文件上传与下载--springmvc版本上传_springmvc5.2版本需要下载什么版本的上传下载jar-优快云博客

本文链接：https://blog.youkuaiyun.com/csdnindex/article/details/73471072

前言：使用spring、springmvc整合的web项目，maven添加jar包依赖

1、依赖jar包配置，可手工导入进项目
jar包

2、spring、springmvc配置文件
applicationContext.xml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:context="http://www.springframework.org/schema/context"
       xmlns:task="http://www.springframework.org/schema/task"
       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/task http://www.springframework.org/schema/task/spring-task-4.1.xsd">

    <!-- 开启自动扫包 spring无需关注@Controller注解的JAVA类-->
    <context:component-scan base-package="test.service">

    </context:component-scan>
    <!-- 定时任务注解开启-->
    <task:annotation-driven />
</beans>

springmvc.xml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"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!-- 配置springmvc要扫描的注解-->
    <context:component-scan base-package="test.controller" use-default-filters="false">
        <!-- 配置白名单 -->
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    <!-- 启动AOP支持 激活自动代理功能 -->
    <aop:aspectj-autoproxy/>

    <context:annotation-config/>


    <mvc:annotation-driven>
        <mvc:message-converters register-defaults="true">
            <!-- 将StringHttpMessageConverter的默认编码设为UTF-8 -->
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <constructor-arg value="UTF-8" />
            </bean>

            <!-- 启用fastjson的json格式化输出、日期格式化输出 -->
            <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>application/json;charset=UTF-8</value>
                    </list>
                </property>
                <property name="features">
                    <array>
                        <value>WriteMapNullValue</value>
                        <value>QuoteFieldNames</value>
                        <value>WriteDateUseDateFormat</value>
                        <value>WriteNullStringAsEmpty</value>
                    </array>
                </property>
            </bean>

        </mvc:message-converters>
    </mvc:annotation-driven>

    <!-- 配置JSP视图 -->
     <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
       <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/"/>
        <property name="suffix" value=".jsp"/>     
        <property name="contentType" value="text/html;charset=UTF-8"/>
        <property name="order" value="1"/>
     </bean>

    <!-- 配置文件上传-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="utf-8" />
        <property name="maxUploadSize" value="209715200" />
        <property name="resolveLazily" value="true" />
        <property name="maxInMemorySize" value="4096" />
    </bean>

</beans>

3、web.xml配置文件

 <!-- 声明应用范围(整个WEB项目)内的上下文初始化参数 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring/applicationContext.xml</param-value>
  </context-param>
    <context-param>
        <param-name>webAppRootKey</param-name>
        <param-value>test.root</param-value>
    </context-param>
    <!-- 编码过滤 -->
    <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>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!-- spring容器监听 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!-- request监听 -->
    <listener>
        <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
    </listener>

    <!-- springmvc Servlet -->
    <servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/springmvc.xml</param-value>
        </init-param>
    </servlet>
        <!--使用spring进行拦截所有请求-->
    <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>*.shtml</url-pattern>
    </servlet-mapping>

4、上传controller

@Controller
public class UploadController {
    @Autowired
    private UploadService uploadService;

    @RequestMapping(value="/file/uplaod",method=RequestMethod.POST)
    public String uploadFile(ModelMap model,MultipartFile file){
        uploadService.uploadFile(file);
        System.out.println("进入"+file.getOriginalFilename());
        model.put("message", "上传成功");
        return "common/message";
    }
    @RequestMapping(value="/filemulti/uplaod")
    public String uploadMultiFile(ModelMap model,@RequestParam("files")MultipartFile[] files){
        uploadService.uploadMultiFile(files);

        model.put("message", "上传成功");
        return "common/message";
    }

}

5、上传service

@Service
public class UploadService {

    public void uploadFile(MultipartFile file){
        //this.getClass().getClassLoader().getResource("/").getPath(); 
            String basePath = "D:/upload/";
            File pathFile = new File(basePath);
            if(!pathFile.exists()){
                pathFile.mkdir();
            }
         // 判断文件是否为空  
        if (!file.isEmpty()) {  
            try {  
                // 文件保存路径  
                String filePath =  basePath+file.getOriginalFilename();  

                // 转存文件  
                file.transferTo(new File(filePath));  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
    }
    public void uploadMultiFile(MultipartFile[] files){
         //判断file数组不能为空并且长度大于0  
        if(files!=null&&files.length>0){  
            //循环获取file数组中得文件  
            for(int i = 0;i<files.length;i++){  
                MultipartFile file = files[i];  
                //保存文件  
                uploadFile(file);  
            }  
        }  
    }
}

结语：

文件上传重要配置：
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="utf-8" />
        <property name="maxUploadSize" value="209715200" />
        <property name="resolveLazily" value="true" />
        <property name="maxInMemorySize" value="4096" />
    </bean>