struts文件上传与下载简单DEMO
首先创建一个简单的project，配置其中的web.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>applicationProject</display-name>
<filter>
<!-- 配置Struts2核心Filter的名字 -->
<filter-name>struts2</filter-name>
<!-- 配置Struts2核心Filter的实现类 -->
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<!-- 配置Filter拦截的URL -->
<filter-mapping>
<!-- 配置Struts2的核心FilterDispatcher拦截所有用户请求 -->
<filter-name>struts2</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>/index.jsp</welcome-file>
</welcome-file-list>
</web-app>
index.jsp页面信息：
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<%@ page language="java" contentType="text/html;" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<title>文件上传</title>
</head>
<script type="text/javascript">
function checkf() {
var files = document.getElementsByName("file");
if (files[0].value.length != 0) {
return true;
} else {
alert("请选择文件");
return false;
}
}
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";
button.type = "button";
button.value = "Remove";
button.onclick = function() {
td.removeChild(br);
td.removeChild(input);
td.removeChild(button);
}
td.appendChild(br);
td.appendChild(input);
td.appendChild(button);
}
</script>
<body>
<form action="upload.action" method="post" enctype="multipart/form-data">
<table align="center" width="50%" border="1">
<tr>
<td>选择上传文件</td>
<td id="more">
<input type="file" id="file" name="file">
<input type="button" value="Add More.." onclick="addMore();">
</td>
</tr>
<tr>
<td><input type="submit" value="submit" onclick="return checkf();" /></td>
</tr>
</table>
<div>${fileTypeError}</div>
</form>
</body>
</html>
success.jsp页面信息：
<pre name="code" class="html"><%@ page language="java" contentType="text/html;" pageEncoding="utf-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>文件下载</title>
</head>
<body>
<s:form>
<div style="border:1px solid black">成功上传的文件:<br>
<ul style="list-style-type:decimal">
<c:forEach items="${fileNames}" var="viewFile" varStatus="ind" >
下载文件${ind.index+1}： <a href="download.action?filename=${viewFile}">${viewFile}</a></br>
</c:forEach>
</ul>
</div>
</s:form>
</body>
</html>
struts.xml文件信息：
<?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">
<struts>
<constant name="struts.i18n.encoding" value="utf-8"></constant>
<constant name="struts.multipart.saveDir" value="/upload"></constant>
<package name="struts2" namespace="/" extends="struts-default">
<action name="upload" class="com.huaxun.system.UpDownloadAction" method="upLoadFile">
<result name="input">/index.jsp</result>
<result name="success">/success.jsp</result>
<param name="maximumSize">409600</param>
<param name="savePath">/upload</param>
<param name="allowTypes">text/plain,text/xml,text/html,image/gif,image/png,image/jpeg,image/jpg,image/bmp</param>
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
<action name="download" class="com.huaxun.system.UpDownloadAction" method="downLoadFile">
<param name="savePath">/upload</param>
<result name="success">success.jsp</result>
<result name="input">/index.jsp</result>
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
</package>
</struts>
UpDownloadAction.java类信息：
package com.huaxun.system;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UpDownloadAction extends ActionSupport {
private static final long serialVersionUID = 1L;
private List<File> file;//这里的文件域名 一定要和表单中的file名相同
private List<String> fileFileName;//格式和“file”+FileName
private List<String> fileContentType;//上传文件 内容类型 file +"ContentType"
private String savePath;//上传文件保存的路径
private String allowTypes;//允许上传文件的类型
private HttpServletRequest request = ServletActionContext.getRequest();
public String upLoadFile() throws Exception {
List<String> typeList = getFileContentType();
String[] allowTs = getAllowTypes().split(",");
List<String> list =Arrays.asList(allowTs);
boolean result = true;//先判断上传的文件 是否为允许上传的文件类型
for (String type : typeList) {
if(!list.contains(type)){
result = false;
break;
}
}
//不允许
if(!result){
request.setAttribute("fileTypeError", "允许上传的文件类型为："+ getAllowTypes());
return INPUT;
}
//允许上传
InputStream is = null;//读取文件
OutputStream os = null;//写入文件
File desFile = new File(getSavePath());
if(desFile.mkdir()){
desFile.mkdir();
}
for (int i = 0; i < file.size(); i++) {
is = new FileInputStream(file.get(i));
os = new FileOutputStream(getSavePath()+"//"+this.getFileFileName().get(i));
byte[] buffer = new byte[1024];
int length = 0;
try{
while ((length = is.read(buffer)) > 0) {
os.write(buffer, 0, length);
}
}finally{
if(null != is){
is.close();
}
if(null != os){
os.close();
}
}
}
request.setAttribute("fileNames", fileFileName);
return SUCCESS;
}
public String downLoadFile() throws IOException{
String fileNameStr = request.getParameter("filename");
String fullName= getSavePath()+"\\"+fileNameStr;
InputStream inputStream = new FileInputStream(fullName);
HttpServletResponse response = ServletActionContext.getResponse();
OutputStream out = response.getOutputStream();
response.setCharacterEncoding("utf-8");
response.setHeader("Content-Disposition", "attachment;fileName=\"" + new String( fileNameStr.getBytes("gb2312"), "ISO8859-1" ) +"\"");
int leng = 0;
byte[] buffer = new byte[1024];
while((leng = inputStream.read(buffer, 0, buffer.length)) != -1){
out.write(buffer, 0, leng);
}
if(null != out){
out.close();
}
if(null != inputStream){
inputStream.close();
}
return null;
}
/**
* @return the file
*/
public List<File> getFile() {
return file;
}
/**
* @param file the file to set
*/
public void setFile(List<File> file) {
this.file = file;
}
/**
* @return the fileFileName
*/
public List<String> getFileFileName() {
return fileFileName;
}
/**
* @param fileFileName the fileFileName to set
*/
public void setFileFileName(List<String> fileFileName) {
this.fileFileName = fileFileName;
}
/**
* @return the fileNameContentType
*/
public List<String> getFileContentType() {
return fileContentType;
}
/**
* @param fileNameContentType the fileNameContentType to set
*/
public void setFileContentType(List<String> fileContentType) {
this.fileContentType = fileContentType;
}
/**
* @return the savePath
*/
public String getSavePath() {//获取绝对路径
return ServletActionContext.getServletContext().getRealPath(savePath);
}
/**
* @param savePath the savePath to set
*/
public void setSavePath(String savePath) {
this.savePath = savePath;
}
/**
* @return the allowType
*/
public String getAllowTypes() {
return allowTypes;
}
/**
* @param allowType the allowType to set
*/
public void setAllowTypes(String allowTypes) {
this.allowTypes = allowTypes;
}
}
效果图：
