JSF 下载文件 怎么实现

JSF 下载文件 怎么实现

 

 java code ::

----------------------------------

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 >

<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.download}" type="button"> 

</h:commandLink> 

</h:form>



</w:page>

</f:view>





}