用JSP完成简单的图书信息查询系统

信息查询系统"/>

用JSP完成简单的图书信息查询系统

目录

• 图书信息查询系统
• 分层结构
• • util包
  • • DButil代码
  • bean包
  • • Book.java代码
  • action包
  • • BookSearchServlet.java代码
    • web.xml配置
  • test包
  • • BookTest.java代码
  • WebRoot下jsp页面
  • • search.jsp页面
    • bookInfo.jsp页面
  • book表数据
• 浏览器效果
• • search.jsp页面

图书信息查询系统

分层结构

util包

DButil代码

package top.xinsir.util;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;public class DBUtil {static{try {Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public static Connection getConn(){Connection conn = null;try {conn = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=MyDB", "sa", "1");} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return conn;}public static void close(Connection conn,PreparedStatement ps,ResultSet rs){try {if(conn!=null)conn.close();if(ps!=null)ps.close();if(rs!=null)rs.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}
}

bean包

Book.java代码

package top.xinsir.bean;public class Book {private Integer id;private String name;private String isbn;private Float price;private String author;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getIsbn() {return isbn;}public void setIsbn(String isbn) {this.isbn = isbn;}public Float getPrice() {return price;}public void setPrice(Float price) {this.price = price;}public String getAuthor() {return author;}public void setAuthor(String author) {this.author = author;}public Book(Integer id, String name, String isbn, Float price, String author) {super();this.id = id;this.name = name;this.isbn = isbn;this.price = price;this.author = author;}public Book(String name, String isbn, Float price, String author) {super();this.name = name;this.isbn = isbn;this.price = price;this.author = author;}public Book() {super();// TODO Auto-generated constructor stub}@Overridepublic String toString() {return "<tr>"+"<td>"+id+"</td>"+"<td>"+name+"</td>"+"<td>"+isbn+"</td>"+"<td>"+price+"</td>"+"<td>"+author+"</td>"+"</tr>";}
}

action包

BookSearchServlet.java代码

package top.xinsir.action;import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import top.xinsir.bean.Book;
import top.xinsir.test.BookTest;public class BookSearchServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// 设置编码request.setCharacterEncoding("UTF-8");// 获取参数String bookName = request.getParameter("bookName");// 获取传递过来的Book对象Book book = BookTest.getBookByName(bookName);// 将图书信息显示在bookInfo.jsp页面request.setAttribute("book", book);request.getRequestDispatcher("bookInfo.jsp").forward(request, response);}}

web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="" xmlns:xsi="" xsi:schemaLocation=" .xsd"><display-name></display-name><servlet><description>This is the description of my J2EE component</description><display-name>This is the display name of my J2EE component</display-name><servlet-name>BookSearchServlet</servlet-name><servlet-class>top.xinsir.action.BookSearchServlet</servlet-class></servlet><servlet-mapping><servlet-name>BookSearchServlet</servlet-name><url-pattern>/bookSearch</url-pattern></servlet-mapping>	<welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list>
</web-app>

test包

BookTest.java代码

package top.xinsir.test;import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;import top.xinsir.bean.Book;
import top.xinsir.util.DBUtil;public class BookTest {public static Book getBookByName(String bookName){// 连接数据库并且把数据查询出来 存储在book对象中，最后返回book对象即可Connection conn = null;PreparedStatement ps = null;ResultSet rs = null;// 查询代码conn = DBUtil.getConn();// 加载驱动String sql = "select * from book where name=?";//准备sql语句Book book = new Book();// 实例化Book对象try {ps = conn.prepareStatement(sql);// 设置值ps.setString(1, bookName);rs = ps.executeQuery();if(rs.next()){// 如果判断查询到值得话赋值到book对象中book = new Book();// 重新实例化Book对象// 设置book里的值book.setId(rs.getInt("id"));book.setName(rs.getString("name"));book.setIsbn(rs.getString("isbn"));book.setPrice(rs.getFloat("price"));book.setAuthor(rs.getString("author"));}else{// 如果没有查询到内容给的话book为空值book = null;}} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}// 关闭资源DBUtil.close(conn, ps, rs);// 返回book对象return book;}
}

WebRoot下jsp页面

search.jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>"><title>My JSP 'search.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><%// 如果没有该图书返回一个msg值 接收该值String msg = (String)request.getAttribute("msg");if(msg==null)msg="";%><form action="bookSearch" method="post">图书名称:<input type="text" name="bookName" /><span style="color: red"><%=msg %></span><br><input type="submit" value="查询" /></form></body>
</html>

bookInfo.jsp页面

<%@page import="top.xinsir.bean.Book"%>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%String path = request.getContextPath();String basePath = request.getScheme() + "://"+ request.getServerName() + ":" + request.getServerPort()+ path + "/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>"><title>My JSP 'bookInfo.jsp' starting page</title><meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--<link rel="stylesheet" type="text/css" href="styles.css">--><style type="text/css">table{margin: 0 auto;}h1{text-align: center;color: red;}td{text-align: center;}.id,.price{width: 60px;}.name,.author{width: 100px;}.isbn{width: 250px;}</style>
</head><body><%// 接收Book值Book book = (Book) request.getAttribute("book");// 如果book的值不是空值得话 打印出来图书信息%><h1>查询结果</h1><table border="1" cellpadding="0" cellspacing="0"><tr><th class="id">id</th><th class="name">书籍名称</th><th class="isbn">ISBN</th><th class="price">价钱</th><th class="author">作者</th></tr><%if (book != null) {out.println(book.toString() + "<br>");} else {// 如果为空值的话说明没有这个图书信息request.setAttribute("msg", "很抱歉,没有查询到该图书");// 继续转发到search.jsp页面request.getRequestDispatcher("search.jsp").forward(request,response);}%></table>
</body>
</html>

book表数据

浏览器效果

search.jsp页面

输入数据库没有的数据之后

点击查询

输入数据库中已有的数据之后

点击查询之后

这样一个图书查询系统就算完成了