JavaWeb项目-图书借阅系统

1、项目需求：

图书馆管理系统，能进图书管理系统软件图书管理系统软件行图书馆管理系统能实测国民经济和企业的各种运行情况；利用过去的数据预测未来；从企业全局出发辅助企业进行管理决策；利用信息控制企业的行为；帮助企业实现其规划目标。

2.系统要求与功能设计

2.1 页面要求

（1）能够在Tomcat服务器中正确部署，并通过浏览器查看；

（2）网站页面整体风格统一；

（3）首页(登录页)要求实现不同用户登录后，进入的功能页不相同。

（4）读者功能页：有浏览图书信息、查询图书信息、借阅图书，浏览催还书目、归还图书五个功能模块。

（5）管理员功能页：有添加读者信息、添加新书信息、打印催还书目信息三个模块。

2.2功能要求：

（1）浏览图书信息：读者登录后以列表形式可以查看所有图书基本信息，包括唯一编号、书名、作者名、出版社名称信息、可借阅数量；

（2）查询图书信息：可以按照书名或作者名进行模糊检索，以列表形式查看符合条件的图书信息。

（3）借阅图书功能：读者选择查询图书相应信息，跳转到书目的详细信息界面，当可借阅数量大于零，点击借阅按钮，提示用户借阅成功，并显示归还日期（三个月），否则提示用户该书可借阅数量为0，无法借阅。

（4）浏览催还书目：读者查看个人超期的图书列表信息。

（5）归还图书功能：读者可以查看个人借阅的所有书目列表信息，选择其中一项，则跳转到书目的详细信息界面，点击归还按钮，提示用户还书成功，如果该书超期，以一天0.1元计算罚金，提示用户需要缴纳罚金。

（6）添加读者基本信息：管理员可以添加读者基本信息，读者基本信息包括学号（八位数字组成，例如20180052）、读者姓名、读者性别、所在学院组成；

（7）添加新书基本信息：管理员可以添加新书基本信息，新书基本信息包括唯一编号、书名、作者名、出版社名称，可借阅数量；

（8）打印催还书目功能：显示所有用户的超期图书信息；

（9）登陆功能：管理员、读者登陆后可以看到不同的功能页面，读者登陆后只能看到自己的相关信息，不同读者登陆后无法查看其他人的信息。（要求至少创建五个读者用户演示选课过程）

3数据库设计：

要求实现图书基本信息表、借阅基本信息表、催还基本信息表、读者基本信息表。

4、WEB发布：

要求可以实现在浏览器直接访问系统。

源代码

package test2;

import java.sql.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Pattern;
public class Data {
    
    //连接数据库***********************************************************************
    public Connection getConnection()//连接数据库
    {
        try{
            Class.forName("com.mysql.cj.jdbc.Driver");
            //System.out.println("加载驱动成功");
        }catch(ClassNotFoundException e)
        {
            e.printStackTrace();
        }
        String user="root";
        String password="123456";
        String url = "jdbc:mysql://localhost:3306/ztest01?useSSL=false&serverTimezone=Asia/Shanghai&characterEncoding=utf-8&autoReconnect=true";
        Connection con=null;
        try{
            con=DriverManager.getConnection(url,user,password);
            //System.out.println("数据库连接成功");
        }catch(SQLException e)
        {
            e.printStackTrace();
        }
        return con;
    }
    //关闭方法**********************************************************************
     public  void close (Connection con)
        {
            try{
                if(con!=null)
                {
                    con.close();
                }
            }catch(SQLException e)
                {
                    e.printStackTrace();
                }
        }
     public  void close (PreparedStatement preparedStatement)
     {
            try{
                if(preparedStatement!=null)
                {
                    preparedStatement.close();
                }
            }catch(SQLException e)
            {
                e.printStackTrace();
            }
      }
     public  void close(ResultSet resultSet)
      {
            try{
                if(resultSet!=null)
                {
                    resultSet.close();
                }
            }catch(SQLException e)
            {
                e.printStackTrace();
            }
       }
     //数据库操作********************************************************************
        public void addreader(String id,String name,String sex,String school,String password)//add reader
        {
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null;       
            try {
                String sql = "insert into readers (id,name,sex,school,password) values (?,?,?,?,?)";
                preparedStatement=connection.prepareStatement(sql);
                preparedStatement.setString(1,id);
                preparedStatement.setString(2,name);
                preparedStatement.setString(3,sex);
                preparedStatement.setString(4,school);
                preparedStatement.setString(5,password);
                preparedStatement.executeUpdate();
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(preparedStatement);
                close(connection);
            }
        }
        public void addbook(String id,String name,String author,String company,String number,String nowout)//add book
        {
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null;       
            try {
                String sql = "insert into books (id,name,author,company,number,nowout) values (?,?,?,?,?,?)";
                preparedStatement=connection.prepareStatement(sql);
                preparedStatement.setString(1,id);
                preparedStatement.setString(2,name);
                preparedStatement.setString(3,author);
                preparedStatement.setString(4,company);
                preparedStatement.setString(5,number);
                preparedStatement.setString(6,nowout);
                preparedStatement.executeUpdate();
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(preparedStatement);
                close(connection);
            }
        }
        
