SpringMVC文件上传

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xyphf_和派孔明 2022-07-22 09:52:07 博主文章分类：JAVA的那些事儿 ©著作权

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SpringMVC文件上传

Spring框架提供了一个CommonsMultipartResolver组件,相当于上传文件的解析器，它可以调用
commons-fileupload.jar工具包将请求中的上传文件流信息解析出来保存到服务器的某个目录下。

步骤如下：
1 . 在spring配置CommonsMultipartResolver组件

<!-- 上传处理器,注意id必须为multipartResolver -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
</bean>

2 . 导入common-fileupload.jap和commons-io.jar包

3 .使用form 表单上传必须使用POST方式；
必须添加enctype=”multipart/form-data”,表示以字节流的形式

4 .Controller方法参数为MultipartFile类型接收。
由于multipartResolver 解析出来，所有Controller方法才能直接用MultipartFile接收文件对象。

写一个页面 upload.jsp

<%@ 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>
    <h1>文件上传</h1>
    <form action="upload.do" method="post" enctype="multipart/form-data">
        <input type="file" name="mf">
        <input type="submit" value="上传">
    </form>
</body>
</html>

配置spring-mvc.xml

<?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:context="http://www.springframework.org/schema/context" 
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"  
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.1.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.1.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.1.xsd">

    <!-- handlermapping -->
    <mvc:annotation-driven

    <!-- controller,dao -->
    <context:component-scan base-package="cn.up"/>

    <!-- viewresolver -->
    <bean id="viewresolver" 
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!-- 上传处理器,注意id必须为multipartResolver -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

    </bean>
</beans>

UploadController

package cn.up.controller;

import java.io.File;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class UploadController

    @RequestMapping("/toupload.do")
    public String toupload(){
        return "upload";
    }

    @RequestMapping("/upload.do")
    public String upload(HttpServletRequest request,@RequestParam("mf")MultipartFile file) throws Exception, IOException{
        // 将file文件放到目标位置
        // 1.获取images绝对路径
        String path = request.getServletContext().getRealPath("images");
        System.out.println(path);
        //如果路径不存在，创建
        File pathFile = new File(path);
        if(!pathFile.exists()){
            pathFile.mkdirs();
        }
        String fileName = file.getOriginalFilename();//原文件名
        File destFile = new File(path+"\\"+fileName);
        file.transferTo(destFile);//将文件保存
        request.setAttribute("image",fileName);
        return "ok";//ok.jsp
    }

    @RequestMapping("/upload1.do")
    public String upload1(HttpServletRequest request,@RequestParam("mf")MultipartFile file) throws Exception, IOException{
        // 将file文件放到目标位置
        String fileName = file.getOriginalFilename();//原文件名
        File destFile = new File("F:\\images\\"+fileName);
        file.transferTo(destFile);//将文件保存
        request.setAttribute("image",fileName);
        return "ok";//ok.jsp

web.xml

<?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_3_0.xsd" version="3.0">
  <display-name>springupload</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>

   <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:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>*.do</url-pattern>
 </servlet-mapping>
</web-app>

ok.jsp

<%@ 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>
<h1>上传成功。保存到了${image}</h1>
<img src="images/${image}">
</body>
</html>