使用servlet实现简易上传文件（带进度条版本）

效果图

xml配置文件

  

  
  
   
    
    
     This is the description of my J2EE component
    
    
    
     This is the display name of my J2EE component
    
    
    
     UploadServlet
    
    
    
     UploadServlet
    
  
   
  


  
   
    
    
     UploadServlet
    
    
    
     /UploadServlet
    
  
   

  

上传状态记录类uploadStatus

import org.omg.CORBA.LongHolder;


public class UploadStatus {
	private long bytesRead;
	private long contentLength;
	private int items;
	private long startTime=System.currentTimeMillis();
	public long getBytesRead() {
		return bytesRead;
	}
	public void setBytesRead(long bytesRead) {
		this.bytesRead = bytesRead;
	}
	public long getContentLength() {
		return contentLength;
	}
	public void setContentLength(long contentLength) {
		this.contentLength = contentLength;
	}
	public int getItems() {
		return items;
	}
	public void setItems(int items) {
		this.items = items;
	}
	public long getStartTime() {
		return startTime;
	}
	public void setStartTime(long startTime) {
		this.startTime = startTime;
	}
	
}

上传监听器

import org.apache.commons.fileupload.ProgressListener;


public class UploadListener implements ProgressListener {
	private UploadStatus uploadStatus;
	public UploadListener(UploadStatus uploadStatus) {
		// TODO Auto-generated constructor stub
		this.uploadStatus=uploadStatus;
	}

	@Override
	public void update(long arg0, long arg1, int arg2) {
		// TODO Auto-generated method stub
		uploadStatus.setBytesRead(arg0);
		uploadStatus.setContentLength(arg1);
		uploadStatus.setItems(arg2);
	}

}

servlet文件

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.List;

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

import org.apache.commons.fileupload.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;


@SuppressWarnings("deprecation")
public class UploadServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public UploadServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. 

	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. 

	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		//禁止浏览器缓存
				response.setHeader("Cache-Control", "no-store");
				response.setHeader("Pragrma", "no-cache");
				response.setDateHeader("Expires", 0);
				
				//获取session里面的上传状态属性，注意这里的getSession(true)括号里面是有true的
				UploadStatus status=(UploadStatus) request.getSession(true).getAttribute("uploadStatus");
				if(status==null)
				{
					response.getWriter().println("没有传送消息");
					return;
				}
				
				//以下是计算几个状态信息
				long startTime=status.getStartTime();
				long currTime=System.currentTimeMillis();
				long time=(currTime-startTime)/1000+1;
				double velocity=((double)status.getBytesRead())/(double)time;
				double totaltime=status.getContentLength()/velocity;
				double timeLeft=totaltime-time;
				int percent=(int)(100*(double)status.getBytesRead()/(double)status.getContentLength());
				double length=((double)status.getBytesRead())/1024/1024;
				double totalLength=((double)status.getContentLength())/1024/1024;
				
				//这里的"||"起到一个分隔符的作用，方便传到jsp文件时进行切割，详情请看jsp文件callback方法
				String value=percent+"||"+length+"||"+totalLength+"||"+velocity+"||"+
				time+"||"+totaltime+"||"+timeLeft+"||"+status.getItems();
				
				response.getWriter().println(value);
	}

	/**
	 * The doPost method of the servlet. 

	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	@SuppressWarnings({ "deprecation", "unchecked" })
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		request.setCharacterEncoding("utf-8");
		//此处必须设置编码方式为GBK,否则会出现文件名、目录名或是卷标语法不正确的错误，使用utf-8也不行，其他编码方式未尝试过
		response.setCharacterEncoding("GBK");
		PrintWriter out=response.getWriter();
		File file=null;
		
		UploadStatus uploadStatus=new UploadStatus();
		//上传状态监听器
		UploadListener listener=new UploadListener(uploadStatus);
		//把状态放到Session中，因为监听的原理是：服务器在处理上传文件的同时，将上传进度的信息例如
		//文件的总长度、已上传多少等写入到Session中，客户端浏览器利用Ajax技术再新开一个独立的线程
		//从Session中获取上传进度信息，并显示在界面中。
		request.getSession(true).setAttribute("uploadStatus", uploadStatus);
		//DiskFileUpload diskFileUpload=new DiskFileUpload();
		ServletFileUpload upload=new ServletFileUpload(new DiskFileItemFactory());
		upload.setProgressListener(listener);
		
		try {
			List
  
    fileItems=upload.parseRequest(request);
			for(FileItem item:fileItems)
			{
				if(item.isFormField())
				{
					//文本域，此处不介意说明
				}
				//文件域
				else {
					//获取原始文件
					file=new File(new String(item.getName().getBytes(),"GBK"));
					//输出原始文件路径，亲测file.getAbsolutePath()不能正确输出全路径
					out.println("文件客户端位置："+file.getCanonicalPath()+"
   
");
					
					//输出文件路径，此处设置为D盘下，可随意更改
					File file1=new File("D:\\",file.getName());
					//创建文件夹
					file1.getParentFile().mkdir();
					//创建文件
					file1.createNewFile();
			
					InputStream inputStream=item.getInputStream();
					
					OutputStream outputStream=new FileOutputStream(file1);
					try{
					byte [] b=new byte[1024];
					int len=0;
					while((len=inputStream.read(b))>-1)
					{
						outputStream.write(b,0,len);
					}
					out.println("已保存文件在"+file1.getAbsolutePath()+"
   
");
					}finally{
	
						inputStream.close();
						outputStream.close();
						
					}
				}
				
			}
		} catch (FileUploadException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			out.println("wrong");
		}
		out.println("解析完毕");
		out.flush();
		out.close();
	}

	/**
	 * Initialization of the servlet. 
   

	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}

  

jsp文件

<%@ page language="java" import="java.util.*" pageEncoding="utf-8" contentType="text/html"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>



  
    
    
    
	
  
	
  
	
      
	
  
	
  
	
  
	
  
  
  
   name="uploadiframe" width=0 height=0>
  
  
  	
  

    
   

    	
    
上传文件
    	
    

     
    		上传文件名称：
    		
     
    	
    
    	
    

     
    		对于文件的描述：
     
    	
    
    	
    

    	
      
    	
    
    
   
    
  
    
  
    
  

   
    	上传进度条：
    	
   

    

   
    	
   

    
  
    
  

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