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分页配置
stivepeim edited this page Dec 31, 2020
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1 revision
配置代码 此处不需要改动
package com.common;
import com.constants.Constants;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
@Data
public class PageParamRequest {
@ApiModelProperty(value = "页码", example= Constants.DEFAULT_PAGE + "")
private int page = Constants.DEFAULT_PAGE;
@ApiModelProperty(value = "每页数量", example = Constants.DEFAULT_LIMIT + "")
private int limit = Constants.DEFAULT_LIMIT;
}
配置常量
package com.constants;
public class Constants {
//默认分页页码
public static final int DEFAULT_PAGE = 1;
//默认分页每页数量
public static final int DEFAULT_LIMIT = 20;
//此处省略无数其余常量配置
}
- 如果想修改默认分页数值,请修改 DEFAULT_LIMIT 的值即可,这块会在前端不传递分页参数的时候起作用,或者自己new 分页参数类的时候起作用。
- 分页参数的最终值以前端传递为准
- 需要分页的时候在 *ServiceImpl文件的具体方法里,执行sql之前加一行代码
PageHelper.startPage(pageParamRequest.getPage(), pageParamRequest.getLimit());
- 如果最终方法返回的类和当前分页的时候映射的类不相同,例如当前业务是 class a,需要返回 class b,那么需要处理下数据。下文看文章这块如何处理
/**
* 文章列表
* @param request ArticleSearchRequest 请求参数
* @param pageParamRequest 分页类参数
* @author Mr.Zhang
* @since 2020年04月18日
* @return List<Article>
*/
@Override
public PageInfo<ArticleVo> getList(ArticleSearchRequest request, PageParamRequest pageParamRequest) {
//需要做赋值操作
Page<Article> articlePage = PageHelper.startPage(pageParamRequest.getPage(), pageParamRequest.getLimit());
LambdaQueryWrapper<Article> lambdaQueryWrapper = new LambdaQueryWrapper<>();
if(StringUtils.isNotBlank(request.getCid())){
lambdaQueryWrapper.eq(Article::getCid, request.getCid());
}
if(!StringUtils.isBlank(request.getKeywords())){
lambdaQueryWrapper.and(i -> i.or().like(Article::getTitle, request.getKeywords())
.or().like(Article::getAuthor, request.getKeywords())
.or().like(Article::getSynopsis, request.getKeywords())
.or().like(Article::getShareTitle, request.getKeywords())
.or().like(Article::getShareSynopsis, request.getKeywords()));
}
if(request.getIsBanner() != null){
lambdaQueryWrapper.eq(Article::getIsBanner, request.getIsBanner());
}
if(request.getIsHot() != null){
lambdaQueryWrapper.eq(Article::getIsHot, request.getIsHot());
}
if(request.getHide() != null){
lambdaQueryWrapper.eq(Article::getHide, request.getHide());
}
if(request.getStatus() != null){
lambdaQueryWrapper.eq(Article::getStatus, request.getStatus());
}
if(null != request.getIsHaveMediaId()){
lambdaQueryWrapper.isNotNull(Article::getMediaId).ne(Article::getMediaId, "");
}
lambdaQueryWrapper.orderByDesc(Article::getSort).orderByDesc(Article::getVisit).orderByDesc(Article::getCreateTime);
List<Article> articleList = dao.selectList(lambdaQueryWrapper);
ArrayList<ArticleVo> articleVoArrayList = new ArrayList<>();
if(articleList.size() < 1){
return CommonPage.copyPageInfo(articlePage, articleVoArrayList);
}
for (Article article : articleList) {
ArticleVo articleVo = new ArticleVo();
BeanUtils.copyProperties(article, articleVo);
if(!StringUtils.isBlank(article.getImageInput()) ){
articleVo.setImageInput(CrmebUtil.jsonToListString(article.getImageInput()));
articleVo.setImageInputs(article.getImageInput());
}
articleVoArrayList.add(articleVo);
}
//需要通过复制转化分页类指定的对象
return CommonPage.copyPageInfo(articlePage, articleVoArrayList);
}
分页操作类
package com.common;
import com.constants.Constants;
import lombok.Data;
import org.springframework.beans.BeanUtils;
import org.springframework.data.domain.Page;
import com.github.pagehelper.PageInfo;
import java.util.ArrayList;
import java.util.List;
@Data
public class CommonPage<T> {
private Integer page = Constants.DEFAULT_PAGE;
private Integer limit = Constants.DEFAULT_LIMIT;
private Integer totalPage = 0;
private Long total = 0L ;
private List<T> list = new ArrayList<>();
/**
* 将PageHelper分页后的list转为分页信息
*/
public static <T> CommonPage<T> restPage(List<T> list) {
CommonPage<T> result = new CommonPage<T>();
PageInfo<T> pageInfo = new PageInfo<T>(list);
result.setTotalPage(pageInfo.getPages());
result.setPage(pageInfo.getPageNum());
result.setLimit(pageInfo.getPageSize());
result.setTotal(pageInfo.getTotal());
result.setList(pageInfo.getList());
return result;
}
/**
* 将SpringData分页后的list转为分页信息
*/
public static <T> CommonPage<T> restPage(Page<T> pageInfo) {
CommonPage<T> result = new CommonPage<T>();
result.setTotalPage(pageInfo.getTotalPages());
result.setPage(pageInfo.getNumber());
result.setLimit(pageInfo.getSize());
result.setTotal(pageInfo.getTotalElements());
result.setList(pageInfo.getContent());
return result;
}
/**
* 将PageHelper分页后的 PageInfo 转为分页信息
*/
public static <T> CommonPage<T> restPage(PageInfo<T> pageInfo) {
CommonPage<T> result = new CommonPage<T>();
result.setTotalPage(pageInfo.getPages());
result.setPage(pageInfo.getPageNum());
result.setLimit(pageInfo.getPageSize());
result.setTotal(pageInfo.getTotal());
result.setList(pageInfo.getList());
return result;
}
/**
* 对象A复制对象B的分页信息 //TODO 多次数据查询导致分页数据异常解决办法
*/
public static <T> PageInfo<T> copyPageInfo(com.github.pagehelper.Page originPageInfo, List<T> list) {
PageInfo<T> pageInfo = new PageInfo<>(list);
BeanUtils.copyProperties(originPageInfo, pageInfo, "list");
return pageInfo;
}
}
在控制器里需要用下面代码来接受分页类的信息作为数据输出
CommonPage.restPage(articleService.getList(request, pageParamRequest))
对外输出JSON下面自动封装
/**
* 分页显示文章管理表
* @param request ArticleSearchRequest 搜索条件
* @param pageParamRequest 分页参数
* @author Mr.Zhang
* @since 2020年04月18日
*/
@ApiOperation(value = "分页列表")
@RequestMapping(value = "/list", method = RequestMethod.GET)
@ApiImplicitParam(name="keywords", value="搜索关键字")
public CommonResult<CommonPage<ArticleVo>> getList(@Validated ArticleSearchRequest request,
@Validated PageParamRequest pageParamRequest){
return CommonResult.success(CommonPage.restPage(articleService.getList(request, pageParamRequest)));
}