java第05次作业

java/com/dao/BookDao.java

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+package com.dao;
+
+import java.sql.*;
+import javax.sql.*;
+import javax.naming.*;
+import com.demo.BookBean;
+
+public class BookDao {
+    private static InitialContext context = null;
+    private DataSource dataSource = null;
+    
+    public BookDao() {
+        try {
+            if (context == null) {
+                context = new InitialContext();
+            }
+            dataSource = (DataSource)context.lookup("java:comp/env/jdbc/demo");
+        } catch (NamingException e) {
+            e.printStackTrace();
+        }
+    }
+    
+    // 根据书号查询图书信息
+    public BookBean searchBook(String bookid) {
+        Connection dbconn = null;
+        PreparedStatement pstmt = null;
+        ResultSet rst = null;
+        BookBean book = new BookBean();
+        
+        try {
+            dbconn = dataSource.getConnection();
+            pstmt = dbconn.prepareStatement("SELECT * FROM books WHERE bookid=?");
+            pstmt.setString(1, bookid);
+            rst = pstmt.executeQuery();
+            
+            if (rst.next()) {
+                book.setBookid(rst.getString("bookid"));
+                book.setTitle(rst.getString("title"));
+                book.setAuthor(rst.getString("author"));
+                book.setPublisher(rst.getString("publisher"));
+                book.setPrice(rst.getDouble("price"));
+                return book;
+            } else {
+                return null;
+            }
+        } catch (SQLException se) {
+            se.printStackTrace();
+            return null;
+        } finally {
+            try {
+                if (rst != null) rst.close();
+                if (pstmt != null) pstmt.close();
+                if (dbconn != null) dbconn.close();
+            } catch (SQLException se) {
+                se.printStackTrace();
+            }
+        }
+    }
+    
+    // 插入一本图书记录
+    public boolean insertBook(BookBean book) {
+        Connection dbconn = null;
+        PreparedStatement pstmt = null;
+        
+        try {
+            dbconn = dataSource.getConnection();
+            pstmt = dbconn.prepareStatement("INSERT INTO books VALUES(?,?,?,?,?)");
+            pstmt.setString(1, book.getBookid());
+            pstmt.setString(2, book.getTitle());
+            pstmt.setString(3, book.getAuthor());
+            pstmt.setString(4, book.getPublisher());
+            pstmt.setDouble(5, book.getPrice());
+            
+            int result = pstmt.executeUpdate();
+            return result > 0;
+        } catch (SQLException se) {
+            se.printStackTrace();
+            return false;
+        } finally {
+            try {
+                if (pstmt != null) pstmt.close();
+                if (dbconn != null) dbconn.close();
+            } catch (SQLException se) {
+                se.printStackTrace();
+            }
+        }
+    }
+}

java/com/demo/BookBean.java

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+package com.demo;
+
+public class BookBean {
+    // 定义私有属性
+    private String bookid;
+    private String title;
+    private String author;
+    private String publisher;
+    private double price;
+
+    // 无参数构造方法
+    public BookBean() {
+    }
+
+    // 带参数构造方法
+    public BookBean(String bookid, String title, String author, String publisher, double price) {
+        this.bookid = bookid;
+        this.title = title;
+        this.author = author;
+        this.publisher = publisher;
+        this.price = price;
+    }
+
+    // Getter和Setter方法
+    public String getBookid() {
+        return bookid;
+    }
+
+    public void setBookid(String bookid) {
+        this.bookid = bookid;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    public String getPublisher() {
+        return publisher;
+    }
+
+    public void setPublisher(String publisher) {
+        this.publisher = publisher;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        this.price = price;
+    }
+}

