1）创建应用并导入 JAR 包 2）创建 web.xml 文件
<?xml version="1.0" encoding="UTF-8"?> <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"> <display-name>SpringMVCFileDemo</display-name> <!--避免中文乱码--> <filter> <filter-name>encodingFilter</filter-name> <filter-class> org.springframework.web.filter.CharacterEncodingFilter </filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- 默认找 /WEB-INF/[servlet的名称]-servlet.xml --> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc-servlet.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>3）创建文件选择页面 在 WebContent 目录下创建 JSP 页面 oneFile.jsp，在该页面中使用表单上传单个文件，具体代码如下:
<%@ 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 action="${pageContext.request.contextPath }/onefile" method="post" enctype="multipart/form-data"> 选择文件：<input type="file" name="myfile"><br> 文件描述：<input type="text" name="description"><br> <input type="submit" value="提交"> </form> </body> </html>4）创建 POJO 类 声明一个 MultipartFile 类型的属性封装被上传的文件信息，属性名与文件选择页面 oneFile.jsp 中的 file 类型的表单参数名 myfile 相同。具体代码如下：
package pers.zhang.pojo; import org.springframework.web.multipart.MultipartFile; public class FileDomain { private String description; private MultipartFile myfile; public String getDescription() { return description; } public void setDescription(String description) { this.description = description; } public MultipartFile getMyfile() { return myfile; } public void setMyfile(MultipartFile myfile) { this.myfile = myfile; } }5）创建控制器类
package pers.zhang.controller; import java.io.File; import javax.servlet.http.HttpServletRequest; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.RequestMapping; import pers.zhang.pojo.FileDomain; @Controller public class FileUploadController { // 得到一个用来记录日志的对象，这样在打印信息时能够标记打印的是哪个类的信息 private static final Log logger = LogFactory.getLog(FileUploadController.class); /** * 单文件上传 */ @RequestMapping("/onefile") public String oneFileUpload(@ModelAttribute FileDomain fileDomain, HttpServletRequest request) { /* * 文件上传到服务器的位置“/uploadfiles”,该位置是指 * workspace\.metadata\.plugins\org.eclipse * .wst.server.core\tmp0\wtpwebapps, 发布后使用 */ String realpath = request.getServletContext() .getRealPath("uploadfiles"); String fileName = fileDomain.getMyfile().getOriginalFilename(); File targetFile = new File(realpath, fileName); if (!targetFile.exists()) { targetFile.mkdirs(); } // 上传 try { fileDomain.getMyfile().transferTo(targetFile); logger.info("成功"); } catch (Exception e) { e.printStackTrace(); } return "showOne"; } }6）创建 Spring MVC 的配置文件 在上传文件时需要在配置文件中使用 Spring 的 CommonsMultipartResolver 类配置 MultipartResolver 用于文件上传，应用的配置文件 springmvc-servlet.xml 的代码如下：
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 使用扫描机制扫描包 --> <context:component-scan base-package="pers.zhang" /> <!-- 完成视图的对应 --> <!-- 对转向页面的路径解析。prefix：前缀， suffix：后缀 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> <!-- 配置MultipartResolver，用于上传文件，使用spring的CommonsMultipartResolver --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="5000000" /> <property name="defaultEncoding" value="UTF-8" /> </bean> </beans>7）创建成功显示页面 在 WEB-INF 目录下创建 JSP 文件夹，并在该文件夹中创建单文件上传成功显示页面 showOne.jsp。具体代码如下：
<%@ 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> ${fileDomain.description } <br> <!-- fileDomain.getMyFile().getOriginalFilename()--> ${fileDomain.myfile.originalFilename } </body> </html>8）测试文件上传 文件上传到项目发布位置下的uploadfiles文件夹下：
