Struts2 file upload small Demo

File Upload:

Struts2 file upload Demo

Object encapsulation:
properties (can be omitted), get and set, tostring

1.index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.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">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>

  <body>
 <form action="Login" method="post" enctype="multipart/form-data">
  <input type="file" name ="imgs"><br>
  <input type="file" name ="imgs"><br>
  <input type="file" name ="imgs"><br>
  <input type="submit" value="上传">
  </form>
  </body>
</html>

2. Define an Action

xxFileName 不能改
private File[] imgs;
private String[] imgsFileName;

Get server path dynamically

for (int i = 0; i < imgs.length; i++) {
      String path = ServletActionContext.getServletContext().getRealPath("/image/");
      File destFil = new File(path, imgsFileName[i]);
      FileUtils.copyFile(imgs[i], destFil);
                        }

LoginAction complete code

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;

public class LoginAction {
    private File[] imgs;
    private String[] imgsFileName;// xxFileName 不能改

    public String execute() {

        try {
            // String path="c:/image";
            if (imgs != null) {
                // 如何获取服务器上的路径,上传一个文件夹
                // 动态获取服务器根路径
                for (int i = 0; i < imgs.length; i++) {
                    String path = ServletActionContext.getServletContext()
                            .getRealPath("/image/");
                    File destFil = new File(path, imgsFileName[i]);
                    FileUtils.copyFile(imgs[i], destFil);
                }
                return "success";
            }

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "input";
    }

    public File[] getImgs() {
        return imgs;
    }

    public void setImgs(File[] imgs) {
        this.imgs = imgs;
    }

    public String[] getImgsFileName() {
        return imgsFileName;
    }

    public void setImgsFileName(String[] imgsFileName) {
        this.imgsFileName = imgsFileName;
    }



}

3 Register to struts.xml

<package name="xxx" extends="struts-default">
              <action name="Login" class="com.lanou3g.action.LoginAction" >
                     <result>/success.jsp</result>
                     <result name="input">/index.jsp</result>
</package>

Filter: set file upload format: extension judgment

<interceptor-ref name="defaultStack">
<param name="fileUpload.allowedExtensions">jpg,png</param>
</interceptor-ref>

The default upload file size is 20M

<constant name="struts.multipart.maxSize" value="20971520"/>

struts2.xml complete code

<?xml version="1.0" encoding="UTF-8"?>
   <!DOCTYPE struts PUBLIC
       "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
       "http://struts.apache.org/dtds/struts-2.3.dtd";>
<struts>
       <package name="xxx" extends="struts-default">
              <action name="Login" class="com.action.LoginAction" >
                     <result>/success.jsp</result>
                     <result name="input">/index.jsp</result>
                     <!--扩展名-->
                     <interceptor-ref name="defaultStack">
                     <param name="fileUpload.allowedExtensions">jpg,png</param>
                     </interceptor-ref>
              </action>
       </package>
       <!--
       修改默认上传文件大小
       默认是2M
       -->
       <constant name="struts.multipart.maxSize" value="20971520"/>

</struts>

4. Jump to jsp page

sucess.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<html>
  <head>

  </head>

  <body>
 <h2>上传成功!</h2>
  </body>
</html>