SprinBoot使用PageHelper实现分页

1.引入依赖

 <!-- pagehelper -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.8</version>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.13</version>
        </dependency>

2.写分页工具PageUtil

public class PageUtil {

    /**
     * 开始分页
     *
     * @param list
     * @param pageNum  页码
     * @param pageSize 每页多少条数据
     * @return
     */
    public static List startPage(List list, Integer pageNum,
                                 Integer pageSize) {
        if (list == null) {
            return new ArrayList();
        }
        if (list.size() == 0) {
            return new ArrayList();
        }

        // 记录总数
        Integer count = list.size();
        // 页数
        Integer pageCount = 0;
        if (count % pageSize == 0) {
            pageCount = count / pageSize;
        } else {
            pageCount = count / pageSize + 1;
        }
        // 开始索引
        int fromIndex = 0;
        // 结束索引
        int toIndex = 0;

        if (!pageNum.equals(pageCount)) {
            fromIndex = (pageNum - 1) * pageSize;
            toIndex = fromIndex + pageSize;
        } else {
            fromIndex = (pageNum - 1) * pageSize;
            toIndex = count;
        }


        try {
            List pageList = list.subList(fromIndex, toIndex);
            return pageList;
        } catch (Exception e) {
            return new ArrayList();
        }


    }

}

3.使用分页

 

 List<JSONObject> issues = jiraUtil.getIssue(jiraRestClient, username, reporter, assignee);

 List dataList = PageUtil.startPage(issues, pageIndex, pageSize);

 PageInfo<Object> pageInfo = new PageInfo<>();

 pageInfo.setTotal(issues.size());
 pageInfo.setList(dataList);
 pageInfo.setPageNum(pageIndex);
 pageInfo.setPageSize(pageSize);