JSON parse error: Can not construct instance of org.springframework.data.domain.Page:

末蓝、 2022-05-15 06:56 1298阅读 0赞

org.springframework.data.domain.Page:转换异常报错，解决方法，缺少实现类

JSON parse error: Can not construct instance of org.springframework.data.domain.Page:
     abstract types either need to be mapped to concrete types, have custom deserializer, or
     contain additional type information; nested exception is 
    com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of 
    org.springframework.data.domain.Page: abstract types either need to be mapped to 
    concrete types, have custom deserializer, or contain additional type information at 
    [Source: java.io.PushbackInputStream@c793cf1; line: 1, column: 1]

package com.lenovo.chinaservice.pscm.iwm.utils;
    import org.springframework.core.convert.converter.Converter;
    import org.springframework.data.domain.Page;
    import org.springframework.data.domain.PageImpl;
    import org.springframework.data.domain.Pageable;
    import org.springframework.data.domain.Sort;
    
    import java.util.ArrayList;
    import java.util.Iterator;
    import java.util.List;
    
    public class RestPage<T> implements Page<T> {
        private PageImpl<T> pageDelegate = new PageImpl<>(new ArrayList<>(0));
    
        @Override
        public List<T> getContent() {
            return pageDelegate.getContent();
        }
    
        @Override
        public int getNumber() {
            return pageDelegate.getNumber();
        }
    
        @Override
        public int getNumberOfElements() {
            return pageDelegate.getNumberOfElements();
        }
    
        @Override
        public int getSize() {
            return pageDelegate.getSize();
        }
    
        @Override
        public Sort getSort() {
            return pageDelegate.getSort();
        }
    
        @Override
        public long getTotalElements() {
            return pageDelegate.getTotalElements();
        }
    
        @Override
        public int getTotalPages() {
            return pageDelegate.getTotalPages();
        }
    
        @Override
        public boolean hasContent() {
            return pageDelegate.hasContent();
        }
    
        @Override
        public boolean hasNext() {
            return pageDelegate.hasNext();
        }
    
        @Override
        public boolean hasPrevious() {
            return pageDelegate.hasPrevious();
        }
    
        @Override
        public boolean isFirst() {
            return pageDelegate.isFirst();
        }
    
        @Override
        public boolean isLast() {
            return pageDelegate.isLast();
        }
    
        @Override
        public Iterator<T> iterator() {
            return pageDelegate.iterator();
        }
    
        @Override
        public <S> Page<S> map(Converter<? super T, ? extends S> converter) {
            return pageDelegate.map(converter);
        }
    
        @Override
        public Pageable nextPageable() {
            return pageDelegate.nextPageable();
        }
    
        @Override
        public Pageable previousPageable() {
            return pageDelegate.previousPageable();
        }
    
        public void setContent(List<T> content) {
            pageDelegate = new PageImpl<>(content, null, getTotalElements());
        }
    
    
        public void setTotalElements(int totalElements) {
            pageDelegate = new PageImpl<>(getContent(), null, totalElements);
        }
    
        @Override
        public String toString() {
            return pageDelegate.toString();
        }
    }