struts的文件下载

一、jsp

 <body>
     <table border="1" align="center">
         <tr>
             <td>编号</td>
             <td>文件名</td>
             <td>操作</td>
         </tr>
         <c:forEach var="fileName" items="${fileNames}" varStatus="vs">
             <tr>
                 <td>${vs.count}</td>
                 <td>${fileName}</td>
                 <td>
                     <!-- 构建一个url -->
                     <c:url var="url" value="down_down">
                         <c:param name="fileName" value="${fileName}"></c:param>
                     </c:url>
                     <a href="${url}">下载</a>
                 </td>
             </tr>
         </c:forEach>
     </table>
  </body>

二、DownAction.java

/****************第二步:文件下载**********************/
    //1、获取下载的名字
    private String fileName;
    private void SetFileName(String fileName) {
        //传入中文,处理乱码问题
        try {
            fileName = new String(fileName.getBytes("ISO8859-1"),"UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
        this.fileName=fileName;
    }
    
    //2.下载提交的业务方法(在struts.xml中配置返回stream)
    public String down() {
        return "download";
    }
    
    //3.返回流的方法
    public InputStream getAttrInputStream(){
        return ServletActionContext.getServletContext().getResourceAsStream("/upload/" + fileName);
    }
    
    //4.下载显示的文件名
    public String getDownFileName() {
        //告诉浏览器编码格式
        try {
            fileName = URLEncoder.encode(fileName,"UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
        return fileName;
    }

三、

<action name="down_*" class="cn.itcast.e_fileupload.DownAction" method="{1}">
            <result name="list">/e/list.jsp</result>
            <!-- 下载操作 -->
            <result name="download" type="stream">
                <!-- 运行下载的文件类型:指定为所有的二进制文件类型 -->
                <param name="contentType">application/octet-stream</param>
                <!-- 对应的Action中的属性:返回流的属性【其实就是getAttrInputStream()】 -->
                   <param name="inputName">attrInputStream</param>
                   <!-- 下载头:包括浏览器显示的文件名 -->
                   <param name="contentDisposition">attachment;filename=${downFileName}</param>
                   <!-- 缓冲区设置 -->
                   <param name="bufferSize">1024</param>
            </result>
        </action>

 

posted on 2017-02-04 17:29  hgfs瑞  阅读(141)  评论(0编辑  收藏  举报

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