图示管理系统（还书、续借、预约功能）jsp+JavaBean+JDBC+servlet+Dao

先在MySql中建一个数据库其中包含三个表，一个book表，一个user表，一个info表

jsp界面只输入图书号，按图书号还书，续借，预约

JavaBean中写了book类，info类，user类，数据库连接类，还有一个时间类

book类

package bean;

public class Book {
   private String id;
   private String name;
   private String author;
   private double price;
   private String info;
   public Book(String id, String name, String author, double price, String info) {
       this.id = id;
       this.name = name;
       this.author = author;
       this.price = price;
       this.info = info;
   }
   public Book() {}
   public String getId() {
       return id;
   }
   public void setId(String id) {
       this.id = id;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String getAuthor() {
       return author;
   }
   public void setAuthor(String author) {
       this.author = author;
   }
   public double getPrice() {
       return price;
   }
   public void setPrice(double price) {
       this.price = price;
   }
   public String getInfo() {
       return info;
   }
   public void setInfo(String info) {
       this.info = info;
   }
}

info类

package bean;

public class Info {
   private String id;
   private String name;
   private String uname;
   private String type;
   private String lendate;
   private String huanqi;
   private String cq;
   private String info;
   private String appoint;
   public Info() {}
   public Info(String id, String name, String uname, String type, String lendate, String huanqi, String cq,
           String info, String appoint) {
       this.id = id;
       this.name = name;
       this.uname = uname;
       this.type = type;
       this.lendate = lendate;
       this.huanqi = huanqi;
       this.cq = cq;
       this.info = info;
       this.appoint = appoint;
   }
   public String getId() {
       return id;
   }
   public void setId(String id) {
       this.id = id;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String getUname() {
       return uname;
   }
   public void setUname(String uname) {
       this.uname = uname;
   }
   public String getType() {
       return type;
   }
   public void setType(String type) {
       this.type = type;
   }
   public String getLendate() {
       return lendate;
   }
   public void setLendate(String lendate) {
       this.lendate = lendate;
   }
   public String getHuanqi() {
       return huanqi;
   }
   public void setHuanqi(String huanqi) {
       this.huanqi = huanqi;
   }
   public String getCq() {
       return cq;
   }
   public void setCq(String cq) {
       this.cq = cq;
   }
   public String getInfo() {
       return info;
   }
   public void setInfo(String info) {
       this.info = info;
   }
   public String getAppoint() {
       return appoint;
   }
   public void setAppoint(String appoint) {
       this.appoint = appoint;
   }
}
user类

package bean;

public class User {
   private String uname;
   private String password;
   private String info;
   public User() {}
   public User(String uname, String password, String info) {
       this.uname = uname;
       this.password = password;
       this.info = info;
   }
   public String getUname() {
       return uname;
   }
   public void setUname(String uname) {
       this.uname = uname;
   }
   public String getPassword() {
       return password;
   }
   public void setPassword(String password) {
       this.password = password;
   }
   public String getInfo() {
       return info;
   }
   public void setInfo(String info) {
       this.info = info;
   }
}

数据库连接类（可作为模板，任何使用JDBC都可以建此类，调用即可）

package bean;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class SJKLJ {
   private static String driverName="com.mysql.jdbc.Driver";
   private static String userName="root";
   private static String userPwd="root";
   private static String dbName="bookmanage";
   public static Connection getDBconnection() {
       String url1="jdbc:mysql://localhost:3306/"+dbName;
       String url2="?user="+userName+"&password="+userPwd;
       String url3="&useUnicode=true&characterEncoding=GB2312";
       String url=url1+url2+url3;
       try {
           Class.forName(driverName);
           Connection conn=DriverManager.getConnection(url);
           return conn;
       } catch (Exception e) {
           e.printStackTrace();
       }
       return null;
   }
   public static void closeB(Connection conn,PreparedStatement pstmt,ResultSet rs) {
       try {
           if(rs!=null)rs.close();
           if(pstmt!=null) pstmt.close();
           if(conn!=null) conn.close();
       } catch (Exception e) {
           e.printStackTrace();
       }
   }
}

