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Struts2下传文件手动实现文件过滤

分类: IT文章 • 2024-09-21 08:08:07
Struts2上传文件手动实现文件过滤

在实现了上传的功能的情况下，再加一点点代码就可以实现手动文件类型过滤


客户端jsp请求 
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
		<title>简单的文件上传</title>
		<meta name="author" content="Yeeku.H.Lee" />
		<meta name="website" content="http://www.crazyit.org" />
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	</head>
	<body>
		<!--  <span style="color: red">${requestScope.typeError}</span> -->
		<s:debug></s:debug>
		<span style="color: red"> <s:property value="#typeError" /> </span>
		<form action="upload.action" method="post"
			enctype="multipart/form-data">
			文件标题：
			<input type="text" name="title" />
			<br />
			选择文件：
			<input type="file" name="upload" />
			<br />
			<input value="上传" type="submit" />
		</form>
	</body>
</html>

 


Action中部分代码 
package lee;


/**
 * 手动实现文件过滤
 */

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import javax.servlet.ServletContext;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.util.ServletContextAware;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class UploadAction extends ActionSupport implements 
ServletContextAware {
	//封装文件标题请求参数的属性
	private String title;
	//封装上传文件域的属性
	private File upload;
	//封装上传文件类型的属性
	private String uploadContentType;
	//封装上传文件名的属性
	private String uploadFileName;
	//定义Action允许过滤的文件类型
	private String allowTypes;
	
	private ServletContext context;
	
	@Override
	public String execute() throws Exception
	{
		//将允许上传文件类型的字符串以英文（,）分解成字符串数组
		//从而判断当前文件类型是否可以上传
		String filterResult = filterType(getAllowTypes().split(","));
		//System.out.println(getAllowTypes());
		//System.out.println( filterResult);
		if(filterResult != null){
			//此put方法是将值放在Stack Content中而不是Value Stack Contents中
			ActionContext.getContext().put("typeError", "你要上传的文件类型不正确!!!");
			return filterResult;
		}
		
		//以服务器的文件保存地址和原文件名建立上传文件输出流
		FileOutputStream fos = 
			new FileOutputStream(context.getRealPath("/upload")
			+ "\\" + getUploadFileName());
		FileInputStream fis = new FileInputStream(getUpload());
		byte[] buffer = new byte[1024];
		int len = 0;
		while ((len = fis.read(buffer)) > 0)
		{
			fos.write(buffer , 0 , len);
		}
		return SUCCESS;
	}
	
	//此方法用于过滤文件类型
	public String filterType(String[] types){
		//获取希望上传的文件类型
		String fileType = getUploadContentType();
		for (String type : types) {
			if(type.equals(fileType)){
				return null;
			}
		}
		return INPUT;
	}
	
	//文件标题的setter和getter方法
	public void setTitle(String title) 
	{
		this.title = title; 
	}
	public String getTitle()
	{
		return (this.title); 
	}
	//上传文件对应文件内容的setter和getter方法
	public void setUpload(File upload) 
	{
		this.upload = upload; 
	}
	public File getUpload() 
	{
		return (this.upload); 
	}
	//上传文件的文件类型的setter和getter方法
	public void setUploadContentType(String uploadContentType) 
	{
		this.uploadContentType = uploadContentType; 
	}
	public String getUploadContentType()
	{
		return (this.uploadContentType); 
	}
	//上传文件的文件名的setter和getter方法
	public void setUploadFileName(String uploadFileName) 
	{
		this.uploadFileName = uploadFileName; 
	}
	public String getUploadFileName() 
	{
		return (this.uploadFileName); 
	}
	public String getAllowTypes() {
		return allowTypes;
	}
	public void setAllowTypes(String allowTypes) {
		this.allowTypes = allowTypes;
	}
	
	public ServletContext getContext() {
		return context;
	}

	public void setContext(ServletContext context) {
		this.context = context;
	}

	public void setServletContext(ServletContext context) {
		this.context = context;
		
	}
	
}

 

Action只自己多一个方法要与过滤文件类型 

//此方法用于过滤文件类型
	public String filterType(String[] types){
		//获取希望上传的文件类型
		String fileType = getUploadContentType();
		for (String type : types) {
			if(type.equals(fileType)){
				return null;
			}
		}
		return INPUT;
	}

 


strut. xml文件（多设置一个参数用于限定文件的类型Action中直接取） 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
	"http://struts.apache.org/dtds/struts-2.1.dtd">	
<struts>
	<!-- 指定国际化资源文件的baseName为globalMessages -->
	<constant name="struts.custom.i18n.resources" value="globalMessages"/>
	<!-- 设置该应用使用的解码集 -->
	<constant name="struts.i18n.encoding" value="UTF-8"/>
	<package name="lee" extends="struts-default">
		<!-- 配置处理文件上传的Action -->
		<action name="upload" class="lee.UploadAction">
			<!-- 设置允许上传文件的文件类型 -->
			<param name="allowTypes">image/bmp,image/png,
			image/gif,image/jpeg</param>
			<!-- 上传失败退回input逻辑视图 -->
			<result name="input">/upload.jsp</result>
			<!-- 配置Struts 2默认的视图页面 -->
			<result>/succ.jsp</result>	
		</action>
	</package>
</struts>

 






 

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