java/com/demo/BookInsertServlet.java

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+package com.demo;
+
+import java.io.*;
+import javax.servlet.*;
+import javax.servlet.http.*;
+import com.demo.BookBean;
+import com.dao.BookDao;
+import javax.servlet.annotation.WebServlet;
+
+@WebServlet("/BookInsertServlet")
+public class BookInsertServlet extends HttpServlet {
+    public void doPost(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        // 设置请求和响应的字符编码
+        request.setCharacterEncoding("UTF-8");
+        response.setCharacterEncoding("UTF-8");
+        response.setContentType("text/html;charset=UTF-8");
+        
+        String message = null;
+        try {
+            // 获取并验证请求参数
+            String bookid = request.getParameter("bookid");
+            String title = request.getParameter("title");
+            String author = request.getParameter("author");
+            String publisher = request.getParameter("publisher");
+            String priceStr = request.getParameter("price");
+            
+            // 参数验证
+            if (bookid == null || title == null || author == null || 
+                publisher == null || priceStr == null || 
+                bookid.trim().isEmpty() || title.trim().isEmpty() || 
+                author.trim().isEmpty() || publisher.trim().isEmpty() || 
+                priceStr.trim().isEmpty()) {
+                message = "请填写完整的图书信息！";
+                request.setAttribute("result", message);
+                request.getRequestDispatcher("/bookInsert.jsp").forward(request, response);
+                return;
+            }
+            
+            float price = Float.parseFloat(priceStr);
+            
+            // 创建图书对象
+            BookBean book = new BookBean(bookid, title, author, publisher, price);
+            BookDao bookdao = new BookDao();
+            boolean success = bookdao.insertBook(book);
+            
+            message = success ? "成功插入一条记录！" : "插入记录错误！";
+            
+        } catch (NumberFormatException e) {
+            message = "价格格式不正确！";
+        } catch (Exception e) {
+            message = "系统错误：" + e.getMessage();
+            e.printStackTrace();
+        }
+        
+        request.setAttribute("result", message);
+        request.getRequestDispatcher("/bookInsert.jsp").forward(request, response);
+    }
+    
+    public void doGet(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        doPost(request, response);
+    }
+}

java/com/demo/BookQueryServlet.java

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+package com.demo;
+
+import java.io.IOException;
+import javax.servlet.*;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.*;
+import java.sql.*;
+
+@WebServlet("/BookQueryServlet")
+public class BookQueryServlet extends HttpServlet {
+    private static final long serialVersionUID = 1L;
+    
+    // 数据库连接信息常量
+//    private static final String DB_URL = "jdbc:mysql://47.242.181.61:33060/demo?useSSL=false&serverTimezone=UTC";
+    private static final String DB_URL = "jdbc:mysql://47.242.181.61:33060/demo?useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true";
+    private static final String DB_USER = "root";
+    private static final String DB_PASSWORD = "lotus";
+
+    protected void doPost(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        
+        String bookid = request.getParameter("bookid");
+        if (bookid == null || bookid.trim().isEmpty()) {
+            request.setAttribute("error", "图书ID不能为空");
+            request.getRequestDispatcher("/error.jsp").forward(request, response);
+            return;
+        }
+
+        try (Connection conn = getConnection();
+             PreparedStatement pstmt = conn.prepareStatement("SELECT * FROM books WHERE bookid = ?");
+        ) {
+            pstmt.setString(1, bookid);
+            
+            try (ResultSet rst = pstmt.executeQuery()) {
+                if (rst.next()) {
+                    BookBean book = new BookBean();
+                    book.setBookid(rst.getString("bookid"));
+                    book.setTitle(rst.getString("title"));
+                    book.setAuthor(rst.getString("author"));
+                    book.setPrice(rst.getFloat("price"));
+                    book.setPublisher(rst.getString("publisher"));
+                    
+                    request.setAttribute("book", book);
+                    request.getRequestDispatcher("/displayBook.jsp").forward(request, response);
+                } else {
+                    request.setAttribute("error", "未找到ID为 " + bookid + " 的图书");
+                    request.getRequestDispatcher("/error.jsp").forward(request, response);
+                }
+            }
+        } catch (Exception e) {
+            String errorMsg = "数据库操作失败: " + e.getMessage();
+            log(errorMsg, e);
+            request.setAttribute("error", errorMsg);
+            request.getRequestDispatcher("/error.jsp").forward(request, response);
+        }
+    }
+    
+    private Connection getConnection() throws SQLException, ClassNotFoundException {
+        Class.forName("com.mysql.cj.jdbc.Driver");
+        return DriverManager.getConnection(DB_URL, DB_USER, DB_PASSWORD);
+    }
+}

