(chart);

        chartPanel.setPreferredSize(new java.awt.Dimension(700, 570));

        chartPanel.setMouseZoomable(true, false);

        setContentPane(chartPanel);

    } 

//chart creation method

   JFreeChart createChart(final XYDataset dataset) {

        final JFreeChart chart = ChartFactory.createTimeSeriesChart(

            "Speed Chart",

            "Time",

            "Speed",

            dataset,

            true,

            true,

            false

        );

        chart.setBackgroundPaint(Color.white);

       final XYPlot plot = chart.getXYPlot();

        plot.setBackgroundPaint(Color.lightGray);

        plot.setDomainGridlinePaint(Color.white);

        plot.setRangeGridlinePaint(Color.white);

        plot.setDomainCrosshairVisible(true);

        plot.setRangeCrosshairVisible(false);

        final XYItemRenderer renderer = plot.getRenderer();

        if (renderer instanceof StandardXYItemRenderer) {

            final StandardXYItemRenderer rr = (StandardXYItemRenderer) renderer;

            rr.setShapesFilled(true);

            renderer.setSeriesStroke(0, new BasicStroke(1.0f));

            renderer.setSeriesStroke(1, new BasicStroke(1.0f));

           }       

        final DateAxis axis = (DateAxis) plot.getDomainAxis();

        axis.setDateFormatOverride(new SimpleDateFormat("dd:MM")); 

        try{

        final ChartRenderingInfo info = new ChartRenderingInfo

(new StandardEntityCollection());

final File file1 = new File("c:/Documents and Settings/accounts/WebApplication2/web/barchart.png");

ChartUtilities.saveChartAsPNG(file1, chart, 600, 400, info);

        }catch(Exception e){}

        return chart;

    }   

//data set generation method

    private XYDataset createDataset() {

        final TimeSeriesCollection dataset = new TimeSeriesCollection();

        dataset.setDomainIsPointsInTime(true);       

        final TimeSeries s1 = new TimeSeries("Series 1", Minute.class);

         int str = 0;

         int i =0,j= 0 ;

         String str1 = null;

        try{             

      Class.forName("sun.jdbc.odbc.JdbcOdbc"); 

      Connection con=DriverManager.getConnection("jdbc:odbc:FMSDB",null,null);

      PreparedStatement st;   

      Statement stmt = con.createStatement(); 

      String query = "Select * from Job_Status";

      stmt.executeQuery(query);

       ResultSet rs = stmt.executeQuery(query);       

           while( rs.next() )

        {                 

         str1= rs.getString("Time");

         String sa = str1.substring(11,13);

         String ha = str1.substring(14,16);

        str= rs.getInt("Speed"); 

        j=Integer.parseInt(sa);

        i=Integer.parseInt(ha);

        String date = rs.getString("Date");

        String y = date.substring(0,4);

         String m = date.substring(5,7);

          String d = date.substring(8,10);

         s1.add(new Minute(i, j, Integer.parseInt(d), Integer.parseInt(m), Integer.parseInt(y)), str);

          }

          }

          catch(Exception e)

          {             

          }

         System.out.println(str1.substring(11,13));

          System.out.println(str1.substring(14,16)+"\t"+str1);                 

        dataset.addSeries(s1);   

        return dataset;

    }

    }

%>

HTML Code for calling this JSP file
exp.jsp is the name of above jsp code file in my application

<html>

<body>

<img src="exp.jsp" alt="Progress chart" />

</body>

</html>

Note: To implement this code you will need jFreeChart Library from jFree Org.

Watch video
https://youtu.be/sX0XAROhuiQ

Reading Data from comm port in Java

This code first write 0x80 to COM port () then it reads 0x32 from COM port and then sends 6 more bytes and to terminate the packet it receives  0x70 form COM port.

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This code can be very helpful to communicate with embedded devices which communicate with PC through COM port.

