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SpringMVC上传文件的两种方法

2019-11-26 10:53:44
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在该示例中,阐述了SpringMVC如何上传文件。
1、上传页面upload.jsp

<body>   <form action="/TestSpringMVC3/data/uploadfile" enctype="multipart/form-data" method="post">     file:<input type="file" name="file"><br>     <input type="submit" value="upload file">   </form> </body> 

2、controller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:p="http://www.springframework.org/schema/p"     xmlns:context="http://www.springframework.org/schema/context"     xmlns:aop="http://www.springframework.org/schema/aop"     xmlns:tx="http://www.springframework.org/schema/tx"     xsi:schemaLocation="http://www.springframework.org/schema/beans       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd       http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context-3.0.xsd       http://www.springframework.org/schema/aop        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd       http://www.springframework.org/schema/tx        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd       http://www.springframework.org/schema/mvc        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd       http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context-3.0.xsd">   <!--     使Spring支持自动检测组件,如注解的Controller   -->   <context:component-scan base-package="cn.com.yy.controller"/>      <!-- 开启注解配置 -->   <mvc:annotation-driven/>        <!-- 支持JSP JSTL的解析器 -->   <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">     <property name="prefix" value="/WEB-INF/page/"/>     <property name="suffix" value=".jsp"/>    </bean>        <!-- 配置文件上传解析器 -->    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">     <property name="defaultEncoding" value="utf-8"/>     <property name="maxUploadSize" value="10485760000"/>     <property name="maxInMemorySize" value="40960"/>    </bean> </beans> 

主要是添加了文件上传的解析器,配置了默认编码,最大的上传大小以及缓存大小等参数。

3、Controller

package cn.com.yy.controller;  import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream;  import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.commons.CommonsMultipartFile;  @Controller @RequestMapping("/data") public class FileUploadController {      /**    * method1:通过参数CommonsMultipartFile进行解析    * @RequestParam("file")中的file对应于upload.jsp中的file类型的name对应的名称    * @param file    * @return    * @throws IOException    */   @RequestMapping(value="/uploadfile")   public String upload1(@RequestParam("file") CommonsMultipartFile file) throws IOException{     //获取文件名称     String fileName = file.getOriginalFilename();     //写入本地磁盘     InputStream is = file.getInputStream();     byte[] bs = new byte[1024];     int len;     OutputStream os = new FileOutputStream(new File("D:/temp/" + fileName));     while ((len = is.read(bs)) != -1) {       os.write(bs, 0, len);     }     os.close();     is.close();     return "upload_success";   }      @RequestMapping("/upload")   public String toPage(){     return "upload";   } } 

4、返回页面upload_success.jsp

<body>   upload file success!! </body> 

5、测试

访问  http://localhost:8080/TestSpringMVC3/data/upload  跳转到上传页面

    

选择文件上传

                    

点击上传会跳转到上传成功页面。

上述方法只是简单的讲解了SpringMVC如何上传文件。    

第二种方法:使用SpringMVC封装的方法进行文件上传

/**    * 使用SpringMVC封装好的方法进行文件上传    * @param request    * @param response    * @throws IllegalStateException    * @throws IOException    */   @RequestMapping("/uploadfile2")   public void upload2(HttpServletRequest request,HttpServletResponse response) throws IllegalStateException, IOException{     //获取解析器     CommonsMultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext());     //判断是否是文件     if(resolver.isMultipart(request)){       //进行转换       MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)(request);       //获取所有文件名称       Iterator<String> it = multiRequest.getFileNames();       while(it.hasNext()){         //根据文件名称取文件         MultipartFile file = multiRequest.getFile(it.next());         String fileName = file.getOriginalFilename();         String localPath = "D:/temp/" + fileName;         File newFile = new File(localPath);         //上传的文件写入到指定的文件中         file.transferTo(newFile);       }     }   } 

该方法上传文件效率更优。

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持武林网。

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