SpringMVC 两种上传文件方法

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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/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsdhttp://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。

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