fileuploadaction.java

java实现文件上传下载功能,如：图片

package com.jiaheng.file.action;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class FileUploadAction extends ActionSupport{
	private static final int BUFFER_SIZE=800*1024;
	
	private File myFile;
	private String contentType;
	private String fileName;
	private String imageFileName;
	private String caption;
	
	
	public String getCaption() {
		return caption;
	}
	public void setCaption(String caption) {
		this.caption = caption;
	}
	public String getMyFileContentType() {
		return contentType;
	}
	public void setMyFileContentType(String contentType) {
		this.contentType = contentType;
	}
	public String getMyFileFileName() {
		return fileName;
	}
	public void setMyFileFileName(String fileName) {
		this.fileName = fileName;
	}
	public String getImageFileName() {
		return imageFileName;
	}
	public void setImageFileName(String imageFileName) {
		this.imageFileName = imageFileName;
	}
	public File getMyFile() {
		return myFile;
	}
	public void setMyFile(File myFile) {
		this.myFile = myFile;
	}
	
	/**
	 * getter()and setter()
	 * */
	private static void copy(File src,File dst){
		  try{
		   InputStream in =null;
		   OutputStream out = null;
		   try{
		    in = new BufferedInputStream(new FileInputStream(src),BUFFER_SIZE);
		    out = new BufferedOutputStream(new FileOutputStream(dst),BUFFER_SIZE);
		    byte[] buffer = new byte[BUFFER_SIZE];
		    while(in.read(buffer)>0){
		     out.write(buffer);
		    }
		   }finally{
		    if(null!=in){
		     in.close();
		    }
		    if(null!=out){
		     out.close();
		    }
		   }
		  }catch(Exception e){
		   e.printStackTrace();
		  }
		 }
	
	private static String getExtention(String fileName){
		int pos=fileName.lastIndexOf(".");
		return fileName.substring(pos);
	}
	
	public String execute(){
		imageFileName=new Date().getTime()+getExtention(fileName);
		File imageFile=new File(ServletActionContext.getServletContext().getRealPath("/UploadImages")+"/"+imageFileName);
		System.out.println("imageFileName"+imageFile);
		copy(myFile,imageFile);
		return SUCCESS;
	}


	

}