struts 上传文件

1,action类:

/**
 * 
 */
package org.jeelee.action;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.util.Date;

import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;

/**
 * @author JeeLee
 *
 */
public class UploadFileAction extends ActionSupport {
	private static final long serialVersionUID = 1L;
	private static final int BUFFER_SIZE = 16*1024;
	private File myFile ;
	private String contentType ;
	private String fileName ;
	private String caption ;
	private String imageFileName ;
	/**
	 * 用struts2标签<s:file/>实现上传文件要注意:
	 * <s:file name="xxx" />对应Action类里面的xxx、xxxContentType和xxxFileName三个属性
	 */
	public UploadFileAction() {
		// TODO Auto-generated constructor stub
	}
	
	/**
	 * 这个方法很关键,要想实现上传文件,这个方法是必须的(上传文件的MIME类型),
	 * 它是由<s:file/>标签绑定的:set+file标签名+FileContentType
	 * @author JeeLee
	 * @param contentType
	 */
	public void setMyFileContentType(String contentType)
	{
		this.contentType = contentType ;
	}
	/**
	 * 这个方法很重要,要想实现上传文件,这个方法是必须的(上传文件的文件名，该文件名不包括文件的路径),
	 * 它是由<s:file/>标签绑定的:set+file标签名+FileName
	 * @author JeeLee
	 * @param fileName
	 */
	public void setMyFileFileName(String fileName)
	{
		this.fileName = fileName ;
	}
	
	
	public String getMyFileContentType()
	{
		return contentType ;
	}
	
	public String getMyFileFileName()
	{
		return fileName ;
	}
	
	public void setMyFile(File myFile)
	{
		this.myFile = myFile ;
	}
	
	public File getMyFile()
	{
		return myFile ;
	}
	
	public void setCaption(String caption)
	{
		this.caption = caption ;
	}
	
	public String getCaption()
	{
		return caption ;
	}
	
	public void setImageFileName(String imageFileName)
	{
		this.imageFileName = imageFileName ;
	}
	
	public String getImageFileName()
	{
		return imageFileName ;
	}
	
	/**
	 * 复制文件
	 * @author JeeLee
	 * @param srcFile
	 * @param desFile
	 */
	public void copyFile(File srcFile,File desFile)
	{
		
		InputStream in = null ;
		OutputStream out = null ;
		
		try
		{
			in = new BufferedInputStream(new FileInputStream(srcFile),BUFFER_SIZE) ;
			out = new BufferedOutputStream(new FileOutputStream(desFile),BUFFER_SIZE) ;
			
			byte[] buffer = new byte[BUFFER_SIZE];
			while(in.read(buffer)>0)
			{
				out.write(buffer) ;
			}
		}
		catch(IOException e)
		{
			System.out.println("读取文件错误:"+e);
		}
		finally
		{
			try
			{
				if(in!=null)
				{
					in.close();
				}
				if(out!=null){
					out.close();
				}
			}
			catch(IOException e)
			{
				System.out.println("关闭文件失败:"+e);
			}
		}
	}

	/**
	 * 获得文件扩展名
	 * @author JeeLee
	 * @param fileName
	 * @return
	 */
	public String getExtention(String fileName)
	{
		System.out.println("file name ="+fileName);
		int pos = fileName.lastIndexOf(".");
		
		return fileName.substring(pos) ;
	}
	
	/**
	 * 上传文件的action
	 * @author JeeLee
	 * @return
	 */
	public String uploadFile()
	{
		 String imgFile;
		 System.out.println("test------------------");
		 imageFileName = new Date().getTime() + getExtention(fileName);
		 imgFile = ServletActionContext.getServletContext().getRealPath("/pic")+"/"+imageFileName ;
		 System.out.println("imgFile=="+imgFile);
		 File imageFile = new File(imgFile);
		 
		 copyFile(myFile,imageFile) ;
		 
		 return "UPLOAD:SUCCESS" ;
	}
	
	public String deleteFile()
	{
		myFile.delete();
		
		return "DELETE:SUCCESS" ;
	}
	
	/*@Override
	public String execute()
	{
		 imageFileName = new Date().getTime() + getExtention(fileName);
		 File imageFile = new File(ServletActionContext.getServletContext().getRealPath("/pic")+"/"+imageFileName);
		 
		 copyFile(file,imageFile) ;
		 
		 return SUCCESS ;
		 
	}*/

}

2,struts.xml文件配置:

<?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" />
	<package name="jeelee" extends="struts-default">
    	<!--上传文件-->
    	<action name="uploadFile" class="org.jeelee.action.UploadFileAction">
    		<result name="UPLOAD:SUCCESS">showUploadFile.jsp</result>
    		<result name="DELETE:SUCCESS">showUploadFile.jsp</result>
    	</action>
	</package>	
</struts>	

3,JSP文件:
上传页面:loadfile.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s"  uri="/struts-tags"%>
<!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>struts2 上传文件</title>
</head>
<body>
<s:form action="uploadFile.action" enctype ="multipart/form-data" >
	<s:file name="myFile" label="上传文件"></s:file>
	<s:textfield name="fileName" label="caption"></s:textfield>
	<s:submit name="ccc" method="uploadFile" value="上传"></s:submit>
	<s:submit name="ddd" method="deleteFile" value="删除"></s:submit>
</s:form>
</body>
</html>

显示结果页面:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s"  uri="/struts-tags"%>
<!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>struts2 上传文件结果显示</title>
</head>
<body>
 <div style ="padding: 3px; border: solid 1px #cccccc; text-align: center" > 
	<img src ='<s:property value ="imageFileName" />' />
	<br /> 
	<s:property value ="caption" /> 
</div > 

</body>
</html>