这里有新鲜出炉的Java设计模式,程序狗速度看过来!
java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言,是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台(即JavaEE(j2ee), JavaME(j2me), JavaSE(j2se))的总称。
,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
这篇文章主要为大家详细介绍了java组件fileupload文件上传demo
在我们的web开发中,很多的时候都需要把本机的一些文件上传到web服务器上面去。
如:一个BBS系统,当用户使用这是系统的时候,能把本机的一些图片,文档上传到服务器上面去。然后其他用户可以去下载这些文件,那么这样的话,我们可以自己编程实现文件的上传,但是更好的方式是使用一些已有的组件帮助我们实现这种上传功能。
常用的上传组件:
Apache 的 Commons FileUpload
JavaZoom的UploadBean
jspSmartUpload
FileUpload下载地址:
http://commons.apache.org/fileupload/
下载:commons-fileupload-1.2.2-bin.zip 得到:commons-fileupload-1.2.2.jar
http://commons.apache.org/io/
下载:commons-io-1.4-bin.zip 得到:commons-io-1.4.jar
upload.jsp
代码;
- <%@ 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代码:
- 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;
- /**
- *
- * @author XHW
- *
- * @date 2011-7-26
- *
- */
- public class FileUploadServlet extends HttpServlet {
- private static final long serialVersionUID = -7744625344830285257L;
- private ServletContext sc;
- private String savePath;
- public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,
- IOException {
- doPost(request, response);
- }
- public void init(ServletConfig config) {
- // 在web.xml中设置的一个初始化参数
- savePath = config.getInitParameter("savePath");
- sc = config.getServletContext();
- }
- public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,
- IOException {
- request.setCharacterEncoding("UTF-8");
- DiskFileItemFactory factory = new DiskFileItemFactory();
- ServletFileUpload upload = new ServletFileUpload(factory);
- try {
- List items = upload.parseRequest(request);
- Iterator itr = items.iterator();
- while (itr.hasNext()) {
- FileItem item = (FileItem) itr.next();
- 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(sc.getRealPath("/") + savePath, 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代码:
- <%@ 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
代码:
- <?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>
- <!--设置初始化参数-->
- <init-param>
- <param-name>savePath</param-name>
- <param-value>uploads</param-value>
- </init-param>
- </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>
来源: http://www.phperz.com/article/17/1113/359730.html