Java使用Queryable-pageable实现分页效果
作者:java李杨勇
这篇文章主要为大家介绍了Java如何使用Queryable-pageable从而实现分页效果,文中的示例代码简洁易懂,感兴趣的小伙伴可以动手尝试一下
在维护老项目的时候需要对部分分页进行手动修改、方式是获取前端的分页参数 page以及rows、 new PageRequest对象把分页参数传进去、通过 queryable.setPageable(pageable);保存、最后进行调用。
完整代码如下:
@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()); // 预处理 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分页工具类:
package com.railway.core.model; import java.io.Serializable; import java.util.List; import com.railway.core.query.data.Page; /** * 页面展示分页 * * @author lyy * * @param <T> */ public class PageJson<T> implements Serializable { private static final long serialVersionUID = 1L; private long page = 1;// 当前页 private long rows = 10;// 每页显示记录数 private long total; // 总数 private long totalPages; // 总页数 private List<T> results; // 结果 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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