基于Servlet+smartUpload的文件上传

2021-08-25 07:22:30

文件上传在web应用中是非常常见的，现在我就介绍下基于servlet的文件上传，基于Struts2的文件上传可以看：

页面端代码：

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>注册</title>

</head>

<body>

          <form name="form1" onsubmit="return on_submit()"

                action="RegisterServlet" method="post" enctype="multipart/form-data">

                                    <input type="text" name="uname1" id="password" />

                                    <input type="text" name="uname2" id="uname2"/>

                                    <input type="password" name="password1" id="password" />

                                    <input type="password" name="password2" id="password"/>

                                    <input type="radio" value="男" checked="checked" name="sex"/>男

                                     &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

                                    <input type="radio" value="女" name="sex"/>女

                                    <input type="text" name="email" value=""  class="box" id="login" />

                                    <br/><br/>

                                    <input type="file" name="file1" id="file"/>

                     <input type="submit" name="submit" value="完成注册" />

          </form>

</body>

</html>

这里要注意的一点就是存在文件上传的form表单必须封装为enctype="multipart/form-data"；这里我们直接与后台进行交互，不进行Ajax交互，需要使用ajax可以看：
http://www.cnblogs.com/shenliang123/category/372520.html

下面我们继续来看servlet的代码实现：

package com.xidian.bbs.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.net.InetAddress;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.Statement;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.jsp.JspFactory;

import javax.servlet.jsp.PageContext;

import com.jspsmart.upload.*;

import com.xidian.bbs.bean.Bean;

import com.xidian.bbs.bean.RegisterBean;

import com.xidian.bbs.util.DBAccess;

import com.xidian.bbs.util.IpTimeStamp;

@SuppressWarnings("serial")

public class RegisterServlet extends HttpServlet{

    protected void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        response.setContentType("text/html");

        response.setCharacterEncoding("GBK");

        request.setCharacterEncoding("GBK");

        SmartUpload smart=new SmartUpload();

        try{

        //PageContext是jsp的内置对象，在servlet不能直接使用，需要做一些处理

        JspFactory _jspxFactory = null;

         PageContext pageContext = null;

         _jspxFactory = JspFactory.getDefaultFactory();

         pageContext = _jspxFactory.getPageContext(this,request,response,"",true,8192,true);

        smart.initialize(pageContext);//初始化上传操作

        smart.upload();

        IpTimeStamp its=new IpTimeStamp(InetAddress.getLocalHost().getHostAddress());//request.getRemoteAddr()获得用户的ip地址

        //System.out.println("获取的ip为"+InetAddress.getLocalHost().getHostAddress());

        //如果要实现文件的批量上传，则只需用for循环，将getFile(0)中的0改为i即可

        String ext=smart.getFiles().getFile(0).getFileExt();//此为得到文件的扩展名,getFile(0)为得到唯一的一个上传文件

        String fileName=its.getIpTimeRand()+"."+ext;

        //System.out.println("获取 的文件名为"+fileName);

        //this.getServletContext().getRealPath("/")为得到tomcat的跟目录，放于upload文件夹中，java.io.File.separator是一种安全操作

        //String realPath="";

        //this.getServletContext().getRealPath("/")+

        smart.getFiles().getFile(0).saveAs("/headupload"+java.io.File.separator+fileName);

        String realPath="headupload/"+fileName+"";

        //

        //由于前面的form表单已经进行了封装，这里就不能简单的用request.getparameter()来获取表单参数

        String uname1 = smart.getRequest().getParameter("uname1");//昵称

        String upass1 = smart.getRequest().getParameter("password1");

        String sex = smart.getRequest().getParameter("sex");

        String uname2 = smart.getRequest().getParameter("uname2");//用户名

        String email = smart.getRequest().getParameter("email");

        PrintWriter out = response.getWriter();

                   //以下是持久层操作，省略。。。。。。。。。。

    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

            doGet(request,response);

    }

}

上面使用到的ip+时间戳的类IpTimeStamp对文件进行重命名：http://www.cnblogs.com/shenliang123/archive/2012/04/19/2456645.html

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