Struts2 框架实现多文件上传下载

web.xml配置:

<?xmlversion="1.0"encoding="UTF-8"?>
<web-appversion="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<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>*.action</url-pattern>
</filter-mapping>
</web-app>

struts.xml配置:

<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPEstrutsPUBLIC"-//ApacheSoftwareFoundation//DTDStrutsConfiguration2.1//EN""http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>

<constantname="struts.i18n.encoding"value="utf-8"/>

<packagename="file"extends="struts-default">
<actionname="showUpload">
<result>/upload.jsp</result>
</action>

<actionname="upload"class="com.boxun.hzw.action.UploadAction">
<resultname="input">/upload.jsp</result>
<result>/download.jsp</result>
<interceptor-refname="fileUpload">
<paramname="maximumSize">2097152</param>
<paramname="addowedTypes">image/bmp,image/jpg</param>
</interceptor-ref>
<interceptor-refname="defaultStack"></interceptor-ref>
</action>

<actionname="download"class="com.boxun.hzw.action.DownloadAction">
<resultname="success"type="stream">
<paramname="contentDisposition">attachment;filename="${fileName}"</param>
<paramname="inputName">downloadFile</param>
</result>
</action>

</package>
</struts>

后台实体类代码：

packagecom.boxun.hzw.bean;

publicclassUploadFiles{
privateStringuploadContentType;

privateStringuploadFileName;

privateStringuploadRealName;

publicStringgetUploadContentType(){
returnuploadContentType;
}

publicvoidsetUploadContentType(StringuploadContentType){
this.uploadContentType=uploadContentType;
}

publicStringgetUploadFileName(){
returnuploadFileName;
}

publicvoidsetUploadFileName(StringuploadFileName){
this.uploadFileName=uploadFileName;
}

publicStringgetUploadRealName(){
returnuploadRealName;
}

publicvoidsetUploadRealName(StringuploadRealName){
this.uploadRealName=uploadRealName;
}
}

上传Action类：

packagecom.boxun.hzw.action;

importjava.io.*;

importjava.util.ArrayList;
importjava.util.List;
importjava.util.UUID;

importorg.apache.commons.io.FileUtils;
importorg.apache.struts2.ServletActionContext;

importcom.boxun.hzw.bean.UploadFiles;
importcom.opensymphony.xwork2.ActionContext;
importcom.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("all")
publicclassUploadActionextendsActionSupport{
privatestaticfinallongserialVersionUID=1L;
privateFile[]upload;//实际上传文件
privateString[]uploadContentType;//文件的内容类型
privateString[]uploadFileName;//上传文件名
privateList<UploadFiles>uploadFiles=newArrayList<UploadFiles>();

publicStringexecute(){
StringtargetDirectory=ServletActionContext.getServletContext().getRealPath("/"+"images/");//获得路径
for(inti=0;i<upload.length;i++){
StringfileName=uploadFileName[i];//上传的文件名
Stringtype=uploadContentType[i];//文件类型
StringrealName=UUID.randomUUID().toString()+
getExt(fileName);//保存的文件名称、使用UUID+后缀进行保存
Filetarget=newFile(targetDirectory,realName);
try{
FileUtils.copyFile(upload[i],target);//上传至服务器的目录
}catch(IOExceptione){
e.printStackTrace();
returnINPUT;
}

//把路径()写入数据库---省略---
UploadFilesuf=newUploadFiles();//创建文件
uf.setUploadContentType(type);
uf.setUploadFileName(fileName);
uf.setUploadRealName(realName);
uploadFiles.add(uf);//添加到需要下载文件的List集合中
}
ServletActionContext.getRequest().setAttribute("uploadFiles",uploadFiles);
returnSUCCESS;
}

publicFile[]getUpload(){
returnupload;
}

publicvoidsetUpload(File[]upload){
this.upload=upload;
}

publicString[]getUploadContentType(){
returnuploadContentType;
}

publicvoidsetUploadContentType(String[]uploadContentType){
this.uploadContentType=uploadContentType;
}

publicString[]getUploadFileName(){
returnuploadFileName;
}

publicvoidsetUploadFileName(String[]uploadFileName){
this.uploadFileName=uploadFileName;
}

publicList<UploadFiles>getUploadFiles(){
returnuploadFiles;
}

publicvoidsetUploadFiles(List<UploadFiles>uploadFiles){
this.uploadFiles=uploadFiles;
}

publicstaticlonggetSerialversionuid(){
returnserialVersionUID;
}

publicstaticStringgetExt(StringfileName){
returnfileName.substring(fileName.lastIndexOf("."));
}

