本文基于注解的配置，敬请留意 基于注解整合
一。springmvc为我们提供两种上传方式配置：
1）org.springframework.web.multipart.commons.CommonsMultipartResolver （基于commons-fileupload.jar）
2) org.springframework.web.multipart.support.StandardServletMultipartResolver （基于servlet3.0+）
二。配置方式基于commons-fileupload.jar
1）在先前的类DispacherConfig里添加如下代码：
1 /** 2 * 此处注意bean的名字一定起名为multipartResolver 3 * @return 4 */ 5 @Bean 6 public CommonsMultipartResolver multipartResolver() { 7 CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver(); 8 commonsMultipartResolver.setDefaultEncoding(propertyConfig.getUploadDefaultEncoding()); 9 commonsMultipartResolver.setMaxUploadSize(1024 * 1024 * propertyConfig.getMaxUploadSize());//字节为单位 10 return commonsMultipartResolver; 11 }
注意bean的名字一定为：multipartResolver，贼恶心，曾经起别的名字死活报错
2）在先前的application.properties添加如下代码：
#注意以兆为单位 spring.web.max.upload.size=30 spring.web.fileupload.encoding=utf-8
3）更改propertyConfig类添加对应的属性：
@Value("${spring.web.max.upload.size}")
private Integer maxUploadSize;
@Value("${spring.web.fileupload.encoding}")
private String uploadDefaultEncoding="utf-8";
public String getUploadDefaultEncoding() {
return uploadDefaultEncoding;
}
public Integer getMaxUploadSize() {
return maxUploadSize;
}
三。配置方式基于servlet3.0+
此时我们需要在MyWebAppInitializer里重写 customizeRegistration 方法
1 /** 2 * servlet3.0+ 上传文件 3 * 单个文件最大5M 4 * 总请求最大20M 5 * @param registration 6 */ 7 @Override 8 protected void customizeRegistration(ServletRegistration.Dynamic registration) { 9 String temp = System.getProperty("java.io.tmp"); 10 MultipartConfigElement multipartConfigElement = new MultipartConfigElement(temp, 5242880, 20971520, 0); 11 registration.setMultipartConfig(multipartConfigElement); 12 }
在DispacherConfig里添加如下bean
1 @Bean 2 public MultipartResolver multipartResolver() { 3 StandardServletMultipartResolver standardServletMultipartResolver = new StandardServletMultipartResolver(); 4 return standardServletMultipartResolver; 5 }
注意bean的名字一定为:multipartResolver
如果您想通过配置实现，则需在web.xml里配置代码:
1 <servlet> 2 <servlet-name>dispatcher</servlet-name> 3 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 4 <load-on-startup>1</load-on-startup> 5 <multipart-config> 6 <file-size-threshold>0</file-size-threshold> 7 <location>c:/tmp</location> 8 <max-file-size>2000000</max-file-size> 9 <max-request-size>40000000</max-request-size> 10 </multipart-config> 11 </servlet> 12 <servlet-mapping> 13 <servlet-name>dispatcher</servlet-name> 14 <url-pattern>*.form</url-pattern> 15 </servlet-mapping>
同样需要在spring-bean里的配置：
1 <bean id="multipartResolver" 2 class="org.springframework.web.multipart.support.StandardServletMultipartResolver"> 3 </bean>
四。在controller中实现文件上传
创建控制器UploadController并写相关上传代码:
1 @PostMapping("/upload") 2 public String upload(@RequestParam(name = "file")MultipartFile file) throws IOException { 3 System.out.println(file.getOriginalFilename());//获取文件名 4 FilenameUtils.getExtension(file.getOriginalFilename());//获取文件类型 5 /* 6 省略拼接文件地址代码 7 。。。 8 */ 9 file.transferTo(new File("上传目标文件地址")); 10 11 return "uploadSuccess"; 12 }
