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Struts2_文件上传

2017-07-13 17:05 477 查看
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" %>

<!DOCTYPE html >
<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:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
"http://struts.apache.org/dtds/struts-2.5.dtd">

<struts>
<!-- 声明常量:关联自己写的proporties文件 -->
<constant name="struts.custom.i18n.resources" value="message"/>
<!-- 声明常量:配置文件上传的最大尺寸 -->
<constant name="struts.multipart.maxSize" value="5242880"/>
<package name="root" namespace="/" extends="struts-default">
<acti
b88d
on name="login" class="com.action.LoginAction">
<!-- 重写fileUpload拦截器 -->
<interceptor-ref name="fileUpload">
<!-- 允许上传的文件格式 -->
<param name="allowedTypes">
image/bmp,image/png,image/gif,image/pjpeg,image/jpg
</param>
<!-- 允许上传的文件最大尺寸 -->
<param name="maximumSize">2097152</param>
</interceptor-ref>
<!-- 注意:一定加上默认的拦截器,当引用了自己写的拦截器后默认的就不生效了 -->
<interceptor-ref name="defaultStack"/>
<result>/success.jsp</result>
</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";

}
}


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