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  • springMVC实现文件上传下载

    上传文件和下载文件是个常用的技能,在哪里开发几乎都能遇见,而所有的上传控件各不相同,插件很多,后台也有很多,这里我只尝试过这个方法觉的还够简洁。具体如下实现:

    1、spring-mvc.xml配置  添加如下,下划线的是关键

    <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:mvc="http://www.springframework.org/schema/mvc"
           xmlns:aop="http://www.springframework.org/schema/aop"
           xmlns:websocket="http://www.springframework.org/schema/websocket"
           xsi:schemaLocation="
           http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
            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/websocket http://www.springframework.org/schema/websocket/spring-websocket.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
    
        <!-- 自动扫描且只扫描@Controller -->
        <context:component-scan base-package="com.oasis.wyvern" use-default-filters="false">
            <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
            <context:include-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/>
        </context:component-scan>
        <context:annotation-config/>
        <context:component-scan base-package="com.oasis.wyvern.res.controller"/>
        <bean id="ignorTypeInfoJacksonAnnotationIntrospector" class="com.oasis.wyvern.res.utils.jackson.JsonMapper.IgnorTypeInfoJacksonAnnotationIntrospector">
        </bean>
    
        <mvc:annotation-driven>
            <mvc:message-converters register-defaults="true">
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                    <property name="objectMapper">
                        <bean class="com.fasterxml.jackson.databind.ObjectMapper">
                            <property name="serializationInclusion">
                                <value type="com.fasterxml.jackson.annotation.JsonInclude.Include">NON_NULL</value>
                            </property>
                            <property name="annotationIntrospector" ref="ignorTypeInfoJacksonAnnotationIntrospector"/>
                        </bean>
                    </property>
                </bean>
            </mvc:message-converters>
        </mvc:annotation-driven>
    
        <!--websocket 配置-->
        <bean id="websocket" class="com.oasis.wyvern.res.controller.websocket.WebsocketEndPoint"/>
        <websocket:handlers  allowed-origins="*">
            <websocket:mapping path="/websocket" handler="websocket"/>
            <websocket:handshake-interceptors>
                <bean class="com.oasis.wyvern.res.controller.websocket.HandshakeInterceptor"/>
            </websocket:handshake-interceptors>
        </websocket:handlers>
    
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/views/"/>
            <property name="suffix" value=".jsp"/>
        </bean>
    
        <!-- 上传文件拦截,设置最大上传文件大小   10M=10*1024*1024(B)=10485760 bytes -->
        <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
            <property name="defaultEncoding" value="UTF-8" />
            <property name="maxUploadSize" value="104857600"/>
            <property name="maxInMemorySize" value="4096"/>
        </bean>
    
        <!-- 处理所有的无RequestMapping和静态内容的URL -->
        <mvc:default-servlet-handler/>
        <!-- 定义无需Controller的url<->view直接映射 -->
        <mvc:view-controller path="/core/404" view-name="/core/404"/>
        <mvc:view-controller path="/core/refresh" view-name="/core/refresh"/>
        <mvc:view-controller path="/core/error" view-name="/core/error"/>
    
        <!--<mvc:interceptors>
            <mvc:interceptor>
                <mvc:mapping path="/**"/>
                <bean class="com.oasis.crm.controller.ziwei.core.formtoken.FormTokenInterceptor"/>
            </mvc:interceptor>
        </mvc:interceptors>-->
    
        <!-- Shiro 注解AOP -->
        <!-- Enable Shiro Annotations for Spring-configured beans.  Only run after -->
        <!-- the lifecycleBeanProcessor has run: -->
        <aop:aspectj-autoproxy proxy-target-class="true"></aop:aspectj-autoproxy>
        <bean class="org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor">
            <property name="securityManager" ref="securityManager"/>
        </bean>
    
    </beans>

    2、controller上传      

        /**
         * 创建文件
         * @return
         */
        @RequestMapping(CREATE)  //ajax请求的url
        @ResponseBody
        public PackVo<Boolean> createAttachment(MultipartFile file ){
            String uuid = UuidUtils.getUUID();
            attachmentService.createAttachment(file,uuid);
            PackVo<Boolean> packVo = new PackVo<>();
            packVo.setVo(Boolean.TRUE);
            packVo.setUdf2(uuid);
            return packVo;    //controller返回值可看配置  可直接换为String
        }

    3、文件上传后处理保存在服务器,或hbase

      private Attachment generateAttachment(MultipartFile file, String uuid) throws IllegalStateException, IOException {
            Calendar calendar = Calendar.getInstance();
            String toMonth = DateUtil.dateFormat(calendar.getTime(), "yyyyMM");
            String toDay = DateUtil.dateFormat(calendar.getTime(), "yyyyMMdd");
            toDay = toDay.substring(6);
            String path = "d:/attachment/" + toMonth + "/" + toDay + "/";
            String myFileName = file.getOriginalFilename();
         //   String noPostfixFileName =  myFileName.substring(0,myFileName.indexOf("."));
            FileManageUtil.makeDirectory(path);
            path += myFileName;
            File localFile = new File(path);
            file.transferTo(localFile);
            Attachment attachment = new Attachment();
            attachment.setName(myFileName);
            attachment.setAttachmentUrl(path);
            attachment.setFileSize(Float.parseFloat(file.getSize()+""));
            attachment.setUuid(uuid);
            return attachment;
    
        }

    二、1、文件下载

      @RequestMapping(value=DOWNLOAD)
        public ResponseEntity<byte[]> testResponseEntity(String realName,String path) throws IOException {
            byte[] body = null;
            File f = new File(path);
            InputStream in = new FileInputStream(f);
            body = new byte[in.available()];
            in.read(body);
            in.close();
            HttpHeaders headers = new HttpHeaders();
            //响应头的名字和响应头的值
            headers.add("Content-Disposition", "attachment;filename="+new String(realName.getBytes("UTF-8"),"iso-8859-1"));//解决文名称中文乱码
            HttpStatus statusCode = HttpStatus.OK;
            ResponseEntity<byte[]> response = new ResponseEntity<byte[]>(body, headers, statusCode);
            return response;
    }

    2、前台实现下载,上传就略去了,reactjs写法

      return (
                    <div>
                        {
                            this.state.initialObj.attachmentVoList.map((attachment)=> {
                                return (
                                    <div key={attachment.id} className="attachment-list">
                                        <a>{attachment.name} </a>&nbsp;&nbsp;&nbsp;
                                        <a  href={Remote.cert.download+'?path='+attachment.attachmentUrl+'&realName='+attachment.name} >下载 </a>
                                        <span className="ant-divider" />
                                        <Popconfirm title="您确定删除吗?" onConfirm={this.deleteData.bind(this, attachment.id)}>
                                            <a >删除</a>
                                        </Popconfirm>
                                    </div>
                                )
                            })
                        }
    
                    </div>
                )
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  • 原文地址:https://www.cnblogs.com/likun10579/p/6069724.html
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