struts2-18-上传多文件

上传多文件：数组或者集合

一：上传文件的主页面 upload.jsp

<%@ 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>上传文件主页面</title>
</head>
<body>
<s:fielderror/>
<form action="uploadAction" method="post" enctype="multipart/form-data">
<table border="1">
<caption>上传文件</caption>
<tr>
<th>上传标题</th>
<td><input type="text" name="title"></td>
</tr>
<tr>
<th>选择文件1:</th>
<td><input type="file" name="upload"></td>
</tr>
<tr>
<th>选择文件2:</th>
<td><input type="file" name="upload"></td>
</tr>
<tr>
<th>选择文件3:</th>
<td><input type="file" name="upload"></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" value="上传"></td>
</tr>
</table>
</form>
</body>
</html>

二：跳转到相应的action nuc.sw.action---uploadAction.java

package nuc.sw.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.UUID;

import com.opensymphony.xwork2.ActionSupport;

public class uploadAction extends ActionSupport {
private String title;
private File[] upload;
private String[] uploadFileName;
private String[] uploadContentType;
private String savePath;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}

public File[] getUpload() {
return upload;
}
public void setUpload(File[] upload) {
this.upload = upload;
}
public String[] getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(String[] uploadFileName) {
this.uploadFileName = uploadFileName;
}
public String[] getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(String[] uploadContentType) {
this.uploadContentType = uploadContentType;
}
public String getSavePath() {
return savePath;
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}

@Override
public String execute() throws Exception {
System.out.println(title);
System.out.println(upload);
System.out.println(uploadFileName);
System.out.println(uploadContentType);
System.out.println(savePath);
for(int i=0;i<upload.length;i++){
//输入流
FileInputStream fis=new FileInputStream(upload[i]);
//输出流
//上传两次一样的都会成功且显示两个，所以解决覆盖问题
FileOutputStream fos=new FileOutputStream(savePath+"/"+UUID.randomUUID().toString()+"_"+uploadFileName[i]);
//字节为单位上传
byte[] buffer=new byte[1024];
//定义长度
int len=0;
//从0开始
while((len=fis.read(buffer))>0){
fos.write(buffer, 0, len);
}
}
//不能写输入输出流
return SUCCESS;
}
}

三：配置struts.xml

1: 对文件的类型大小进行限制（实现文件过滤）

2：设置上传的文件的真实路径即将.tmp文件保存到savepath文件中

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5 
 6 <struts>
 7  <constant name="struts.devMode" value="true" />
 8  <!-- 设置文件的临时保存路径 -->
 9  <constant name="struts.multipart.saveDir" value="d:/tmpsaveDir"></constant>
10  <package name="default" namespace="/" extends="struts-default">
11      <action name="uploadAction" class="nuc.sw.action.uploadAction">
12          <!-- 需要去找源码：struts-default.xml中寻找拦截器  再关联源码 -->
13          <interceptor-ref name="fileUpload">
14               <!--设置上传的文件类型 -->
15                 <!-- 隐藏这一属性后，黑客可以随意上传修改后缀名的病毒文件 （实质没有改变）-->
16               <param name="allowedTypes">image/bmp,image/png,image/gif,image/jpeg,image/phpeg,text/plain</param>
17              <!-- 设置上传的文件的大小 -->
18              <param name="maximumSize">65535</param>
19              <!-- 设置上传文件的扩展名 -->
20              <param name="allowedExtensions">.txt</param>
21          </interceptor-ref>
22          <!-- 引用默认拦截器时，需要使用defaultStack -->
23          <interceptor-ref name="defaultStack"/>
24          <!-- 设置保存的真实路径 -->
25          <param name="savePath">d:/uploadRealFile</param>
26          <result name="success">/hello.jsp</result>
27          <result name="input">/upload.jsp</result>
28      </action>
29  </package>
30 </struts>

四：项目结构

五：运行结果