使用JDBC查询数据

来源：互联网发布：2017淘宝禁售商品明细编辑：程序博客网时间：2024/05/19 18:48

Book:

package com.home.web.dto;public class Book {    private int id;    private String name;    private double price;    private int bookCount;    private String author;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public double getPrice() {        return price;    }    public void setPrice(double price) {        this.price = price;    }    public int getBookCount() {        return bookCount;    }    public void setBookCount(int bookCount) {        this.bookCount = bookCount;    }    public String getAuthor() {        return author;    }    public void setAuthor(String author) {        this.author = author;    }}

FindServlet:

package com.home.web.servlet;import java.io.IOException;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.Statement;import java.util.ArrayList;import java.util.List;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.home.web.dto.Book;/** * Servlet implementation class AddServlet */@WebServlet("/FindServlet")public class FindServlet extends HttpServlet {private static final long serialVersionUID = 1L;           /**     * @see HttpServlet#HttpServlet()     */    public FindServlet() {        super();    }/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        try {            Class.forName("com.mysql.jdbc.Driver");            String url = "jdbc:mysql://localhost:3306/test";            Connection conn = DriverManager.getConnection(url, "root", "123456");            Statement stmt = conn.createStatement();            String sql = "select * from t_books";            ResultSet rs = stmt.executeQuery(sql);            List<Book> list = new ArrayList<>();            while (rs.next()) {                Book book = new Book();                book.setId(rs.getInt("id"));                book.setName(rs.getString("name"));                book.setPrice(rs.getDouble("price"));                book.setBookCount(rs.getInt("bookCount"));                book.setAuthor(rs.getString("author"));                list.add(book);            }            request.setAttribute("list", list);            rs.close();            stmt.close();            conn.close();        } catch (Exception e) {            e.printStackTrace();        }        request.getRequestDispatcher("result.jsp").forward(request, response);}/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        doGet(request, response);}}

index.jsp：

<%@page import="java.net.URLDecoder"%><%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!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>添加图书</title></head><body><a href="FindServlet">查看所有图书</a></body></html>

result.jsp：

<%@page import="java.sql.*"%><%@ page language="java" import="java.util.*" autoFlush="true"import="com.home.web.dto.*" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!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>Insert title here</title></head><body><table align="center" width="450"><tr><td colspan="5" align="center"><h2>所有图书信息</h2></td></tr><tr align="center"><td><b>ID</b></td><td><b>图书名称</b></td><td><b>价格</b></td><td><b>数量</b></td><td><b>作者</b></td></tr><%    List<Book> list = (List<Book>) request.getAttribute("list");    if (list == null || list.size() < 1) {        out.println("没有数据！");    } else {        for (Book book : list) {%><tr align="center"><td><%=book.getId()%></td><td><%=book.getName()%></td><td><%=book.getPrice()%></td><td><%=book.getBookCount()%></td><td><%=book.getAuthor()%></td></tr><%    }    }%></table></body></html>

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