时间类（其中包含借书，续借，和超期的时间，我只用到了续借）

package bean;

import java.text.SimpleDateFormat;
import java.util.*;

public class Date_d {
   private String now;

   public String now_time() {
//   SimpleDateFormat format = new SimpleDateFormat("yyyy-mm-dd");

   Calendar calendar = Calendar.getInstance();

int cur_month=calendar.get(Calendar.MONTH)+1;

int cur_year=calendar.get(Calendar.YEAR);

int cur_day=calendar.get(Calendar.DAY_OF_MONTH);

   now = cur_year+"-"+cur_month+"-"+cur_day;

   return now;

   }

   public String huanq() {
       Calendar calendar = Calendar.getInstance();

int cur_month=calendar.get(Calendar.MONTH)+2;

int cur_year=calendar.get(Calendar.YEAR);

int cur_day=calendar.get(Calendar.DAY_OF_MONTH);

       now = cur_year+"-"+cur_month+"-"+cur_day;

       return now;
   }
   public String Xujie() {
       Calendar calendar = Calendar.getInstance();

int cur_month=calendar.get(Calendar.MONTH)+3;

int cur_year=calendar.get(Calendar.YEAR);

int cur_day=calendar.get(Calendar.DAY_OF_MONTH);

       now = cur_year+"-"+cur_month+"-"+cur_day;

       return now;
   }

   @SuppressWarnings("unused")
   public long chaoq(String bl) throws Exception {

       SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

//开始时间

Date startDate = sdf.parse(bl);
//结束时间
Date endDate = sdf.parse(this.now_time());///

//得到相差的天数 betweenDate
long betweenDate = (endDate.getTime() - startDate.getTime())/(60*60*24*1000);

return betweenDate;
}
}

servlet类，我只写了查询id，三个功能的servlet是一样的，只是跳转到的jsp名不一样

Dao中写了，查找id，还书时（更新book的info为可借，更新info表的info为已还），续借时（只需将info表的huanqi加一个月即可），预约时（更新book表的info为不可预约，更新info表的appoint的信息为已被预约）

package Dao;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;

import bean.Book;
import bean.Date_d;
import bean.Info;
import bean.SJKLJ;

public class Dao {
   public List<Info> select(String id) throws Exception{
       String sql="select id,name,uname,type,lendate,huanqi,cq,info,appoint from info where id="+id;
       Connection conn=null;
       PreparedStatement pstmt=null;
       ResultSet rs=null;
       List<Info> list=new ArrayList<Info>();
       conn=SJKLJ.getDBconnection();
           pstmt=conn.prepareStatement(sql);
           rs=pstmt.executeQuery();
           rs.last();
           if(rs.getRow()!=0) {
               rs.beforeFirst();
               while(rs.next()) {
                   String id1=rs.getString("id");
                   String name=rs.getString("name");
                   String uname=rs.getString("uname");
                   String type=rs.getString("type");
                   String lendate=rs.getString("lendate");
                   String huanqi=rs.getString("huanqi");
                   String cq=rs.getString("cq");
                   String info=rs.getString("info");
                   String appoint=rs.getString("appoint");
                   Info in=new Info(id1,name,uname,type,lendate,huanqi,cq,info,appoint);
                   list.add(in);
               }
           }
       SJKLJ.closeB(conn, pstmt, rs);
       return list;
   }
   public int update_b(String id) throws Exception{
       String sql="update book set info = '可借' where id = "+id;
       Connection conn=null;
       PreparedStatement pstmt=null;
       int n=0;
       @SuppressWarnings("unused")
       String m=null;
       conn=SJKLJ.getDBconnection();
           pstmt=conn.prepareStatement(sql);
                   n=pstmt.executeUpdate();
                   SJKLJ.closeB(conn, pstmt, null);
                   return n;
               }
   public int update_i(String id) throws Exception{
       String sql="update info set info ='已还' where id ="+id;
       Connection conn=null;
       PreparedStatement pstmt=null;
       int n=0;
       conn=SJKLJ.getDBconnection();
           pstmt=conn.prepareStatement(sql);
           n=pstmt.executeUpdate()   ;
                   SJKLJ.closeB(conn, pstmt, null);
                   return n;
               }
   public int update_in(String id)throws Exception{
       Date_d dd=new Date_d();
       String now=dd.Xujie();
       String sql="update info set huanqi='"+now+"' where id="+id;
       Connection conn=null;
       PreparedStatement pstmt=null;
       int n=0;
       conn=SJKLJ.getDBconnection();
           pstmt=conn.prepareStatement(sql);
           n=pstmt.executeUpdate()   ;
                   SJKLJ.closeB(conn, pstmt, null);
                   return n;
   }
   public int update_bo(String id)throws Exception{
       String sql="update book set info='不可预约' where id="+id;
       Connection conn=null;
       PreparedStatement pstmt=null;
       int n=0;
       conn=SJKLJ.getDBconnection();
           pstmt=conn.prepareStatement(sql);
           n=pstmt.executeUpdate()   ;
                   SJKLJ.closeB(conn, pstmt, null);
                   return n;
   }
   public int update_inf(String id)throws Exception{
       String sql="update info set appoint='已被预约' where id="+id;
       Connection conn=null;
       PreparedStatement pstmt=null;
       int n=0;
       conn=SJKLJ.getDBconnection();
           pstmt=conn.prepareStatement(sql);
           n=pstmt.executeUpdate()   ;
                   SJKLJ.closeB(conn, pstmt, null);
                   return n;
   }
   public List<Book> select_b(String id)throws Exception{
       String sql="select id,name,author,price,info from book where id="+id;
       Connection conn=null;
       PreparedStatement pstmt=null;
       ResultSet rs=null;
       conn=SJKLJ.getDBconnection();
       pstmt=conn.prepareStatement(sql);
       rs=pstmt.executeQuery();
       rs.last();
       List<Book> list=new ArrayList<Book>();
       if(rs.getRow()!=0) {
           rs.beforeFirst();
           while(rs.next()) {
               String id1=rs.getString("id");
               String name=rs.getString("name");
               String author=rs.getString("author");
               Double price=rs.getDouble("price");
               String info=rs.getString("info");
               Book bb=new Book(id1,name,author,price,info);
               list.add(bb);
               }
       }
       SJKLJ.closeB(conn, pstmt, null);
       return list;
   }
}

