文件传输到服务器 servlet

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upload.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

</head>

<body>

</form>

</body>

</html>

Upload .java

package com.cqc.lesson004.file_upload_server.upload;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.text.SimpleDateFormat;

import java.util.Date;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItemIterator;

import org.apache.commons.fileupload.FileItemStream;

import org.apache.commons.fileupload.FileUploadException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class Upload extends HttpServlet{

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

try {

//得到输入流InputStream

DiskFileItemFactory factory=new DiskFileItemFactory();

ServletFileUpload upload=new ServletFileUpload(factory);

FileItemIterator iter=upload.getItemIterator(req);

FileItemStream stream=iter.next();

InputStream input=stream.openStream();

//获得文件后缀

String fileSuffix=stream.getName();

fileSuffix=fileSuffix.substring(fileSuffix.lastIndexOf("."));

//获取系统时间

Date date=new Date();

SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMddHHmmss");

String time=sdf.format(date);

//获取存储位置

//1、得到HttpSession

//2、得到ServletContext

String path=req.getSession().getServletContext().getRealPath("/")+time+fileSuffix;

FileOutputStream output=new FileOutputStream(path);

//传输

byte[] b=new byte[1024];

int length=0;

while((length=input.read(b))>0){

output.write(b, 0, length);

}

input.close();

output.close();

} catch (FileUploadException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

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