Java 生成 / 解码 QR码

彭博 发布于 2012/07/31 16:50
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QR码的使用越来越多,可以在很多地方见着,比如火车票、推广产品上等,以下将介绍如何用Java生成QR码以及解码QR码。

1、涉及开源项目

ZXing :一个开源Java类库用于解析多种格式的1D/2D条形码。目标是能够对QR编码、Data Matrix、UPC的1D条形码进行解码。 其提供了多种平台下的客户端包括:J2ME、J2SE和Android。---用来解码QRcode

d-project:Kazuhiko Arase的个人项目(他具体是谁不清楚,日本的),提供丰富的配置参数,非常灵活---用来生成QR code

2、效果图:

生成QR code


解码QR code

3、使用d-project生成QRcdoe

    1)将com.d_project.qrcode.jar引入工程

    2)QRcodeAction代码:

	public void generate(RequestContext rc)
			throws UnsupportedEncodingException, IOException, ServletException {
                //待转数据
		String data = rc.param("data", "http://osctools.net/qr");
                //输出图片类型
                String output = rc.param("output", "image/jpeg");

		int type = rc.param("type", 4);
		if (type < 0 || 10 < type) {
			return;
		}

		int margin = rc.param("margin", 10);
		if (margin < 0 || 32 < margin) {
			return;
		}

		int cellSize = rc.param("size", 4);
		if (cellSize < 1 || 4 < cellSize) {
			return;
		}

		int errorCorrectLevel = 0;

		try {
			errorCorrectLevel = parseErrorCorrectLevel(rc,
					rc.param("error", "H"));
		} catch (Exception e) {
			return;
		}

		com.d_project.qrcode.QRCode qrcode = null;
		try {
			qrcode = getQRCode(data, type, errorCorrectLevel);
		} catch (Exception e) {
			return;
		}

		if ("image/jpeg".equals(output)) {

			BufferedImage image = qrcode.createImage(cellSize, margin);

			rc.response().setContentType("image/jpeg");

			OutputStream out = new BufferedOutputStream(rc.response()
					.getOutputStream());

			try {
				ImageIO.write(image, "jpeg", out);
			} finally {
				out.close();
			}

		} else if ("image/png".equals(output)) {

			BufferedImage image = qrcode.createImage(cellSize, margin);

			rc.response().setContentType("image/png");

			OutputStream out = new BufferedOutputStream(rc.response()
					.getOutputStream());

			try {
				ImageIO.write(image, "png", out);
			} finally {
				out.close();
			}

		} else if ("image/gif".equals(output)) {

			GIFImage image = createGIFImage(qrcode, cellSize, margin);

			rc.response().setContentType("image/gif");

			OutputStream out = new BufferedOutputStream(rc.response()
					.getOutputStream());

			try {
				image.write(out);
			} finally {
				out.close();
			}

		} else {
			return;
		}

	}

	private static int parseErrorCorrectLevel(RequestContext rc, String ecl) {
		if ("L".equals(ecl)) {
			return ErrorCorrectLevel.L;
		} else if ("Q".equals(ecl)) {
			return ErrorCorrectLevel.Q;
		} else if ("M".equals(ecl)) {
			return ErrorCorrectLevel.M;
		} else if ("H".equals(ecl)) {
			return ErrorCorrectLevel.H;
		} else {
			throw rc.error("qr_error_correct_error");
		}

	}


	private static QRCode getQRCode(String text, int typeNumber,
			int errorCorrectLevel) throws IllegalArgumentException {
		if (typeNumber == 0) {
			return QRCode.getMinimumQRCode(text, errorCorrectLevel);
		} else {
			QRCode qr = new QRCode();
			qr.setTypeNumber(typeNumber);
			qr.setErrorCorrectLevel(errorCorrectLevel);
			qr.addData(text);
			qr.make();
			return qr;
		}
	}

	private static GIFImage createGIFImage(QRCode qrcode, int cellSize,
			int margin) throws IOException {

		int imageSize = qrcode.getModuleCount() * cellSize + margin * 2;

		GIFImage image = new GIFImage(imageSize, imageSize);

		for (int y = 0; y < imageSize; y++) {

			for (int x = 0; x < imageSize; x++) {

				if (margin <= x && x < imageSize - margin && margin <= y
						&& y < imageSize - margin) {

					int col = (x - margin) / cellSize;
					int row = (y - margin) / cellSize;

					if (qrcode.isDark(row, col)) {
						image.setPixel(x, y, 0);
					} else {
						image.setPixel(x, y, 1);
					}