        public void addborrow(String readerid,String bookid,String outnow) {
            Connection connection = getConnection();
            PreparedStatement preparedStatement1=null;
            PreparedStatement preparedStatement2=null;
            try {
                String sql1 = "insert into borrows (readerid,bookid,borrowtime) values (?,?,?)";
                preparedStatement1=connection.prepareStatement(sql1);
                preparedStatement1.setString(1,readerid);
                preparedStatement1.setString(2,bookid);

                SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss" );
                Date dadate = new Date();
                String nowDaDate = sdf.format(dadate);
                Timestamp daTs = Timestamp.valueOf(nowDaDate);
                preparedStatement1.setTimestamp(3,daTs);
                
                String sql2 = "update books set outnow=? where id=?";
                preparedStatement2=connection.prepareStatement(sql2);
                preparedStatement2.setString(1,outnow);
                preparedStatement2.setString(2,bookid);
                
                preparedStatement1.executeUpdate();
                preparedStatement2.executeUpdate();
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(preparedStatement1);
                close(preparedStatement2);
                close(connection);
            }
        }
        
        public void back(String readerid,String bookid,String outnow)
        {
            Connection connection = getConnection();
            PreparedStatement preparedStatement1=null;
            PreparedStatement preparedStatement2=null;      
            try {
                String sql = "delete from borrows where bookid= ? and readerid = ?";
                preparedStatement1=connection.prepareStatement(sql);
                preparedStatement1.setString(1,bookid);
                preparedStatement1.setString(2,readerid);
                
                String sql2 = "update books set outnow=? where id=?";
                preparedStatement2=connection.prepareStatement(sql2);
                preparedStatement2.setString(1,outnow);
                preparedStatement2.setString(2,bookid);
                
                preparedStatement1.executeUpdate();
                preparedStatement2.executeUpdate();
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(preparedStatement1);
                close(preparedStatement2);
                close(connection);
            }
        }
        
        
    
    //判断******************************************************************************
        public boolean passwordIsRightStudents(String id,String password) { //judge password is right-Students
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null; 
            ResultSet rs=null;
            try {
                String sql = "select * from readers";
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                while(rs.next()){
                    if( id.equals(rs.getObject(1))&&password.equals(rs.getObject(5)) )
                            return true;
                }           
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(rs);
                close(preparedStatement);
                close(connection);
            }
            return false;
        }
        
        
        public boolean useridisIdRight(String num) {//judge userid
            int k=0;
            if(num.length()==8) {
                for(int i=0;i<8;i++) {
                    char c=num.charAt(i);
                    if(c=='0'||c=='1'||c=='2'||c=='3'||c=='4'||c=='5'||c=='6'||c=='7'||c=='8'||c=='9')
                        k++;
                }
                if(k==8) 
                    return true;
                else return false;
            }
            else return false;
        }
        