最后的show.jsp中，还书和预约相似，续借更为简单

还书：

<%@ page language="java" import="bean.*" import="java.util.*" import="Dao.Dao"
import="java.sql.*" import="bean.SJKLJ" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
Dao d=new Dao();
//System.out.println("111");
@SuppressWarnings("unchecked")
List<Info> list=(List<Info>)session.getAttribute("list");
if(list.get(0).getInfo().equals("")){
   //System.out.println("444");
   //System.out.println(list.get(0).getId());
   int nn=d.update_i(list.get(0).getId());
   //System.out.println("222");
if(nn==1){
   int mm=d.update_b(list.get(0).getId());
   if(mm==1){
       %>还书成功！<%
   }else{
       %>还书失败，出现异常错误！<%
   }
}
}else{
   %>您已经还过此书！<%
}
%>
</body>
</html>

续借：

<%@ page language="java" import="bean.*" import="Dao.Dao" import="java.util.*" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
Dao d=new Dao();
System.out.println("222");
@SuppressWarnings("unchecked")
List<Info> list=(List<Info>)session.getAttribute("list");
System.out.println("333");
int m=d.update_in(list.get(0).getId());
System.out.println("444");
if(m==1){
   System.out.println("555");
   //Date_d dd=new Date_d();
   //String hq=dd.huanq();
   %>续借成功！续借时间为30天，请按时还书！<%
}else{
   %>续借失败！<%
}
%>
</body>
</html>

预约：

<%@ page language="java" import="bean.*" import="java.util.*" import="Dao.Dao"
import="java.sql.*" import="bean.SJKLJ" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
Dao d=new Dao();
@SuppressWarnings("unchecked")
List<Book> list=(List<Book>)session.getAttribute("list");
if(list.get(0).getInfo().equals("预约")){
   //System.out.println("444");
   //System.out.println(list.get(0).getId());
   int nn=d.update_inf(list.get(0).getId());
   //System.out.println("222");
   if(nn==1){
   %>预约成功！<%
   }else{
       %>出现异常错误！<%
   }
}else{
   %>预约失败！<%
}
%>
</body>
</html>

想要添加其他的功能只需在Dao里添加即可！

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