(车辆管理系统)2018-07-23实训第六天笔记

今天做了一个分页和一个搜索

由于有该项目里很多网页有分页的操作所以写 一个工具类来写分页的操作,分页工具类代码如下

package tool;

public class PageUtil {
	private int total;//一共多少条---通过条件查出来的并赋值
	private int pageSize=2;//一页的条数----可以随意赋值
	private int totalPage = 1;//一共多少页-----通过使用变量total算法get
	private int currPage = 1;//当前页----通过JSP代码获得
	private int firstCurrTnum = 0;//当前第一条 条数----通过当前页用算法get

	public int getTotal() {
		return total;
	}

	public void setTotal(int total) {
		this.total = total;
	}

	public int getPageSize() {
		return pageSize;
	}

	public void setPageSize(int pageSize) {
		this.pageSize = pageSize;
	}

	public int getTotalPage() {
		if(total%pageSize==0){
			totalPage = total/pageSize;
		}else{
			totalPage = total/pageSize+1;
		}
		return totalPage;
	}

	public void setTotalPage(int totalPage) {
		this.totalPage = totalPage;
	}

	public int getCurrPage() {
		return currPage;
	}

	public void setCurrPage(int currPage) {
		this.currPage = currPage;
	}

	public int getFirstCurrTnum() {
		firstCurrTnum = (currPage-1)*pageSize;
		return firstCurrTnum;
	}

	public void setFirstCurrTnum(int firstCurrTnum) {
		this.firstCurrTnum = firstCurrTnum;
	}
	/**
	 * 得到分页的Html
	 * @return
	 */
	public String getHtml(){
		StringBuffer buffer = new StringBuffer();
		buffer.append("<table width=\"90%\" align=\"center\" style=\"padding-right:40px;\">");
		buffer.append("<tr><td align=\"right\">共"+getTotal()+"条，"+getTotalPage()+"页，当前第"+getCurrPage()+"页  ");
		buffer.append("<a href=\"DeptSerlet?currPage=1\">首页   </a>");  
		if(getCurrPage()==1){
		   buffer.append("<a href='DeptSerlet?currPage=1'> 上一页</a>");
		}else{
		    buffer.append("<a href='DeptSerlet?currPage="+(getCurrPage()-1)+"'> 上一页</a>");
		}
		if(currPage==totalPage){
		   buffer.append("<a href='DeptSerlet?currPage="+getTotalPage()+"'> 下一页</a>");
		}else{
		   buffer.append("<a href='DeptSerlet?currPage="+(getCurrPage()+1)+"'> 下一页</a>");
		}  	
		 buffer.append("<a href=\"DeptSerlet?currPage="+getTotalPage()+"\">尾页</a> </td></tr></table>");
		return buffer.toString();
	}

}

Serlet查询代码如下:

			//搜索
			DeptService deptService = new DeptService();//部门服务类
			PageUtil pageUtil = new PageUtil();//分页工具类
			search = request.getParameter("search");
			//一共多少条
			pageUtil.setTotal(deptService.countAllDept(search));
			//当前第几页	
			int currPage = 1;//默认是第一页
			if(request.getParameter("currPage")!=null){
					currPage = Integer.valueOf(request.getParameter("currPage"));
					pageUtil.setCurrPage(currPage);
			}		
			List<Dept> list = deptService.getAllDepts(pageUtil.getPageSize(),pageUtil.getFirstCurrTnum(),search);
			request.setAttribute("page", pageUtil.getHtml());
			request.setAttribute("deptList",list);
			skip(request, response);