Java使用Queryable-pageable实现分页效果
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;
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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