Spring Data提供基本的排序,如here所示。您还可以使用@Query
注释查询,并使用order by
进行排序,但我认为您需要更复杂的排序逻辑。
如果您正在使用Java 8,则可以使用其功能对列表进行排序,this文章展示了良好的示例,需要更多的工作,但似乎是您想要的。请注意,为了从流转换为列表,您必须在stream
的末尾包含.collect(Collectors.toList());
。
示例(取自文章):
employees.stream().sorted((Employee e1, Employee e2) -> e1.getHireDate()
.compareTo(e2.getHireDate())).collect(Collectors.toList());
编辑:我没有注意到您正在使用分页。我曾经遇到过类似的问题,需要在返回Page
对象之前对页面内容进行一些处理,因此最终创建了PageImpl<T>
类的扩展:
public class PageImplBean<T> extends PageImpl<T> {
private static final long serialVersionUID = 1L;
private int number;
private int size;
private int totalPages;
private int numberOfElements;
private long totalElements;
private boolean previousPage;
private boolean first;
private boolean nextPage;
private boolean last;
private List<T> content;
@JsonIgnore
private Sort sort;
public PageImplBean() {
super(new ArrayList<T>());
}
public PageImplBean(Page pagina){
super(new ArrayList<T>());
this.number = pagina.getNumber();
this.size = pagina.getSize();
this.totalPages = pagina.getTotalPages();
this.numberOfElements = pagina.getNumberOfElements();
this.totalElements = pagina.getTotalElements();
this.previousPage = pagina.hasPrevious();
this.first = pagina.isFirst();
this.nextPage = pagina.hasNext();
this.last = pagina.isLast();
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
public int getSize() {
return size;
}
public void setSize(int size) {
this.size = size;
}
public int getTotalPages() {
return totalPages;
}
public void setTotalPages(int totalPages) {
this.totalPages = totalPages;
}
public int getNumberOfElements() {
return numberOfElements;
}
public void setNumberOfElements(int numberOfElements) {
this.numberOfElements = numberOfElements;
}
public long getTotalElements() {
return totalElements;
}
public void setTotalElements(long totalElements) {
this.totalElements = totalElements;
}
public boolean isPreviousPage() {
return previousPage;
}
public void setPreviousPage(boolean previousPage) {
this.previousPage = previousPage;
}
public boolean isFirst() {
return first;
}
public void setFirst(boolean first) {
this.first = first;
}
public boolean isNextPage() {
return nextPage;
}
public void setNextPage(boolean nextPage) {
this.nextPage = nextPage;
}
public boolean isLast() {
return last;
}
public void setLast(boolean last) {
this.last = last;
}
public List<T> getContent() {
return content;
}
public void setContent(List<T> content) {
this.content = content;
}
public Sort getSort() {
return sort;
}
public void setSort(Sort sort) {
this.sort = sort;
}
public PageImpl<T> pageImpl() {
return new PageImpl<T>(getContent(), new PageRequest(getNumber(),
getSize(), getSort()), getTotalElements());
}
}
在您的情况下,重要的是
setContent
方法,在基类中不存在。您可以将其与排序方法一起使用:
PageImplBean<Thing> page =
List<Thing> pageContent = page.getContent();
page.setContent(sortByRating(pageContent));
Pageable pageable
,我的错!请修改我的答案。 - dubonzi