12.17

图书信息管理系统（使用layui）

底层的service和servlet层的代码：

package service;

import bean.dao;
import bean.info;
import java.util.ArrayList;
import java.util.List;

public class Service {
    static dao dao=new dao();
    public static boolean add(info activity) {
        // TODO 自动生成的方法存根
        if(dao.findISBN(activity.getISBN())==true) {
            System.out.print("已有此图书信息");
            return false;
        }
        else{
            dao.add(activity);
            return true;
        }
    }
    
    public static List<info> list() {    
        return dao.getAllinformation();
    }
}

package servlet;

import java.io.IOException;

import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import bean.dao;
import bean.info;

import service.Service;

/**
 * Servlet implementation class Servlet
 */
@WebServlet("/Servlet")
public class Servlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Servlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        info webactivity=new info();
        
        Service service=new Service();
        
        
        String author = request.getParameter("author");
        String ISBN = request.getParameter("ISBN");
        String banname=request.getParameter("banname");
        String category=request.getParameter("category");
        String introduction=request.getParameter("introduction");
        String evaluate=request.getParameter("evaluate");
        
        String method=request.getParameter("method");
        System.out.println(ISBN);
        
        webactivity.setAuthor(author);
        webactivity.setISBN(ISBN);
        webactivity.setBanname(banname);
        webactivity.setCategory(category);
        webactivity.setIntroduction(introduction);
        webactivity.setEvaluate(evaluate);
         
         if("add".equals(method)) {
             if(Service.add(webactivity)) {
                System.out.print("添加成功");
                List<info> activity11=Service.list();
                request.setAttribute("activity11",activity11); 
                request.setAttribute("message", "添加成功");
                request.getRequestDispatcher("message.jsp").forward(request,response);
            }
            else {
                System.out.println("添加失败");
                request.setAttribute("message", "添加失败，请重新添加");
                request.getRequestDispatcher("message.jsp").forward(request,response);
            }
        }
         
         if("del".equals(method)) {
             dao sd=new dao();
             try{                    
                    sd.delete(ISBN);
                    System.out.println("listshow");
                    request.getRequestDispatcher("delete.jsp").forward(request, response);

                }catch(Exception e){
                    System.out.println("未能正确显示出图书信息");
                    e.printStackTrace();
                }
        }
         
         if("update".equals(method)) {
             dao sd=new dao();
             try{                    
                    sd.update(webactivity);
                    System.out.println("listshow");
                    request.getRequestDispatcher("update.jsp").forward(request, response);

                }catch(Exception e){
                    System.out.println("未能正确显示出图书信息");
                    e.printStackTrace();
                }
        }
         
         
         if("show".equals(method)) {
             dao sd=new dao();
                try{
                
                java.util.List<info> list=sd.getAllinformation();
                
                request.setAttribute("list", list);
                System.out.println("listshow");
                request.getRequestDispatcher("show.jsp").forward(request, response);

            }catch(Exception e){
                System.out.println("未能正确显示出图书信息");
                e.printStackTrace();
            }
        }
        
         if("select".equals(method)) {
             dao sd=new dao();
                try{
                
                java.util.List<info> list=sd.select(ISBN);
                
                request.setAttribute("list", list);
                System.out.println("listshow");
                request.getRequestDispatcher("delete.jsp").forward(request, response);

            }catch(Exception e){
                System.out.println("未能正确显示出图书信息");
                e.printStackTrace();
            }
        }
         
         if("select1".equals(method)) {
             dao sd=new dao();
                try{
                
                java.util.List<info> list=sd.select(ISBN);
                
                request.setAttribute("list", list);
                System.out.println("listshow");
                request.getRequestDispatcher("update.jsp").forward(request, response);

            }catch(Exception e){
                System.out.println("未能正确显示出图书信息");
                e.printStackTrace();
            }
        }
         
         if("jisuanji".equals(method)) {
             dao sd=new dao();
                try{
                
                java.util.List<info> list=sd.jisuanji();
                System.out.println(123);
                request.setAttribute("list", list);
                System.out.println("listshow");
                request.getRequestDispatcher("show.jsp").forward(request, response);

            }catch(Exception e){
                System.out.println("未能正确显示出图书信息");
                e.printStackTrace();
            }
        }
         
         if("renwen".equals(method)) {
             dao sd=new dao();
                try{
                
                java.util.List<info> list=sd.renwen();
                System.out.println(123);
                request.setAttribute("list", list);
                System.out.println("listshow");
                request.getRequestDispatcher("show.jsp").forward(request, response);

            }catch(Exception e){
                System.out.println("未能正确显示出图书信息");
                e.printStackTrace();
            }
        }
         
         if("ziran".equals(method)) {
             dao sd=new dao();
                try{
                
                java.util.List<info> list=sd.ziran();
                System.out.println(123);
                request.setAttribute("list", list);
                System.out.println("listshow");
                request.getRequestDispatcher("show.jsp").forward(request, response);

            }catch(Exception e){
                System.out.println("未能正确显示出图书信息");
                e.printStackTrace();
            }
        }
         
         if("tianwen".equals(method)) {
             dao sd=new dao();
                try{
                
                java.util.List<info> list=sd.tianwen();
                System.out.println(123);
                request.setAttribute("list", list);
                System.out.println("listshow");
                request.getRequestDispatcher("show.jsp").forward(request, response);

            }catch(Exception e){
                System.out.println("未能正确显示出图书信息");
                e.printStackTrace();
            }
        }
         
        //response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

至此，一个简单的图书管理系统就使用layui全部完成。