struts2文件上传(一分钟学会)

最新推荐文章于 2021-10-15 17:05:09 发布

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本文详细介绍如何使用Apache Commons FileUpload组件在Struts2框架中实现文件上传功能，包括配置Struts2.xml，创建上传页面upload.jsp及上传Action类UploadAction，实现对上传文件大小、类型的有效控制。

1.Commons-FileUpload组件

Commons是Apache开放源代码组织的一个Java子项目，其中的FileUpload是用来处理HTTP文件上传的子项目。

2.Commons-FileUpload组件特点：

使用简单：可以方便地嵌入到JSP文件中，编写少量代码即可完成文件的上传功能
能够全程控制上传内容
能够对上传文件的大小、类型进行控制

3.下载包

需要下载Common-FileUplaod框架地址：

http://jakarta.apache.org/commons/fileupload/

–下载commons-fileupload-1.2-bin.zip文件

–解压后得到commons-fileupload-1.2.jar

http://jakarta.apache.org/commons/io/

–下载commons-io-1.3.2-bin.zip文件

–解压后得到commons-io-1.3.2.jar

4.案例

4.1文件上传页面upload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@ taglib uri="/struts-tags" prefix="s"%>
<!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>Insert title here</title>
</head>
<body>
 <%-- <s:form action="uploadAction" method="post" enctype="multipart/form-data">
        <s:file name="uploadImage" label="选择上传的文件" />
        <s:submit value="上传" />
 </s:form> --%>
<form action="uploadAction" method="post" enctype="multipart/form-data">
        文件：<input type="file" name="uploadImage">
        <input type="submit" value="提交">
    </form>

</body>
</html>

4.2配置Struts2.xml

<!-- 配置图片上传的Action -->
      <action name="uploadAction" class="com.liuyongqi.struts2.action.UploadAction">
        <interceptor-ref name="defaultStack">
                <param name="fileUpload.maximumSize">500000000</param>
                <param name="fileUpload.allowedTypes">image/jpeg</param>
                <param name="fileUpload.allowedExtensions">.jpg,.gif</param>
            </interceptor-ref>
         <result name="success" type="redirect">success.jsp</result>
         <result name="input" >/error.jsp</result>
      </action>

4.3上传Action类UploadAction

package com.liuyongqi.struts2.action;

import java.io.File;
import java.io.IOException;
import java.util.Date;

import javax.servlet.http.HttpSession;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;

/**
 * 配置图片上传的Action
 * @author Administrator
 *2018年7月16日下午4:21:41
 */
public class UploadAction extends ActionSupport{

	//得到上传的文件
	private File uploadImage; 
	//得到文件的类型
	private String uploadImageContentType;
	//得到文件的名称
	private String uploadImageFileName;
	public File getUploadImage() {
		return uploadImage;
	}
	public void setUploadImage(File uploadImage) {
		this.uploadImage = uploadImage;
	}
	public String getUploadImageContentType() {
		return uploadImageContentType;
	}
	public void setUploadImageContentType(String uploadImageContentType) {
		this.uploadImageContentType = uploadImageContentType;
	}
	public String getUploadImageFileName() {
		return uploadImageFileName;
	}
	public void setUploadImageFileName(String uploadImageFileName) {
		this.uploadImageFileName = uploadImageFileName;
	}
	
	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		System.out.println("fileName:"+this.getUploadImageFileName());
        System.out.println("contentType:"+this.getUploadImageContentType());
        System.out.println("File:"+this.getUploadImage());
        String date=new Date().getTime()+"";
        String filename =date +this.getUploadImageFileName();
        //获取要保存文件夹的物理路径(绝对路径)
        String realPath="C:\\work\\tomcat\\apache-tomcat-8.0.29\\webapps\\upload\\Struts2Upload\\";
        //String realPath=ServletActionContext.getServletContext().getRealPath("/upload");
        String virtualPath="/upload/Struts2Upload/"+filename;
        System.out.println(realPath);
        File file = new File(realPath);
        //测试此抽象路径名表示的文件或目录是否存在。若不存在，创建此抽象路径名指定的目录，包括所有必需但不存在的父目录。
        if(!file.exists()){
        	file.mkdirs();
        	//file.createNewFile();
        }
        try {
            //保存文件
            FileUtils.copyFile(uploadImage, new File(file,filename));
            System.out.println("成功");
            HttpSession session = ServletActionContext.getRequest().getSession();
            session.setAttribute("realPath", virtualPath);
        } catch (IOException e) {
            e.printStackTrace();
        }

		return "success";
	}


}

最后可以c's测试一下