java分页通用篇

Posted 2020-10-06 回青

一、创建分页通用类

 1 package com.dkyw.util;
 2 
 3 import java.util.List;
 4 
 5 public class Page<T> {
 6     private int total;//总页数
 7     private int pageIndex;//当前页码
 8     private int pageSize;//每页大小
 9     private List<T> rows;//当前页的集合对象
10     
11     public int getTotal() {
12         return total;
13     }
14     public void setTotal(int total) {
15         this.total = total;
16     }
17     public int getPageIndex() {
18         return pageIndex;
19     }
20     public void setPageIndex(int pageIndex) {
21         this.pageIndex = pageIndex;
22     }
23     public int getPageSize() {
24         return pageSize;
25     }
26     public void setPageSize(int pageSize) {
27         this.pageSize = pageSize;
28     }
29     public List<T> getRows() {
30         return rows;
31     }
32     public void setRows(List<T> rows) {
33         this.rows = rows;
34     }
35     
36 }

 

二、serivice层封装返回的集合信息为page对象的集合

public Page<Template> getTemplateForPage(int pageIndex,int pageSize) {
        int pageStart = (pageIndex - 1) * pageSize;
        List<Template> list = templateDao.getForPage(pageStart,pageSize);
        for (Template template : list) {
            template.setDataSource(dataSourceDao.getById(template
                    .getDataSourceId()));
        }
        
        Page<Template> page =new Page<Template>();
        page.setPageIndex(pageIndex);
        page.setPageSize(pageSize);
        page.setRows(list);
        int count = templateDao.getCount();
        page.setTotal((int)Math.ceil(count*1.0/pageSize));
        return page;
    }

三、返回至前端后的处理

    /* 获取分页数据 */
    function getTemplateInfoForPage(pageIndex,pageSize){
        $.ajax({
            url : "getTemplateInfoForPage.action",//要请求的服务器url 
            data : {
                "pageIndex" : pageIndex,
                "pageSize":pageSize
            },
            async : true, //是否为异步请求
            type : "POST", //请求方式为POST
            success : function(result) {
                console.log("分页数据");
                result = JSON.parse(result);
                var _LENGTH = 3;//最大页数3
                //拼接分页
                if(result[0].total<_LENGTH){
                    $("#pageInfo").html("");
                    var start = (pageIndex-1)>0 ? pageIndex-1 : pageIndex;
                    var end = (pageIndex+1)<=result[0].total ? pageIndex+1 : pageIndex;
                    $("#pageInfo").append("<li><a onclick=‘getTemplateInfoForPage("+start +","+pageSize+")‘ aria-label=‘Previous‘><span aria-hidden=‘true‘>&laquo;</span></a></li>");
                    for (var int = 1; int < result[0].total+1; int++) {
                        if(int==pageIndex){
                            $("#pageInfo").append("<li class=‘active‘><a onclick=‘getTemplateInfoForPage("+int+","+pageSize+")‘>"+int+"</a></li>");
                        }else{
                            $("#pageInfo").append("<li><a onclick=‘getTemplateInfoForPage("+int+","+pageSize+")‘>"+int+"</a></li>");
                        }
                        
                    }
                    $("#pageInfo").append("<li><a onclick=‘getTemplateInfoForPage("+end+","+pageSize+")‘ aria-label=‘Next‘><span aria-hidden=‘true‘>&raquo;</span></a></li>")
                }else{
                    debugger;
                    $("#pageInfo").html("");
                    var pageArr=new Array();
                    //4
                    if(pageIndex+Math.floor(_LENGTH/2) <= result[0].total&&pageIndex-Math.floor(_LENGTH/2) > 0){//当前页没有超过总页数
                        for(var i = 0 ;i < _LENGTH; i++){
                            pageArr[i] = pageIndex-Math.floor(_LENGTH/2) + i;
                        }
                    }else if(pageIndex<=Math.floor(_LENGTH/2)){
                        for (var int2 = 1; int2 < _LENGTH+1; int2++) {
                            pageArr.push(int2);
                        }
                           // pageArr = [1,2,3,4,5,6,7,8,9] ;
                    }else{
                        for(var i = 0 ;i < _LENGTH; i++){
                            //8
                            pageArr[i] = result[0].total-(_LENGTH-1)+i;
                        }
                    }
                    
                    var start = (pageIndex-1)>0 ? pageIndex-1 : pageIndex;
                    var end = (pageIndex+1)<=result[0].total ? pageIndex+1 : pageIndex;
                    $("#pageInfo").append("<li><a onclick=‘getTemplateInfoForPage("+start +","+pageSize+")‘ aria-label=‘Previous‘><span aria-hidden=‘true‘>&laquo;</span></a></li>");
                    for (var int = pageArr[0]; int <= pageArr[pageArr.length-1]; int++) {
                        if(int==pageIndex){
                            $("#pageInfo").append("<li class=‘active‘><a onclick=‘getTemplateInfoForPage("+int+","+pageSize+")‘>"+int+"</a></li>");
                        }else{
                            $("#pageInfo").append("<li><a onclick=‘getTemplateInfoForPage("+int+","+pageSize+")‘>"+int+"</a></li>");
                        }
                        
                    }
                    $("#pageInfo").append("<li><a onclick=‘getTemplateInfoForPage("+end+","+pageSize+")‘ aria-label=‘Next‘><span aria-hidden=‘true‘>&raquo;</span></a></li>")
                    
                    
                    
                }
                
                
                
                $("#tbody").html("");
                $.each(result[0].rows,function(index,item){
                    console.log(item);
                    $("#tbody").append("<tr onclick=‘showTemplate("+item.id
                            +",\""+item.echartType+"\");‘>"
                            +"<td><input type=‘checkbox‘ name=‘deletecheck‘data-id="+item.id+" data-type="+echartTypemap[item.echartType]+"></td>"
                            +"<td>"+item.id+"</td>"
                            +"<td>"+item.templateName+"</td>"
                            +"<td>"+item.dataSource.dataName+"</td>"
                            +"<td>"+getEchartType(item.echartType)+"</td>"
                            +"<td>"+getEchartMethod(item.echartMethod)+"</td>"
                            +"<td>"+item.tableName+"</td>"
                            +"<td><button type=‘button‘ class=‘btn btn-default‘ onclick=‘updateTemplate("+
                                   item.id+","+item.dataSource.id+",\""+item.templateName+"\",\""+item.echartType+"\",\""+item.rowField+"\",\""+item.tableName+"\");‘>修改</button></td>"
                            +"</tr>");
                });
            }
        })
    }