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Java使用Queryable-pageable實(shí)現(xiàn)分頁(yè)效果

更新時(shí)間：2022年06月21日 14:34:14 作者：java李楊勇

這篇文章主要為大家介紹了Java如何使用Queryable-pageable從而實(shí)現(xiàn)分頁(yè)效果，文中的示例代碼簡(jiǎn)潔易懂，感興趣的小伙伴可以動(dòng)手嘗試一下

在維護(hù)老項(xiàng)目的時(shí)候需要對(duì)部分分頁(yè)進(jìn)行手動(dòng)修改、方式是獲取前端的分頁(yè)參數(shù) page以及rows、 new PageRequest對(duì)象把分頁(yè)參數(shù)傳進(jìn)去、通過 queryable.setPageable(pageable);保存、最后進(jìn)行調(diào)用。

完整代碼如下：

    @ResponseBody
    @RequestMapping(value = "getLbjzkList", method = RequestMethod.GET)
    @PageableDefaults(sort = "id=desc")
    private void ajaxList(Queryable queryable, PropertyPreFilterable propertyPreFilterable, HttpServletRequest request,
        HttpServletResponse response) throws IOException {
        EntityWrapper<LbjZk> entityWrapper = new EntityWrapper<LbjZk>(entityClass);
        propertyPreFilterable.addQueryProperty("id");
        propertyPreFilterable.addQueryProperty("name");
       Integer page= Integer.parseInt(request.getParameter("page").toString());
       Integer rows= Integer.parseInt(request.getParameter("rows").toString());
 
        // 預(yù)處理
        queryable.setPageable(new PageRequest(page, rows));
        QueryableConvertUtils.convertQueryValueToEntityValue(queryable, entityClass);
        SerializeFilter filter = propertyPreFilterable.constructFilter(entityClass);
        PageJson<LbjZk> pagejson = new PageJson<LbjZk>(lbjZkService.list(queryable,entityWrapper));
        String content = JSON.toJSONString(pagejson, filter);
        StringUtils.printJson(response, content);
    }

PageJson分頁(yè)工具類：

package com.railway.core.model;
 
import java.io.Serializable;
import java.util.List;
 
import com.railway.core.query.data.Page;
 
/**
 * 頁(yè)面展示分頁(yè)
 * 
 * @author lyy
 *
 * @param <T>
 */
public class PageJson<T> implements Serializable {
	private static final long serialVersionUID = 1L;
	private long page = 1;// 當(dāng)前頁(yè)
	private long rows = 10;// 每頁(yè)顯示記錄數(shù)
	private long total; // 總數(shù)
	private long totalPages; // 總頁(yè)數(shù)
	private List<T> results; // 結(jié)果
 
	public PageJson() {
 
	}
 
	public PageJson(List<T> results) {
		this(0, Long.MAX_VALUE, Long.MAX_VALUE, results);
	}
 
	public PageJson(Page<T> page) {
		this(page.getNumber(), page.getSize(), page.getTotalElements(), page.getContent());
	}
 
	public PageJson(long page, long rows, long total, List<T> results) {
		this.page = page;
		this.rows = rows;
		this.total = total;
		this.results = results;
		this.totalPages = getRows() == 0 ? 1 : (int) Math.ceil((double) total / (double) getRows());
	}
 
	public long getPage() {
		return page;
	}
 
	public void setPage(long page) {
		this.page = page;
	}
 
	public long getRows() {
		return rows;
	}
 
	public void setRows(long rows) {
		this.rows = rows;
	}
 
	public long getTotal() {
		return total;
	}
 
	public void setTotal(long total) {
		this.total = total;
	}
 
	public long getTotalPages() {
		return totalPages;
	}
 
	public List<T> getResults() {
		return results;
	}
 
	public void setResults(List<T> results) {
		this.results = results;
	}
 
}

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