idautomationservlet.java

著名IDAutomation公司的JAVA条码控件源码

//*****************************************************************
//
//  JAVA Source for com.idautomation.pdf417; 4.10
//
//  Copyright, IDAutomation.com, Inc. 2000-2004.
//  All rights reserved.
//
//  http://www.IDAutomation.com/java/
//
//  NOTICE:
//  You may incorporate our Source Code in your application
//  only if you own a valid Java Developer License
//  from IDAutomation.com, Inc. and the copyright notices
//  are not removed from the source code.
//
//*****************************************************************

package com.idautomation.barcode.pdf417;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.awt.Graphics2D.*;
import java.awt.*;

import com.idautomation.barcode.encoder.GifEncoder;

public class IDAutomationServlet extends HttpServlet
{
	private boolean debug=false;
	public void init() throws ServletException { }
	// MODIFY THIS FUNCTION TO CREATE THE PDF417 USING THE request PARAMETERS
	private PDF417 getChart (HttpServletRequest request)
	{
		PDF417 cb=new PDF417();
		if (request!=null)
		{
			if (request.getParameter("X")!=null) cb.X=new Double(request.getParameter("X")).doubleValue();
			if (request.getParameter("XYR")!=null) cb.XtoYRatio=new Integer(request.getParameter("XYR")).intValue();
			if (request.getParameter("COL")!=null) cb.PDFColumns=new Integer(request.getParameter("COL")).intValue();
			if (request.getParameter("ECL")!=null) cb.PDFECLevel=new Integer(request.getParameter("ECL")).intValue();
			if (request.getParameter("XYR")!=null) cb.XtoYRatio=new Integer(request.getParameter("XYR")).intValue();
			if (request.getParameter("LEFT_MARGIN")!=null) cb.leftMarginCM=new Double(request.getParameter("LEFT_MARGIN")).doubleValue();
			if (request.getParameter("TOP_MARGIN")!=null) cb.topMarginCM=new Double(request.getParameter("TOP_MARGIN")).doubleValue();
			if (request.getParameter("PT")!=null) cb.processTilde=(request.getParameter("PT").compareTo("Y")==0);
			if (request.getParameter("TRN")!=null) cb.truncated=(request.getParameter("TRN").compareTo("Y")==0);
			String st = null;
			if (request.getParameter("MODE")!=null)
			{
				st = (request.getParameter("MODE"));
				if (st.compareTo("BINARY")==0)			cb.PDFMode=0;
				if (st.compareTo("TEXT")==0)			cb.PDFMode=1;
			}
			if (request.getParameter("ROTATE")!=null) cb.rotate=new Integer(request.getParameter("ROTATE")).intValue();
			if (request.getParameter("BARCODE")!=null) cb.code=request.getParameter("BARCODE");
		}
		else
		{
			cb.code="No Data";
		}
		return cb;
	}

	// Handle a request
	// 1. create PDF417
	// 2. draw PDF417 in a Buffered Image
	// 3. encode image as GIF or JPEG and send it to the browser
	public void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
	{
		PrintWriter out;
		ServletOutputStream outb;
		String encode="jpeg";
		if (request!=null)
		{
			if (request.getParameter("FORMAT")!=null)  encode=request.getParameter("FORMAT").toLowerCase();
			if (encode.compareTo("gif")!=0) encode="jpeg";
		}
		response.setContentType("image/"+encode);
		outb=response.getOutputStream();
		// avoid caching in browser
		response.setHeader ("Pragma", "no-cache");
		response.setHeader ("Cache-Control", "no-cache");
		response.setDateHeader ("Expires",0);
		try
		{	// Create buffer
			//the default height and width if not specified.
			int w=200;
			int h=80;
			// get PDF417
			PDF417 cb=getChart(request);
			if ((request!=null) && (request.getParameter("WIDTH")!=null) && (request.getParameter("HEIGHT")!=null))
			{
				w=new Integer(request.getParameter("WIDTH")).intValue();
				h=new Integer(request.getParameter("HEIGHT")).intValue();
			}
			else
			{
				//a temp image must be created to find the preferred size
				cb.autoSize=true;
				cb.setSize(170,90);
				java.awt.image.BufferedImage imageTemp = new java.awt.image.BufferedImage( cb.getSize().width,cb.getSize().height,java.awt.image.BufferedImage.TYPE_BYTE_INDEXED );
				java.awt.Graphics imgTempGraphics = imageTemp.createGraphics();
				cb.paint(imgTempGraphics);
				cb.invalidate();
				w=cb.getSize().width;
				h=cb.getSize().height;
				imgTempGraphics.dispose();
			}
			java.awt.image.BufferedImage BarImage=new java.awt.image.BufferedImage(w,h,java.awt.image.BufferedImage.TYPE_INT_RGB);
			java.awt.Graphics2D BarGraphics=BarImage.createGraphics();
			if (debug) System.out.println("Size: "+w+" "+h);
			cb.setSize(w,h);
			cb.paint(BarGraphics);
			if (encode.compareToIgnoreCase("gif")==0)
			{
				// encode buffered image to a gif
				GifEncoder encoder = new GifEncoder(BarImage  ,outb);
				encoder.encode();
			}
			else
			{
				// create JPEG image
				com.sun.image.codec.jpeg.JPEGImageEncoder encoder = com.sun.image.codec.jpeg.JPEGCodec.createJPEGEncoder(outb );
				//increase the JPEG quality to 100%
				com.sun.image.codec.jpeg.JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam( BarImage);
				param.setQuality(1.0F,true);
				encoder.setJPEGEncodeParam(param);
				encoder.encode( BarImage,param  );
			}
		} catch (Exception e) { e.printStackTrace();}
	}

	public void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException
	{
		try
		{
			doGet(request,response);
		}
			catch (Exception e) { e.printStackTrace();}
	}

}