java/com/demo/BookQueryServlet2.java

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+package com.demo;
+
+import java.io.*;
+import java.sql.*;
+import javax.servlet.*;
+import javax.servlet.http.*;
+import com.demo.BookBean;
+import javax.sql.DataSource;
+import javax.naming.*;
+import javax.servlet.annotation.WebServlet;
+
+@WebServlet("/BookQueryServlet2")
+public class BookQueryServlet2 extends HttpServlet {
+    /**
+	 * 
+	 */
+	private static final long serialVersionUID = 1L;
+	Connection dbconn;
+
+    public void init() {
+        try {
+            Context context = new InitialContext();
+            DataSource ds = (DataSource)context.lookup("java:comp/env/jdbc/demo");
+            dbconn = ds.getConnection();
+        } catch(NamingException ne) {
+            log("数据源查找失败: " + ne);
+        } catch(SQLException se) {
+            log("数据库连接失败: " + se);
+        }
+    }
+
+    public void doPost(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        String bookid = request.getParameter("bookid");
+        try {
+            String sql = "SELECT * FROM books WHERE bookid = ?";
+            PreparedStatement pstmt = dbconn.prepareStatement(sql);
+            pstmt.setString(1, bookid);
+            ResultSet rst = pstmt.executeQuery();
+            
+            if (rst.next()) {
+                BookBean book = new BookBean();
+                book.setBookid(rst.getString("bookid"));
+                book.setTitle(rst.getString("title"));
+                book.setAuthor(rst.getString("author"));
+                book.setPrice(rst.getDouble("price"));
+                book.setPublisher(rst.getString("publisher"));
+                request.getSession().setAttribute("book", book);
+                response.sendRedirect("/helloweb/displayBook.jsp");
+            } else {
+                response.sendRedirect("/helloweb/error.jsp");
+            }
+            
+            rst.close();
+            pstmt.close();
+        } catch(SQLException e) {
+            e.printStackTrace();
+            response.sendRedirect("/helloweb/error.jsp");
+        }
+    }
+
+    public void destroy() {
+        try {
+            if (dbconn != null && !dbconn.isClosed()) {
+                dbconn.close();
+            }
+        } catch(Exception e) {
+            e.printStackTrace();
+        }
+    }
+}

java/com/demo/BookQueryServlet3.java

@@ -0,0 +1,52 @@
+package com.demo;
+
+import java.io.*;
+import javax.servlet.*;
+import javax.servlet.http.*;
+import com.demo.BookBean;
+import com.dao.BookDao;
+import javax.servlet.annotation.WebServlet;
+
+@WebServlet("/BookQueryServlet3")
+public class BookQueryServlet3 extends HttpServlet {
+    
+    public void doPost(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        // 设置请求和响应的字符编码
+        request.setCharacterEncoding("UTF-8");
+        response.setCharacterEncoding("UTF-8");
+        
+        // 获取请求参数
+        String bookid = request.getParameter("bookid");
+        
+        // 参数验证
+        if (bookid == null || bookid.trim().isEmpty()) {
+            response.sendRedirect("/helloweb/errorPage.jsp");
+            return;
+        }
+        
+        try {
+            // 查询图书信息
+            BookDao bookdao = new BookDao();
+            BookBean book = bookdao.searchBook(bookid);
+            
+            if (book != null) {
+                // 将图书信息存储在会话中
+                request.getSession().setAttribute("book", book);
+                response.sendRedirect("/helloweb/displayBook.jsp");
+            } else {
+                response.sendRedirect("/helloweb/errorPage.jsp");
+            }
+        } catch (Exception e) {
+            // 记录异常信息
+            e.printStackTrace();
+            response.sendRedirect("/helloweb/errorPage.jsp");
+        }
+    }
+    
+    // 处理GET请求
+    public void doGet(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        doPost(request, response);
+    }
+}

