struts2上传和下载文件

package com.zx.example.action;

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

import javax.servlet.http.HttpServletResponse;

import jxl.Workbook;
import jxl.format.Border;
import jxl.format.BorderLineStyle;
import jxl.read.biff.BiffException;
import jxl.write.Label;
import jxl.write.WritableCellFormat;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;
import com.zx.example.util.ConfigHelper;


@SuppressWarnings("serial")
public class FileAction extends ActionSupport {
	
    private static final Log log=LogFactory.getLog(FileAction.class);
    
	private File[] myFile;  //上传的文件
	
    public File[] getMyFile() {
		return myFile;
	}

	public void setMyFile(File[] myFile) {
		this.myFile = myFile;
	}
	
	private String[] myFileFileName; //上传的文件名
	
	public String[] getMyFileFileName() {
		return myFileFileName;
	}

	public void setMyFileFileName(String[] myFileFileName) {
		this.myFileFileName = myFileFileName;
	}
	
	private String[] myFileContentType; //上传的文件类型
	
	public String[] getMyFileContentType() {
		return myFileContentType;
	}

	public void setMyFileContentType(String[] myFileContentType) {
		this.myFileContentType = myFileContentType;
	}
	
	private String uploadDir;  //上传的目录

	public String getUploadDir() {
		return uploadDir;
	}

	public void setUploadDir(String uploadDir) {
		this.uploadDir = uploadDir;
	}
	
	
	public String fileUpload(){
		
		String fileDir=ServletActionContext.getServletContext().getRealPath(uploadDir);
		log.info("fileDir="+fileDir);
		for(int i=0;i<myFile.length;i++)	
		{   
			 log.info("myFileFileName["+i+"]="+myFileFileName[i]);
		     log.info("myFileContentType["+i+"]="+myFileContentType[i]);
		     
			 int pot=myFileFileName[i].lastIndexOf(".");
			 String suffix=myFileFileName[i].substring(pot,myFileFileName[i].length());
			 log.info("suffix="+suffix);
			 String newFileName=createNewFileName()+i+suffix;
			 log.info("newFileName="+newFileName);
			    
			 File dir=new File(fileDir);
			 if(!dir.exists())
			 {
			    dir.mkdir();
			  }
			   
			File newFile=new File(dir,newFileName);
			    
			copyFile(myFile[i], newFile);
			
		}
	   
		
		return SUCCESS;
	}

	
	
	/**
	 * 将源文件内容copy到目标文件中
	 * @param src 源文件，页面上传的文件
	 * @param dst 目标文件，重新命名并保存到服务器上的新文件
	 * @throws Exception
	 */
	public void copyFile(File src,File dst){
    	InputStream is=null;
    	OutputStream os=null;
    	try{
    		
    	  is = new BufferedInputStream(new FileInputStream(src));
          os = new BufferedOutputStream(new FileOutputStream(dst));
          byte buffer[] = new byte[8192];
          int len = 0;
          while((len = is.read(buffer))!=-1)
          {
             os.write(buffer, 0, len);
           }
        
     	}catch(IOException e){
     		
     		e.printStackTrace();
     		
     	}finally{
     		try{
     			if(is!=null)
     			{
     				is.close();
     			}
     				
     		}catch(IOException e)
     		{
     			e.printStackTrace();
     		}
     		
     		try{
     			if(os!=null)
     			{
     				os.close();
     			}
     				
     		}catch(IOException e)
     		{
     			e.printStackTrace();
     		}
     	}
    	
    }
	
	/**
	 * 利用系统当前时间生成新的文件名称
	 * @return
	 */
	public String createNewFileName(){
		Calendar now=Calendar.getInstance();
        String targetName=String.valueOf(now.get(now.YEAR))+String.valueOf(now.get(now.MONTH)+1);
        targetName+=String.valueOf(now.get(now.DAY_OF_MONTH))+String.valueOf(now.get(now.HOUR_OF_DAY));
        targetName+=String.valueOf(now.get(now.MINUTE))+String.valueOf(now.get(now.SECOND));
        return targetName;
	}
	