        
        public boolean studentexist(String id) { //have this student
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null; 
            ResultSet rs=null;
            try {
                String sql = "select id from readers";
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                while(rs.next()){
                    if( id.equals(rs.getObject(1)) )
                            return true;
                }
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(rs);
                close(preparedStatement);
                close(connection);
            }
            return false;
        }
        
        public boolean bookexist(String id) { //have this book
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null; 
            ResultSet rs=null;
            try {
                String sql = "select id from books";
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                while(rs.next()){
                    if( id.equals(rs.getObject(1)) )
                            return true;
                }
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(rs);
                close(preparedStatement);
                close(connection);
            }
            return false;
        }
        public boolean bookidisIdRight(String num) {//judge bookid
            int k=0;
            for(int i=0;i<num.length();i++) {
                char c=num.charAt(i);
                if(c=='0'||c=='1'||c=='2'||c=='3'||c=='4'||c=='5'||c=='6'||c=='7'||c=='8'||c=='9')
                    k++;
            }
            if(k==num.length()) 
                return true;
            else return false;

        }
        public boolean isNumber(String str) {//judge int
            Pattern pattern = Pattern.compile("^[-\+]?[\d]*$");
            return pattern.matcher(str).matches();
        }
        
        
        public boolean readerHaveBorrow(String readerid,String bookid) { //student have chosen this book
            Connection connection = getConnection();
            PreparedStatement preparedStatement=null; 
            ResultSet rs=null;
            try {
                String sql = "select * from borrows";
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                while(rs.next()){
                    if( readerid.equals(rs.getObject(2))&&bookid.equals(rs.getObject(1)) )
                            return true;
                }
            } catch (SQLException  e) {
                e.printStackTrace();
            }finally{
                close(rs);
                close(preparedStatement);
                close(connection);
            }
            return false;     
        }
     

    public static void main(String[] args) {
        Data a= new Data();
        //a.addbook("00","00","00","00","00","00");

    }

}

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<form action="loginjudge.jsp" method="get">
            <br>  图书管理系统  <br>
            <br> 用户名: <input type="text" name="id" /><br>
            <br> 密  码: <input type="password" name="password" /><br>
            <br>
            <br>  
            <input type="radio" name="usertype" value="reader" />读者
            <input type="radio" name="usertype" value="op" />管理员
            <br>
            <br> <input type="submit" value="登录" />  
                 <input type="reset" value="重置" />  
            <br>
</form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>管理员界面</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
    <br>
    <br>
    <input type="button" value="添加读者信息" onclick="location.href='opaddreader.jsp'" />
    <input type="button" value="添加新书信息" onclick="location.href='opaddbook.jsp'" />
    <input type="button" value="催还书目信息" onclick="location.href='opback.jsp'" />
    <br>
    <br>
    <input type="button" value="退出登录" onclick="location.href='login.jsp'" />
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>添加图书</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<form action="opaddbook2.jsp" method="get">
    <br>
    添加图书
    <br>
    <br> 图书 编号 <input type="text" name="id"  /><br>
    <br> 书   名 <input type="text" name="name" /><br>
    <br> 作   者 <input type="text" name="author" /><br>
    <br> 出 版 商 <input type="text" name="company" /><br>
    <br> 可借阅数量 <input type="text" name="number"  /><br>
    <br>
    <br>
    <br><input type="submit" value="提交" /> 
        <input type="reset" value="重置" />  <br>
    <br> <input type="button" value="返回菜单" onclick="location.href='op.jsp'" /> <br>
</form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<jsp:useBean id="util" class="test2.Data" scope="page" />
<%
String id=(String)request.getParameter("id");
String name=(String)request.getParameter("name");
String author=(String)request.getParameter("author");
String company=(String)request.getParameter("company");
String number=(String)request.getParameter("number");
String nowout="0";
if(id==""||name==""||author==""||company==""||number=="")
{
    out.print("<script language='javaScript'> alert('输入为空');window.history.back(-1);</script>");
}
else if(!util.bookidisIdRight(id)){
    out.print("<script language='javaScript'> alert('编号由数字组成');window.history.back(-1);</script>");
}
else if(util.bookexist(id)){
    out.print("<script language='javaScript'> alert('已存在该图书');window.history.back(-1);</script>");
}
else if(!util.isNumber(number)){
    out.print("<script language='javaScript'> alert('可借阅数量应为整数');window.history.back(-1);</script>");
}
else{
    util.addbook(id, name, author, company, number, nowout);
    out.print("<script language='javaScript'> alert('添加成功');</script>");
    response.setHeader("refresh", "0;url=opaddbook.jsp");
}

