fileupload简单使用

form.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>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

    <form action="/day22/demo1" enctype="multipart/form-data" method="post">

        用户名:<input type="text" name="username"><br>

        文件:<input type="file" name="f"><br>

        <input type="submit"><br>

    </form>

</body>

</html>

Demo1Servlet

package com;

import java.io.IOException;

import java.io.InputStream;

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.FileItem;

import org.apache.commons.fileupload.FileUploadException;

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

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

/**

 *文件上传

 */

public class Demo1Servlet extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        /*String username = request.getParameter("username");

        String f=request.getParameter("f");

        System.out.println(username);

        System.out.println(f);*/

        //创建磁盘文件项工厂

        DiskFileItemFactory factory = new DiskFileItemFactory();

        //创建核心上传对象

        ServletFileUpload upload = new ServletFileUpload(factory);

        //解析请求

        try {

            List<FileItem> list = upload.parseRequest(request);

            //遍历list

            for (FileItem fi : list) {

                //判断是普通的上传组件还是文件上传组件

                if(fi.isFormField()){

                    //普通的上传组件

                    //获取name属性

                    String name = fi.getFieldName();

                    //获取值

                    String string = fi.getString("utf-8");

                    System.out.println(name+"::"+string);

                }else{

                    //文件上传组件

                    //获取name属性

                    String name = fi.getFieldName();

                    //获取文件的名称

                    String filename = fi.getName();

                    //获取文件内容

                    InputStream is = fi.getInputStream();

                    System.out.println("文件:"+name+"::"+filename+"::"+is);

                }

            }

        } catch (FileUploadException e) {

            e.printStackTrace();

        }

    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // TODO Auto-generated method stub

        doGet(request, response);

    }

}

fileupload简单使用-LMLPHP