java – Spring Data JPA – JpaRepository中的自定义排序

如果您使用的是Java 8,您可以使用它的功能对列表进行排序,this文章显示了很好的例子,它需要更多的工作,但看起来就像您所追求的那样.请注意,要从流转换为列表,您必须包含.collect(Collectors.toList());在流的最后.

示例(摘自文章)：

employees.stream().sorted((Employee e1,Employee e2) -> e1.getHireDate()
                        .compareTo(e2.getHireDate())).collect(Collectors.toList());

编辑：我没注意到你正在使用分页.我有一个类似的问题,我必须在返回Page对象之前对页面内容做一些事情,所以我最终创建了PageImpl< T>的扩展了.类：

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());
    }
}

在你的情况下,重要的是setContent方法,它不存在于基类中.您可以将它与您的排序方法一起使用：

PageImplBean<Thing> page = //call your rest repository
List<Thing> pageContent = page.getContent();
page.setContent(sortByRating(pageContent));