Spring Boot mybatis HashMap +layui 通用分页

背景：

mybatis 常用数据查询的方法都是先建实体类，再建Mapper，最后写Service，如果只是单纯的去查询数据显示，这样操作太麻烦。本文就以mybatis +layui创建通用分页类，简化这一操作，提升开发效率（没考虑注入情况读者自行修改）

有需要的同学可以下载 示例代码

先看效果

1.添加静态文件资源

把UI静态文件拷入resources/static文件夹中

2.添加分页dao

@Mapper
@Repository
public interface PageDao {

    @Select("select count(1) from ${table}")
    int findCountAll(@Param("table") String table);

    @Select("select * from ${table} limit #{pagestart}, #{pagesize}")
    List<HashMap<String, Object>> findMapPageAll(@Param("table") String table, @Param("pagestart") int pagestart, @Param("pagesize") int pagesize);

    @Select("select count(1) from ${table} where ${strWhere}")
    int findCount(@Param("table") String table, @Param("strWhere") String strWhere);

    @Select("select ${fileds} from ${table} where ${strWhere} ${order} limit #{pagestart}, #{pagesize}")
    List<HashMap<String, Object>> findMapPage(@Param("table") String table,
                                              @Param("fileds") String fileds,
                                              @Param("order") String order,
                                              @Param("strWhere") String strWhere,
                                              @Param("pagestart") int pagestart,
                                              @Param("pagesize") int pagesize);

    @Select("select ${fileds} from ${table} where ${strWhere} ${order}")
    List<HashMap<String, Object>> findMapAll(@Param("table") String table,
                                             @Param("fileds") String fileds,
                                             @Param("order") String order,
                                             @Param("strWhere") String strWhere
    );

}

3.添加PageService

@Service
public class PageService {

    @Autowired
    PageDao pageDao;

    public int findCount(String table){
        return  pageDao.findCountAll(table);
    }
    public List<HashMap<String, Object>> findMapPage(String table, int pagestart, int pagesize){
        return  pageDao.findMapPageAll(table,pagestart, pagesize);
    }
    public int findCount(String table, String strWhere){
        return  pageDao.findCount(table,strWhere);
    }
    public List<HashMap<String, Object>> findMapPage(String table,String fileds,String order,String strWhere,int pagestart,int pagesize){
        return  pageDao.findMapPage(table,fileds,order,strWhere,pagestart,pagesize);
    }

    public List<HashMap<String, Object>> findMapAll(String table,String fileds,String order,String strWhere){
        return  pageDao.findMapAll(table,fileds,order,strWhere);
    }

}

4.建立Controller

 @Autowired
    PageService pageService;

    @RequestMapping(value = "/pagelist", method = {RequestMethod.GET, RequestMethod.POST})
    public String pagelist() {

        return "pagelist";
    }

    @RequestMapping("/pagelsitquery")
    @ResponseBody
    public String pagelsitquery(HttpServletResponse response, ModelMap modelMap, PageSearch pageConf) throws IOException {

        int currentPage = pageConf.getCurrentPage();
        int pageSize = pageConf.getPageSize();
        int pagestart=(currentPage-1)*pageSize;
        String tables = "groupidinfo t   ";
        String files = "t.*";
        String order = "order by t.id desc ";
        String where = "1=1";

        if(!StringUtils.isBlank(pageConf.getKey())){
            String key=pageConf.getKey();
            where=where+" and  groupId like '%"+key+"%' ";
        }

        int total=pageService.findCount(tables,where);
        List<HashMap<String, Object>> map= pageService.findMapPage(tables,files,order,where,pagestart,pageSize);
        Map<String, Object> obj=new HashMap<String,Object>();
        obj.put("total",total);
        obj.put("list",map);
        ObjectMapper objectMapper = new ObjectMapper();
        String jsonString=objectMapper.writeValueAsString(obj);

        return  jsonString;

    }

5.创建HTML，关键JS

/**
         * 初始化layui分页
         */

        function initLayPage(pageConf) {
            if(!pageConf){
                pageConf ={};
                pageConf.pageSize = 20;
                pageConf.currentPage = 1;

            }
            key=$('#key').val();

            pageConf.key=key;

            console.log(pageConf);

            $.post("pagelsitquery", pageConf, function (data) {

                layui.use(['laypage', 'layer'], function () {
                    var page = layui.laypage;
                    page.render({
                        elem: 'layui',
                        count: data.total,
                        curr: pageConf.currentPage,
                        limit: pageConf.pageSize,
                        first:"首页",
                        last:"尾页",
                        layout: ['count', 'prev', 'page', 'next', 'limit', 'skip'],
                        jump: function (obj, first) {
                            if (!first) {
                                pageConf.currentPage = obj.curr;
                                pageConf.pageSize = obj.limit;
                                initLayPage(pageConf);
                            }
                        }
                    });
                    fillTable(data.list,(pageConf.currentPage - 1) * pageConf.pageSize); //页面填充
                })
            },"json");
        }
        //填充表格数据
        function fillTable(data,num) {

            var info = '';
            $.each(data, function (index, obj) {

                info += '<tr>'+
                    '<td>' + getValue(obj.id) + '</td>'+
                    '<td>' + getValue(obj.groupId) + '</td>'+
                    '<td>' + getValue(obj.version) + '</td>'+
                    '<td>' + getValue(obj.cluster) + '</td>'+
                    '<td>' + getValue(obj.timeout) + '</td>'+
                    '<td>' + getValue(obj.retries) + '</td>'+

                    '</tr>';
            });
            //alert(info);
            $("#tab_list").html(info);

        }
        function getValue(v) {
            if(v==undefined)return "";
            return v;

        }