填坑之路！SpringDataJPA + Redis Page无法反序列化自定义Page类

桃扇骨 2022-02-24 05:38 289阅读 0赞

给项目加Redis缓存时候发现了Page反序列化为json时候报错了,原因是PageImpl没有空参构造器,其父类也没有,第一时间的想法是自定义反序列化,比较麻烦,后面发现许多人都是自定义Page类 但是很多都是不行的 下面给出一个我根据别人修改的自定义MyPage类

import org.springframework.data.domain.Page;
    import java.io.Serializable;
    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.Iterator;
    import java.util.List;
    
    /**
     * @Author CrazyJay
     * @Date 2019/4/3 10:53
     * @Version 1.0
     */
    public class MyPage<T> implements Iterable<T>, Serializable {
        private static final long serialVersionUID = -3720998571176536865L;
        private List<T> content = new ArrayList<>();
        private long totalElements;
        private int pageNumber;
        private int pageSize;
        private boolean first;
        private boolean last;
        private boolean empty;
        private int totalPages;
        private int numberOfElements;
    
        public MyPage() {
        }
    
        //只用把原来的page类放进来即可
        public MyPage(Page<T> page) {
            this.content = page.getContent();
            this.totalElements = page.getTotalElements();
            this.pageNumber = page.getPageable().getPageNumber();
            this.pageSize = page.getPageable().getPageSize();
            this.numberOfElements = page.getNumberOfElements();
        }
    
        //是否有前一页
        public boolean hasPrevious() {
            return getPageNumber() > 0;
        }
    
        //是否有下一页
        public boolean hasNext() {
            return getPageNumber() + 1 < getTotalPages();
        }
    
        //是否第一页
        public boolean isFirst() {
            return !hasPrevious();
        }
    
        //是否最后一页
        public boolean isLast() {
            return !hasNext();
        }
    
        //获取内容
        public List<T> getContent() {
            return Collections.unmodifiableList(content);
        }
    
        //设置内容
        public void setContent(List<T> content) {
            this.content = content;
        }
    
        //是否有内容
        public boolean hasContent() {
            return getNumberOfElements() > 0;
        }
    
        //获取单页大小
        public int getPageSize() {
            return pageSize;
        }
    
        //设置单页大小
        public void setPageSize(int pageSize) {
            this.pageSize = pageSize;
        }
    
        //获取全部元素数目
        public long getTotalElements() {
            return totalElements;
        }
    
        //设置全部元素数目
        public void setTotalElements(long totalElements) {
            this.totalElements = totalElements;
        }
    
        //设置是否第一页
        public void setFirst(boolean first) {
            this.first = first;
        }
    
        // 设置是否最后一页
        public void setLast(boolean last) {
            this.last = last;
        }
    
        //获取当前页号
        public int getPageNumber() {
            return pageNumber;
        }
    
        //设置当前页号
        public void setPageNumber(int pageNumber) {
            this.pageNumber = pageNumber;
        }
    
        //获取总页数
        public int getTotalPages() {
            return getPageSize() == 0 ? 1 : (int) Math.ceil((double) totalElements / (double) getPageSize());
        }
    
        //设置总页数
        public void setTotalPages(int totalPages) {
            this.totalPages = totalPages;
        }
    
        //获取单页元素数目
        public int getNumberOfElements() {
            return numberOfElements;
        }
    
        //设置单页元素数目
        public void setNumberOfElements(int numberOfElements) {
            this.numberOfElements = numberOfElements;
        }
    
        //判断是否为空
        public boolean isEmpty() {
            return !hasContent();
        }
    
        //设置是否为空
        public void setEmpty(boolean empty) {
            this.empty = empty;
        }
    
        //迭代器
        @Override
        public Iterator<T> iterator() {
            return getContent().iterator();
        }
    }