webapp/META-INF/context.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<Context reloadable="true">
+    <Resource
+        name="jdbc/demo"
+        type="javax.sql.DataSource"
+        maxActive="4"
+        maxIdle="2"
+        username="root"
+        maxWait="5000"
+        driverClassName="com.mysql.cj.jdbc.Driver"
+        password="lotus"
+        url="jdbc:mysql://47.242.181.61:33060/demo?useSSL=false&amp;serverTimezone=UTC&amp;allowPublicKeyRetrieval=true"/>
+</Context>

webapp/application.jsp

@@ -0,0 +1,21 @@
+<%@ page contentType="text/html;charset=gb2312" %>
+<% 
+  int number = 0;
+  Integer num =(Integer)application.getAttribute("num");
+  if(num==null){
+    application.setAttribute("num",new Integer(number));
+  }
+  else{
+    number = num.intValue()+1;
+    application.setAttribute("num",new Integer(number));
+  }
+ %>
+<html><head><title>application example</title></head>
+<body>
+<center><font color="#0000ff" size="5">application对象示例</font>
+</center>
+<hr>
+本页面文件的实际路径是：<br><%=application.getRealPath("application.jsp") %><br>
+application对象中变量num的值为：<%=application.getAttribute("num") %>
+</body>
+</html>

webapp/bookInsert.jsp

@@ -0,0 +1,21 @@
+<%@ page contentType="text/html; charset=gb2312" %>
+<html><head> <title>Book Insert</title>
+</head>
+<body>
+<h3>请输入图书信息：</h3>
+<% if(request.getAttribute("result")!=null)
+     out.print(request.getAttribute("result"));
+%>
+<form action = "bookinsert.do" method = "post">
+ <table>
+  <tr><td>书号</td> <td><input type="text" name="bookid" ></td></tr>
+  <tr><td>书名</td><td><input type="text" name="title"></td></tr>      
+  <tr><td>作者</td><td><input type="text" name="author" ></td></tr>
+  <tr><td>出版社</td><td><input type="text" name="publisher" ></td></tr>
+  <tr><td>单价</td><td><input type="text" name="price" ></td></tr>
+  <tr><td><input type="submit" value="确定" ></td>
+      <td><input type="reset" value="重置" ></td>
+  </tr>
+</table>
+</form>
+</body></html>

webapp/bookQuery.jsp

@@ -0,0 +1,13 @@
+<%@ page language="java" contentType="text/html; charset=UTF-8"
+    pageEncoding="UTF-8"%>
+<html>
+<head><title>图书查询</title></head>
+<body>
+ <form action = "BookQueryServlet" method="post">
+  请输入书号：
+  <input type = "text" name="bookid" size="15">
+  <input type = "submit" value = "确定">
+ </form>
+<p><a href="BookQueryServlet" >查询所有图书</a></p>
+</body>
+</html>

webapp/displayBook.jsp

@@ -0,0 +1,23 @@
+<%@ page contentType="text/html; charset=gb2312" %>
+<%@ page import=" com.demo.BookBean"%>
+<jsp:useBean id="book" class="com.demo.BookBean" scope="session" />
+
+<html><body>
+<table border="0">
+<tr><td>书号:</td>
+<td><jsp:getProperty name="book" property="bookid"/></td>
+</tr>	
+  <tr><td>书名: </td>
+<td><jsp:getProperty name="book" property="title"/></td>
+</tr>
+<tr><td>作者:</td>
+<td><jsp:getProperty name="book" property="author"/></td>
+</tr>
+<tr><td>出版社:</td>
+<td><jsp:getProperty name="book" property="publisher"/></td>
+</tr>
+<tr><td>价格:</td>
+<td><jsp:getProperty name="book" property="price"/></td>
+</tr>
+</table>
+</body></html>

