Servlet中用ZXing生成条码二维码并输出到web页面

               

1、生成条码的servlet代码:

import java.io.IOException; import javax.servlet.ServletException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse; import com.google.zxing.BarcodeFormat;import com.google.zxing.WriterException;import com.google.zxing.client.j2se.MatrixToImageWriter;import com.google.zxing.common.BitMatrix;import com.google.zxing.oned.Code128Writer; /** * @Description: 生成条码（CODE128格式）  */public class BarCode1DServlet extends HttpServlet {     /**       * @Fields serialVersionUID : default serialVersionUID     */    private static final long serialVersionUID = 1L;         private static final String KEY = "keycode";    private static final String WIDTH = "mwidth";    private static final String HEIGHT = "mheight";    private static final String IMAGETYPE = "JPEG";     @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp)            throws ServletException, IOException {        String keycode = req.getParameter(KEY);        if (keycode != null && !"".equals(keycode)) {            ServletOutputStream stream = null;            try {                Code128Writer writer = new Code128Writer();                int width=180;                int height=60;                String mwidth = req.getParameter(WIDTH);                if (mwidth != null && !"".equals(mwidth.trim())) {                    try{                        width=Integer.valueOf(mwidth);                    } catch (NumberFormatException e) {                                        //TODO output to log                    }                }                String mheight = req.getParameter(HEIGHT);                if (mheight != null && !"".equals(mheight.trim())) {                    try{                        height = Integer.valueOf(mheight);                    } catch (NumberFormatException e) {                        //TODO output to log                    }                }                stream = resp.getOutputStream();                BitMatrix m = writer.encode(keycode, BarcodeFormat.CODE_128, width, height);                MatrixToImageWriter.writeToStream(m, IMAGETYPE, stream);            } catch (WriterException e) {                e.printStackTrace();            } finally {                if (stream != null) {                    stream.flush();                    stream.close();                }            }        }    }     @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp)            throws ServletException, IOException {        this.doGet(req, resp);    }           }

2、生成qrcode二维码的servlet示例

import java.io.IOException; import javax.servlet.ServletException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse; import com.google.zxing.BarcodeFormat;import com.google.zxing.WriterException;import com.google.zxing.client.j2se.MatrixToImageWriter;import com.google.zxing.common.BitMatrix;import com.google.zxing.qrcode.QRCodeWriter; /** * @Description: 生成二维码 （QR格式） * @author lwei */public class BarCode2DServlet extends HttpServlet {     /**       * @Fields serialVersionUID : serialVersionUID     */         private static final long serialVersionUID = 1L;         private static final String KEY = "keycode";    private static final String SIZE = "msize";    private static final String IMAGETYPE = "JPEG";     @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp)            throws ServletException, IOException {        String keycode = req.getParameter(KEY);                 if (keycode != null && !"".equals(keycode)) {            ServletOutputStream stream = null;            try {                int size=129;                String msize = req.getParameter(SIZE);                if (msize != null && !"".equals(msize.trim())) {                    try{                        size=Integer.valueOf(msize);                    } catch (NumberFormatException e) {                        //TODO output to log                    }                }                stream = resp.getOutputStream();                QRCodeWriter writer = new QRCodeWriter();                BitMatrix m = writer.encode(keycode, BarcodeFormat.QR_CODE, size, size);                MatrixToImageWriter.writeToStream(m, IMAGETYPE, stream);            } catch (WriterException e) {                e.printStackTrace();            } finally {                if (stream != null) {                    stream.flush();                    stream.close();                }            }        }    }     @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp)            throws ServletException, IOException {        this.doGet(req, resp);    }     }

3、页面引用

<img alt="条码" src="${pageContext.request.contextPath}/barCode?keycode=RT100200300400"></img><img alt="二维码" src="${pageContext.request.contextPath}/qrCode?keycode=RT100200300400500"></img>

转自网络，原作者已佚

           

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