}

下载Action类：

packagecom.boxun.hzw.action;

importjava.io.InputStream;

importjava.io.UnsupportedEncodingException;

importorg.apache.struts2.ServletActionContext;

importcom.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("all")
publicclassDownloadActionextendsActionSupport{

privatestaticfinallongserialVersionUID=6329383258366253255L;

privateStringfileName;

privateStringfileRealName;


publicvoidsetFileName(){
//得到请求下载的文件名
Stringfname=ServletActionContext.getRequest().getParameter("name");
Stringfrealname=ServletActionContext.getRequest().getParameter("realname");
try{
/*
*对fname参数进行utf-8解码、注意：实际进行utf-8解码时会使用本地编码、本机为GBK。
*这里使用reqeust.setCharacterEncoding解码无效.
*只有解码了getDownloadFile()方法才能在下载目录下正确找到请求的文件
*/
fname=newString(fname.getBytes("ISO-8859-1"),"utf-8");
frealname=newString(frealname.getBytes("ISO-8859-1"),"utf-8");
}catch(UnsupportedEncodingExceptione){
e.printStackTrace();
}
this.fileName=fname;
this.fileRealName=frealname;

}

/*
*@getFileName此方法对应的是struts.xml文件中的:
*<paramname="contentDisposition">attachment;filename="${fileName}"</param>
*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、或无法下载情况
*@return
*/
publicStringgetFileName(){
try{
fileRealName=newString(fileRealName.getBytes(),"ISO-8859-1");
}catch(UnsupportedEncodingExceptione){
e.printStackTrace();
}
returnfileRealName;
}

/*
*@getDownloadFile此方法对应的是Struts.xml文件中的：
*<paramname="inputName">downloadFile</param>
*返回下载文件的流、可以参看Struts2的源码
*/
publicInputStreamgetDownloadFile(){
this.setFileName();
returnServletActionContext.getServletContext().getResourceAsStream("/"+"images/"+fileRealName);
}

@Override
publicStringexecute()throwsException{
returnSUCCESS;
}

}

上传jsp页面：

<%@pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
<html>
<head>
<basehref="<%=basePath%>">

<title>MyJSP'upload.jsp'startingpage</title>

<metahttp-equiv="pragma"content="no-cache">
<metahttp-equiv="cache-control"content="no-cache">
<metahttp-equiv="expires"content="0">
<metahttp-equiv="keywords"content="keyword1,keyword2,keyword3">
<metahttp-equiv="description"content="Thisismypage">
<!--
<linkrel="stylesheet"type="text/css"href="styles.css"mce_href="styles.css">
-->

</head>

<body>
<formaction="upload.action"method="post"enctype="multipart/form-data">
<table>
<tr>
<td>上传文件</td>
<td>标题：<inputtype="text"name="uploadFileName"/>
<inputtype="file"name="upload"/><br/>
标题：<inputtype="text"name="uploadFileName"/>
<inputtype="file"name="upload"/><br/>
标题：<inputtype="text"name="uploadFileName"/>
<inputtype="file"name="upload"/><br/>
标题：<inputtype="text"name="uploadFileName"/>
<inputtype="file"name="upload"/><br/>
标题：<inputtype="text"name="uploadFileName"/>
<inputtype="file"name="upload"/>
</td>
</tr>
<tr>
<td><inputtype="submit"value="提交"/></td>
<td><inputtype="reset"value="重置"/></td>
</tr>
</table>
</form>
</body>
</html>

下载jsp页面：

<%@pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%>
<%@taglibprefix="c"uri="http://java.sun.com/jsp/jstl/core"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
<html>
<head>
<basehref="<%=basePath%>">

<title>MyJSP'download.jsp'startingpage</title>

<metahttp-equiv="pragma"content="no-cache">
<metahttp-equiv="cache-control"content="no-cache">
<metahttp-equiv="expires"content="0">
<metahttp-equiv="keywords"content="keyword1,keyword2,keyword3">
<metahttp-equiv="description"content="Thisismypage">
<!--
<linkrel="stylesheet"type="text/css"href="styles.css"mce_href="styles.css">
-->

</head>

<body>
<c:forEachitems="${uploadFiles}"var="files">
<imgsrc="images/${files.uploadRealName}"mce_src="images/${files.uploadRealName}"alt="ds"width="200px"height="300px"/>
<ahref="download.action?name=${files.uploadFileName}&realname=${files.uploadRealName}"mce_href="download.action?name=${files.uploadFileName}&realname=${files.uploadRealName}">${files.uploadFileName}</a><br/>
</c:forEach>
</body>
</html>