struts2多个文件上传

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1.创建Action类ListUpload.java

package action;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.util.List;import java.util.Random;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class ListUpload extends ActionSupport{/** *  */private static final long serialVersionUID = 4709924287629100425L;// 使用List封装多个上传文件域的对应的文件内容private List<File> doc;// 使用List封装多个上传文件域对应的文件类型private List<String> docContentType;// 使用List封装多个上传文件域对应的文件名private List<String> docFileName;private String path;public List<File> getDoc() {return doc;}public void setDoc(List<File> doc) {this.doc = doc;}public List<String> getDocContentType() {return docContentType;}public void setDocContentType(List<String> docContentType) {this.docContentType = docContentType;}public List<String> getDocFileName() {return docFileName;}public void setDocFileName(List<String> docFileName) {this.docFileName = docFileName;}public void setPath(String value) {this.path = value;}public String getPath() throws Exception {return ServletActionContext.getServletContext().getRealPath(path);}private String getFileName(String fileName){int position = fileName.lastIndexOf(".");String extension = fileName.substring(position);int random = new Random().nextInt(1000);return "" + System.currentTimeMillis() + random + extension;}@SuppressWarnings("resource")@Overridepublic String execute() throws Exception {for (int i = 0; i < doc.size(); i++) { //循环遍历整个docFileName.set(i, getFileName(docFileName.get(i)));FileOutputStream fos = new FileOutputStream(getPath() + "\\" + docFileName.get(i));File file = doc.get(i);FileInputStream fis = new FileInputStream(file);byte[] b = new byte[1024];int length = 0;while ((length = fis.read(b)) > 0) {fos.write(b, 0, length);}}return super.execute();}}

2.struts.xml中注册action

<action name="listUpload" class="action.ListUpload"><!-- 上传文件拦截，只能上传图片资源 --><interceptor-ref name="fileUpload"><!--allowedTypes允许上传的文件类型 --><param name="allowedTypes">image/x-png,image/gif,image/bmp,image/pjpeg</param><!-- 上传文件的大小单位 字节 --><param name="maximumSize">30000</param></interceptor-ref><interceptor-ref name="defaultStack"></interceptor-ref><param name="path">/upload</param><result name="success">/listSuccess.jsp</result><result name="input">/listUpload.jsp</result></action>

在src/action包下创建文件，命名格式为ActionName-conversion.properties。如ListUpload-conversion.properties，然后在该文件下添加如下内容：

Element_doc=java.io.File

其中doc为Action中封装的doc属性。

之所以这样做，是因为程序可能在运行的时候会报类型不匹配异常。

3.上传页面

listUpload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%><%@ taglib prefix="s" uri="/struts-tags"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>    <title>Struts 2使用List实现多个文件上传</title><link rel="stylesheet" type="text/css" href="Style.css"></head>  <body><center><div><%@ include file="top.html" %></div><h3>Struts 2使用List实现多个文件上传</h3><hr/><s:form action="listUpload" enctype="multipart/form-data"><s:file name="doc" label="选择上传文件"/><s:file name="doc" label="选择上传文件"/><s:file name="doc" label="选择上传文件"/><s:submit value="上传"/></s:form></center></body></html>

成功页面

listSuccess.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%><%@ taglib prefix="s" uri="/struts-tags"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>    <title>使用List上传多个文件成功</title><link rel="stylesheet" type="text/css" href="Style.css"><STYLE type="text/css"><!--ul.myUl{width: 450px;}ul.myUl li{width: 150px;float: left;}//--></STYLE></head>  <body><center><div><%@ include file="top.html" %></div><h3>使用List上传多个文件成功</h3><hr/><ul class="myUl"><s:iterator value="docFileName" status="st"><li>第<s:property value="#st.getIndex()+1"/>个图片：<br/><img src="upload/<s:property value="docFileName.get(#st.getIndex())"/>"/></li></s:iterator></ul></center></body></html>

运行程序。

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