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>
            )