Spring boot 分页方法过时解决

清疚 2023-02-18 15:19 21阅读 0赞

# 1.问题表现 #

源代码为：

Sort sort = new Sort(Sort.Direction.DESC, "login_time");
    Pageable pageable = new PageRequest(Integer.parseInt(page), Integer.parseInt(size), sort);

报错代码为：

'Sort(org.springframework.data.domain.Sort.Direction,java.util.List<java.lang.String>)' has private access in 'org.springframework.data.domain.Sort'
    
    PageRequest(int, int, org.springframework.data.domain.Sort)' has protected access in 'org.springframework.data.domain.PageRequest

# 2.问题分析 #

很明显，Spring Boot新版本中已经升级相关的类，不支持原来的写法了。

以Sort为例，我们看一下他的源码：

public class Sort implements Streamable<Sort.Order>, Serializable {
        private static final long serialVersionUID = 5737186511678863905L;
        private static final Sort UNSORTED = by();
        public static final Sort.Direction DEFAULT_DIRECTION;
        private final List<Sort.Order> orders;
    
        private Sort(Sort.Direction direction, List<String> properties) {
            if (properties != null && !properties.isEmpty()) {
                this.orders = (List)properties.stream().map((it) -> {
                    return new Sort.Order(direction, it);
                }).collect(Collectors.toList());
            } else {
                throw new IllegalArgumentException("You have to provide at least one property to sort by!");
            }
        }
    
        public static Sort by(String... properties) {
            Assert.notNull(properties, "Properties must not be null!");
            return properties.length == 0 ? unsorted() : new Sort(DEFAULT_DIRECTION, Arrays.asList(properties));
        }
    
        public static Sort by(List<Sort.Order> orders) {
            Assert.notNull(orders, "Orders must not be null!");
            return orders.isEmpty() ? unsorted() : new Sort(orders);
        }
    
        public static Sort by(Sort.Order... orders) {
            Assert.notNull(orders, "Orders must not be null!");
            return new Sort(Arrays.asList(orders));
        }
    
        public static Sort by(Sort.Direction direction, String... properties) {
            Assert.notNull(direction, "Direction must not be null!");
            Assert.notNull(properties, "Properties must not be null!");
            Assert.isTrue(properties.length > 0, "At least one property must be given!");
            return by((List)Arrays.stream(properties).map((it) -> {
                return new Sort.Order(direction, it);
            }).collect(Collectors.toList()));
        }

这里Sort的属性已有原来的public变为private了，而且我们原来的方法变更为Sort.by()

同理，PageRequest的原有的属性由public变为procted

# 3.解决方案 #

按照新版本源码提供的方案修改即可：

Sort sort = Sort.by(Sort.Order.desc("create_date"));
    Pageable pageable =PageRequest.of(Integer.parseInt(page), Integer.parseInt(size), sort);