Struts2多文件下載

殘妝殤殤 2013-05-13

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Struts2多文件下載

Posted on 2012-07-01 12:02 CN.programmer.Luxh 閱讀(2787) 評(píng)論(16) 編輯收藏

　　使用場(chǎng)景：

　　1)在JSP頁面，有一個(gè)展現(xiàn)附件的列表。

　　2)對(duì)列表中的每一個(gè)附件，提供單獨(dú)下載。

　　3)同時(shí)提供復(fù)選框，提供選擇多個(gè)文件下載。

　　實(shí)現(xiàn)思路：

　　1）寫一個(gè)通用的具有下載功能的Action，只需要接收一個(gè)文件路徑就可以下載。單個(gè)附件的下載直接調(diào)用這個(gè)Action,只需要傳遞附件的路徑即可。

　　2）多個(gè)文件下載，可以將多個(gè)文件的路徑傳遞到一個(gè)處理Action，將多個(gè)文件打包成zip。然后重定向到通用的下載Action，同時(shí)傳遞zip包的路徑給通用下載Action。

　　1、通用的下載Action。

　　這個(gè)Action里面有一個(gè)成員變量fileName，負(fù)責(zé)接收傳遞的文件路徑。

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;
 
 
/**
 * 文件下載
 * @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重新編碼文件名,解決中文亂碼
        this.fileName = new String(fileName.getBytes("ISO-8859-1"),"UTF-8");
    }
     
    public InputStream getInputStream() throws UnsupportedEncodingException, FileNotFoundException{
        HttpServletResponse response = ServletActionContext.getResponse();
        //attachment,以附件的方式下載文件,會(huì)打開保存文件對(duì)話框;inline,以內(nèi)聯(lián)的方式下載,瀏覽器會(huì)直接打開文件
        response.setHeader("Content-Disposition", "attachment;fileName="
                  + java.net.URLEncoder.encode(fileName,"UTF-8"));//java.net.URLEncoder.encode(fileName,"UTF-8")  編碼轉(zhuǎn)換，解決亂碼
          
        //如果fileName是相對(duì)路徑
        //return ServletActionContext.getServletContext().getResourceAsStream(fileName);
        //如果fileName是絕對(duì)路徑
        return new BufferedInputStream(new FileInputStream(fileName));
    }
     
    @Override
    public String execute() throws Exception {
        return SUCCESS;
    }
     
     
 
}

　　這個(gè)Action的配置文件：

<?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">
                 <!-- 下載文件類型定義 -->
                 <param name="contentType">application/octet-stream</param>
                 <!-- 下載文件輸出流定義 -->
                 <param name="inputName">inputStream</param><br>　　　　　　　　　　　　　　　　　　<span><!-- 下載文件處理方式 --> </span><br><span>　　　　　　　　　　　　　　　　<param name="contentDisposition">attachment;filename="${fileName}"</param></span>
                 <!-- 下載文件的緩沖大小 -->
                 <param name="bufferSize">4096</param>
            </result>
        </action>
         
    </package>
</struts>

　　2、處理多個(gè)附件下載的Action。

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;
 
/**
 * 處理多個(gè)附件下載
 * @author Luxh
 */
public class MultiFileDownloadAction extends ActionSupport {
 
    private static final long serialVersionUID = 2743077909387361587L;
     
    //接收J(rèn)SP頁面?zhèn)鬟f過來的附件的路徑
    private String attachmentPath; 
     
    //最終壓縮后的zip文件的路徑，傳遞給通用的下載Action
    private String fileName;
 
     
    /**
     * 下載多個(gè)附件
     * 實(shí)現(xiàn)：將多個(gè)附近壓縮成zip包,然后再下載zip包
     */
    public String downloadMultiFile() {
        //使用當(dāng)前時(shí)間生成文件名稱
        String formatDate =new  SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date());
        //壓縮后的zip文件存放路徑
        fileName = "D:/test/" + formatDate + ".zip";
         
        if(attachmentPath != null && !"".equals(attachmentPath)) {
            //將多個(gè)附件的路徑取出
            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;
                        }
                    }
                }
                //將多個(gè)附件壓縮成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中的壓縮文件類ZipFileUtil參考 http://www.cnblogs.com/luxh/archive/2012/06/28/2568758.html

　　配置文件：

<!--將多個(gè)附件壓縮后重定向到公共的下載Action下載文件  -->
        <action name="downloadMultiFile" class="cn.luxh.struts2.action.MultiFileDownloadAction" method="downloadMultiFile">
           <result type="redirectAction">
               <param name="actionName">download</param>
               <param name="nameSpace">/download</param>
               <!--附件的完整路徑  -->
               <param name="fileName">${fileName}</param>
           </result>
       </action>

　　3、附件列表展現(xiàn)的JSP頁面。

<%@ 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="${pageContext.request.contextPath}/index/downloadMultiFile" method="post">
            <table>
                 <tr>
                     <th>
                            <input type="checkbox" name="all" id="all" onchange="checkFile()">全選
                     </th>
                      <th>
                            文件名
                     </th>
                      <th>
                            文件路徑
                     </th>
                      <th>
                            下載
                     </th>
                 </tr>
                <c:forEach items="${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}">下載</a>
                        </td>
                    </tr>
                </c:forEach>
            </table>
            <tr>
                <td>
                    <input type="submit" value="下載所選文件" id="submit">
                </td>
            </tr>
        </form>
         
    </body>
</html>

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