struts2文件下载(解决中文文件名问题)

1.首先,jsp页面进行下载的那段话需要使用<s:url>标签:

<a href="<s:url value='filedownload.action'>                 
                    <s:param name='fileName' >无线网络.ppt</s:param>
            </s:url>">
            下载文件
    </a>

2.struts2.xml文件中的配置:

<action name="filedownload" class="Action.FileUploadAction" method="downloadfile">
            <param name="fileName"></param>  
            <result name="success" type="stream">
               <param name="contentType">application/vnd.ms-powerpoint</param>
               <param name="contentDisposition">
                    attachment;filename="${dnfileName}" 
                </param> 
               <param name="inputName">downloadFile</param>
            </result>

        </action>

这里解释一下:fileName是前台jsp传过来的参数,dnfileName是显示给下载用户看文件名的参数,在Action中初始化(因为如果文件名是中文的话,显示给用户会乱码,所以我直接把显示给用户看的设为当前时期+时间),<param name="inputName">downloadFile</param>这一句是意思代表Action中下载文件的方法名为getDownloadFile().

最后,看看Action中的相应代码:

        private String fileName;
        private String dnfileName;
        public String getFileName() {
        return fileName;
    }
    public void setFileName(String fileName) {
        this.fileName = fileName;
    }
    public String getDnfileName() {
        return dnfileName;
    }
    public void setDnfileName(String dnfileName) {
        this.dnfileName = dnfileName;
    }
        public String downloadfile() throws Exception {
        fileName = new String(fileName.getBytes("iso-8859-1"),"gbk");  
        System.out.println("fn="+fileName);
        Date d = new Date();
        dnfileName = (new SimpleDateFormat("yyyyMMddkkmmss").format(d)) + "." + (fileName.split("\\."))[1];
         return "success";
     }
    
    public InputStream getDownloadFile() throws UnsupportedEncodingException{
        System.out.println("fn2="+fileName);
        return ServletActionContext.getServletContext().getResourceAsStream("/upload/"+fileName);
        
    }