				} else {
					image.setPixel(x, y, 1);
				}
			}
		}

		return image;
	}
  

    3)前端页面:

<script type="text/javascript" src="/js/jquery/jquery.form-2.82.js"></script>

<script type="text/javascript">

	$(document).ready(function(){

				$("#submit").click(function(){

			var url = "/action/qrcode/generate?" + $("#qrcode_form").serialize();

			$(".QRCodeDiv img").attr("src",url+"&"+new Date().getTime());

			$("#gen_url").attr("href",url);

		});

		    	$("#zxing").popover({

    		'title':'条形码处理类库 ZXing',

    		'content':'ZXing是一个开源Java类库用于解析多种格式的1D/2D条形码。目标是能够对QR编码、Data Matrix、UPC的1D条形码进行解码。 其提供了多种平台下的客户端包括:J2ME、J2SE和Android。',

			'placement':'bottom'

    	});

	});

</script>

<div id="mainContent" class="wrapper">

<div class="toolName">在线生成二维码(QR码)-采用<a id="zxing" href="http://www.oschina.net/p/zxing">ZXing</a>与<a href="http://www.d-project.com/">d-project</a><a data-toggle="modal" href="#advice" style="float:right;text-decoration:none;"><span class="badge badge-important"><i class="icon-envelope icon-white"></i> Feedback</span></a></div>

<div class="toolUsing clearfix">

	<div class="toolsTab  clearfix">

	    <ul class="nav nav-tabs">

            <li class="active"><a href="/qr">转QR码</a></li>

            <li ><a href="/qr?type=2">二维码解码</a></li>

	    </ul>

	    <div class="clear"></div>

	</div>

	<form id="qrcode_form" method="post" >

	    	<div class="leftBar">

			<div class="title">URL或其他文本:</div>

			<textarea class="input-xlarge" name="data" onfocus="if(this.value=='http://osctools.net/qr'){this.value='';};this.select();" onblur="(this.value=='')?this.value='http://osctools.net/qr':this.value;">http://osctools.net/qr</textarea>

