Struts2_文件上传

人有一个特点,越是得不到的东西,越想得到,越是不能接触的东西就越想接触。反过来,越容易得到的东西越不知珍惜。

文件上传的方法很简单,注意几个点:

1.在前端界面,表单中加上enctype="multipart/form-data"
2.在execute()方法中,要加上FileUtils.copyFile(photo[j], destFile);,因为表单上传后会作为一个临时文件存储,所以要用前面的代码将临时文件复制到目标文件夹中。

1.单文件上传

前段页面代码:

<%@ page language="java" pageEncoding="UTF-8" %>
<%@ page contentType="text/html; charset=UTF-8" %>


<html>
<head>
<meta  charset="UTF-8">
<title>上传界面title>
head>
<body>
<form action="login.action" method="post" enctype="multipart/form-data">
    姓名:<input type="text" name="username"><br>
    图片:<input type="file" name="photo"><br>
    <input type="submit" value="提交">
form>
body>
html>

struts代码:




    <struts>
    
        <constant name="struts.custom.i18n.resources" value="message"/>
    
        <constant name="struts.multipart.maxSize" value="5242880"/>
        <package name="root" namespace="/" extends="struts-default">
            <action name="login" class="com.action.LoginAction">
           
                <interceptor-ref name="fileUpload">
                
                    <param name="allowedTypes">
                        image/bmp,image/png,image/gif,image/pjpeg,image/jpg 
                    param>
                
                    <param name="maximumSize">2097152param>
                interceptor-ref>
                
                <interceptor-ref name="defaultStack"/>
                <result>/success.jspresult>
            action>
        package>
    struts>

Action代码:

package com.action;

import java.io.File;

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

public class LoginAction {
    private String username;
    private File photo;
    private String photoFileName;
    private String photoContentType;
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public File getPhoto() {
        return photo;
    }
    public void setPhoto(File photo) {
        this.photo = photo;
    }
    public String getPhotoFileName() {
        return photoFileName;
    }
    public void setPhotoFileName(String photoFileName) {
        this.photoFileName = photoFileName;
    }
    public String getPhotoContentType() {
        return photoContentType;
    }
    public void setPhotoContentType(String photoContentType) {
        this.photoContentType = photoContentType;
    }

    public String execute() throws Exception{
        return "success";
    }
}

完成以上功能,只是将文件上传到一个临时的目录中,如果要将文件保存到指定目录,需要对临时目录中的文件进行操作,往往需要对临时目录的文件进行复制操作。

public String execute() throws Exception{
    File destFile=new File(ServletActionContext.getServletContext().getRealPath("/upload/"+photoFileName));
    FileUtils.copyFile(photo, destFile);
    return "success";
    }

2.多文件上传

上传多个文件,只需将上例中与文件相关的属性改成数组格式,将上传的方法也改成操作数组即可。

Action代码:

package com.action;

import java.io.File;

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

public class LoginAction {
    private String username;
    private File[] photo;
    private String[] photoFileName;
    private String[] photoContentType;


    public String getUsername() {
        return username;
    }


    public void setUsername(String username) {
        this.username = username;
    }


    public File[] getPhoto() {
        return photo;
    }


    public void setPhoto(File[] photo) {
        this.photo = photo;
    }


    public String[] getPhotoFileName() {
        return photoFileName;
    }


    public void setPhotoFileName(String[] photoFileName) {
        this.photoFileName = photoFileName;
    }


    public String[] getPhotoContentType() {
        return photoContentType;
    }


    public void setPhotoContentType(String[] photoContentType) {
        this.photoContentType = photoContentType;
    }


    public String execute() throws Exception{
        for (int j = 0; j < photo.length; j++) {
            System.out.println(ServletActionContext.getServletContext().getRealPath("/upload/"+photoFileName));
            File destFile=new File(ServletActionContext.getServletContext().getRealPath("/upload/"+photoFileName[j]));
            FileUtils.copyFile(photo[j], destFile);

        }
        return "success";

    }
}

Struts2_文件上传_第1张图片

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