%>

</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>添加读者</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<form action="opaddreader2.jsp" method="get">
    <br>
    添加学生
    <br>
    <br> 学生学号 <input type="text" name="id"  /><br>
    <br> 学生姓名 <input type="text" name="name" /><br>
    <br> 性别 <input type="radio" name="sex" value="男" />男  
        <input type="radio" name="sex" value="女" />女
    <br>
    <br> 学 院 <input type="text" name="school"  /><br>
    <br>
    <br>
    <br><input type="submit" value="提交" /> 
        <input type="reset" value="重置" />  <br>
    <br> <input type="button" value="返回菜单" onclick="location.href='op.jsp'" /> <br>
</form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<jsp:useBean id="util" class="test2.Data" scope="page" />
<%
String id=(String)request.getParameter("id");
String name=(String)request.getParameter("name");
String sex=(String)request.getParameter("sex");
String school=(String)request.getParameter("school");
if(id==""||name==""||sex==null||school=="")
{
    out.print("<script language='javaScript'> alert('输入为空');window.history.back(-1);</script>");
}
else if(!util.useridisIdRight(id)){
    out.print("<script language='javaScript'> alert('学号由八位数字组成');window.history.back(-1);</script>");
}
else if(util.studentexist(id)){
    out.print("<script language='javaScript'> alert('已存在该读者');window.history.back(-1);</script>");
}
else{
    util.addreader(id, name, sex, school, id);
    out.print("<script language='javaScript'> alert('添加成功');</script>");
    response.setHeader("refresh", "0;url=opaddreader.jsp");
}

%>

</body>
</html>

<%@ page language="java"  import="java.sql.*" import="java.util.Date" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>催还书目</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test2.Data" scope="page" />
<div style="text-align: center;">
<table border="1" style="margin: auto;">
        <tr>
        <td align="center" width=10%>图书编号</td>
        <td align="center" width=10%>书籍名称</td>
        <td align="center" width=10%>借阅日期</td>
        <td align="center" width=10%>借阅人学号</td>
        <td align="center" width=10%>借阅人姓名</td>
        </tr>
        <%
        String id=(String)session.getAttribute("id");
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement1=null; 
        PreparedStatement preparedStatement2=null; 
        PreparedStatement preparedStatement3=null;
        ResultSet rs1=null;
        ResultSet rs2=null;
        ResultSet rs3=null;
        try {
            String sql = "select * from borrows";
            preparedStatement1=connection.prepareStatement(sql);
            rs1=preparedStatement1.executeQuery();
            
            String sql2 = "select * from books";
            preparedStatement2=connection.prepareStatement(sql2);
            rs2=preparedStatement2.executeQuery();
            
