GAE/JアプリでPDF出力(3) 〜バーコードをPDF出力〜

GAE/JアプリでPDF形式でバーコードを出力する。
今の所対応するコードはEAN(JAN), CODE39, CODE128。但しCODE128の制御文字は扱えない。
　
　↓↓GAE上で暫定公開中↓↓
http://t2-pdf.appspot.com/
　

フレームワーク/ライブラリは T2Framework と iText を使用。
昨日の記事で取り上げたRhinoは最初使っていたが、コードの量を減らすために最終的には使わないことにした。

以下、ソース。　

T2のNavigator。Directクラスを継承。contenttypeを指定できるようにしてある。

package examples.navigation;
import java.io.File;

import java.io.InputStream;

import javax.servlet.http.HttpServletResponse;
import org.t2framework.commons.util.Assertion;

import org.t2framework.t2.contexts.WebContext;

import org.t2framework.t2.navigation.Direct;
public class CustomDirect extends Direct{

    protected String contextType;

    

    public CustomDirect(byte[] bytes) {

        super(bytes);

    }
    public CustomDirect(File file) {

        super(file);

    }
    public CustomDirect(InputStream is) {

        super(is);

    }

    

    protected CustomDirect setContextType(String contextType){

        this.contextType = contextType;

        return this;

    }

    

    public static CustomDirect from(File file, String contextType) {

        return new CustomDirect(Assertion.notNull(file)).setContextType(contextType);

    } 

    

    public static CustomDirect from(byte[] bytes, String contextType){

        return new CustomDirect(Assertion.notNull(bytes)).setContextType(contextType);

    }

    

    public static CustomDirect from(InputStream is, String contextType){

        return new CustomDirect(Assertion.notNull(is)).setContextType(contextType);

    }

        

    @Override

    public void execute(WebContext context) throws Exception {

        final HttpServletResponse response =

            context.getResponse().getNativeResource();

        response.setContentType(contextType);

        super.writeTo(response, response.getOutputStream());

    }

}

　

T2のPageクラス

package examples.page;
import java.io.ByteArrayOutputStream;
import org.t2framework.commons.util.Logger;

import org.t2framework.t2.annotation.composite.GET;

import org.t2framework.t2.annotation.core.Default;

import org.t2framework.t2.annotation.core.Page;

import org.t2framework.t2.annotation.core.RequestParam;

import org.t2framework.t2.spi.Navigation;
import com.lowagie.text.Document;

import com.lowagie.text.Font;

import com.lowagie.text.PageSize;

import com.lowagie.text.Paragraph;

import com.lowagie.text.pdf.BaseFont;

import com.lowagie.text.pdf.PdfWriter;
import examples.navigation.CustomDirect;

import examples.util.Barcodeutil;
@Page("/barcode")

public class BarcodePage {

    @SuppressWarnings("unused")

    private static Logger logger = Logger.getLogger(BarcodePage.class);
  @SuppressWarnings("unchecked")

    @GET

    @Default

    public Navigation barcode(@RequestParam("caption") String caption,

            @RequestParam("codetype") String codetype, @RequestParam("addcd") String addcd,

            @RequestParam("code") String code) throws Exception {
   if (caption != null)

    caption = caption.replace("&", "&");

   code = code.replace("&", "&");

        final boolean isAddCD = Boolean.parseBoolean(addcd);

        System.out.println(code);

        //ID2 = A7 Rotated  

        Document doc = new Document(PageSize.ID_3, 10, 10, 10, 10); 

        ByteArrayOutputStream byteout = new ByteArrayOutputStream();

        PdfWriter writer = PdfWriter.getInstance(doc, byteout);

        doc.open();

        

        // Add Caption

        BaseFont basefont = BaseFont.createFont("HeiseiKakuGo-W5", 

                "UniJIS-UCS2-H", false);

        doc.add(new Paragraph(caption, new Font(basefont, 12))); 
        // Add Barcode Image

        Class clazz = Class.forName("com.lowagie.text.pdf." + codetype); 

        doc.add(Barcodeutil.getInstance().getImage(clazz, code, isAddCD, writer));
        doc.close();        

        

        return CustomDirect.from(byteout.toByteArray(), "application/pdf");

    }

}

　

バーコードを取り扱うためのSingletonクラス

package examples.util;
import com.lowagie.text.Image;

import com.lowagie.text.pdf.Barcode;

import com.lowagie.text.pdf.PdfWriter;
public class Barcodeutil{

    private static Barcodeutil instance = new Barcodeutil();

    private Barcodeutil() {}

    

    public static Barcodeutil getInstance() {

          return instance;

