package demo;


import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.logging.Logger;

import javax.faces.application.Application;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import org.operamasks.faces.annotation.ManagedBean;
import org.operamasks.faces.annotation.ManagedBeanScope;
@ManagedBean(name="downFile", scope=ManagedBeanScope.SESSION)
public class DownFile {    
    public String download() {
          //OaMailAttach oaMailAttach = getOaMailAttach();

        String path="G:\\sun\\";
        String fileName="20074111452140.doc";
            
          try {
           FacesContext ctx = FacesContext.getCurrentInstance();
           ctx.responseComplete();
           //String contentType = "application/octet-stream;charset=utf-8";
           String contentType = "application/x-download";
           HttpServletResponse response = (HttpServletResponse) ctx.getExternalContext().getResponse();
           
          
           
           response.setContentType(contentType);

           StringBuffer contentDisposition = new StringBuffer();

           contentDisposition.append("attachment;");

           contentDisposition.append("filename=\"");
           contentDisposition.append(fileName);
           contentDisposition.append("\"");
           //log.debug(System.getProperty("file.encoding"));
           response.setHeader("Content-Disposition", new String(contentDisposition.toString().getBytes(System.getProperty("file.encoding")),"iso8859_1"));
          // log.debug(contentDisposition.toString());
           ServletOutputStream out = response.getOutputStream();

           //log.debug(new Long(oaMailAttach.getAtFile().length()));

           byte[] bytes = new byte[0xffff];
           InputStream is = new FileInputStream(new File(path + fileName));
           int b = 0;
           while ((b = is.read(bytes, 0, 0xffff)) > 0) {
            out.write(bytes, 0, b);
           }
           is.close();
           out.flush();
           ctx.responseComplete();
          } catch (Exception e) {
           // TODO 自动生成 catch 块
           e.printStackTrace();
          }
          return null;
         }


}

<%@ page contentType="text/html;charset=UTF-8"%>
<%@ taglib prefix="f" uri="http://java.sun.com/jsf/core" %>
<%@ taglib prefix="h" uri="http://java.sun.com/jsf/html" %>
<%@ taglib prefix="l" uri="http://www.apusic.com/jsf/layout" %>
<%@ taglib prefix="ajax" uri="http://www.apusic.com/jsf/ajax" %>
<%@ taglib prefix="w" uri="http://www.apusic.com/jsf/widget" %>
<f:view renderKitId="AJAX">
<w:page title="Stock Quote" skin="aqua">
<h:head>
<style type="text/css">
#grid-example {
  height:280px;
  border:1px solid #cbc7b8;
}
#stock-detail {
  width:400px;
}
</style>
<w:stylesheet src="/common/resources/examples.css"/>
</h:head>
<h:form>
<h:commandLink id="file1" value="下载文件" action="#{downFile.downfile1}" type="button"> 
</h:commandLink> 
</h:form>
 
</w:page>
</f:view>