第十六章文件上传

最新推荐文章于 2024-11-06 09:13:43 发布

转载最新推荐文章于 2024-11-06 09:13:43 发布 · 327 阅读

文章标签：

#image #string #file #exception #action #input

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上传页面：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>My JSP 'employeeAdd.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">
  </head>
  
  <body>
    <form action="${pageContext.request.contextPath}/control/employee/list_execute.action" enctype="multipart/form-data" method="post">
    	文件:<input type="file" name="image">
    	<input type="submit" value="上传"/>
    </form>
  </body>
</html>

pageContext.request.contextPath 绝对路径，取出部署应用程序名，解决不同部署方式的差别

enctype="multipart/form-data" 用于文件上传

上传到action的处理：

package cn.itcast.action;

import java.io.File;

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

import com.opensymphony.xwork2.ActionContext;


public class HelloWorldAction {
	private File image;
	private String imageFileName;
	
	public String getImageFileName() {
		return imageFileName;
	}

	public void setImageFileName(String imageFileName) {
		this.imageFileName = imageFileName;
	}

	public File getImage() {
		return image;
	}

	public void setImage(File image) {
		this.image = image;
	}

	public String addUI(){
		return "success";
	}

	public String execute() throws Exception{
		
		String realpath = ServletActionContext.getServletContext().getRealPath("/images"); // images文件夹绝对路径
		System.out.println(realpath);
		if(image!=null){
			File savefile = new File(new File(realpath), imageFileName); //创建一个目录下的file
			if(!savefile.getParentFile().exists()) savefile.getParentFile().mkdirs(); //文件夹不存在，则创建文件夹
			FileUtils.copyFile(image, savefile); //复制image到savefile
			ActionContext.getContext().put("message", "上传成功");
		}
		return "success";
	}
}