文件上传

springMVc.xml 中配置

<context:component-scan base-package="com.spring.mvc" />
<!--开启注解的配置-->
<mvc:annotation-driven></mvc:annotation-driven>
<!--进行配置视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <!--前缀,页面从什么地方开始获取-->
    <property name="prefix" value="/"></property>
    <!--后缀，页面.结合名称-->
    <property name="suffix" value=".jsp"></property>
</bean>
<mvc:default-servlet-handler/>
<!--文件的配置-->

  <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
      <!--配置字符集-->
      <property name="defaultEncoding" value="utf-8"></property>
      <!--一次上传总大小 的文件-->
       <property name="maxUploadSize" value="987659994"></property>
      <!--每个文件的大小-->
       <property name="maxUploadSizePerFile" value="#{1024*1024}"></property>
      <!--设置阀值 -->
        <property name="maxInMemorySize" value="#{1024*1024*2}"></property>
  </bean>

controller 层代码 业务逻辑

@Controller
public class TestController {

@RequestMapping("/getUpload")
@ResponseBody
public  String[]  getUpload(@RequestParam("file")MultipartFile  file,
                            HttpServletRequest  request
                            ) throws IOException {

 //定义文件文件名
      String  fileName="";
      //1.获取原生文件名称
    String uploadFilename = file.getOriginalFilename();
     //2.进行获取文件名称后缀
    //XX.XX.jsp
     String  extendName=uploadFilename.substring
             (uploadFilename.lastIndexOf(".")-1,uploadFilename.length());
    //进行判断
    //是否值jpg,png,jpeg
     //3.防止图片名称相同
   String  uuid= UUID.randomUUID().toString().replace("-","").toUpperCase();
        //文件的名称
    fileName=uuid+extendName;//新文件名称
    System.out.println("文件的名称:"+fileName);


     //4.获取文件路径地址
    ServletContext servletContext = request.getServletContext();

    String uploads = servletContext.getRealPath("/uploads");
    System.out.println("文件存放的路径：" + uploads);
    //处理文件比较多
    String format = new SimpleDateFormat("yyyy-MM-dd").format(new Date());
    File file1 = new File(uploads + "/" + format);
    if(!file1.exists()){
        System.out.println("--------------------");
        file1.mkdirs();
    }
    //5.进行将文件写到对应位置
    file.transferTo(new File(file1,fileName));
    return   new  String[]{"uploads/"+format+"/"+fileName};
}

}