SpringMVC文件上传的方法

本篇内容介绍了"SpringMVC文件上传的方法"的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

java配置
1. 使用springMVC自带的文件上传器

在spring mvc配置类（public class SpringMVCConfig implements WebMvcConfigurer）中添加    @Bean(name = "multipartResolver")public MultipartResolver multipartResolver() {    return new StandardServletMultipartResolver();}在web全局配置类（public class WebConfig extends AbstractAnnotationConfigDispatcherServletInitializer）中配置@Overrideprotected void customizeRegistration(ServletRegistration.Dynamic registration) {     registration.setMultipartConfig(     new MultipartConfigElement(null,30*1024*1024,100*1024*1024,0));}

2.使用第三方jar包 commons-upload

先导依赖  compile group: 'commons-fileupload', name: 'commons-fileupload', version: '1.4'在spring mvc配置类（public class SpringMVCConfig implements WebMvcConfigurer）中添加   @Bean(name = "multipartResolver")public MultipartResolver multipartResolver() {    CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();    multipartResolver.setMaxUploadSize(10*1024*1024);    return multipartResolver;}

xml配置

1. 使用springMVC自带的文件上传器

spring-mvc.xml中配置web.xml中配置   dispatcherServlet   org.springframework.web.servlet.DispatcherServlet           contextConfigLocation        classpath:spring-mvc.xml      1                                   2097152                4194304   

2.使用第三方jar包 commons-upload

先导依赖  compile group: 'commons-fileupload', name: 'commons-fileupload', version: '1.4'在spring-mvc.xml中配置   在web.xml中配置   dispatcherServlet   org.springframework.web.servlet.DispatcherServlet           contextConfigLocation        classpath:spring-mvc.xml      1

前端：form表单

......

controller方法：对传入文件使用MultipartFile类型

public String saveImage(Book book,@RequestParam("image") MultipartFile file){        if (file.getName().length()>15) return "redirect:/save.jsp";        var servlet = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();        var request = Objects.requireNonNull(servlet).getRequest();        var realpath = request.getServletContext().getRealPath("/images/");        var realFile = new File(realpath);        if (!realFile.exists())realFile.mkdirs();        try {            file.transferTo(new File(realpath, Objects.requireNonNull(file.getOriginalFilename())));        } catch (IOException e) {            e.printStackTrace();        }        service.save(book);        return "";    }

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