Java使用Queryable-pageable实现分页

忘是亡心i 2023-09-28 11:38 133阅读 0赞

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;
    	}
    
    }