上传下载

最新推荐文章于 2023-11-30 18:26:31 发布

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最新推荐文章于 2023-11-30 18:26:31 发布

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本文链接：https://blog.youkuaiyun.com/DXINGYU/article/details/83018391

本文介绍如何使用Struts2框架实现文件的上传和下载功能。详细展示了配置文件、HTML表单、Action处理以及拦截器设置等关键部分，帮助读者理解Struts2中文件操作的实现机制。

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<%--

Created by IntelliJ IDEA.

User: elliott

Date: 2017/9/16

Time: 15:01

To change this template use File | Settings | File Templates.

--%>

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

<%@ taglib prefix="s" uri="/struts-tags" %>

<html>

<head>

</head>

<body>

<%--enctype="multipart/form-data" 提交文件必须要加上--%>

<s:form action="register" method="POST" theme="xhtml" enctype="multipart/form-data">

<s:textfield name="useranme" label="用户名"/>

<s:password name="password" label="密码"/>

<s:password name="repassword" label="确认密码"/>

<s:radio list="{'男', '女'}" label="性别" name="sex"/>

<s:radio list="#{1:'男', 2:'女'}" name="resex" label="确定性别"/>

<s:checkboxlist list="#{1:'影视', 2:'睡觉', 3:'游戏', 4:'音乐'}" label="爱好" name="hobby"/>

<s:select list="#{1:'北京',2:'河南',3:'山东'}" name="address" label="出生地"/>

<s:file label="头像" name="photo"/>

<s:file label="头像2" name="photo"/>

<s:textarea name="desc" label="个人简介"/>

<s:submit value="注册"/>

<s:reset value="点我"/>

</s:form>

</body>

</html>

package com.lanou.action;

import com.opensymphony.xwork2.ActionSupport;

import org.apache.commons.io.FileUtils;

import java.io.File;

import java.util.List;

/**

* 用于注册的Action

public class RegisterAction extends ActionSupport {

// 定义各种接收参数的属性

private String useranme;

private String password;

private String repassword;

private String sex;

private String resex;

private String[] hobby;

private String address;

// 文件对象

//private List<File> photo;

private File photo;

private String desc;

// 文件名字 File的属性名+FileName

private String photoFileName;

// 文件字段的类型 File的属性名+ContentType

private String photoContentType;

@Override

public String execute() throws Exception {

FileUtils.copyFile(photo, new File("upload/" + photoFileName));

return SUCCESS;

}

public void setUseranme(String useranme) {

this.useranme = useranme;

}

public String getUseranme() {

return useranme;

}

public void setPassword(String password) {

this.password = password;

}

public String getPassword() {

return password;

}

public void setRepassword(String repassword) {

this.repassword = repassword;

}

public String getRepassword() {

return repassword;

}

public void setSex(String sex) {

this.sex = sex;

}

public String getSex() {

return sex;

}

public void setResex(String resex) {

this.resex = resex;

}

public String getResex() {

return resex;

}

public String[] getHobby() {

return hobby;

}

public void setHobby(String[] hobby) {

this.hobby = hobby;

}

public void setAddress(String address) {

this.address = address;

}

public String getAddress() {

return address;

}

public File getPhoto() {

return photo;

}

public void setPhoto(File photo) {

this.photo = photo;

}

public void setDesc(String desc) {

this.desc = desc;

}

public String getDesc() {

return desc;

}

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;

}

<?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">

<interceptor-ref name="defaultStack">

<param name="fileUpload.allowedTypes">image/gif,image/png,image/jpeg</param>

</interceptor-ref>

<result name="success">/index.jsp</result>

</action>

<param name="contentType">${contentType}</param>

<param name="contentDisposition">attachment;filename=${downLoadFileName}</param>

<param name="inputName">inputStream</param>

</result>

</action>

</package>

</struts>

<%--

Created by IntelliJ IDEA.

User: elliott

Date: 2017/9/16

Time: 16:54

To change this template use File | Settings | File Templates.

--%>

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

<%@ taglib prefix="s" uri="/struts-tags" %>

<html>

<head>

</head>

<body>

<%--定义一个 url 网址--%>

<%-- download.action?fileName=飞机05.gif --%>

<s:url action="download" namespace="/" var="downurl">

<s:param name="fileName" value="%{'飞机05.gif'}"/>

</s:url>

<s:a href="%{#downurl}">下载</s:a>

</body>

</html>

package com.lanou.action;

import com.lanou.utils.DownloadUtils;

import com.opensymphony.xwork2.ActionSupport;

import org.apache.struts2.ServletActionContext;

import java.io.*;

public class DownLoadAction extends ActionSupport {

private String fileName;

private InputStream inputStream;

private String contentType;

private String downLoadFileName;

@Override

public String execute() throws Exception {

// fileName = new String(fileName.getBytes("ISO-8859-1"), "UTF-8");

// System.out.println(fileName);

return SUCCESS;

}

public String getFileName() {

return fileName;

}

public void setFileName(String fileName) {

this.fileName = fileName;

}

/**

* 生成下载时需要的文件流

* @return

* @throws UnsupportedEncodingException

* @throws FileNotFoundException

public InputStream getInputStream() throws UnsupportedEncodingException, FileNotFoundException {

// 文件名乱码转换

fileName = new String(fileName.getBytes("ISO-8859-1"), "UTF-8");

// 根据文件名生成文件流提供给下载时使用

FileInputStream fis = new FileInputStream("upload/" + fileName);

return fis;

}

/**

* 生成下载时候需要的ContentType

* @return

public String getContentType() {

// 获取当前文件的 MimeType

String type = ServletActionContext.getServletContext().getMimeType(fileName);

return type;

}

/**

* 生成下载的时候需要的文件名

* @return

* @throws UnsupportedEncodingException

public String getDownLoadFileName() throws UnsupportedEncodingException {

String name = DownloadUtils.getDownloadFileName(ServletActionContext.getRequest().getHeader("user-agent"), fileName);

return name;

}