7. Spring MVC 4.1-文件上传

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在控制器参数使用@RequestParam("file") MultipartFile file接受单个文件上传;
在控制器参数使用@RequestParam("file") MultipartFile[] files接受多个文件上传;
通过配置MultipartResolver来配置文件上传的一些属性;

7.2 示例

增加和上传和文件操作的依赖到maven

<dependency>    <groupId>commons-io</groupId>    <artifactId>commons-io</artifactId>    <version>2.3</version></dependency><dependency>    <groupId>commons-fileupload</groupId>    <artifactId>commons-fileupload</artifactId>    <version>1.3.1</version></dependency>

上传控制器

package com.wisely.web;import java.io.File;import java.io.IOException;import org.apache.commons.io.FileUtils;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.multipart.MultipartFile;@Controllerpublic class UploadController {    //接受多个文件上传使用@RequestParam("file") MultipartFile[] files    @RequestMapping(value = "/upload",method = RequestMethod.POST)    public @ResponseBody String upload(@RequestParam("file") MultipartFile file) {            try {    FileUtils.writeByteArrayToFile(new File("e:/"+file.getOriginalFilename()),                                                               file.getBytes());                return "ok";            } catch (IOException e) {                e.printStackTrace();                return "wrong";            }    }}

文件上传所需配置

@Configuration@ComponentScan("com.wisely")@EnableWebMvcpublic class DemoMVCConfig extends WebMvcConfigurerAdapter {    @Bean    public UrlBasedViewResolver viewResolver(){        UrlBasedViewResolver resolver = new UrlBasedViewResolver();        resolver.setPrefix("/WEB-INF/views/")        resolver.setSuffix(".jsp");        resolver.setViewClass(JstlView.class);        return resolver;    }    //注册拦截器    @Override    public void addInterceptors(InterceptorRegistry registry) {    registry.addInterceptor(demoInteceptor());    }    //自定义拦截器    @Bean    public DemoInteceptor demoInteceptor(){        return new DemoInteceptor();    }    //静态资源映射    @Override    public void addResourceHandlers(ResourceHandlerRegistry registry) {        registry.addResourceHandler("/js/**").addResourceLocations("/js/");    }    //文件上传设置--在此处    @Bean    public MultipartResolver multipartResolver() {        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();        multipartResolver.setMaxUploadSize(1000000);        return multipartResolver;    }}

页面代码

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

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