            String sql3 = "select * from readers";
            preparedStatement3=connection.prepareStatement(sql3);
            rs3=preparedStatement3.executeQuery();
            
            while(rs1.next()) {
                Date borrowtime = new Date(rs1.getDate(3).getTime());
                Date nowtime = new Date();
                long day=(nowtime.getTime()-borrowtime.getTime())/(24*60*60*1000);
                if(day > 90){
                %><tr><td align="center"><%=rs1.getObject(1) %></td><%
                while(rs2.next()) {
                    if(rs2.getObject(1).equals(rs1.getObject(1))){
                        %><td align="center"><%=rs2.getObject(2) %></td><%
                    }
                }
                %>
                <td align="center"><%=rs1.getObject(3) %></td>
                <td align="center"><%=rs1.getObject(2) %></td>
                <%
                while(rs3.next()) {
                    if(rs3.getObject(1).equals(rs1.getObject(2))){
                        %><td align="center"><%=rs3.getObject(2) %></td><%
                    }
                }
                %>
                </tr>
                <%
                }
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs3);
            util.close(rs1);
            util.close(rs2);
            util.close(preparedStatement1);
            util.close(preparedStatement2);
            util.close(preparedStatement3);
            util.close(connection);
        }
        %>
</table>
</div>
    <br> <input type="button" value="返回菜单" onclick="location.href='op.jsp'" /> <br>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>读者界面</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
    <br>
    <br>
    <input type="button" value="浏览图书信息" onclick="location.href='readerlookbook.jsp'" />
    <input type="button" value="查询借阅图书" onclick="location.href='readersearch.jsp'" />
    <input type="button" value="浏览催还书目" onclick="location.href='readerneedback.jsp'" />
    <input type="button" value="归还图书" onclick="location.href='readerback.jsp'" />
    <br>
    <br>
    <input type="button" value="退出登录" onclick="location.href='login.jsp'" />
</body>
</html>

<%@ page language="java"  import="java.sql.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>归还图书</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test2.Data" scope="page" />
<div style="text-align: center;">
<table border="1" style="margin: auto;">
        <tr>
        <td align="center" width=10%>编号</td>
        <td align="center" width=10%>书名</td>
        <td align="center" width=10%>作者</td>
        <td align="center" width=10%>出版商</td>
        <td align="center" width=10%>归还</td>
        </tr>
        <%
        String readerid=(String)session.getAttribute("id");
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement=null; 
        ResultSet rs=null;
        try {
            String sql = "select * from books";
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            while(rs.next()){
                if(util.readerHaveBorrow(readerid, (String)rs.getObject(1))){
                %>
                <tr>
                <td align="center"><%=rs.getObject(1) %></td>
                <td align="center"><%=rs.getObject(2) %></td>
                <td align="center"><%=rs.getObject(3) %></td>
                <td align="center"><%=rs.getObject(4) %></td>
                <td align="center"> <a style="color:white" href='readerback2.jsp?id=<%=rs.getObject(1) %>&outnow=<%=rs.getObject(6) %>'>归还</a> </td>
                </tr>
                <%
                }
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs);
            util.close(preparedStatement);
            util.close(connection);
        }
        %>
</table>
</div>
    <br> <input type="button" value="返回菜单" onclick="location.href='reader.jsp'" /> <br>
</body>
</html>

<%@ page language="java"  import="java.sql.*" import="java.util.Date" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<jsp:useBean id="util" class="test2.Data" scope="page" />
<%
String readerid=(String)session.getAttribute("id");
String bookid=(String)request.getParameter("id");
String outnow0=(String)request.getParameter("outnow");
String outnow= Integer.toString(Integer.parseInt(outnow0)-1);
long day=0;
Connection connection = util.getConnection();
PreparedStatement preparedStatement=null;
ResultSet rs=null;
try {
    String sql = "select * from borrows";
    preparedStatement=connection.prepareStatement(sql);
    rs=preparedStatement.executeQuery();
    while(rs.next()) {
        if(readerid.equals(rs.getObject(2))&&bookid.equals(rs.getObject(1))){
              Date borrowtime = new Date(rs.getDate(3).getTime());
              Date nowtime = new Date();
              day=(nowtime.getTime()-borrowtime.getTime())/(24*60*60*1000);
        }
    }
}catch (SQLException  e) {
    e.printStackTrace();
}finally{
    util.close(rs);
    util.close(preparedStatement);
    util.close(connection);
}
if(day<=90){
    util.back(readerid, bookid, outnow);
    out.print("<script language='javaScript'> alert('归还成功');</script>");
    response.setHeader("refresh", "0;url=readerback.jsp");
}
else {
    double money=(double)(day-90)*0.1;
    util.back(readerid, bookid, outnow);
    out.print("<script language='javaScript'> alert('支付成功，归还成功');</script>");
    response.setHeader("refresh", "0;url=readerback.jsp");
}
%>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>借阅图书</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test2.Data" scope="page" />
<%
String readerid=(String)session.getAttribute("id");
String bookid=(String)request.getParameter("id");
String outnow0=(String)request.getParameter("outnow");
String outnow= Integer.toString(Integer.parseInt(outnow0)+1);

