struts2实现多文件上传

程序员文章站 2024-02-23 16:01:10

本文实例为大家分享了struts2实现多文件上传的具体代码，供大家参考，具体内容如下首先搭建好struts2的开发环境，导入struts2需要的最少jar包新建...

本文实例为大家分享了struts2实现多文件上传的具体代码，供大家参考，具体内容如下

首先搭建好struts2的开发环境，导入struts2需要的最少jar包

struts2实现多文件上传

新建upload.jsp页面，注意一定要把表单的enctype设置成multipart/form-data

<%@ page language="java" import="java.util.*" pageencoding="utf-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en">
<html>
 <head>
 <title>my jsp 'upload.jsp' starting page</title>
 
 <meta http-equiv="pragma" content="no-cache">
 <meta http-equiv="cache-control" content="no-cache">
 <meta http-equiv="expires" content="0"> 
 </head>
 
 <body>
 <s:fielderror name="fielderrors"></s:fielderror>
 <s:form theme="simple" action="upload" enctype="multipart/form-data" method="post">
  file:<s:file name="file"></s:file>
  filedesc:<s:textfield name="filedesc[0]"></s:textfield>
  <br/><br/>
  file:<s:file name="file"></s:file>
  filedesc:<s:textfield name="filedesc[1]"></s:textfield>
  <br/><br/>
  file:<s:file name="file"></s:file>
  filedesc:<s:textfield name="filedesc[2]"></s:textfield>
  <s:submit></s:submit>
 </s:form>
 </body>
</html>

新建一个uploadaction类，这个类主要有三个属性，并为这三个属性生成对应的set get方法

[file name] : 保存要上传的文件
[file name]contenttype : 保存要上传的文件类型
[file name]filename :保存上传的文件名

package cn.lfd.web.upload;
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;
/*
 * 多文件上传要把对应的属性类型都改为list集合，struts自动会把多个文件的数据封装到里面
 */
public class uploadaction extends actionsupport {
 private static final long serialversionuid = 1l;
 private list<file> file;
 private list<string> filecontenttype;
 private list<string> filefilename;
 private list<string> filedesc;
 
 public list<file> getfile() {
 return file;
 }
 
 public void setfile(list<file> file) {
 this.file = file;
 }
 
 public list<string> getfilecontenttype() {
 return filecontenttype;
 }
 
 public void setfilecontenttype(list<string> filecontenttype) {
 this.filecontenttype = filecontenttype;
 }
 
 public list<string> getfilefilename() {
 return filefilename;
 }
 
 public void setfilefilename(list<string> filefilename) {
 this.filefilename = filefilename;
 }
 
 public list<string> getfiledesc() {
 return filedesc;
 }
 
 public void setfiledesc(list<string> filedesc) {
 this.filedesc = filedesc;
 }
 
 @override
 public string execute() throws exception {
 //遍历文件集合，通过io流把每一个上传的文件保存到upload文件夹下面
 for(int i=0;i<file.size();i++) {
 //得到要保存的文件路径
 string dir = servletactioncontext.getservletcontext().getrealpath("/upload/"+filefilename.get(i));
 outputstream out = new fileoutputstream(dir);
 inputstream in = new fileinputstream(file.get(i));
 byte[] flush = new byte[1024];
 int len = 0;
 while((len=in.read(flush))!=-1) {
 out.write(flush, 0, len);
 }
 in.close();
 out.close();
 }
 return "input";
 }
}

然后在struts.xml配置文件中配置一下

<?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.custom.i18n.resources" value="message"></constant>
 <package name="default" extends="struts-default">
 <interceptors>
 <interceptor-stack name="lfdstack">
 <interceptor-ref name="defaultstack">
  <param name="fileupload.maximumsize">200000</param><!-- 限制上传的单个文件的大小 -->
  <param name="fileupload.allowedtypes">text/html,text/xml</param><!-- 限制上传的文件的类型 -->
  <param name="fileupload.allowedextensions">txt,html,xml</param><!-- 限制上传的文件的扩展名 -->
 </interceptor-ref>
 </interceptor-stack>
 </interceptors>
 <default-interceptor-ref name="lfdstack"></default-interceptor-ref>
 <action name="upload" class="cn.lfd.web.upload.uploadaction">
 <result>/success.jsp</result>
 <result name="input">/upload.jsp</result>
 </action>
 </package>
</struts>

在src目录下新建一个message.properties文件定制错误消息