    	</div>

    	<div class="operateLR">

            <div class="OptDetail span1">

            	<label>输出格式:</label>

                <select name="output" class="span1">

                    <option value="image/gif" selected>GIF</option>

                    <option value="image/jpeg">JPEG</option>

                    <option value="image/png">PNG</option>

                </select>

                <label>纠错级别:</label>

                <select name="error" class="span1">

                    <option value="L" selected>L 7%</option>

                    <option value="M">M 15%</option>

                    <option value="Q">Q 25%</option>

                    <option value="H">H 30%</option>

                </select>

                <label>类型:</label>

        		<select name="type" class="span1">

                    <option value="0">自动</option>

                                        <option value="1">1</option>

                                        <option value="2">2</option>

                                        <option value="3">3</option>

                                        <option value="4">4</option>

                                        <option value="5">5</option>

                                        <option value="6">6</option>

                                        <option value="7">7</option>

                                        <option value="8">8</option>

                                        <option value="9">9</option>

                                        <option value="10">10</option>

                                    </select>

                <label>边缘留白:</label>

    			<select name="margin" class="span1">

                                        <option value="0">0</option>

                                        <option value="1">1</option>

                                        <option value="2">2</option>

                                        <option value="3">3</option>

                                        <option value="4">4</option>

                                        <option value="5">5</option>

                                        <option value="6">6</option>

                                        <option value="7">7</option>

                                        <option value="8">8</option>

                                        <option value="9">9</option>

                                        <option value="10">10</option>

                                        <option value="11">11</option>

                                        <option value="12">12</option>

                                        <option value="13">13</option>

                                        <option value="14">14</option>

                                        <option value="15">15</option>

                                        <option value="16">16</option>

                                        <option value="17">17</option>

                                        <option value="18">18</option>

                                        <option value="19">19</option>

                                        <option value="20">20</option>

                                        <option value="21">21</option>

                                        <option value="22">22</option>

                                        <option value="23">23</option>

                                        <option value="24">24</option>

                                        <option value="25">25</option>

                                        <option value="26">26</option>

                                        <option value="27">27</option>

                                        <option value="28">28</option>

                                        <option value="29">29</option>

                                        <option value="30">30</option>

                                        <option value="31">31</option>

                                        <option value="32">32</option>

                                    </select>

                <label>原胞大小:</label>

    			<select name="size" class="span1">

                                        <option value="1"  >1</option>

                                        <option value="2"  >2</option>

                                        <option value="3"  >3</option>

                                        <option value="4" selected >4</option>

                        			</select>

				<button class="btn btn-small btn-primary" id="submit" onclick="return false;">生成QR码</button>            </div>

    	</div>

    	<div class="rightBar">

						<div class="title">QR码:</div>

            <div class="QRCodeDiv">

				<div class="QRWrapper">

					<a id="gen_url" href="/action/qrcode/generate?size=4" target="_blank"><img src="/action/qrcode/generate?size=4"/></a>

				</div>

			</div>

    	</div>

	    </form>

</div>

</div>

4、使用ZXing解码QRcode

    1)下载Zxing-2.0.zip

    2)引入zxing-barcode_core.jar与zxing_barcode_j2se.jar到工程

    3)QRcodeAction代码:

	@PostMethod
	@JSONOutputEnabled
	public void decode(RequestContext rc) throws IOException {
		//存在qrcode的网址
                String url = rc.param("url", "");
                //待解码的qrcdoe图像
                File img = rc.file("qrcode");
		if (StringUtils.isBlank(url) && img == null) {
			throw rc.error("qr_upload_or_url_null");
		}

		List<Result> results = new ArrayList<Result>();
		Config config = new Config();
		Inputs inputs = new Inputs();

		config.setHints(buildHints(config));

		if (StringUtils.isNotBlank(url)) {
			addArgumentToInputs(url, config, inputs);
		}
		if (img != null) {
			inputs.addInput(img.getCanonicalPath());
		}
		while (true) {
			String input = inputs.getNextInput();
			if (input == null) {
				break;
			}
			File inputFile = new File(input);
			if (inputFile.exists()) {
				try {
					Result result = decode(inputFile.toURI(), config,rc);
					results.add(result);
				} catch (IOException e) {
				}
			} else {
				try {
					Result result = decode(new URI(input), config,rc);
					results.add(result);
				} catch (Exception e) {
				}
			}
		}
		rc.print(new Gson().toJson(results));
	}

	private Result decode(URI uri,Config config,RequestContext rc)
			throws IOException {
		Map<DecodeHintType, ?> hints = config.getHints();
		BufferedImage image;
		try {
			image = ImageIO.read(uri.toURL());
		} catch (IllegalArgumentException iae) {
			throw rc.error("qr_resource_not_found");
		}
		if (image == null) {
			throw rc.error("qr_could_not_load_image");
		}
		try {
			LuminanceSource source = new BufferedImageLuminanceSource(image);
			BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
			Result result = new MultiFormatReader().decode(bitmap, hints);
			return result;
		} catch (NotFoundException nfe) {
			throw rc.error("qr_no_barcode_found");
		}
	}

	private static Map<DecodeHintType, ?> buildHints(Config config) {
		Map<DecodeHintType, Object> hints = new EnumMap<DecodeHintType, Object>(
				DecodeHintType.class);
		Collection<BarcodeFormat> vector = new ArrayList<BarcodeFormat>(8);
		vector.add(BarcodeFormat.UPC_A);
		vector.add(BarcodeFormat.UPC_E);
		vector.add(BarcodeFormat.EAN_13);
		vector.add(BarcodeFormat.EAN_8);
		vector.add(BarcodeFormat.RSS_14);
		vector.add(BarcodeFormat.RSS_EXPANDED);
		if (!config.isProductsOnly()) {
			vector.add(BarcodeFormat.CODE_39);
			vector.add(BarcodeFormat.CODE_93);
			vector.add(BarcodeFormat.CODE_128);
			vector.add(BarcodeFormat.ITF);
			vector.add(BarcodeFormat.QR_CODE);
			vector.add(BarcodeFormat.DATA_MATRIX);
			vector.add(BarcodeFormat.AZTEC);
			vector.add(BarcodeFormat.PDF_417);
			vector.add(BarcodeFormat.CODABAR);
			vector.add(BarcodeFormat.MAXICODE);
		}
		hints.put(DecodeHintType.POSSIBLE_FORMATS, vector);
		if (config.isTryHarder()) {
			hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
		}
		if (config.isPureBarcode()) {
			hints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
		}
		return hints;
	}

	private static void addArgumentToInputs(String argument, Config config,
			Inputs inputs) throws IOException {
		File inputFile = new File(argument);
		if (inputFile.exists()) {
			inputs.addInput(inputFile.getCanonicalPath());
		} else {
			inputs.addInput(argument);
		}
	}

