Struts2上传与下载(一)- 单文件上传

之前也写过Struts2的文件上传,可以参考一下:

Struts2文件上传(一)

Struts2文件上传(二)-文件上传拦截器


在这里,重新整理一下,介绍一下,上传与下载,首先是单文件上传

文件上传的话,需要:

1.一个上传文件的表单

2.一个做处理的Action

3.当然struts.xml不可少

1.upload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>文件上传示例</title>
</head>
<body>
	<h3>1.单文件上传</h3>
	<form action="file/common!upload" method="post" enctype="multipart/form-data">
		请选择文件:<input type="file" name="sgFile"><br/>
		
		<input type="submit" value="上传">
	</form>
</body>
</html>

2.FileAction

package com.deppon.demo.struts.action;

import java.io.File;

import org.apache.struts2.ServletActionContext;

import com.deppon.demo.struts.util.FileUtil;
import com.opensymphony.xwork2.ActionSupport;

public class FileAction extends ActionSupport {
	private static final long serialVersionUID = 3130770865205322375L;

	/**
	 * 这里是有一个对应关系的
	 */
	private File sgFile;//xxx
	private String sgFileFileName;//xxxFileName
	private String sgFileContentType;//xxxContentType

	public File getSgFile() {
		return sgFile;
	}

	public void setSgFile(File sgFile) {
		this.sgFile = sgFile;
	}

	public String getSgFileFileName() {
		return sgFileFileName;
	}

	public void setSgFileFileName(String sgFileFileName) {
		this.sgFileFileName = sgFileFileName;
	}

	public String getSgFileContentType() {
		return sgFileContentType;
	}

	public void setSgFileContentType(String sgFileContentType) {
		this.sgFileContentType = sgFileContentType;
	}
	
	/**
	 * 单文件上传
	 * @return
	 */
	public String upload() {
		System.out.println("sgFileFileName->" + sgFileFileName);//可以获取文件的名字
		System.out.println("sgFileContentType->" + sgFileContentType);
		
		/*
		 * 这里获取项目的绝对路径,有2种方法
		 * 目的都是获取ServletContext,然后,通过getRealPath(),来获取路径。
		 * 
		 */
		
		//1.使用ActionContext
//		ActionContext ac = ActionContext.getContext();
//		ServletContext sc = (ServletContext) ac.get(ServletActionContext.SERVLET_CONTEXT);   
//		String path = sc.getRealPath("/data");
		
		//2.使用ServletActionContext
		StringBuilder path = new StringBuilder(ServletActionContext.getServletContext().getRealPath("/data"));
		path.append(File.separator);
		path.append(sgFileFileName);
		
		FileUtil.save(sgFile, path.toString());
		
		return SUCCESS;
	}

}

3.struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
	<constant name="struts.i18n.encoding" value="utf-8"></constant>
	<constant name="struts.custom.i18n.resources" value="message"></constant>
	<constant name="struts.multipart.maxSize" value="20971520"/>
    <constant name="struts.devMode" value="true" />
    
    
    <package name="p_file" namespace="/file" extends="struts-default">
    	<action name="common" class="com.deppon.demo.struts.action.FileAction">
    		<result name="success" type="redirect">/upload_success.jsp</result>
    	</action>
    </package>
</struts>

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