Struts2多文件下载

Struts2多文件下载

Posted on 2012-07-01 12:02 CN.programmer.Luxh 阅读(2787) 评论(16) 编辑 收藏

　　使用场景：

　　1)在JSP页面，有一个展现附件的列表。

　　2)对列表中的每一个附件，提供单独下载。

　　3)同时提供复选框，提供选择多个文件下载。

                                                            

　　实现思路：

　　1）写一个通用的具有下载功能的Action，只需要接收一个文件路径就可以下载。单个附件的下载直接调用这个Action,只需要传递附件的路径即可。

　　2）多个文件下载，可以将多个文件的路径传递到一个处理Action，将多个文件打包成zip。然后重定向到通用的下载Action，同时传递zip包的路径给通用下载Action。

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　　1、通用的下载Action。

　　这个Action里面有一个成员变量fileName，负责接收传递的文件路径。

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package cn.luxh.struts2.action;   import java.io.BufferedInputStream; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.InputStream; import java.io.UnsupportedEncodingException;   import javax.servlet.http.HttpServletResponse;   import org.apache.struts2.ServletActionContext;   import com.opensymphony.xwork2.ActionSupport;     /**  * 文件下载  * @author Luxh  */ public class DownloadAction extends ActionSupport {         private static final long serialVersionUID = -3036349171314867490L;           //文件名     private String fileName;           public String getFileName() {         return fileName;     }       public void setFileName(String fileName) throws UnsupportedEncodingException {         //用UTF-8重新编码文件名,解决中文乱码         this.fileName = new String(fileName.getBytes("ISO-8859-1"),"UTF-8");     }           public InputStream getInputStream() throws UnsupportedEncodingException, FileNotFoundException{         HttpServletResponse response = ServletActionContext.getResponse();         //attachment,以附件的方式下载文件,会打开保存文件对话框;inline,以内联的方式下载,浏览器会直接打开文件         response.setHeader("Content-Disposition", "attachment;fileName="                   + java.net.URLEncoder.encode(fileName,"UTF-8"));//java.net.URLEncoder.encode(fileName,"UTF-8")  编码转换，解决乱码                    //如果fileName是相对路径         //return ServletActionContext.getServletContext().getResourceAsStream(fileName);         //如果fileName是绝对路径         return new BufferedInputStream(new FileInputStream(fileName));     }           @Override     public String execute() throws Exception {         return SUCCESS;     }               }

　　这个Action的配置文件：

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<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"     "http://struts./dtds/struts-2.3.dtd">   <struts>     <package name="download" namespace="/download" extends="default">                    <action name="download" class="cn.luxh.struts2.action.DownloadAction">             <result name="success" type="stream">                  <!-- 下载文件类型定义 -->                  <param name="contentType">application/octet-stream</param>                  <!-- 下载文件输出流定义 -->                  <param name="inputName">inputStream</param><br>　　　　　　　　　　　　　　　　　　<span><!-- 下载文件处理方式 --> </span><br><span>　　　　　　　　　　　　　　　　<param name="contentDisposition">attachment;filename="${fileName}"</param></span>                  <!-- 下载文件的缓冲大小 -->                  <param name="bufferSize">4096</param>             </result>         </action>               </package> </struts>

　　2、处理多个附件下载的Action。

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package cn.luxh.struts2.action;   import java.io.File; import java.text.SimpleDateFormat; import java.util.Date;   import cn.luxh.utils.ZipFileUtil;   import com.opensymphony.xwork2.ActionSupport;   /**  * 处理多个附件下载  * @author Luxh  */ public class MultiFileDownloadAction extends ActionSupport {       private static final long serialVersionUID = 2743077909387361587L;           //接收JSP页面传递过来的附件的路径     private String attachmentPath;           //最终压缩后的zip文件的路径，传递给通用的下载Action     private String fileName;             /**      * 下载多个附件      * 实现：将多个附近压缩成zip包,然后再下载zip包      */     public String downloadMultiFile() {         //使用当前时间生成文件名称         String formatDate =new  SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date());         //压缩后的zip文件存放路径         fileName = "D:/test/" + formatDate + ".zip";                   if(attachmentPath != null && !"".equals(attachmentPath)) {             //将多个附件的路径取出             String[] attachmentPathArray = attachmentPath.split(",");             if(attachmentPathArray != null && attachmentPathArray.length >0) {                 File[] files = new File[attachmentPathArray.length];                 for(int i=0;i<attachmentPathArray.length;i++) {                     if(attachmentPathArray[i] != null) {                         File file = new File(attachmentPathArray[i].trim());                         if(file.exists()) {                             files[i] = file;                         }                     }                 }                 //将多个附件压缩成zip                 ZipFileUtil.compressFiles2Zip(files,fileName);             }                       }         return SUCCESS;     }                 public String getAttachmentPath() {         return attachmentPath;     }     public void setAttachmentPath(String attachmentPath) {         this.attachmentPath = attachmentPath;     }     public String getFileName() {         return fileName;     }     public void setFileName(String fileName) {         this.fileName = fileName;     }               }

　　Action中的压缩文件类ZipFileUtil参考 http://www.cnblogs.com/luxh/archive/2012/06/28/2568758.html

　　配置文件：

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<!--将多个附件压缩后重定向到公共的下载Action下载文件  -->         <action name="downloadMultiFile" class="cn.luxh.struts2.action.MultiFileDownloadAction" method="downloadMultiFile">            <result type="redirectAction">                <param name="actionName">download</param>                <param name="nameSpace">/download</param>                <!--附件的完整路径  -->                <param name="fileName">${fileName}</param>            </result>        </action>

　　3、附件列表展现的JSP页面。

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<%@ page contentType="text/html;charset=UTF-8" language="java"%> <%@ taglib prefix="s" uri="/struts-tags"%> <%@ taglib uri="http://java./jsp/jstl/core" prefix="c"%> <!DOCTYPE html> <html>     <head>     <title>File Download</title>           <meta http-equiv="description" content="error">     <meta http-equiv="content-type" content="text/html; charset=UTF-8">           <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->           <script type="text/javascript" src="${pageContext.request.contextPath}/scripts/jquery-1.7.2.min.js"></script>     <script type="text/javascript">         function checkFile() {             if($("#all").attr("checked")){                 $("input[name='attachmentPath']").attr("checked",true);             }else {                 $("input[name='attachmentPath']").attr("checked",false);             }         }               </script>     </head>       <body>               <form  action="${pageContext.request.contextPath}/index/downloadMultiFile" method="post">             <table>                  <tr>                      <th>                             <input type="checkbox" name="all" id="all" onchange="checkFile()">全选                      </th>                       <th>                             文件名                      </th>                       <th>                             文件路径                      </th>                       <th>                             下载                      </th>                  </tr>                 <c:forEach items="${attachmentList}" var="attachment">                     <tr>                         <td>                             <input type="checkbox" name="attachmentPath" value="${attachment.filePath}">                         </td>                         <td>${attachment.fileName}</td>                         <td>${attachment.filePath}</td>                         <td>                             <a href="${pageContext.request.contextPath}/download/download?fileName=${attachment.filePath}">下载</a>                         </td>                     </tr>                 </c:forEach>             </table>             <tr>                 <td>                     <input type="submit" value="下载所选文件" id="submit">                 </td>             </tr>         </form>               </body> </html>