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Java生成2维码源码

2015-09-17 15:58 323 查看

参考http://blog.csdn.net/lmb55/article/details/46039445此博客

@WebServlet(“/PrintTwoBarCode”)//对servlet加注解，可以不用在xml配置servlet

public class PrintTwoBarCode extends HttpServlet {

private static final long serialVersionUID = 1L;

[code]/**
 * @see HttpServlet#HttpServlet()
 */
public PrintTwoBarCode() {
    super();
    // TODO Auto-generated constructor stub
}

/**
 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 */
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    doPost(request, response);
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    String code = request.getParameter("code");//获取二维码封装的信息

    Qrcode testQrcode = new Qrcode();
    testQrcode.setQrcodeErrorCorrect('M');
    testQrcode.setQrcodeEncodeMode('B');
    testQrcode.setQrcodeVersion(7);
    byte[] d = code.getBytes("gbk");
    BufferedImage image = new BufferedImage(98, 98,
            BufferedImage.TYPE_BYTE_BINARY);
    Graphics2D g = image.createGraphics();
    g.setBackground(Color.WHITE);
    g.clearRect(0, 0, 98, 98);
    g.setColor(Color.BLACK);
    if (d.length > 0 && d.length < 120) {
        boolean[][] s = testQrcode.calQrcode(d); //通过calQrcode函数将byte数组转换成boolean数组 ,然后依据编码后的boolean数组绘图 
        for (int i = 0; i < s.length; i++) {
            for (int j = 0; j < s.length; j++) {
                if (s[j][i]) {
                    g.fillRect(j * 2 + 3, i * 2 + 3, 2, 2);
                }
            }
        }
    }
    g.dispose();
    image.flush();
    ImageIO.write(image, "jpg", response.getOutputStream());//把二维码图片写入输出流中
}

}

jsp文件如下

[code]<body>
    <div class="box">
        <h2>扫一扫开启爱的密码</h2>
        <img src="PrintTwoBarCode?code=http://blog.csdn.net/lmb55">
    </div>
  </body>

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