6.9.2、改变默认的_method

@Configuration(proxyBeanMethods = false)
@ConditionalOnWebApplication(type = Type.SERVLET)
@ConditionalOnClass({ Servlet.class, DispatcherServlet.class, WebMvcConfigurer.class })
@ConditionalOnMissingBean(WebMvcConfigurationSupport.class)
@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE + 10)
@AutoConfigureAfter({ DispatcherServletAutoConfiguration.class, TaskExecutionAutoConfiguration.class,
        ValidationAutoConfiguration.class })
public class WebMvcAutoConfiguration {
    ...
    @Bean
    @ConditionalOnMissingBean(HiddenHttpMethodFilter.class)
    @ConditionalOnProperty(prefix = "spring.mvc.hiddenmethod.filter", name = "enabled", matchIfMissing = false)
    public OrderedHiddenHttpMethodFilter hiddenHttpMethodFilter() {
        return new OrderedHiddenHttpMethodFilter();
    }
    ...
}

1、@ConditionalOnMissingBean(HiddenHttpMethodFilter.class)意味着在没有HiddenHttpMethodFilter 时，才执行hiddenHttpMethodFilter()。因此，我们可以自定义filter，改变默认的 _method。例如：

• 将_method改成_m。 ```java @Configuration(proxyBeanMethods = false) public class WebConfig{ //自定义filter @Bean public HiddenHttpMethodFilter hiddenHttpMethodFilter(){

    HiddenHttpMethodFilter methodFilter = new HiddenHttpMethodFilter();
    methodFilter.setMethodParam("_m");
    return methodFilter;
  

  }
  }

```

2、表单隐藏域的name属性的值：