实例:
第一步导入包：
commons-fileupload-1.2.1.jar
commons-io-1.3.2.jar
commons-logging-1.0.4.jar
freemarker-2.3.15.jar
ognl-2.7.3.jar
xwork-core-2.1.6.jar
struts.jar
commons-beanutils-1.7.0.jar
commons-digester.jar
第二上传upload,jsp、下载download.jsp的jsp页面
View Code
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@ taglib uri="/WEB-INF/taglib/struts-html.tld" prefix="html" %> <html:html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> <script type="text/javascript"> <!--addMore函数可以提供上传多个文件上传--> var index = 1; function addMore() { var td = document.getElementById("more"); var br = document.createElement("br"); var input = document.createElement("input"); var button = document.createElement("input"); input.type = "file"; input.name = "file["+index+"]"; button.type = "button"; button.value = " 删除 "; button.onclick = function() { td.removeChild(br); td.removeChild(input); td.removeChild(button); } td.appendChild(br); td.appendChild(input); td.appendChild(button); index ++; } </script> </head> <body> <!--<h3><font color="red">上传文件类型后缀为doc,ppt,xls,pdf,txt,java，每个文件大小不能大于50M</font></h3>--> <html:form action="/UpDownLoadAction.do?dispatch=upLoadFile" method="post" enctype="multipart/form-data"> <table align="center" width="50%" border="1"> <tr> <td> 上传文件 </td> <td id="more" > <input type="file" id="file_0" name="file[0]"/> <input type="button" value="上传更多..." onclick="addMore()"> </td> </tr> <tr> <td> <html:submit value=" 确认 "></html:submit> </td> <td> <html:reset value=" 重置 "></html:reset> </td> </tr> </table> </html:form> </body> </html:html>
View Code
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@page import="demo.updown.file.model.UploadFiles"%> <%@page import="java.util.*;"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <title>文件下载</title> </head> <body> <table align="center" width="50%" border="1"> <tr><td align="center">文件下载</td></tr> <%List files = (ArrayList)request.getAttribute("fileList"); for(int i = 0;i<files.size();i++){ UploadFiles file = (UploadFiles)files.get(i);%> <tr> <td> <a href="/updownfile/UpDownLoadAction.do?dispatch=downLoadFile&name=<%=file.getUploadRealName() %>&realname=<%=file.getUploadFileName() %>"> <%=file.getUploadFileName() %></a> </td> </tr> <%} %> </table> </body> </html>
第三步实体类（前台要显示的数据信息）
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public class UploadFiles { private String uploadFileName;//上传的文件名称 private String uploadContentType;//类型 private String uploadRealName;//保存的文件真实名称，UUID public String getUploadFileName() { return uploadFileName; } public void setUploadFileName(String uploadFileName) { this.uploadFileName = uploadFileName; } public String getUploadContentType() { return uploadContentType; } public void setUploadContentType(String uploadContentType) { this.uploadContentType = uploadContentType; } public String getUploadRealName() { return uploadRealName; } public void setUploadRealName(String uploadRealName) { this.uploadRealName = uploadRealName; }
第四步上传的业务接口与实现类
public interface UpDownLoad { public UploadFiles uploadfile(FormFile file)throws IOException; }
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public class UpDownLoadImpl implements UpDownLoad{ String path = "E:/apache-tomcat/apache-tomcat-6.0.18/webapps/updownfile/file"; public UploadFiles uploadfile(FormFile file) throws IOException { // TODO Auto-generated method stub String fileName = file.getFileName();//原文件名 String realName = UUID.randomUUID().toString() + fileName.substring(fileName.lastIndexOf("."));//保存的文件名称，使用UUID+后缀进行保存 //创建文件夹，保存上传文件 File filepath = new File(path); if (!filepath.isDirectory()) { filepath.mkdir(); } //文件上传后的路径 String filePath = filepath + "/" + realName; InputStream stream = file.getInputStream(); OutputStream bos = new FileOutputStream(filePath); int bytesRead = 0; byte[] buffer = new byte[8192]; while ((bytesRead = stream.read(buffer, 0, 8192)) != -1) { bos.write(buffer, 0, bytesRead); } bos.close(); stream.close(); //页面上显示上传的文件信息 UploadFiles files = new UploadFiles(); files.setUploadFileName(file.getFileName()); files.setUploadContentType(file.getContentType()); files.setUploadRealName(realName); return files; } }
第五步action
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public class UpLoadActionForm extends ActionForm { private static final long serialVersionUID = 1L; /** * struts1文件上传用的是调用的是专门上传的接口FormFile, * 单文件上传只需在Form中给一个FormFile类型的属性， * 多文件上传时，struts在页面端将多个文件封装成一个数组，转给Form类时转换成List * 所以我们在页面上使用数组形式对文件进行提交，在Form类中用List对文件进行接收。 * * */ private List<FormFile> files = new ArrayList<FormFile>(); public FormFile getFile(int i) { return files.get(i); } public void setFile(int i,FormFile file) { files.add(file); } public List getFiles(){ return files; } }
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public class UpDownLoadAction extends DispatchAction { /** * 上传文件 * */ public ActionForward upLoadFile(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws IOException { ActionForward forward = null; ActionMessages errors = new ActionMessages(); UpLoadActionForm upLoad = (UpLoadActionForm) form; List upLoads = upLoad.getFiles(); UpDownLoad updownload = new UpDownLoadImpl(); List fileList = new ArrayList(); for(int i = 0;i<upLoads.size();i++){ FormFile formFile = (FormFile) upLoads.get(i); //调用单个文件上传的方法 UploadFiles files = updownload.uploadfile(formFile); System.out.println("上传文件：" + files.getUploadFileName()); fileList.add(files); } request.setAttribute("fileList", fileList); return mapping.findForward("download"); } /** * 文件下载 * */ public ActionForward downLoadFile(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { String filename = request.getParameter("name"); String realname = request.getParameter("realname"); response.reset();//可以加也可以不加 response.setContentType("application/x-download");//设置为下载application/x-download /* * 这个属性设置的是下载工具下载文件时显示的文件名,要想正确的显示中文文件名，我们需要对fileName再次编码 * 否则中文名文件将出现乱码，或无法下载的情况 */ realname = URLEncoder.encode(realname, "UTF-8"); response.addHeader("Content-Disposition", "attachment;filename="+ realname);//下载文件时，显示的文件名 //下载文件的路径 String path = this.servlet.getServletContext().getRealPath("/file") + "/" + filename; OutputStream output = response.getOutputStream(); FileInputStream fis = new FileInputStream(path); byte[] b = new byte[1024]; int i = 0; while ((i = fis.read(b)) > 0) { output.write(b, 0, i); } output.flush(); fis.close(); output.close(); return null; } }
第六步web.xml和struts-config.xml
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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"> <web-app> <servlet> <servlet-name>action</servlet-name> <servlet-class> org.apache.struts.action.ActionServlet </servlet-class> <init-param> <param-name>config</param-name> <param-value>/WEB-INF/struts-config.xml</param-value> </init-param> <init-param> <param-name>debug</param-name> <param-value>3</param-value> </init-param> <init-param> <param-name>detail</param-name> <param-value>3</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>action</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> </web-app>
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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd"> <struts-config> <form-beans> <form-bean name="UpLoadActionForm" type="demo.updown.file.actionform.UpLoadActionForm" /> </form-beans> <action-mappings> <action path="/UpDownLoadAction" name="UpLoadActionForm" parameter="dispatch" scope="request" type="demo.updown.file.action.UpDownLoadAction" validate="true"> <forward name="download" path="/download.jsp"></forward> </action> </action-mappings> </struts-config>