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JavaEE-SpringMVC文件上传

17-11-22

JavaEE-SpringMVC文件上传。

问题导读:

1. 如何使用Commons FileUpload Commons IO 上传文件?

2. 如何利用Servlet 3.0 容器内置功能上传文件?

解决方案:

代码托管


文件上传


Commons FileUpload


对于Servlet 3.0 以下的Servlet 容器我们需要使用Apache Commons FileUpload 元件commons-fileupload-x.y.jar还需要Apache Commons 元件ommons-io-x.y.jar
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在Spring MVC 配置文件中定义multipartResolver bean
           <!-- multipartResolver 上传文件分解器 -->
           <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
           	<property name="maxUploadSize" value="2000000"></property>
           </bean>

bean 中添加一个 为 List<MultipartFile> 的属性
//产品图片
	private List<MultipartFile> images;
	public List<MultipartFile> getImages() {
		return images;
	}
	public void setImages(List<MultipartFile> images) {
		this.images = images;
	}

我们可以来看看Tomcat最近几个版本分别支持的JavaEE规范。 ------------------------
Tomcat 6: Servlet 2.5、JSP 2.1、EL 2.1
Tomcat7: Servlet 3.0、JSP 2.2、EL 2.2
Tomcat8: Servlet 3.1、JSP 2.3、EL 3.0
------------------------

除此以外,Tomcat 8还支持像Java WebSocket 1.0这样的新规范。

控制器


package controller;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;

import bean.Product;

@Controller
public class ProductController {

	@RequestMapping(value="/product_input")
	public String inputProduct(Model model) {
		model.addAttribute("product",new Product());
		return "ProductForm";
	}
	@RequestMapping(value="/product_save")
	public String saveProduct(HttpServletRequest servletRequest,
			@ModelAttribute("product") Product product,Model model) {
		
		/*
		 * 将上传的图片保存在相应目录下
		 */
		// 得到文件
		List<MultipartFile> images = product.getImages();
		List<String> imagesNames = new ArrayList<String>();
//		System.out.println(images.size());
		//判断 images 的 list 中是否有图片
		if(null != images && !images.isEmpty()) {
			// 遍历 list
			for(MultipartFile image : images) {
				// 返回客户端本地驱动器中的初始文件名
				String imageName = image.getOriginalFilename();
//				imagesNames.add(imageName);
				System.out.println(imageName);
				// 创建 file
				// Tomcat 的WebApps目录下该资源路径下的xxx
				File imageFile = new File(servletRequest.getServletContext().getRealPath("WEB-INF/image/"),imageName);
				// 保存文件
				try {
					image.transferTo(imageFile);
				} catch (IllegalStateException | IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
		return "ProductDetails";
	}
}

配置文件


<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="https://www.springframework.org/schema/beans"
       xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="https://www.springframework.org/schema/context"
       xmlns:mvc="https://www.springframework.org/schema/mvc"
       xsi:schemaLocation="https://www.springframework.org/schema/beans
           https://www.springframework.org/schema/beans/spring-beans.xsd
           https://www.springframework.org/schema/context
           https://www.springframework.org/schema/context/spring-context.xsd
           https://www.springframework.org/schema/mvc
           https://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">  
           <!-- 扫描包 -->    
           <context:component-scan base-package="controller" />
           <mvc:annotation-driven />
           <!-- 处理静态资源 -->
           <mvc:resources mapping="/image/**" location="/WEB-INF/image/" />
           <!-- 视图解析器 -->
           <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
           	<property name="prefix" value="/WEB-INF/jsp/" />
           	<property name="suffix" value=".jsp" />
           </bean>
           <!-- multipartResolver 上传文件分解器 -->
           <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
           	<property name="maxUploadSize" value="2000000"></property>
           </bean>
</beans>


JSP 页面


ProductForm


<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>添加商品</title>
</head>
<body>
	<p>
		<form action="product_save" method="post" enctype="multipart/form-data">
			<fieldset>
				<legend>添加商品</legend>
				<label for="name">商品名字:</label>
				<input type="text" id="name" name="name" value="" /><br/>
				<label for="description">商品描述:</label>
				<input type="text" id="description" name="description" value="" /><br/>
				<label for="price">商品价格:</label>
				<input type="text" id="price" name="price" value=""/><br/>
				<label for="image">商品图片</label></br>
				<input type="file" name="images[0]" /></br>
				<input type="file" name="images[1]" /></br>
				<input type="file" name="images[2]" /></br>
				<p>
					<input id="reset" type="reset" />
					<input id="submit" type="submit" value="添加商品" />
				</p>
			</fieldset>
		</form>
	</p>
</body>
</html>

ProductDetails


<%@ taglib uri="https://java.sun.com/jsp/jstl/core" prefix="c" %>    
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "https://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>商品详情</title>
</head>
<body>
	<p>
		<h4>该商品已经保存</h4>
		<p>
			<h5>详细信息</h5>
		 	商品名称:${product.name }</br>
		 	商品描述:${product.description }</br>
		 	商品价格:${product.price }</br>
		 	<h3>商品图片</h3>
		 	<ol>
		 		<c:forEach items="${ product.images}" var="image">
		 			<li>${image.originalFilename }
		 			<img width="100" src="<c:url value='/image/' />${image.originalFilename }"/>
		 			</li>
		 		</c:forEach>
		 	</ol>
		</p>
	</p>
</body>
</html>

测试


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Servlet 3.0 以上版本web容器上传文件


Servlet 3.0 以上版本web容器可以不使用Commons FileUpLoad 和Commons IO 元件

配置文件


web.xml


<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" 
xmlns="https://java.sun.com/xml/ns/javaee" 
xmlns:web="https://java.sun.com/xml/ns/javaee" 
xsi:schemaLocation="https://java.sun.com/xml/ns/javaee https://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <servlet>
  	<servlet-name>springmvc</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  	<init-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>classpath:conf/springmvc-config.xml</param-value>
  	</init-param>
  	<load-on-startup>1</load-on-startup>
  	<!-- 配置Servlet 3.0 文件上传 -->
  	<multipart-config>
  		<!-- 上传文件最大容量 -->
  		<max-file-size>20000000</max-file-size>
  		<!-- Http请求允许的最大容量 -->
  		<max-request-size>400000000</max-request-size>
  		<!-- 上传超过这个容量就会写入磁盘 -->
  		<file-size-threshold>1000000</file-size-threshold>
  	</multipart-config>
  </servlet>
  <servlet-mapping>
  	<servlet-name>springmvc</servlet-name>
  	<url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

springmvc-config.xml


多部分解析器:org.springframework.web.multipart.support.StandardServletMultipartResolver
 <bean id="multipartResolver" class="org.springframework.web.multipart.support.StandardServletMultipartResolver"></bean>

测试


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