struts2 中的多个文件上传
在struts2中，struts单个文件上传比较简单的，如何动态的实现多个文件的上传，即我们想传几个文件就可以上传几个文件。其实多文件的上传和单个文件上传没有什么太大的区别，就是增加一个list集合，代码如下：package com.sport.action;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.util.List;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction2 extends ActionSupport {/** * 支持多文件上传 */private static final long serialVersionUID = 1L;/** * 上传的file的name值 */private List<File> file;/** * 上传的文件名字,自动获取 */private List<String> fileFileName;/** * 上传的文件类型，自动获取 */private List<String> fileContentType;public List<File> getFile() {return file;}public void setFile(List<File> file) {this.file = file;}public List<String> getFileFileName() {return fileFileName;}public void setFileFileName(List<String> fileFileName) {this.fileFileName = fileFileName;}public List<String> getFileContentType() {return fileContentType;}public void setFileContentType(List<String> fileContentType) {this.fileContentType = fileContentType;}@Override@SuppressWarnings("unchecked")public String execute() throws Exception {System.out.println(file.size());for(int i=0;i<file.size();i++){InputStream is = new FileInputStream(file.get(i));/** * 上传到逻辑路径不是物理路径 */String path=ServletActionContext.getRequest().getRealPath("/upload");System.out.println(path);File target = new File(path,this.getFileFileName().get(i));OutputStream os = new FileOutputStream(target);byte[] buffer = new byte;int count = 0;while((count=is.read(buffer))>0){os.write(buffer, 0, count);}is.close();os.close();}return SUCCESS;}@Overridepublic void validate() {System.out.println("----validate------");if(null==file){this.addActionError("上传文件不能为空");}}}
其余没什么变化 ，我们要做的就是用JavaScript实现动态添加文件上传框，镶嵌到网页代码中，代码如下：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags" %><!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>Insert title here</title><mce:script type="text/javascript"><!--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 = "删除"; button.onclick = function(){ td.removeChild(br); td.removeChild(input); td.removeChild(button); } td.appendChild(br); td.appendChild(input); td.appendChild(button); }// --></mce:script></head><body><table align="center" width="40%" border="1" > <s:form action="upload3" theme="simple" method="post" enctype="multipart/form-data"> <tr> <td width="20%">username:</td> <td width="80%"><s:textfield name="username"></s:textfield></td> </tr> <tr> <td>password:</td> <td><s:password name="password"></s:password></td> </tr> <tr> <td>file:</td> <td id="more"><s:file name="file"></s:file><input type="button" value="继续上传"></td> </tr> <tr> <td><s:submit value="提交"></s:submit></td> <td> <br><br></td> </tr> </s:form> </table></body></html>
struts.xml文件配置如下：
<action name="upload3" class="com.struts.UploadAction2"> <result name="success">/upload_success.jsp</result> <result name="input">/upload3.jsp</result> <interceptor-ref name="fileUpload"> <param name="maximumSize">409600</param><!-- 最大值 --> <param name="allowedTypesSet">application/vnd.ms-powerpoint</param><!-- 上传文件类型可以再tomcat下conf目录的web.xml查看各种文件类型信息--> </interceptor-ref> <interceptor-ref name="defaultStack"></interceptor-ref> </action>
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