uploadaction.java

是采用struts框架写关于文件上传的例子

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package com.songbing.upload.struts.action;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.upload.FormFile;

import com.songbing.upload.struts.form.UploadForm;

/** 
 * MyEclipse Struts
 * Creation date: 12-08-2008
 * 
 * XDoclet definition:
 * @struts.action validate="true"
 */
public class UploadAction extends Action {
	/*
	 * Generated Methods
	 */

	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		UploadForm uploadForm = (UploadForm)form;
		FormFile ff = uploadForm.getFile();
		String fileName = ff.getFileName();
		int fileSize = ff.getFileSize();
	
//		String path1=request.getServletPath();
//		System.out.println("path1:"+path1);
//		System.out.println(request.getSession().getServletContext().getRealPath("/"));
		String systemPath = request.getSession().getServletContext().getRealPath("");
		String filePath=systemPath+"/file";
		
		System.out.println(filePath);
		File file=new File(filePath,fileName);
		byte a[]=new byte[fileSize];
		try{
			InputStream in=ff.getInputStream();
			int read=0;                 //实际读出的文件长度
			int allread=0;               //共读出的文件长度
			while(allread<fileSize){
				read=in.read(a,allread,fileSize);
				allread+=read;
			}
			FileOutputStream out=new FileOutputStream(file);
			out.write(a);
			in.close();
			out.close();
        }
        catch(Exception e){
        	e.printStackTrace();
        }        
		return null;
	}
}