javaWeb文件上传

来源：互联网发布：msxml是什么软件编辑：程序博客网时间：2024/05/19 13:23

首先要下载两个组件

commons-fileupload-1.3.1.jar

commons-io-2.4.jar

commons-fileupload-1.3.1.jar

commons-io-2.4.jar

FileUploadServlet .java

package com.bjsxt.shopping.servlet;

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;

importorg.apache.commons.fileupload.disk.DiskFileItemFactory;

importorg.apache.commons.fileupload.servlet.ServletFileUpload;

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

}

public void doPost(HttpServletRequest request,HttpServletResponse response)

throws ServletException, IOException {

request.setCharacterEncoding("GB18030");

DiskFileItemFactory factory = new DiskFileItemFactory();

ServletFileUpload upload = new ServletFileUpload(factory);

try {

List items = upload.parseRequest(request);

Iterator itr = items.iterator();

int id = -1;

while (itr.hasNext()) {

FileItem item = (FileItem) itr.next();

if (item.isFormField() &&item.getString().matches("\\d")) {

System.out.println("表单参数名:" item.getFieldName()

"，表单参数值:" item.getString("GB18030"));

id = Integer.parseInt(item.getString());

System.out.println("id:" id);

} 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());

System.out.println("servlet更目录：" sc.getContextPath());

// 上传文件的保存路径

File file = newFile("E:\\javaWEB阶段\\exercise\\Shopping\\WebRoot\\admin\\images\\product\\"id ".png");

System.out.println("文件路径:""E:\\javaWEB阶段\\exercise\\Shopping\\WebRoot\\admin\\images\\product\\"id ".png");

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();

System.out.println("上传失败！");

request.setAttribute("upload.message", "上传文件失败！");

}

request.getRequestDispatcher("./admin/uploadResult.jsp").forward(request,

response);

}

upload.jsp

<%@ page language="java" contentType="text/html;charset=GB18030"%>

String strId = request.getParameter("id");

int id = -1;

if(strId !=null &&!strId.trim().equals("")){

id = Integer.parseInt(strId);

}

<html>

<head>

<title>using commons Upload toupload 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>

<tr>

</tr>

<tr>

</td>

</tr>

</table>

</form>

</body>

</html>

uploadResult.java

<%@ page language="java" import="java.util.*"pageEncoding="GB18030"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01Transitional//EN">

<html>

<head>

<title>uploadResult</title>

<!--

-->

</head>

<body>

${requestScope['upload.message'] }

<ahref="./admin/upload.jsp">上传文件</a>

</body>

</html>

Web.xml

<?xml version="1.0"encoding="GB18030"?>

<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">

<description>This is thedescription of my J2EEcomponent</description>

<display-name>This is the displayname of my J2EEcomponent</display-name>

<servlet-name>FileUploadServlet</servlet-name>

<servlet-class>com.bjsxt.shopping.servlet.FileUploadServlet</servlet-class>

<init-param>

<param-name>savePath</param-name>

<param-value>E:/share/</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>FileUploadServlet</servlet-name>

<url-pattern>/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>

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