j2ee之struts2文件下载
1、文件上传
首先要导入要用到的struts2的jar包
2、在web.xml中配置拦截器
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
3、在src目录下配置struts.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <!-- START SNIPPET: xworkSample --> <struts> <include file="/constant.xml"></include> </struts> <!-- END SNIPPET: xworkSample -->
4、写一个查询指定目录的文件列表的jsp，并提供下载链接
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>文件下载</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <table align="center" border="1" cellpadding="3" cellspacing="0"> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <tr> <th>序号</th> <th>文件名</th> <th>下载</th> </tr> <c:forEach var="list" items="${requestScope.files}" varStatus="statu"> <tr> <td>${statu.count }</td> <td>${list }</td> <c:url value="downFileAction_downFile" var="url"> <c:param name="fileName" value="${list}"></c:param> </c:url> <td> <a href="${url}">下载</a> </td> </tr> </c:forEach> </table> </body> </html>
5、写一个action用于向jsp页面传入文件列表，以及提供struts2文件下载所需要的输入流和文件名
package com.xinzhi.file; import java.io.File; import java.io.InputStream; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import java.util.Map; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport; public class FileDownAction extends ActionSupport { // 这段代码的主要功能是传入文件List public String down() throws Exception { String realPath = ServletActionContext.getServletContext().getRealPath( "/load"); File file = new File(realPath); String[] list = file.list(); Map<String, Object> request = ActionContext.getContext() .getContextMap(); request.put("files", list); return "success"; } /* * 以下代码的主要功能是进行文件的下载 */ private String fileName; public void setFileName(String fileName) { try { // 因为链接是通过get方式提交，为了防止乱码 fileName = new String(fileName.getBytes("ISO-8859-1"), "UTF-8"); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } this.fileName = fileName; } public String downFile() throws Exception { // 指定一个方法 return "download"; } public InputStream getAttrInputStream() { // 传入一个所需要的输入流 return ServletActionContext.getServletContext().getResourceAsStream( "/load/" + fileName); } public String getDownFileName() { try { // 规范链接格式 fileName = URLEncoder.encode(fileName, "UTF-8"); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } return fileName; } }
6、当前包下创建一个struts2文件下载配置文件
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <!-- START SNIPPET: xworkSample --> <struts> <package name="inputpackage" extends="struts-default" > <action name="downFileAction_*" class="com.xinzhi.file.FileDownAction" method="{1}"> <result name="success">/down.jsp</result> <result name="download" type="stream"><!-- 八进制流-octet八进制 --><param name="contentType">application/octet-stream</param> <param name="inputName">attrInputStream</param><!-- 文本部署-disposition部署 -附件attachement --><param name="contentDisposition">attachment;filename=${downFileName}</param> <param name="bufferSize">1024</param> </result> </action> </package> </struts>
7、至此文件下载就完成了
