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package org.primefaces.component.filedownload;

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import java.io.IOException;

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import javax.el.ELContext;

import javax.el.ValueExpression;

import javax.faces.component.StateHolder;

import javax.faces.context.FacesContext;

import javax.faces.event.AbortProcessingException;

import javax.faces.event.ActionEvent;

import javax.faces.event.ActionListener;

import javax.servlet.http.HttpServletResponse;

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import org.primefaces.model.StreamedContent;

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public class FileDownloadActionListener implements ActionListener, StateHolder {

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private ValueExpression value;

private ValueExpression contentDisposition;

public FileDownloadActionListener() {}

public FileDownloadActionListener(ValueExpression value, ValueExpression contentDisposition) {

this.value = value;

this.contentDisposition = contentDisposition;

}

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public void processAction(ActionEvent actionEvent) throws AbortProcessingException {

FacesContext facesContext = FacesContext.getCurrentInstance();

ELContext elContext = facesContext.getELContext();

HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse();

String contentDispositionValue = contentDisposition != null ? (String) contentDisposition.getValue(elContext) : "attachment";

StreamedContent content = (StreamedContent) value.getValue(elContext);

try {

? ?String fileName = java.net.URLEncoder.encode(content.getName(), "UTF-8");?

? ?response.setCharacterEncoding("UTF-8");

response.setContentType(content.getContentType());

response.setHeader("Content-Disposition", contentDispositionValue + ";filename=" + fileName);

byte[] buffer = new byte[2048];

int length;

while ((length = (content.getStream().read(buffer))) >= 0) {

response.getOutputStream().write(buffer, 0, length);

}

response.setStatus(200);

content.getStream().close();

response.getOutputStream().flush();

facesContext.responseComplete();

}catch (IOException e) {

e.printStackTrace();