Question

我需要为每个private static final Sort sortById = new Sort(Sort.Direction.DESC, ID);添加Pageable。我想，最好的方法是为SortArgumentResolver创建装饰器/适配器。

我创建了课程：

public class IdSortArgumentResolver implements SortArgumentResolver {

private static final String ID = "id";
private static final Sort sortById = new Sort(Sort.Direction.DESC, ID);
private final SortArgumentResolver delegate;

public IdSortArgumentResolverAdapter(SortArgumentResolver delegate) {
    this.delegate = delegate;
}

@Override
public boolean supportsParameter(MethodParameter methodParameter) {
    return delegate.supportsParameter(methodParameter);
}

@Override
public Sort resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) {
    Sort sort = delegate.resolveArgument(parameter, mavContainer, webRequest, binderFactory);
    if (isNull(sort)) {
        return sortById;
    }
    if (containsSortById(sort)) {
        return sort;
    }
    return sort.and(sortById);
}

private static boolean containsSortById(Sort currentSort) {
    return StreamSupport.stream(currentSort.spliterator(), false)
                        .anyMatch(order -> ID.equalsIgnoreCase(order.getProperty()));
}

}

如何将默认SortArgumentResolver更改为IdSortArgumentResolver？可能吗？或者有更好的方法来做到这一点......

在spring-boot 1.5.2 RELEASE

中配置了SortHandlerMethodArgumentResolver和当前SpringDataWebConfiguration

Answer 1

注意：在您的帖子中，您的班级名称为IdSortArgumentResolverAdapter，但您的构造函数为WebMvcConfigurerAdapter。

创建一个扩展@Configuration public class WebMvcConfiguration extends WebMvcConfigurerAdapter { // ... }的配置类：

addArgumentResolvers

覆盖Sort方法并配置您的Pageable和@Override public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) { // FIXME Replace null with what you want SortArgumentResolver sortResolver = new IdSortArgumentResolver(null); // For sorting resolution alone argumentResolver.add(sortResolver); PageableHandlerMethodArgumentResolver pageableResolver = new PageableHandlerMethodArgumentResolver(sortResolver); // For sorting resolution encapsulated inside a pageable argumentResolver.add(pageableResolver); }解析器：

@Override
public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
    SortHandlerMethodArgumentResolver sortResolver = new SortHandlerMethodArgumentResolver();

    sortResolver.setFallbackSort(new Sort(Sort.Direction.DESC, "id"));

    // For sorting resolution alone
    argumentResolver.add(sortResolver);

    PageableHandlerMethodArgumentResolver pageableResolver = new PageableHandlerMethodArgumentResolver(sortResolver);

    // For sorting resolution encapsulated inside a pageable
    argumentResolver.add(pageableResolver);
}

没有自定义类的

更好的解决方案：

jQuery.each(titles, function( index, value ) {
   $("#title").fadeIn(200).delay(500).fadeOut(200, function() {
               $("#title").text(value);
    });
});

Answer 2

从spring-data-commons版本2.0开始，有2个新类可以让这种事情变得更容易：

SortHandlerMethodArgumentResolverCustomizer
PageableHandlerMethodArgumentResolverCustomizer

不幸的是，这不是当前版本的Spring Boot随附的版本，因此请自行承担风险。

@Bean SortHandlerMethodArgumentResolverCustomizer sortCustomizer() {
    // s is SortHandlerMethodArgumentResolver
    return s -> s.setPropertyDelimiter("<-->");
}

在这种情况下，可能会调用resolveArgument来操纵它。

Spring Data Web Support

Answer 3

对于春季靴2.2.1发布：

@Configuration
public class LocaleConfiguration implements WebMvcConfigurer {
    @Override
    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> resolvers) {
        SortHandlerMethodArgumentResolver sortArgumentResolver = new SortHandlerMethodArgumentResolver();
        Sort defaultSort = Sort.by(new Sort.Order(Sort.Direction.DESC, "id"));
        sortArgumentResolver.setFallbackSort(defaultSort);

        PageableHandlerMethodArgumentResolver resolver = new PageableHandlerMethodArgumentResolver(sortArgumentResolver);
        resolver.setOneIndexedParameters(true);
        resolver.setMaxPageSize(20);
        resolvers.add(resolver);
    }
}

如何替换默认的SortArgumentResolver

3 个答案: