jsp、js分页功能的简单总结

String sql_count = "select count(*) from article a where 1=1";
//然后通过数据库操作获取总条数count
int count = 0;
//(数据库连接过程省略）
Result rs = stmt.executeQuery(sql_count);
if(rs.next()){
    count = rs.getInt(1);    
}

//根据总条数来进行计算相关分页的数据
//定义相关变量
int pages = 0; //当前页码数
int totalPages = 0; //总页数
int limit = 5; //每页的条数
//计算
if(count%limit==0){
	totalPages = count/limit
}else{
	totalPages = count/limit + 1;
}

/*
*该函数的参数说明:参数是个数字，不同数字代表跳到不同的页数或者不同的页面操作
*其中，-1代表跳转到首页，-2代表跳转到尾页，-3代表上一页，-4代表下一页，-5代表跳页
*其余数字均表示跳转到对应数字的页码
*/
//全局变量存储当前页数和总页数
var pages = 1;
var totalPages = 1;
function page_separate(do_what){
	//定义所有与分页有关的变量
	var count = 0;//总条数
	//var totalPages = 1;//总页数
	var limit = 4;//每页显示数
	//var pages = 1;//当前页数
	
	//获取表格信息
	var row_table = document.getElementById("table_test").rows;
	count = row_table.length;
	if(count%limit==0){
		totalPages = count/limit;
	}else{
		totalPages = parseInt(count/limit) + 1;
	}
	
	//根据do_what参数进行对应操作
	if(do_what==-1){
		pages=1;
	}else if(do_what==-2){
		pages=totalPages;
	}else if(do_what==-3){
		if(pages==1){
			alert("已到达首页！");
			return ;
		}else{
			pages = pages-1;
		}
	}else if(do_what==-4){
		if(pages==totalPages){
			alert("已到达尾页！")
		}else{
			pages = pages + 1;
		}
	}else if(do_what==-5){
		//检查输入是否合法
		var is_correct = checkNum();
		if(!is_correct){
			return ;
		}
		pages = document.getElementById("pages").value;
	}else if(do_what>0){
		pages = do_what;
	}
	
	for(var i=0;i<count;i++){
		if(i<(limit*(pages-1)+limit) && i>=limit*(pages-1)){
			row_table[i].style.display = "block";
		}else{
			row_table[i].style.display = "none";
		}	
	}
	var goTo = "总共" + totalPages + "页  " + "当前第" + pages + "页  <a href=‘#‘ onclick=‘page_separate(-1)‘>首页</a>  "
	+ "<a href=‘#‘ onclick=‘page_separate(-2)‘>尾页</a>   <a href=‘#‘ onclick=‘page_separate(-3)‘>上一页</a>  "
	+ "<a href=‘#‘ onclick=‘page_separate(-4)‘>下一页</a>  跳转至"
	+ "<input id=‘pages‘ name=‘pages‘ type=‘text‘ size=‘8‘></input>页  <input type=‘button‘ value=‘GO‘ onclick=‘page_separate(-5)‘></input>";
	//根据页数实行页数隐藏
	var page_count = "";
	if(totalPages<10){
		for(var i=1;i<=totalPages;i++){
			page_count = page_count + "<a href=‘#‘ onclick=‘page_separate(" + i + ")‘>" + i + "</a>  ";
		}
	}else if(totalPages<12 && totalPages>=10){
		for(var i=1;i<=3;i++){
			page_count = page_count + "<a href=‘#‘ onclick=‘page_separate(" + i + ")‘>" + i + "</a>  ";
		}
		page_count = page_count + "<a href=‘#‘ onclick=‘page_separate(" + ((parseInt(totalPages/2))-1) + ")‘>" + ((parseInt(totalPages/2))-1) + "</a>  ";
		page_count = page_count + "<a href=‘#‘ onclick=‘page_separate(" + parseInt(totalPages/2) + ")‘>" + parseInt(totalPages/2) + "</a>  ";
		page_count = page_count + "<a href=‘#‘ onclick=‘page_separate(" + ((parseInt(totalPages/2))+1) + ")‘>" + ((parseInt(totalPages/2))+1) + "</a>  ";
		page_count = page_count + "...  ";
		for(var i=totalPages-2;i<=totalPages;i++){
			page_count = page_count + "<a href=‘#‘ onclick=‘page_separate(" + i + ")‘>" + i + "</a>  ";
		}
	}else{
		for(var i=1;i<=3;i++){
			page_count = page_count + "<a href=‘#‘ onclick=‘page_separate(" + i + ")‘>" + i + "</a>  ";
		}
		page_count = page_count + "...  ";
		page_count = page_count + "<a href=‘#‘ onclick=‘page_separate(" + ((parseInt(totalPages/2))-1) + ")‘>" + ((parseInt(totalPages/2))-1) + "</a>  ";
		page_count = page_count + "<a href=‘#‘ onclick=‘page_separate(" + parseInt(totalPages/2) + ")‘>" + parseInt(totalPages/2) + "</a>  ";
		page_count = page_count + "<a href=‘#‘ onclick=‘page_separate(" + ((parseInt(totalPages/2))+1) + ")‘>" + ((parseInt(totalPages/2))+1) + "</a>  ";
		page_count = page_count + "...  ";
		for(var i=totalPages-2;i<=totalPages;i++){
			page_count = page_count + "<a href=‘#‘ onclick=‘page_separate(" + i + ")‘>" + i + "</a>  ";
		}	
	}
	document.getElementById("paging").innerHTML = goTo;
	document.getElementById("page_count").innerHTML = page_count;
}
//检查输入是否合法的函数
function checkNum(){
	var char_pages = document.getElementById("pages").value;
	if(char_pages==null || char_pages==""){
		alert("请输入跳转的页数！");
		return false;
	}else{
		
		if(!(/(^[1-9]\d*$)/.test(char_pages))){
			alert("您输入的页数格式不对，请重新输入！");
			return false;
		}else{
			if(char_pages>totalPages){
				alert("您输入的页数大于总页数！");
				return false;
			}
		}
	}	
}