idautomationsecureservlet.java

著名IDAutomation公司的JAVA条码控件源码

//*****************************************************************
 //
 //  JAVA Source for com.idautomation.linear; 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.linear;

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 IDAutomationSecureServlet
    extends HttpServlet {

  /**
   * Handle the HTTP POST method by sending an e-mail
   *
   *
   */
  private boolean debug = false;

  public void init() throws ServletException {

  }

  // MODIFY THIS METHOD TO RETRIEVE DATA TO ENCODE, CREATE THE BARCODE AND SET THE PARAMETERS
  private BarCode getChart(HttpServletRequest request) {
    BarCode cb = new BarCode();

    cb.code = "SecureServlet";

    return cb;
  }

  // Handle the request
  // 1. create barcode
  // 2. draw barcode 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 {
    ServletOutputStream outb;
    //default encoding type
    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 {
      // find sizes
      int w = 10;
      int h = 10;
      // get the BarCode
      BarCode 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
        cb.setSize(w, h);
        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();
    }
  }

}