获取数据库内容放入下拉框中
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获取数据库内容放入下拉框中
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獲取數據庫里的數據放入下拉框中，使下拉框顯示的內容是數據庫里的內容
功能分析：
效果圖演示
登陸頁面
點擊注冊按鈕之后（下拉框的數據是從SQLServer數據庫里獲取的數據）
看了上述演示有沒有一點心動的感覺呢？？？
下面跟隨我一起來探究一下代碼吧
數據庫
（我的數據庫名為Select，數據表名為people）
數據庫內容展示
在正式看代碼之前還是要先看一下**目錄結構**的
代碼演示
index.jsp代碼
<%@ 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 'index.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><form action="" method="post">賬號：<input type="text" name="name"><br>密碼：<input type="password" name="pwd"><br><input type="submit" value="登錄"><a href="toRegister">注冊</a></form></body> </html>util包里的DBUtil.java代碼
package com.zsh.util;import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException;public class DBUtil {public static Connection getConn(){String url = "jdbc:sqlserver://localhost:1433;databaseName=Select";String user = "sa";String pwd = "1";Connection conn = null;try {Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");conn = DriverManager.getConnection(url, user, pwd);} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}return conn;}public static void closeConn(Connection conn, PreparedStatement ps, ResultSet rs){if(conn!=null){try {conn.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(ps!=null){try {ps.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(rs!=null){try {rs.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}bean包里的Department.java代碼
package com.zsh.bean;public class Department {private int id;private String name;private String mark;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 String getMark() {return mark;}public void setMark(String mark) {this.mark = mark;}public Department() {super();// TODO Auto-generated constructor stub}public Department(int id, String name, String mark) {super();this.id = id;this.name = name;this.mark = mark;}}servlet包里的ToRegisterServlet.Java代碼
package com.zsh.servlet;import java.io.IOException; import java.io.PrintWriter; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;import com.zsh.bean.Department; import com.zsh.util.DBUtil;public class ToRegisterServlet 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");response.setContentType("text/html");Connection conn = DBUtil.getConn();PreparedStatement ps = null;ResultSet rs = null;String sql = "select * from people";List<Department> depts = new ArrayList<Department>();try {ps = conn.prepareStatement(sql);rs = ps.executeQuery();while(rs.next()){Department dept = new Department();dept.setId(rs.getInt(1));dept.setName(rs.getString(2));depts.add(dept);}} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{DBUtil.closeConn(conn, ps, rs);}HttpSession session = request.getSession();session.setAttribute("deptList", depts);response.sendRedirect("register.jsp");}}register.jsp代碼
<%@page import="com.zsh.bean.Department"%> <%@ 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 'register.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><form action="register" method="post">部門：<select name="dep"><%List<Department> depts = (List)session.getAttribute("deptList");for(Department dept : depts){%><option value="<%=dept.getId() %>"><%=dept.getName() %></option><%}%><option></option></select><input type="submit" value="注冊"></form></body> </html>仔細觀看了解上述代碼之后快去實現它吧。
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