【COS上传文件】实现文件重命名

来源：互联网发布：sql 截取字符串函数编辑：程序博客网时间：2024/05/16 15:58

【COS上传文件】实现文件重命名

一、功能描述

1、使用COS包实现文件的上传功能，其中上传的核心类是：MultipartRequest 重命名的类是： FileRenamePolicy

2、实现上传项目的结构：

二、上传实例

1、上传文件前端页面代码：在index.jsp文件中实现访问项目默认页面跳转到选择文件的jsp页面。

<%@ 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 'index.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>    This is my JSP page. <br>    <jsp:forward page="jsps/Upload.jsp"></jsp:forward>  </body></html>

2、选择上传文件页面

<%@ 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 'Upload.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>    This is my JSP page. <br>    <form action="UpServlet" method="post" enctype="multipart/form-data">    图片<input type="file" name="imgs"/></br>    <input type="submit" value="上传"/></br>    </form>  </body></html>

3、文件上传核心类

package com.test.cos;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.oreilly.servlet.MultipartRequest;import com.oreilly.servlet.multipart.DefaultFileRenamePolicy;import com.oreilly.servlet.multipart.FileRenamePolicy;public class UpServlet extends HttpServlet {public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");//申明文件上传的路径String path = getServletContext().getRealPath("/up");//设置一个名称FileRenamePolicy reName = new DefaultFileRenamePolicy();//开始上传，MultipartRequest构造方法的参数reName是DefaultFileRenamePolicy()的对象，这个必须有才能实现重命名。UTF-8没有就会出现乱码MultipartRequest req = new MultipartRequest(request,path,1024*1024*10,"UTF-8",reName);System.out.println("上传成功");//显示信息response.setContentType("text/html;charset=UTF-8");String oldName = req.getOriginalFileName("imgs");String newName = req.getFilesystemName("imgs");long size = req.getFile("imgs").length();String contentType = req.getContentType("imgs");PrintWriter out = response.getWriter();out.println("本地文件名称："+oldName+"<br/>"+"文件上传后重命名为："+newName+"<br/>"+"文件大小为："+size+"<br/>"+"文件类型："+contentType+"<br/>");out.println("上传成功");}}

三、测试上传文件

1、访问项目地址：http://127.0.0.1:8080/test24_1/ 项目默认访问index.jsp页面，在index.jsp页面中实现转发到Upload.jsp页面

2、上传文件的结果

在浏览器中输出上传文件的信息：

在tomcat设置的上传路径中显示上传的文件

阅读全文

0 0