web-文件上传_web-view上传文件-优快云博客

本文介绍了一个基于Java的文件上传示例，包括upload.jsp页面用于接收用户输入，FileUploadServlet处理文件上传逻辑，以及uploadResult.jsp显示上传结果。通过ServletFileUpload解析上传请求，并将文件保存到指定目录。

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upload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<html>
<head>
<title>using commons Upload to upload file </title>
</head>
<style>
* { font-family: "宋体"; font-size: 14px }
</style>
<body>
<p align="center"> 请您选择需要上传的文件</p>
<form id="form1" name="form1" method="post" action="servlet/fileServlet" enctype="multipart/form-data">
 <table border="0" align="center">
  <tr>
   <td>上传人：</td>
   <td>
    <input name="name" type="text" id="name" size="20" ></td>
  </tr>   
  <tr>
   <td>上传文件：</td>
   <td><input name="file" type="file" size="20" ></td>
  </tr>    
  <tr>   
   <td></td><td>
    <input type="submit" name="submit" value="提交" >
    <input type="reset" name="reset" value="重置" >
   </td>
  </tr>
 </table>
</form>
</body>
</html>

FileUploadServlet.java

package com.b510.example;

import java.io.File;
import java.io.IOException;
import java.util.*;


import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
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;

public class FileUploadServlet extends HttpServlet {

 private static final long serialVersionUID = -7744625344830285257L;
 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  doPost(request, response);
 }
 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  request.setCharacterEncoding("UTF-8");
  //1、创建一个DiskFileItemFactory工厂
  DiskFileItemFactory factory = new DiskFileItemFactory();
  //2、创建一个文件上传解析器
  ServletFileUpload upload = new ServletFileUpload(factory);
  try {
  //3、使用ServletFileUpload解析器解析上传数据，解析结果返回的是一个List<FileItem>集合，每一个FileItem对应一个Form表单的输入项
   List items = upload.parseRequest(request);
   System.out.println(items);
   //获取上传文件迭代器
   Iterator itr = items.iterator();
   while (itr.hasNext()) {
   //获取每个上传文件
    FileItem item = (FileItem) itr.next();
    //判断是表单数据还是上传文件，是表单数据的返回true
    if (item.isFormField()) {
     System.out.println("表单参数名:" + item.getFieldName() + "，表单参数值:" + item.getString("UTF-8"));
    } 
    else {
     if (item.getName() != null && !item.getName().equals("")) {
      System.out.println("上传文件的大小:" + item.getSize());
      System.out.println("上传文件的类型:" + item.getContentType());
      // item.getName()返回上传文件在客户端的完整路径名称
      System.out.println("上传文件的名称:" + item.getName());

      File tempFile = new File(item.getName());
      //上传文件的保存路径
      File file = new File("D://work", tempFile.getName());
      item.write(file);
      request.setAttribute("upload.message", "上传文件成功！");
     }else{
      request.setAttribute("upload.message", "没有选择上传文件！");
     }
    }
   }
  }catch(FileUploadException e){
   e.printStackTrace();
  } catch (Exception e) {
   e.printStackTrace();
   request.setAttribute("upload.message", "上传文件失败！");
  }
  request.getRequestDispatcher("/uploadResult.jsp").forward(request, response);
 }
}

uploadResult.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
    <title>uploadResult</title>
    
 <meta http-equiv="pragma" content="no-cache">
 <meta http-equiv="cache-control" content="no-cache">
 <meta http-equiv="expires" content="0">    
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 <meta http-equiv="description" content="This is my page">
 <!--
 <link rel="stylesheet" type="text/css" href="styles.css">
 -->

  </head>
  
  <body>
  ${requestScope['upload.message'] }
    <a href="/upload/uploadFile.jsp">上传文件</a>
  </body>
</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
 xmlns="http://java.sun.com/xml/ns/javaee" 
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>FileUploadServlet</servlet-name>
    <servlet-class>com.b510.example.FileUploadServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>FileUploadServlet</servlet-name>
    <url-pattern>/servlet/fileServlet</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
    <welcome-file>uploadFile.jsp</welcome-file>
  </welcome-file-list>
</web-app>