SpringMVC 单个或多个文件上传

1. 添加依赖

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.10.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>
    </dependencies>

2. 编写SpringMVC核心配置文件

<?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: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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
                            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

        <context:component-scan base-package="site.zhouyun.controller" />

        <mvc:annotation-driven />

        <!-- 视图解析器 -->
        <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/jsp/"></property>
            <property name="suffix" value=".jsp"></property>
        </bean>

        <!-- 文件上传解析器 -->
        <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
            <!-- 最大上传大小, 单位byte -->
            <property name="maxUploadSize" value="5242880" ></property>
            <!-- 默认编码 -->
            <property name="defaultEncoding" value="UTF-8"></property>
        </bean>
</beans>

3. 修改web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <!-- dispatcherServlet -->
    <servlet>
        <servlet-name>dispatcherServlet</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>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

4.　编写Controller

@Controller
@RequestMapping("upload")
public class FileUploadController
{
    /**
     * 单文件上传
     * @param uploadFile
     * @return
     * @throws IOException
     */
    @ResponseBody
    @RequestMapping("file")
    public String fileUpload(MultipartFile uploadFile) throws IOException
    {
        System.out.println("uploadFile: " + uploadFile);
        if(uploadFile != null)
        {
            // 获取文件名
            String filename = uploadFile.getOriginalFilename();
            System.out.println("filename: " + filename);
            // 保存路径
            uploadFile.transferTo(new File("/home/cloud/temp/" + filename));
            return "upload success!";
        }
        return "upload error!";
    }

    /**
     * 多文件上传
     * @param uploadFile
     * @return
     * @throws IOException
     */
    @ResponseBody
    @RequestMapping("files")
    public String filesUpload(MultipartFile[] uploadFile) throws IOException
    {
        for (MultipartFile multipartFile : uploadFile)
        {
            if(uploadFile != null)
            {
                String filename = multipartFile.getOriginalFilename();
                System.out.println("filename: " + filename);
                multipartFile.transferTo(new File("/home/cloud/temp/" + filename));
            }
            else
            {
                return "upload error!";
            }
        }
        return "upload success!";
    }
}

5. 编写jsp

upload.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <!-- 单文件上传 -->
    <form action="${pageContext.request.contextPath}/upload/file" method="post" enctype="multipart/form-data">
        文件1: <input type="file" name="uploadFile"><br/><br/>
              <input type="submit" value="上传">
    </form>
</body>
</html>

uploads.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <!-- 多文件上传 -->
    <form action="${pageContext.request.contextPath}/upload/files" method="post" enctype="multipart/form-data">
        文件1: <input type="file" name="uploadFile"><br/><br/>
        文件2: <input type="file" name="uploadFile"><br/><br/>
        文件3: <input type="file" name="uploadFile"><br/><br/>
        <input type="submit" value="上传">
    </form>
</body>
</html>

6. 查看效果

• 启动项目打开浏览器访问http://localhost:8080/upload.jsp 上传单个文件查看效果.
• 启动项目打开浏览器访问http://localhost:8080/uploads.jsp 上传多个文件查看效果.

本文地址：https://blog.csdn.net/ZY4444444/article/details/110183712