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Spring MVC（四）文件上传

分类: IT文章 • 2022-07-29 19:15:28

文件上传步骤

　　1.写一个文件上传的页面
　　2.写一个文件上传的控制器
注意：
　　1.method="post"
　　2.enctype="multipart/form-data"
　　3.文件类型上传组件 type="file"
　　4.接收文件参数需要使用MultipartFile 类型的参数
　　5.配置文件解析器，文件解析器 id 必须是 "multipartResolver"

 1 <%@ page language="java" contentType="text/html; charset=utf-8"
 2     pageEncoding="utf-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     <form action="upload.do" method="post" enctype="multipart/form-data">
11         姓名：<input type="text" name="username"><br>
12         头像：<input type="file" name="mf"><br>
13         <input type="submit" value="上传">
14     </form>
15 </body>
16 </html>
upload.jsp 
 1 <%@ page language="java" contentType="text/html; charset=utf-8"
 2     pageEncoding="utf-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     <h1>欢迎进入</h1>
11     <img alt="程序猿" src="${imgPath }">
12 </body>
13 </html>
show.jsp 
 1 package com.xcz.controller;
 2 
 3 import java.io.File;
 4 import java.io.IOException;
 5 
 6 import javax.servlet.http.HttpServletRequest;
 7 
 8 import org.springframework.stereotype.Controller;
 9 import org.springframework.web.bind.annotation.RequestMapping;
10 import org.springframework.web.multipart.MultipartFile;
11 
12 @Controller
13 public class UploadController {
14     @RequestMapping("/toUpload.do")
15     public String toUpload() {
16         return "upload";
17     }
18 
19     @RequestMapping("/upload.do")
20     public String upload(String username, MultipartFile mf, HttpServletRequest request) {
21         String path = request.getServletContext().getRealPath("images");
22         String orname = mf.getOriginalFilename();
23         String fileName = System.currentTimeMillis() + orname.substring(orname.lastIndexOf("."));
24         String filePath = path + "/" + fileName;
25         File file = new File(filePath);
26         try {
27             mf.transferTo(file);
28             request.setAttribute("imgPath", "images/" + fileName);
29         } catch (IOException e) {
30             e.printStackTrace();
31         }
32         return "show";
33     }
34 }
UploadController 
 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:context="http://www.springframework.org/schema/context"
 5     xmlns:lang="http://www.springframework.org/schema/lang"
 6     xmlns:mvc="http://www.springframework.org/schema/mvc"
 7     xmlns:util="http://www.springframework.org/schema/util"
 8     xmlns:task="http://www.springframework.org/schema/task"
 9     xmlns:aop="http://www.springframework.org/schema/aop"
10     xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
11         http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.1.xsd
12         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
13         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
14         http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-4.1.xsd
15         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
16         http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.1.xsd">
17     <!-- 开启组件扫描 -->
18     <context:component-scan base-package="com.xcz"></context:component-scan>
19     <!-- 开启mvc标注 -->
20     <mvc:annotation-driven></mvc:annotation-driven>
21     <!-- 配置视图处理器 -->
22     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
23         <property name="prefix" value="/WEB-INF/"></property>
24         <property name="suffix" value=".jsp"></property>
25     </bean>
26     <!--  配置一个文件解析器 -->
27     <bean  >
28        <property name="maxUploadSize" value="102400"></property>
29        <property name="resolveLazily" value="true"></property>
30     </bean>  
31     <!-- 引入外部db.properties -->
32     <context:property-placeholder location="classpath:db.properties"/>
33     <!-- 配置数据源 -->
34     <bean >
35         <property name="driverClassName" value="${driverClassName}"></property>
36         <property name="url" value="${url}"></property>
37         <property name="username" value="${jdbc.username}"></property>
38         <property name="password" value="${jdbc.password}"></property>
39     </bean>
40 </beans>
mvc.xml 
 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3     xmlns="http://xmlns.jcp.org/xml/ns/javaee"
 4     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
 5     version="3.1">
 6     <display-name>SpringMVC-06</display-name>
 7     <welcome-file-list>
 8         <welcome-file>index.html</welcome-file>
 9         <welcome-file>index.htm</welcome-file>
10         <welcome-file>index.jsp</welcome-file>
11         <welcome-file>default.html</welcome-file>
12         <welcome-file>default.htm</welcome-file>
13         <welcome-file>default.jsp</welcome-file>
14     </welcome-file-list>
15     <!-- 配置请求入口 -->
16     <servlet>
17         <servlet-name>SpringMVC</servlet-name>
18         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
19         <!-- 配置初始化参数 -->
20         <init-param>
21             <param-name>contextConfigLocation</param-name>
22             <param-value>classpath:mvc.xml</param-value>
23         </init-param>
24         <load-on-startup>1</load-on-startup>
25     </servlet>
26     <servlet-mapping>
27         <servlet-name>SpringMVC</servlet-name>
28         <url-pattern>*.do</url-pattern>
29     </servlet-mapping>
30     <!-- 配置编码过滤器 -->
31     <filter>
32         <filter-name>filterEncoding</filter-name>
33         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
34         <init-param>
35             <param-name>encoding</param-name>
36             <param-value>utf-8</param-value>
37         </init-param>
38     </filter>
39     <filter-mapping>
40         <filter-name>filterEncoding</filter-name>
41         <url-pattern>*.do</url-pattern>
42     </filter-mapping>
43 </web-app>
web.xml

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