webapp/error.jsp

@@ -0,0 +1,4 @@
+<%@ page contentType="text/html; charset=gb2312" %>
+<html><body>
+  该书不存在。<a href="/helloweb/bookQuery.jsp">返回</a>
+</body></html>

webapp/expection.jsp

@@ -0,0 +1,23 @@
+<%@ page contentType="text/html;charset=gb2312" %>
+<%@ page isErrorPage="true" %>
+<%@ page import="java.io.*" %>
+
+<html>
+<head><title>Exception Example</title></head>
+<body>
+<p>exception变量使用示例</p>
+<hr size='0'>
+<font color="#ff0000" size="-1">
+发生了下面错误<br>
+<% 
+  exception.printStackTrace();
+  StringWriter sout = new StringWriter();
+  PrintWriter pout = new PrintWriter(sout);
+  exception.printStackTrace(pout);
+ %>
+ <pre>
+   <%= sout.toString() %>
+ </pre>
+ 
+</body>
+</html>

webapp/insertBook.jsp

@@ -0,0 +1,27 @@
+<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="UTF-8">
+    <title>图书信息插入</title>
+</head>
+<body>
+    <h2>图书信息录入</h2>
+    <form action="BookInsertServlet" method="post">
+        书号：<input type="text" name="bookid" value="111"><br>
+        书名：<input type="text" name="title" value="Java Web编程技术"><br>
+        作者：<input type="text" name="author" value="沈泽刚"><br>
+        出版社：<input type="text" name="publisher" value="清华大学出版社"><br>
+        单价：<input type="text" name="price" value="39.00"><br>
+        <input type="submit" value="提交">
+    </form>
+    
+    <%-- 显示操作结果 --%>
+    <% 
+    String result = (String)request.getAttribute("result");
+    if(result != null) {
+        out.println("<p>" + result + "</p>");
+    }
+    %>
+</body>
+</html>

webapp/out.jsp

@@ -0,0 +1,14 @@
+<%@ page contentType="text/html;charset=gb2312" %>
+<html><head><title>Out Example</title></head>
+<body>
+<h2>out对象的使用</h2>
+<% 
+  out.print("学习使用out对象");
+  int buffer = out.getBufferSize();
+  int available = out.getRemaining();
+ %>
+ <br>
+ out对象的类型为：<%= out.getClass().getName() %><br>
+ BufferSize=<%= buffer %><br>
+ Available=<%= available %>
+</body></html>

webapp/request.jsp

@@ -0,0 +1,13 @@
+<%@ page contentType="text/html;charset=gb2312" %>
+<% 
+  String remoteAddr = request.getRemoteAddr();
+  String remoteHost = request.getRemoteHost();
+  int serverPort = request.getServerPort();
+ %>
+<html>
+<body>
+你的IP地址为：<%=remoteAddr %><br>
+你的主机名为：<%=remoteHost %><br>
+服务器的端口号为：<%=serverPort %><br>
+</body>
+</html>

webapp/session.jsp

@@ -0,0 +1,12 @@
+<%@ page contentType="text/html;charset=gb2312" %>
+<%@ page session="true" %>
+<% 
+   session.setAttribute("user","欧阳清风");
+%>
+
+<html>
+<body>
+您的会话ID是：<%=session.getId()%><br>
+session对象中存放的变量user的值为：<%=session.getAttribute("user")%>
+</body>
+</html>

webapp/syntax_error.jsp

@@ -0,0 +1,9 @@
+<%@ page contentType="text/html;charset=gb2312" %>
+<%@ page import="java.util.*" %>
+<%@ page errorPage="exception.jsp" %>
+
+<% 
+  Calendar rightNow = null;
+  
+  //下行代码将产生NullPointerException异常
+  rightNow.getTime();