    }
    public <T extends Barcode> Image getImage(Class<T> type,

            String code, boolean isGenerateCheckSum, PdfWriter writer) 

            throws Exception{ 

        T barcode = type.newInstance();

        barcode.setGenerateChecksum(isGenerateCheckSum);

        barcode.setCode(code);

        

        if (type == com.lowagie.text.pdf.BarcodeEAN.class) {

            switch (code.length()) {

            case 13:

                barcode.setCodeType(Barcode.EAN13);            

                break;

            case 8:

                barcode.setCodeType(Barcode.EAN8);        

                break;

            }   

        }

        

        return barcode.createImageWithBarcode(writer.getDirectContent(),

                null, null);

    }

}

　

コードチェック用JavaScript

var code39chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%";

var code128chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvexyz"

 + " !?#$%&'()*+,-./:;<=>?@[\]^_`{|}~"
function getCode39Checkdigit(arg){

    var sum = 0;

    for(i = 0; i < arg.length; i++){

        var num = code39chars.indexOf(arg.charAt(i));

        if (num < 0)

            return null;

        sum += num;

    }

    return code39chars.charAt(sum % 43);

}
function isValidCode39Code(arg){

    return (getCode39Checkdigit(arg) != null);

}
function isValidCode128Code(arg){

    for(i = 0; i < arg.length; i++)

        if (code128chars.indexOf(arg.charAt(i)) < 0)

            return false;
    return true;

}

　　

入力画面のJSP（といってもほぼ素のHTML+JavaScript）

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />

<meta http-equiv="Content-Style-Type" content="text/css" />

<meta http-equiv="Content-Script-Type" content="text/JavaScript" />

<title>T2 PDF</title>

<script type="text/javascript" src="js/barcodeutil.js"></script>

<script type="text/javascript">

<!--

var ErrIllegalChar = "Contains illegal character(s)";

var ErrIllegalLength = "EAN code length must be 8 or 13";
function onCodeTypeComboChange(){

    document.getElementById("digitcheckbox").disabled =

        (document.getElementById("CodeTypeCombo").value != "Barcode39");

}
function onSendButtonClick(){

  var code = document.getElementById("CodeEdit").value;

  if (code == "")

    return;

  

  var caption = document.getElementById("TitleEdit").value;

  var codetype = document.getElementById("CodeTypeCombo").value;
  if (codetype == "BarcodeEAN"){

    if (code.match(new RegExp("[^0-9]"))){

      alert(ErrIllegalChar);

      return;

    }

    if ((code.length != 8)&&(code.length != 13)){

        alert(ErrIllegalLength);

        return;

    }

  } else if (codetype == "Barcode39"){

    code = code.toUpperCase();

    if (!isValidCode39Code(code)){

      alert(ErrIllegalChar);

      return;

    }

  } else {

    if (!isValidCode128Code(code)){

      alert(ErrIllegalChar);

      return; 

    }

  }

  

  var targeturl = "/barcode";

  var param = "?caption=" + encodeURIComponent(caption)

            + "&codetype=" + codetype

            + "&code=" + encodeURIComponent(code)

            + "&addcd=" + document.getElementById("digitcheckbox").checked;
  window.open(targeturl + param, "_blank");

}

// -->

</script>
</head>

<body>

<p>Barcode Generator</p>

<form name="Form1" method="GET" action="">

<table>

<tr>

  <td>Caption:</td>

  <td>

  <input type="text" id="TitleEdit" maxlength="30" />

  </td>

</tr>

<tr>

  <td>Codetype:</td>

  <td>

  <select id="CodeTypeCombo" onChange="onCodeTypeComboChange()">

    <option value="BarcodeEAN" SELECTED>EAN</option>

    <option value="Barcode39">CODE39</option>

    <option value="Barcode128">CODE128</option>

  </select>

  </td>

</tr>

<tr>

  <td>CheckDigit:</td>

  <td>

  <input TYPE="checkbox" id="digitcheckbox" value="true" disabled="true"/>AddCheckDigit

  </td>

</tr>

<tr>

  <td>Code:</td>

  <td>

  <input TYPE="text" id="CodeEdit" style="ime-mode:inactive" maxlength="30" />

  </td>

</tr>

<tr>

  <td></td>

  <td>

  <input type="button" name="SendButton" value="Generate Barcode" onClick="onSendButtonClick()">

  </td>

</tr>

</table>

</form>

<p>Notes: This Application can't deal with Code128 control characters.</p>

</body>

</html>

　
　
これからやる（やりたい）こと：
　・cssでデザインを整える
　・JavaDoc書く
　・SDLoaderで単体起動できるようにする
　・Antの使い方を覚える
　
多分やらないこと
　・JavaScriptでTextInputのonKeyEnter()で入力制限
　　→ブラウザ毎に動きが違うから面倒