【ServletFileUpLoad】上传本地文件到服务器

来源：互联网发布：ubuntu daemon 编辑：程序博客网时间：2024/06/06 00:26

一、项目需要的jar包

二、上传实例

package test23_2;import java.io.File;import java.io.IOException;import java.io.PrintWriter;import java.util.List;import java.util.UUID;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;import org.apache.commons.io.FileUtils;/* * 实现基本上传并对文件进行UUID重命名 */public class UploadServlet2 extends HttpServlet {public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");response.setContentType("text/html;charset=utf-8");PrintWriter out = response.getWriter();//1、设置临时上传的路径DiskFileItemFactory disk = new DiskFileItemFactory(10240,new File("e:disk"));//2、设置文件上传的目标路径String servePath = getServletContext().getRealPath("/serviceDisk");System.out.println(servePath+"-------------------------");//3、申明uploadServletFileUpload up = new ServletFileUpload(disk);//4、解析requesttry {List<FileItem> list = up.parseRequest(request);for(FileItem file:list){if(!file.isFormField()){//获取上传文件的名字String fileName = file.getName();fileName = fileName.substring(fileName.lastIndexOf("\\")+1);//获取上传文件的后缀String extName = fileName.substring(fileName.lastIndexOf("."));//申明UUIDString uuid = UUID.randomUUID().toString().replace("-", "");//组成新的名称String newName = uuid+extName;//上传文件FileUtils.copyInputStreamToFile(file.getInputStream(),new File(servePath+"/"+newName));//封装request.setAttribute("newName", newName);request.setAttribute("oldName", fileName);}}//转发request.getRequestDispatcher("jsps/show2.jsp").forward(request, response);} catch (FileUploadException e) {// TODO Auto-generated catch blocknew RuntimeException();}}}

三、前端选择上传文件实例

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'upload2.jsp' starting page</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>    <p>上传文件，重命名<p/> <br>    <form action="UploadServlet2" method="post" enctype="multipart/form-data">    上传图片<input type="file" name="imgs"/></br>    图片说明<input type="text" name="node"/></br>    <input type="submit" value="上传"/></br>        </form>  </body></html>

四、前端显示上传文件结果信息的实例

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'show2.jsp' starting page</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>   上传文件重命名UUID <br>   文件新名称 ${newName}</br>   文件上传名称 ${oldName}</br>   <img src="<c:url value='/serviceDisk/${newName}'/>"/>  </body></html>

五、上传流程介绍

通过前端上传页面，用户可以选择文件上传，上传核心类接收到请求后，处理请求。上传成功后，将图片信息转发到显示图片信息的前端页面展示。

阅读全文

0 0