图书管理系统

web作业，，来记录一下,，代码量没有多少，挺好写的。

增加了一个下架图书功能，，当flag为1时，，显示在当前页面中，flag为0时，，，不显示，，点击下架图书时显示。

 

 

 

 bookInfo.java

package beans;

import java.sql.*;
public class bookInfo {
	private String driverStr="com.mysql.jdbc.Driver";
	private String connStr="jdbc:mysql://localhost:3306/book?characterEncoding=gb2312";//数据库名
    private String dbusername="root";
    private String dbpassword="sa";//密码和数据库一致 
    private Connection conn=null;
    private Statement stmt=null;
public bookInfo()
{
	try{
		Class.forName(driverStr);
		conn=DriverManager.getConnection(connStr,dbusername, dbpassword);
		stmt=conn.createStatement();
	}
	catch(Exception ex){System.out.println("无法同数据库建立连接！");}
}
public int executeUpdate(String s)
{
    int result=0;
    try{result=stmt.executeUpdate(s);}
    catch(Exception ex){System.out.println("执行更新错误！");}
    return result;
}
public ResultSet executeQuery(String s)
{
	ResultSet rs=null;
	try{rs=stmt.executeQuery(s);}
	catch(Exception ex){System.out.println("执行查询错误！");}
	return rs;
}
public void close()
{
	try{
		stmt.close();
		conn.close();
	}
	catch(Exception e){}
}
 
}

index.jsp

<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="UTF-8" import="java.sql.*"%>







   
   

   
	增加图书信息   
	查看下架图书
	
	");
	}
	}
	rs.close();
	db.close();
	%>
	

	
书名
作者
价格
管理
	
	
	<%
	String s="select * from book_info";
	ResultSet rs=db.executeQuery(s);
	while(rs.next())
	{
	int flag=rs.getInt(5);
	if(flag==1)
	{
	int id=rs.getInt(1);
	out.println("
"+rs.getString(2)+"
"+rs.getString(3)+"
"+rs.getString(4)+"
删除 修改 下架
	

add.jsp

<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="UTF-8" import="java.sql.*"%>







  


添加图书信息
  

    
书名：
    

  
  

    
作者：
    

  
  

    
价格：
    
元
  
  

    

    
    
    
  



<%
request.setCharacterEncoding("gb2312");
String submit=request.getParameter("submit");
if(submit!=null&&!submit.equals(""))
{
	String  bookname=request.getParameter("bookname");
	String  author=request.getParameter("author");
	String  price=request.getParameter("price");
	String sql="insert into book_info(bookname,author,price) values('"+bookname+"','"+author+"',"+price+")";
	int i=db.executeUpdate(sql);
	if(i!=-1)
	{
	out.println("");
	response.setHeader("refresh","1;url=index.jsp");
	}
	else{
	out.println("");
	response.setHeader("refresh","1;url=add.jsp");
	}
	db.close();
}
%>

del.jsp

<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="UTF-8" import="java.sql.*" %>







  
	<%
	request.setCharacterEncoding("gb2312");
	String id=request.getParameter("id");
	String sql="delete from book_info where id="+id;
	int i=db.executeUpdate(sql);
	if(i==1)
		{out.println("");
		response.setHeader("refresh","1;url=index.jsp");
		}
		else{
		out.println("");
		response.setHeader("refresh","1;url=del.jsp");
		}
     db.close();
	%>

 edit.jsp

<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="UTF-8" import="java.sql.*"%>







  
  <%
  request.setCharacterEncoding("gb2312");
  String id=request.getParameter("id");
  ResultSet rs=db.executeQuery("select * from book_info where id="+id);
  rs.next();
   %>
   

   

     

	  
修改图书信息
	  

	        
书名：
               

               
           
	  

	    
作者：
	    

	  
	  

	    
价格：
	    
元
	  
	  

	    

	    
	    
	    
	    
	  
	
	

<%
  db.close();
 %>

update.jsp

<%@ page language="java" contentType="text/html; charset=gb2312" import="java.sql.*" errorPage="error.jsp"%>

  
    
 
  
   
  <%
  request.setCharacterEncoding("gb2312");
  String bookname=request.getParameter("bookname");
  String author=request.getParameter("author");  
  String price=request.getParameter("price");  
  String id=request.getParameter("id"); 
  String sql="update book_info set bookname='"+bookname+"',author='"+author+"',price="+price+" where id="+id; 
  int i=db.executeUpdate(sql);
	if(i==1)
	{out.println("");
	response.setHeader("refresh","1;url=index.jsp");
	return;
	}
  db.close();
   %>
  

 xiajiacaozuo.jsp

<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="UTF-8" import="java.sql.*" %>







  
	<%
	request.setCharacterEncoding("gb2312");
	String id=request.getParameter("id");
	String sql="update book_info set flag=0 where id="+id;
	int i=db.executeUpdate(sql);
	if(i==1)
		{out.println("");
		response.setHeader("refresh","1;url=index.jsp");
		}
		else{
		out.println("");
		response.setHeader("refresh","1;url=recycle.jsp");
		}
     db.close();
	%>

trash.jsp

<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="UTF-8" import="java.sql.*"%>







   
   

	下架的图书");
	}
	}
	rs.close();
	db.close();
	%>
	

	

	
书名
作者
价格
管理
	
	
	<%
	String s="select * from book_info";
	ResultSet rs=db.executeQuery(s);
	while(rs.next())
	{
	int flag=rs.getInt(5);
	if(flag==0)
	{
	int id=rs.getInt(1);
	out.println("
"+rs.getString(2)+"
"+rs.getString(3)+"
"+rs.getString(4)+"
上架
	

shangjiacaozuo.jsp

<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="UTF-8" import="java.sql.*" %>







  
	<%
	request.setCharacterEncoding("gb2312");
	String id=request.getParameter("id");
	String sql="update book_info set flag=1 where id="+id;
	int i=db.executeUpdate(sql);
	if(i==1)
		{out.println("");
		response.setHeader("refresh","1;url=index.jsp");
		}
		else{
		out.println("");
		response.setHeader("refresh","1;url=recycle.jsp");
		}
     db.close();
	%>