7. Spring MVC 4.1-文件上传

@RequestParam("file") MultipartFile file

@RequestParam("file") MultipartFile[] files

MultipartResolver

7.2 示例

<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>

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;

@Controller
public 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";
}
}
}

@Configuration
@ComponentScan("com.wisely")
@EnableWebMvc
public 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;
}
}

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