springmvc 之文件上传

新建web项目
导入 jar 包，文件上传需要导入 commons-io, commons-fieupload.

配置 web.xml

<!-- springmvc前端控制器配置 -->
  <servlet>
      <servlet-name>mvc</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:mvc.xml</param-value>
      </init-param>
      <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
      <servlet-name>mvc</servlet-name>
      <url-pattern>*.do</url-pattern>
  </servlet-mapping>

注意：servlet-mapping如果为 / 时，要拦截所要的请求。

编写文件上传处理器

@Controller
public class FileUploadController {
    @RequestMapping("/upload")
    public String fileupload(@RequestParam("file")CommonsMultipartFile file,HttpServletRequest req){
        String path = req.getRealPath("/upload");
        //获取原始文件名
        String fileName = file.getOriginalFilename();
        try {
            InputStream is = file.getInputStream();
            OutputStream os = new FileOutputStream(new File(path,fileName));
            byte[] buffer = new byte[400];
            int len=0;
            while((len=is.read(buffer))!=-1)
                os.write(buffer, 0, len);
            os.close();
            is.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "forward:/success.jsp";
    }
}

编写 springmvc配置文件，需要配置MultipartResolver

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    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/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!-- 多媒体解析器 -->
    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="100000000"/>
    </bean>
    <mvc:annotation-driven/>
    <context:component-scan base-package="cn.wh.controller"/>
</beans>

编写 jsp 页面

<form action="upload.do" method="post" enctype="multipart/form-data">
       文件:<input type="file" name="file"/><input type="submit" value="上传"/>
   </form>

请求路径不能和上传的目录一致

springmvc 之 文件上传

springmvc 之文件上传