-Watch video
https://youtu.be/sX0XAROhuiQ

// library import

import java.io.*;


import java.util.*;

import javax.comm.*;

import java.sql.Connection;

import  java.sql.DriverManager;

import java.sql.SQLException;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.Statement;





public class Fms implements Runnable{ 



static Enumeration portList;

static CommPortIdentifier portId;

static SerialPort serialPort;

static OutputStream outputStream;

static InputStream inputStream;

static Thread readThread,dataBase;

static int crf;

static int cwf;

static byte cxc[] = new byte[4];

static int cxm = 128;//0x80

static byte[] creadBuffer;//1byte read

static int creadBuff[]; 

write rt=new write();

static read rd;   

public void run() {

    };

    public static void main(String[] args) {

        int a=10;

        write wr = new write();

        read rd = new read(1);

         int b = 0;

        int speed=0,tcount=0,jcount=0,status=0;

      while(b!=10){      

       for(int j =0 ; j<=1;j++){

            try{

        wr.cwritemain(a); 

         rd.cmainx(a);          

         readThread.sleep(1000);

            }

            catch(Exception e){}

            if(j==0){

                status =creadBuff[1];

                jcount =creadBuff[5];

          System.out.println("results : "+status +"\t"+jcount); 

            }

            if(j==1){

                speed =creadBuff[1]*256+creadBuff[2];//to convert received data in decimal

                tcount =creadBuff[6];

          System.out.println("results : "+speed +"\t"+tcount); 

            }

             }    

    }            

       }





 static class write{        



         public void cwritemain(int m)


  {       

             cwf = m;

             cxc[0] = 0x26;

             portList = CommPortIdentifier.getPortIdentifiers();

             System.out.println(portList.hasMoreElements());

   while (portList.hasMoreElements()) {                                   

                                        portId = (CommPortIdentifier) portList.nextElement();

                                        if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {

                                    

     if (portId.getName().equals("COM1"))

     {                                  

      try {

       serialPort = (SerialPort) portId.open("SimpleWriteApp32", 2000);

                                                  } catch (PortInUseException e) {

      }

      try {

       outputStream = serialPort.getOutputStream();



      } catch (Exception e) {

      }

      try {

       serialPort.setSerialPortParams(9600,

         SerialPort.DATABITS_8,

         SerialPort.STOPBITS_1,

         SerialPort.PARITY_NONE);

      } catch (Exception e) {

      }

                                               if(cwf==10){

       try {      

        outputStream.write(cxm);// 0x80 written   

        serialPort.close();

                                                                outputStream.close();        

       } catch (Exception e) {

       }

                                               }

                                        }

                                }

                        }

         }        

    }   

   static class read implements SerialPortEventListener{

      public read(int s) {}

      public void cmainx(int cp) {

   crf = 10;

   portList = CommPortIdentifier.getPortIdentifiers();

   while (portList.hasMoreElements()) {

    portId = (CommPortIdentifier) portList.nextElement();

    if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {

     if (portId.getName().equals("COM1")) {

      try {

                                                    serialPort = (SerialPort) portId.open("readapp32",

         2000);

      } catch (PortInUseException e) {

       System.out.println(e.getMessage());

      }

      try {

       inputStream = serialPort.getInputStream();     

      } catch (Exception e) {

       System.out.println(e);

      }

      try {

       serialPort.addEventListener(this);

      } catch (Exception e) {

       System.out.println(e);

      }

      serialPort.notifyOnDataAvailable(true);

      try {

       serialPort.setSerialPortParams(9600,

         SerialPort.DATABITS_8,

         SerialPort.STOPBITS_1,

         SerialPort.PARITY_NONE);                                                

      } catch (Exception e) {

       System.out.println(e);

      }

     }

    }

   }                       

  }

        public void serialEvent(SerialPortEvent event) {            

            switch (event.getEventType()) {

   case SerialPortEvent.DATA_AVAILABLE:

    creadBuffer = new byte[8];

                                creadBuff= new int[8];

    try {

                                   int i = 0;                               

     while (inputStream.available() > 0) {       

                                          creadBuff[i]=inputStream.read();

  
                                        System.out.println("Data 
available is: "+creadBuff[i]);                                          
        

                                               i++;

     }

                                      inputStream.close();

    } catch (IOException e) {

    }

                                System.out.println("event");

    System.out.println("recieved \t"+creadBuffer[0] );

    if (creadBuffer[0] == 0x70) {

                                    System.out.println("Got 0x70"+creadBuffer[0] );

     serialPort.close();

     rd = new read(5);

     rd.cmainx(1);// ag

                                }

                                if (creadBuffer[0] == 0x32) {

                                    System.out.println("Got"+creadBuffer[0] );

     serialPort.close();                                

                                }

                                serialPort.close();

            }

        }

   }  



   }







Watch video



https://youtu.be/sX0XAROhuiQ