ZXing生成条码二维码并输出到web页面的示例

1、生成条码的servlet代码:

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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

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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、web.xml中的配置

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< servlet >          < servlet-name >barCode</ servlet-name >          < servlet-class >com.XXX.XXX.common.servlet.BarCode1DServlet</ servlet-class >      </ servlet >      < servlet-mapping >          < servlet-name >barCode</ servlet-name >          < url-pattern >/barCode</ url-pattern >      </ servlet-mapping >      < servlet >          < servlet-name >qrCode</ servlet-name >          < servlet-class >com.XXX.XXX.common.servlet.BarCode2DServlet</ servlet-class >      </ servlet >      < servlet-mapping >          < servlet-name >qrCode</ servlet-name >          < url-pattern >/qrCode</ url-pattern >      </ servlet-mapping >

4、页面引用

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1 2	< 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 >