Facelet Title

# Scanner un codigo QR con primefaces **Proyecto:** Usaremos el componente \ para obtener una foto Usamos Firefox, Google Chrome no permite si no es un sitio https ![](/files/-Lc1X5ig72ODqlF_gx4_) Dar clic en Capture QR para capturar la imagen ![](/files/-Lc1X5iiN7ebGUzNfyqF) si logra detectrarlo ![](/files/-Lc1X5ik6Nfymj2Mlpuz) ## Dependencias ``` com.github.avbravo avbravoutils 0.27.1 jitpack.io https://jitpack.io ``` ## pagina .xhtml ```java Facelet Title ``` ## Controller ```java /* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package com.avbravo.foto; import com.avbravo.avbravoutils.JsfUtil; import com.avbravo.avbravoutils.QR; import java.io.File; import java.io.IOException; import java.io.Serializable; import javax.inject.Named; import javax.faces.FacesException; import javax.faces.context.ExternalContext; import javax.faces.context.FacesContext; import javax.faces.view.ViewScoped; import javax.imageio.stream.FileImageOutputStream; import org.primefaces.event.CaptureEvent; /** * * @author avbravo */ @Named @ViewScoped public class WebQR implements Serializable { private String filename; public String getFilename() { return filename; } public void oncapture(CaptureEvent captureEvent) { filename = ""; byte[] data = captureEvent.getData(); ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext(); // String newFileName = externalContext.getRealPath("") + File.separator + "resources" + File.separator + "demo" + // File.separator + "images" + File.separator + "photocam" + File.separator + filename + ".jpeg"; String name = JsfUtil.getUUIDMinusculas(); String newFileName = "/home/avbravo/Descargas/" + name + ".png"; this.filename=newFileName; FileImageOutputStream imageOutput; try { imageOutput = new FileImageOutputStream(new File(newFileName)); imageOutput.write(data, 0, data.length); imageOutput.close(); JsfUtil.successMessage("Imagen guardada " + name + ".png"); scanQR(this.filename); } catch (IOException e) { throw new FacesException("Error in writing captured image.", e); // JsfUtil.errorMessage("Error() "+e.getLocalizedMessage()); } } public String scanQR(String name) { try { File file = new File(name); String decodedText = QR.decodificarQRCode(name, false); if (decodedText == null) { JsfUtil.errorDialog("Error", "No QR Code found in the imageÑ"); //System.out.println("No QR Code found in the image"); } else { JsfUtil.successMessage("Decoded text = " + decodedText); // System.out.println("Decoded text = " + decodedText); } } catch (Exception e) { JsfUtil.errorMessage("Could not decode QR Code, IOException " + e.getLocalizedMessage()); System.out.println("Could not decode QR Code, IOException :: " + e.getMessage()); } return ""; } } ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://avbravo-2.gitbook.io/trucosjakartaee/overview/java-server-faces/chapter1/scanner-un-codigo-qr-con-primefaces.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.