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
@Override
protected 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
<bean id="multipartResolver" class="org.springframework.web.multipart.support.StandardServletMultipartResolver"/>
web.xml中配置
<!--配置处理器分发器、文件上传器-->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
<multipart-config>
<!--临时文件的目录: 不存放临时文件-->
<location></location>
<!-- 上传文件最大2M -->
<max-file-size>2097152</max-file-size>
<!-- 上传文件整个请求不超过4M -->
<max-request-size>4194304</max-request-size>
</multipart-config>
</servlet>
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
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="31457280"/>
</bean>
在web.xml中配置
<!--配置处理器分发器、文件上传器-->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
前端:form表单
<form method="post" action="" enctype="multipart/form-data">
......
</form>
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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原文链接:https://my.oschina.net/u/4134962/blog/3073571