JavaWeb期末

目录

• DbUtil
• BookDao
• UserDao
• addBookServlet
• login.jsp
• BookList.jsp
• addBook.jsp

DbUtil

package com.hoppz.exam.Util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DbUtil {
	
	private static String url = "jdbc:mysql://localhost:3306/db_studentinfo";
	private static String name = "root";
	private static String ps = "3789xsx";
	private static String jdbcName = "com.mysql.jdbc.Driver";
	
	///背，记得连个都要 throw Exception
	public static Connection getCon() throws Exception
	{
		try {
			Class.forName(jdbcName);
		}catch( ClassNotFoundException e ){
			System.out.println("找不导类，加载失败");
			e.printStackTrace();
		}
		
		Connection con = (Connection) DriverManager.getConnection(url,name,ps);
		return con;
	}
	
	public static void closeCon(Connection con) throws Exception {
		if(con != null) {
			con.close();
		}
	}
}

BookDao

package com.hoppz.exam.Dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import com.hoppz.exam.Model.*;
import com.hoppz.exam.Util.*;
import com.sun.crypto.provider.RSACipher;

public class BookDao {
	
	private static final String Interger = null;
	
	/* 
	 * 获得表，主要用于booklist.jsp显示
	 * */
	public static List<Book> getBooklist()
	{
		List<Book> bookList = new ArrayList<Book>();
		try {
			Connection con = DbUtil.getCon();
			String sql = "select * from t_book";
			PreparedStatement pstmt = con.prepareStatement(sql);
			ResultSet rs = pstmt.executeQuery();
			
			while(rs != null && rs.next()) {
				
				String id = rs.getString("id");
				String name = rs.getString("name");
				Date date = rs.getDate("date");
				Book book = new Book(id,name,date);
				System.out.println(id + name + date);
				bookList.add(book);
				
			}
			///一定要记得关！！
			DbUtil.closeCon(con);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return bookList;
	}
	/*
	 * 添加图书，用于addBook.jsp
	 * */
	public static boolean addBook(Book book)
	{
		String sql=" insert into t_book(id,name,date) values(?,?,?)";
		String check="select * from t_book where id=?";
		boolean flag = false;
		try {
			///检查这个书是不是已经存在了
			Connection con = DbUtil.getCon();
			PreparedStatement ps = con.prepareStatement(check);
			ps.setString(1,book.getId());
			ResultSet qrs = ps.executeQuery();
			if(qrs.next()) {
				flag = false;
			}
			else {
				///将UtilDate 转化为 SQlDate ，不然无法插入
				java.sql.Date sqlDate = new java.sql.Date(book.getDate().getTime());
				PreparedStatement pstmt = con.prepareStatement(sql);
				pstmt.setString(1,book.getId());
				pstmt.setString(2,book.getName());
				pstmt.setDate(3, sqlDate);
				
				pstmt.executeUpdate();
				flag = true;;
			}
			///一定要记得关！！
			DbUtil.closeCon(con);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		if(flag) return true;
		else return false;
	}
	
	/*
	 * 用于删除
	 * */
	public static boolean deleteBook(int id) {
		
		String sql = "delete from t_book where id=?";
		String check="select * from t_book where id=?";
		boolean flag = false;
		
		try {
			Connection con = DbUtil.getCon();
			PreparedStatement ps = con.prepareStatement(check);
			ps.setInt(1,id);
			
			ResultSet qrs = ps.executeQuery();
			if(qrs.next()) {
				flag = true;
				PreparedStatement pstmt = con.prepareStatement(sql);
				pstmt.setInt(1,id);
				
				pstmt.executeUpdate();
			}
			///一定要记得关！！
			DbUtil.closeCon(con);
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		if(flag) {
			return true;
		}
		else return false;
		
	}
	
}

UserDao

package com.hoppz.exam.Dao;

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

import com.hoppz.exam.Model.User;
import com.hoppz.exam.Util.DbUtil;

public class UserDao {

	public boolean getUser(User user) throws Exception{
		
		DbUtil db = new DbUtil();
		Connection con = db.getCon();
		User rsUser = null;
		Boolean flag = false;
		
		String sql = "select * from t_user where userName=? and password=?";
		//重要，有点难背
		PreparedStatement pstmt = con.prepareStatement(sql);
		
		pstmt.setString(1,user.getUserName());
		pstmt.setString(2,user.getPassWord());
		ResultSet rs = pstmt.executeQuery();
		
		if(rs.next()) {
			return flag = true;
		}
		DbUtil.closeCon(con);
		
		if(flag) {
			return true;
		}
		else return false;
	}
}

addBookServlet

package com.hoppz.exam.Servlet;

import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.hoppz.exam.Dao.BookDao;
import com.hoppz.exam.Model.Book;

/**
 * Servlet implementation class AddBookServlet
 */
@WebServlet("/AddBookServlet")
public class AddBookServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request,response);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		System.out.println(233);///其他也有这个主要是用来我看跳转进来没有233
		String id = request.getParameter("addBook_id");
		String name = request.getParameter("addBook_name");
		String stringDate = request.getParameter("addBook_date");
		
		///String to Date
		SimpleDateFormat format = new SimpleDateFormat("yyyy-mm-dd");
		Date date = null;
		try {
			date = format.parse(stringDate);
		}catch(ParseException e) {
			e.printStackTrace();
		}
		