if(util.readerHaveBorrow(readerid, bookid)){
    out.print("<script language='javaScript'> alert('你已经借阅了这本书');window.history.back(-1);</script>");
}
else{
    util.addborrow(readerid, bookid, outnow);
    out.print("<script language='javaScript'> alert('借阅成功');</script>");
    response.setHeader("refresh", "0;url=readersearch.jsp");
}
%>
</body>
</html>

<%@ page language="java"  import="java.sql.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>浏览图书信息</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test2.Data" scope="page" />
<div style="text-align: center;">
<table border="1" style="margin: auto;">
        <tr>
        <td align="center" width=10%>编号</td>
        <td align="center" width=10%>书名</td>
        <td align="center" width=10%>作者</td>
        <td align="center" width=10%>出版商</td>
        <td align="center" width=10%>可借阅数量</td>
        </tr>
        <%
        String userid=(String)session.getAttribute("userid");
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement=null; 
        ResultSet rs=null;
        try {
            String sql = "select * from books";
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            while(rs.next()){
                %>
                <tr>
                <td align="center"><%=rs.getObject(1) %></td>
                <td align="center"><%=rs.getObject(2) %></td>
                <td align="center"><%=rs.getObject(3) %></td>
                <td align="center"><%=rs.getObject(4) %></td>
                <td align="center"><%=rs.getObject(5) %></td>
                </tr>
                <%
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs);
            util.close(preparedStatement);
            util.close(connection);
        }
        %>
</table>
</div>
    <br> <input type="button" value="返回菜单" onclick="location.href='reader.jsp'" /> <br>
</body>
</html>

<%@ page language="java"  import="java.sql.*" import="java.util.Date" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>浏览催还书目</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test2.Data" scope="page" />
<div style="text-align: center;">
<table border="1" style="margin: auto;">
        <tr>
        <td align="center" width=10%>图书编号</td>
        <td align="center" width=10%>书籍名称</td>
        <td align="center" width=10%>借阅日期</td>
        </tr>
        <%
        String id=(String)session.getAttribute("id");
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement=null; 
        PreparedStatement preparedStatement0=null; 
        ResultSet rs1=null;
        ResultSet rs2=null;
        try {
            String sql = "select * from borrows";
            preparedStatement=connection.prepareStatement(sql);
            rs1=preparedStatement.executeQuery();
            
            String sql2 = "select * from books";
            preparedStatement0=connection.prepareStatement(sql2);
            rs2=preparedStatement0.executeQuery();
            while(rs1.next()) {
                if(id.equals((String)rs1.getObject(2))){
                Date borrowtime = new Date(rs1.getDate(3).getTime());
                Date nowtime = new Date();
                long day=(nowtime.getTime()-borrowtime.getTime())/(24*60*60*1000);
                if(day > 90){
                %><tr><td align="center"><%=rs1.getObject(1) %></td><%
                while(rs2.next()) {
                    if(rs2.getObject(1).equals(rs1.getObject(1))){
                        %><td align="center"><%=rs2.getObject(2) %></td><%
                    }
                }
                %>
                <td align="center"><%=rs1.getObject(3) %></td>
                </tr>
                <%
                }
                }
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs1);
            util.close(rs2);
            util.close(preparedStatement);
            util.close(preparedStatement0);
            util.close(connection);
        }
        %>
</table>
</div>
    <br> <input type="button" value="返回菜单" onclick="location.href='reader.jsp'" /> <br>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>缴费</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<jsp:useBean id="util" class="test2.Data" scope="page" />