	/**
	 * 文件下载
	 * @throws  
	 * @throws IOException
	 */
	public void fileDownload(){
	   try{
		   
		ConfigHelper config=new ConfigHelper();  
		HttpServletResponse response=ServletActionContext.getResponse();
		String uploadDir=config.getMessage("upload");
		System.out.println("uploadDir="+uploadDir);
		String fileName="局数据制作单模板.xls";
		String template=config.getMessage("template_excel");
		File templateFile=new File(template);
		
		//将模板文件的内容拷贝到新文件中并保存到upload目录下
		File dir=new File("uploadDir");
		if(!dir.exists())
		{
			System.out.println("upload目录不存在");
			dir.mkdir();
		}
		File newFile=new File(dir,fileName);
		copy(templateFile,newFile);
		
		Workbook wb=Workbook.getWorkbook(newFile);
		WritableWorkbook book=Workbook.createWorkbook(newFile, wb);
		WritableSheet sheet=book.getSheet(0);
		
		 //属性样式定义
        WritableCellFormat itemFormat=new WritableCellFormat();
    	itemFormat.setAlignment(jxl.format.Alignment.CENTRE);
    	itemFormat.setVerticalAlignment(jxl.format.VerticalAlignment.CENTRE);
    	itemFormat.setBorder(Border.ALL, BorderLineStyle.THIN);
	  
		Label label=null;
		label=new Label(1,0,"河南工业大学2009",itemFormat);
		sheet.addCell(label);
		label=new Label(4,0,"2009-03-16",itemFormat);
		sheet.addCell(label);
		label=new Label(8,0,"紧急",itemFormat);
		sheet.addCell(label);
		
		label=new Label(1,1,"彭怀义",itemFormat);
		sheet.addCell(label);
		label=new Label(4,1,"郑州市正信科技发展有限公司",itemFormat);
		sheet.addCell(label);
		label=new Label(8,1,"13526884003",itemFormat);
		sheet.addCell(label);
		label=new Label(11,1,"[e-mail]",itemFormat);
		sheet.addCell(label);
		int j=3;
		while(j<10)
		{
			for(int i=0;i<24;i++)
			{
				label=new Label(i,j,"love",itemFormat);
				sheet.setRowView(j, 400);
				sheet.addCell(label);
			}
			j++;
		}
		book.write();
		book.close();
		wb.close();
		
		InputStream is=new BufferedInputStream(new FileInputStream(newFile));
		OutputStream os=new BufferedOutputStream(response.getOutputStream());
		fileName=new String(fileName.getBytes("GBK"),"ISO-8859-1");
		response.reset();
		response.setContentType("application/x-msdownload");
		response.setContentLength((int)newFile.length());
		response.setHeader("Content-Disposition", "attachment;filename="+fileName);
		
		byte[] buffer=new byte[8192];
		int len=0;
		while((len=is.read(buffer))!=-1)
		{
			os.write(buffer, 0, len);
		}
		is.close();
		os.close();
		
	   }catch(Exception e){
		   System.out.println("---->error="+e.getMessage());
		   e.printStackTrace();
	   }
	}
	
	/**
	 * 将templateFile的内容拷贝到newFile中
	 * @param templateFile
	 * @param newFile
	 */
	private void copy(File templateFile,File newFile)
	{
		try{
			
		InputStream is=new FileInputStream(templateFile);
		OutputStream os=new FileOutputStream(newFile);
		
		byte[] buffer=new byte[1024*4];
		
		int len=0;
		while((len=is.read(buffer))!=-1)
		{
			os.write(buffer, 0, len);
		}
		
		is.close();
		os.close();
		}catch(IOException e){
			e.printStackTrace();
		}
	}
	
	
}