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
<%@ 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>
<%@ 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）
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 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
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;
}
}
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
<?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>
<?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>
struts上传下载多个文件
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转载自lanxulin.iteye.com/blog/2207561
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