SpringMVC上传文件(单个文件、多个文件)

SpringMVC中通过CommonsMultipartResolver实现文件上传，可以上传单个或者多个文件。

HTML上传页面：

        <h1>文件上传</h1>
	<form action="/pic/doUpload" method="post" enctype="multipart/form-data">
		<input type="file" name="files"/>
		<input type="submit"/>
	</form>

导入依赖：Commons-fileupload, 它依赖的Commons-io会自动导入

<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
<dependency>
	<groupId>commons-fileupload</groupId>
	<artifactId>commons-fileupload</artifactId>
	<version>1.3.3</version>
</dependency>

在SpringMVC.xml文件中配置上传文件的类CommonsMultipartResolver

        <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="maxUploadSize" value="209715200"/>
		<property name="defaultEncoding" value="UTF-8"/>
		<!-- 200*1024*1024即200M，resolverLazily属性启用是为了推迟文件解析，以便捕获文件大小异常 -->
		<property name="resolveLazily" value="true"/>
	</bean>

在Controller中配置视图映射路径

@Controller
@RequestMapping("/pic")
public class PicUpload{
    @RequestMapping(value="/doUpload", method=RequestMapping.POST)
    //单文件上传只需要把MultipartFile[]数组换成MultipartFile单个对象即可
    //如:public String uploadFile(@RequestParam("files") MultipartFile files)
    public String uploadFile(@RequestParam("files") MultipartFile[] files)throws Exception{
        if(files.length < 1)
            return "error";
        for(MultipartFile file : files)
            saveFile(file);
        return "success";
    }

    public void saveFile(MultipartFile file) throws Exception
    {
        FileUtils.copeInputStreamToFile(file.getInputStream(), new File("D:/temp/pics/"+file.getOriginalFilename()));
    }
}