</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>查询图书</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
<form action="readersearch2.jsp" method="get">
<br>
输入要查询信息的书名/作者(支持模糊查询)：
<br> <input type="text" name="data" /> <br>
    <br><input type="submit" value="提交" /> 
        <input type="reset" value="重置" />  <br>
    <br> <input type="button" value="返回菜单" onclick="location.href='reader.jsp'" /> <br>
</form>
</body>
</html>

<%@ page language="java" import="java.sql.*"  contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>查询结果</title>
</head>
<body  background="images.jpg" style="text-align:center;color:white;font-family:宋体; font-size:20px">
查询结果
<jsp:useBean id="util" class="test2.Data" scope="page" />
<%
String data=(String)request.getParameter("data");
if(data==""){
    out.print("<script language='javaScript'> alert('输入为空'); window.history.back(-1); </script>");
}
else 
{
    %>
    <div style="text-align: center;">
    <table border="1" style="margin: auto;">
                <tr>
                <td align="center" width=10%>编号</td>
                <td align="center" width=10%>书名</td>
                <td align="center" width=10%>作者</td>
                <td align="center" width=10%>出版商</td>
                <td align="center" width=10%>可借阅数量</td>
                <td align="center" width=10%>当前借出</td>
                <td align="center" width=10%>借阅</td>
                </tr>
    <% 
        int i=0;
        Connection connection = util.getConnection();
        PreparedStatement preparedStatement=null; 
        ResultSet rs=null;
        try {
            String sql= " select * from books where name like ? or author like ? ";
            preparedStatement=connection.prepareStatement(sql);
            preparedStatement.setString(1,"%"+data+"%");
            preparedStatement.setString(2,"%"+data+"%");
            rs=preparedStatement.executeQuery();
            while(rs.next())
            {
                i++;
                if((int)rs.getObject(5)>(int)rs.getObject(6)){
                %>
                <tr>
                <td align="center"><%=rs.getObject(1) %></td>
                <td align="center"><%=rs.getObject(2) %></td>
                <td align="center"><%=rs.getObject(3) %></td>
                <td align="center"><%=rs.getObject(4) %></td>
                <td align="center"><%=rs.getObject(5) %></td>
                <td align="center"><%=rs.getObject(6) %></td>
                <td align="center"> <a style="color:white" href='readerborrow.jsp?id=<%=rs.getObject(1) %>&outnow=<%=rs.getObject(6) %>'>借阅</a> </td>
                </tr>
                <%
                }
                else{
                    %>
                    <tr>
                    <td align="center"><%=rs.getObject(1) %></td>
                    <td align="center"><%=rs.getObject(2) %></td>
                    <td align="center"><%=rs.getObject(3) %></td>
                    <td align="center"><%=rs.getObject(4) %></td>
                    <td align="center"><%=rs.getObject(5) %></td>
                    <td align="center"><%=rs.getObject(6) %></td>
                    <td align="center">不可借阅</td>
                    </tr>
                    <%
                    
                }
            }
            if(i==0){
                out.print("<script language='javaScript'> alert('没有查询到有关信息'); window.history.back(-1); </script>");
            }
        } catch (SQLException  e) {
            e.printStackTrace();
        }finally{
            util.close(rs);
            util.close(preparedStatement);
            util.close(connection);
        }  
}
    %>
</table>
</div>
    <br> <input type="button" value="返回" onclick="location.href='readersearch.jsp'" /> <br>
</body>
</html>