servlet3.0新特性的上传实现

最新推荐文章于 2023-11-20 08:50:48 发布

最新推荐文章于 2023-11-20 08:50:48 发布 · 131 阅读

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本文介绍如何使用Servlet 3.0进行文件上传操作，包括配置web.xml以支持文件上传，实现FileUploadServlet类来处理文件上传请求，并提供了一个简单的HTML表单用于测试。

servlet3.0上传写道

package com.org.servlet3;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
/**
* @project servlet3.0
* servlet3.0的文件上传
* @date:2012-5-21
*在创建项目的时候首先添加Tomcat7.x的支持,然后把apache-tomcat-7.0.27\conf\web.xml拷贝到项目WEB-INF目录下
*把之前的web.xml覆盖..
配置留下

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">

<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

</web-app>
*/
@SuppressWarnings("all")
@WebServlet(name="fileUploadServlet",urlPatterns="/fileUploadServlet")
@MultipartConfig(maxRequestSize=222222)//设置文件上传大小
public class FileUploadServlet extends HttpServlet {

/**
*访问
*http://localhost:8080/servlet3.0/
*/
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
Part part=req.getPart("file"); //获取页面的name
//System.out.println(part.getName());
System.out.println(System.getProperty("user.dir"));//输出当前的项目存放的路径
String uploadPath=req.getSession().getServletContext().getRealPath("/upload");
System.out.println(uploadPath);//输出上传的文件路径
String value=part.getHeader("content-disposition");//设置头信息
System.out.println(value);
String sub=value.substring(value.lastIndexOf("=")+2,value.length()-1);//截取文件
System.out.println("file size: \t"+part.getSize());//文件的大小
part.write(uploadPath+sub);//写入文件

}
}

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<form method="post" enctype="multipart/form-data" action="fileUploadServlet">

file:<input type="file" name="file"/><br/>
<input type="submit" value="submit"/>

</form>
</body>
</html>