代码如下:
还要两个jar包
前台页面:
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> |
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<% |
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String path = request.getContextPath(); |
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String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; |
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%> |
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|
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<base href="<%=basePath%>"> |
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|
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<title>My JSP ‘index.jsp‘ starting page</title> |
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<meta http-equiv="pragma" content="no-cache"> |
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<meta http-equiv="cache-control" content="no-cache"> |
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<meta http-equiv="expires" content="0"> |
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<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> |
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<meta http-equiv="description" content="This is my page"> |
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<!-- |
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<link rel="stylesheet" type="text/css" href="styles.css"> |
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--> |
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|
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|
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<!-- |
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action:请求地址 |
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method:请求方式 get post |
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enctype:multipart/form-data 以二进制的形式向服务器传递参数 |
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--> |
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<form action="fileUp.do" method="post" enctype="multipart/form-data"> |
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<table> |
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<tbody><tr> |
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<td>请选择要上传的文件:</td> |
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<td><input type="file" name="file"></td> |
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</tr> |
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<tr> |
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<td><input type="submit" value="开始上传"></td> |
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</tr> |
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</tbody></table> |
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</form> |
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|
后端代码:
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package com.zengda; |
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import java.io.File; |
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import java.io.IOException; |
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import java.io.PrintWriter; |
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import java.util.Iterator; |
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import java.util.List; |
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import javax.servlet.http.HttpServlet; |
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import javax.servlet.http.HttpServletRequest; |
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import javax.servlet.http.HttpServletResponse; |
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import org.apache.commons.fileupload.FileItem; |
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import org.apache.commons.fileupload.FileUploadException; |
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import org.apache.commons.fileupload.disk.DiskFileItemFactory; |
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import org.apache.commons.fileupload.servlet.ServletFileUpload; |
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public class FileUpServlet extends HttpServlet{ |
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//重写HttpServlet里面的service方法 |
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public void service(HttpServletRequest request,HttpServletResponse response) |
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throws IOException{ |
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request.setCharacterEncoding("UTF-8");//设置编码 |
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response.setCharacterEncoding("GBK"); |
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//基于磁盘文件项目创建一个工厂对象 |
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DiskFileItemFactory factory = new DiskFileItemFactory(); |
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//创建一个新的文件上传对象 |
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ServletFileUpload upload = new ServletFileUpload(factory); |
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try { |
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//解析上传请求 |
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List items = upload.parseRequest(request); |
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Iterator itr = items.iterator();//枚举方法 返回迭代器 |
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while (itr.hasNext()) {//如果迭代器有数据 返回true 没数据返回false |
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FileItem fileItem = (FileItem)itr.next();//获取FileItem对象 |
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if(!fileItem.isFormField()){//判断是否为文件上传域 如果是文件上传域返回false 不是就返回true |
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long fileSize = fileItem.getSize();//获取文件的大小 |
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String fileName = fileItem.getName();//获取上传文件的名字(真实文件) |
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//构建一个临时对象,将文件暂时的保存在服务器的内存里面 |
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File tempFile = new File(fileName); |
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//根据servlet上下文获取上传路径 |
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String updatePath = this.getServletContext().getRealPath("/upload"); |
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//获取根目录对应的真实物理路径 |
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File file = new File(updatePath,tempFile.getName()); |
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//将文件上传 |
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fileItem.write(file); |
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PrintWriter out = response.getWriter();//获取输出流 |
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out.print("文件上传成功! "); |
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out.print("上传路径为: "+updatePath); |
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out.print("文件名: "+fileName); |
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out.print("文件的大小为: "+fileSize+" KB"); |
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} |
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} |
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} catch (FileUploadException e) { |
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e.printStackTrace(); |
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} catch (Exception e) { |
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e.printStackTrace(); |
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} |
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|
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} |
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} |
web.xml:
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<!--?xml version="1.0" encoding="UTF-8"?--> |
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<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> |
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<display-name>FileUp</display-name> |
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<welcome-file-list> |
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<welcome-file>index.html</welcome-file> |
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<welcome-file>index.htm</welcome-file> |
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<welcome-file>index.jsp</welcome-file> |
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<welcome-file>default.html</welcome-file> |
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<welcome-file>default.htm</welcome-file> |
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<welcome-file>default.jsp</welcome-file> |
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</welcome-file-list> |
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|
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<!-- 定义一个servlet --> |
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<servlet> |
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<servlet-name>file</servlet-name> |
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<servlet-class>com.zengda.FileUpServlet</servlet-class> |
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</servlet> |
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|
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<!-- 配置访问路径 --> |
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<servlet-mapping> |
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<servlet-name>file</servlet-name> |
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<url-pattern>/fileUp.do</url-pattern> |
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</servlet-mapping> |
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</web-app> |
时间： 2024-12-13 22:43:43