     4)前端页面:

<script type="text/javascript" src="/js/jquery/jquery.form-2.82.js"></script>

<script type="text/javascript">

	$(document).ready(function(){

				$("#qrcode_form").ajaxForm({

			success:function(json){

				if(json==null)

					return;

				json = eval("("+json+")");

				if(json.msg){

					alert(json.msg);

					return;

				}

				if(json[0])

					$("#result").val(json[0].text);

				else

					$("#result").val("解码失败");

			}

		});

		    	$("#zxing").popover({

    		'title':'条形码处理类库 ZXing',

    		'content':'ZXing是一个开源Java类库用于解析多种格式的1D/2D条形码。目标是能够对QR编码、Data Matrix、UPC的1D条形码进行解码。 其提供了多种平台下的客户端包括:J2ME、J2SE和Android。',

			'placement':'bottom'

    	});

	});

</script>

<div id="mainContent" class="wrapper">

<div class="toolName">在线生成二维码(QR码)-采用<a id="zxing" href="http://www.oschina.net/p/zxing">ZXing</a>与<a href="http://www.d-project.com/">d-project</a><a data-toggle="modal" href="#advice" style="float:right;text-decoration:none;"><span class="badge badge-important"><i class="icon-envelope icon-white"></i> Feedback</span></a></div>

<div class="toolUsing clearfix">

	<div class="toolsTab  clearfix">

	    <ul class="nav nav-tabs">

            <li ><a href="/qr">转QR码</a></li>

            <li class="active"><a href="/qr?type=2">二维码解码</a></li>

	    </ul>

	    <div class="clear"></div>

	</div>

	<form id="qrcode_form" method="post" action="/action/qrcode/decode">

	    	<div class="topBar">

            <div class="title">

				<label class="radio" for="upload_url">图片URL:

					<input checked="checked" name="upload_ctn" id="upload_url" style="margin-right:5px;" type="radio" onchange="if(this.checked){$('input[name=\'url\']').removeAttr('disabled');$('input[name=\'qrcode\']').attr('disabled','disabled')}"/>

				</label>

			</div>

			<input name="url" id="url" style="width:100%;height:40px;margin:0 0 10px 0;" onfocus="if(this.value=='http://www.osctools.net/img/qr.gif'){this.value='';};this.select();" onblur="(this.value=='')?this.value='http://www.osctools.net/img/qr.gif':this.value;" value="http://www.osctools.net/img/qr.gif"/>

            <div class="title">

				<label  class="radio" for="upload_img">上传图片:

					<input style="margin-right:5px;" name="upload_ctn" id="upload_img" type="radio" onchange="if(this.checked){$('input[name=\'qrcode\']').removeAttr('disabled');$('input[name=\'url\']').attr('disabled','disabled')}"/>

				</label>

			</div>

			<input disabled="disabled" name="qrcode" type="file" class="input-file"/>

    		<input class="btn btn-primary" value="解码" type="submit"/>

    	</div>

		<div class="bottomBar">

			<div class="title">解码结果:</div>

			<textarea id="result"></textarea>

        </div>

	    </form>

</div>
</div>

注意:其中牵涉到的RequestContext类见此处:http://www.oschina.net/code/snippet_12_2

 

加载中
0
Honghe
Honghe
不错 z_xing 更新了
0
don43
don43

请问为什么我生成的二维码,中文有部分是问号,无法识别?

我的代码与你的代码基本都雷同,而且我发现jar里面自带的demo也会有我那样的问题,

但是你的在线生成的网站却不会,这是什么原因呢?

0
don43
don43
求助~~~~~~
0
s
shuanys

楼主,请问d-project,如何设置生成的二维码宽高呢?谢谢

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