用JSP完成图书信息查询功能

结构图

DBUtil.java代码

package org.liubingfeng.util;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;public class DBUtil {// 1:加载驱动程序static {try {Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}// 2:获取链接public static Connection getConn() {Connection conn = null;try {conn = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=practice1006","sa", "123456");} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return conn;}// 3:资源关闭public static void close(Connection conn, PreparedStatement ps, ResultSet rs) {try {if (conn != null)conn.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {if (ps != null)ps.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {if (rs != null)rs.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}
}

Book.java代码

package org.liubingfeng.bean;public class Book {/*** @param args*/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() {super();// TODO Auto-generated constructor stub}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(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;}@Overridepublic String toString() {return "<tr>"+"<td>"+id+"</td>"+"<td>"+name+"</td>"+"<td>"+isbn+"</td>"+"<td>"+price+"</td>"+"<td>"+author+"</td>"+"</tr>";}}

BookSearchServlet.java代码

package org.liubingfeng.action;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.liubingfeng.bean.Book;
import org.liubingfeng.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 {request.setCharacterEncoding("UTF-8");String bookName = request.getParameter("bookName");Book book = BookTest.getBookByName(bookName);request.setAttribute("book", book);request.getRequestDispatcher("bookInfo.jsp").forward(request, response);}}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.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>org.liubingfeng.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>

BookTest.java代码

package org.liubingfeng.test;import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;import org.liubingfeng.bean.Book;
import org.liubingfeng.util.DBUtil;public class BookTest {/*** @param args*/public static Book getBookByName(String bookName) {Connection conn = null;PreparedStatement ps = null;ResultSet rs = null;conn = DBUtil.getConn();String sql = "select * from book where name = ?";Book book = new Book();try {ps = conn.prepareStatement(sql);ps.setString(1, bookName);rs = ps.executeQuery();if (rs.next()) {book = new Book();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 {book = null;}} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}DBUtil.close(conn, ps, rs);return book;}}

search.jsp页面代码

<%@ 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><% 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页面代码

<%@page import="org.liubingfeng.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">--></head><body><%Book book = (Book) request.getAttribute("book");%><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">价格</th><th class="author">作者</th></tr><%if (book != null) {out.println(book.toString() + "<br>");} else {request.setAttribute("msg", "很抱歉,没有查询到该图书");request.getRequestDispatcher("search.jsp").forward(request,response);}%></table>
</body>
</html>

页面效果图

输入数据库内没有的图书书名

输入数据库内以存储的图书书名

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用JSP完成图书信息查询功能

目录

结构图

DBUtil.java代码

Book.java代码

BookSearchServlet.java代码

web.xml

BookTest.java代码

search.jsp页面代码

bookInfo.jsp页面代码

页面效果图

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