		Book book = new Book(id,name,date);
		///
		BookDao bookDao = new BookDao();
		
		if( bookDao.addBook(book) ) {
			response.sendRedirect("booklist.jsp");
		}
		else {
			System.out.println("图书已存在");
			response.sendRedirect("addBook.jsp");
		}
	}

}

login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c"  uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>login</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.1/css/bulma.min.css">

</head>
<body>
	
	<br/>
	<div class ="columns">
		
		<div class = "column is-4">
		</div>
		<div class = "column is-4">
			<!--  -->
			<form class = "box" action = "login" method = "post">
				<div class = "field">
					<label class = "label">UserName</label>
					<div class = "control" >
						<input class = "input" type = "text" name ="login_username">
					</div>
				</div>
				
				<div class = "field">
					<label class="label">PassWord</label>
					<div class = "control">
						<input class = "input" type = "password" name ="login_password">
					</div>
				</div>
				<button class = "button is-primary">Login</button>
			</form>
			
			
			
			<!--  -->
		</div>
		<div class = "colunm is-4" >
		</div>
		
	</div>
	
	
</body>
</html>

BookList.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c"  uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>booklist</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.1/css/bulma.min.css">

<%
	String name = (String)session.getAttribute("currentName");
	if( name == null ){
		response.sendRedirect("login.jsp");
	}
%>
<!-- 最好用page import -->
<%@ page import ="com.hoppz.exam.Dao.BookDao" %>
<%@ page import ="com.hoppz.exam.Model.Book"%>
<%@ page import ="java.util.List" %>
<%
	List<Book> booklist = BookDao.getBooklist();
	session.setAttribute("currentBook",booklist);
%>

<script>

function submitForm2(bookid){
	//document.getElementById("test").innerHTML=bookname;
	var url =  'deleteBook?id=' + bookid;
	//window.location.href="DeleteServlet?sid="+sid;
	
	 location.href = url;

}

function check(bookid,bookname){
	var flag = confirm("确定要删除<"+bookname+">吗?");
	if(flag){
		submitForm2(bookid);
	}
}

</script>

</head>
<body>
	
	<section class="hero is-primary">
		<div class = "hero-body">
			<p class = "title">欢迎  ${sessionScope.currentName}</p>
		</div>
	</section>
	<div class="columns">
		<div class="column is-4"></div>
		<div class="column">
			<table class="table is-striped is-fullwidth is-hoverable">
				<thead>
					<tr>
						<td>id</td>
						<td>name</td>
						<td>publicTime</td>
						<td>deleteOp</td>
					</tr>
				</thead>
				<tbody>
					<c:forEach items="${sessionScope.currentBook}" var = "bookItem" varStatus = "st">
						<tr>
							<td>${bookItem.id}</td>
							<td>${bookItem.name}</td>
							<td>${bookItem.date}</td>
							
							<!-- 注意onclick里面的EL表达式要加' ' 才能转换为js的string类型 -->
							
							<td><button class = "button" onclick="check(${bookItem.id} ,'${bookItem.name}')" >delete</button>
						</tr>
					</c:forEach>
				</tbody>
			</table>
			<a href ="addBook.jsp">addBook</a> 
			<!-- <div id = "test">233</div>  -->
		</div>
		<div class="column is-4"></div>
		
	</div>
	
	
</body>
</html>

addBook.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c"  uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.1/css/bulma.min.css">
<title>Insert title here</title>

<%
	String name = (String)session.getAttribute("currentName");
	if( name == null ){
		response.sendRedirect("login.jsp");
	}
%>

<script>
var xmlHttpReq = null;
/*	用这种方式去访问servlet有问题
function postRequest(){
	
	if(window.XMLHttpRequest){
		xmlHttpReq = new XMLHttpRequest();
	}else if(window.ActionXObject){
		xmlHttpReq = new ActiveXOject("Microsft.XMLHTTP");
	}
	
	///获取
	var id = document.getElementById("addBook_id").value;
	var name = document.getElementById("addBook_name").value;
	var date = document.getElementById("addBook_date").value;
	document.getElementById("myDiv").innerHTML=id+name+date;
	var url = "http://localhost:8081/ExamDemo/addbook"
	
	xmlhttp.open("POST",url,true);
	xmlhttp.send("id="+id+"&name="+name+"&date="+date);
}

*/
</script>

</head>


 
<body>
	
	<section class="hero is-primary">
		<div class = "hero-body">
			<p class = "title">欢迎  ${sessionScope.currentName}</p>
		</div>
	</section>
	<div class="columns">
		<div class = "column is-4"></div>
		<div class = "column is-4">
			
			<form class = "form" method = "post" action = "addbook">
				<div class = "field">
					<label class = "label">BookId</label>
					<input class="input" type = "text" name = "addBook_id" id = "addBook_id">
				</div>
				
				<div class = "field">
					<label class = "label">BookName</label>
					<input class="input" type = "text" name = "addBook_name" id = "addBook_name">
				</div>
				 
				 <div class = "field">
					<label class = "label">PublicationDate</label>
					<input class="input" type = "date" name = "addBook_date"  id = "addBook_date"  placeholder="select date">
				</div>
				<!-- 如果不写 type="button" 每次点button页面就会自动刷新一次 ,如果写了type = "button"那么就不能重form-action上提交数据到servlet -->
				<button  class = "button is-primary"  >submit</button>
			</form>
			
		</div>
		<div  class = "column is-4" id ="myDiv">
		</div>
		
	</div>
	
</body>
</html>