代码实例
Test.java
package Ke; import Ke.util; import java.sql.*; import java.util.Scanner; public class Test { static Connection conn; static PreparedStatement ps = null; static ResultSet rs; static String sql = "select * from Ke_c"; static util ut= new util(); static Scanner in = new Scanner(System.in); static String Ke; static String Tea; static String Di; public static String a_Ke() { return Ke; } public static String a_Tea() { return Tea; } public static String a_Di() { return Di; } public static int add(String Ke,String Tea,String Di) { conn= ut.getConn(); String sql="insert into Ke_c values(?,?,?)"; int b=0; System.out.println(Ke); try { ps=conn.prepareStatement(sql); ps.setString(1,Ke); ps.setString(2, Tea); ps.setString(3, Di); int a=ps.executeUpdate(); if(a>0) { b++; System.out.println("添加成功"); } else { System.out.println("添加失败"); } }catch(Exception e) { e.printStackTrace(); } try { if(ps!=null)ps.close(); if(conn!=null)conn.close(); }catch(Exception e2) { e2.printStackTrace(); } return b; } public static int uqdate(String Ke,String Tea,String Di) { int b=0; conn=ut.getConn(); ps=null; sql="update Ke_c set Tea=?,Di=? where Ke=?"; try { ps=conn.prepareStatement(sql); ps.setString(1, Tea); ps.setString(2, Di); ps.setString(3,Ke); int a=ps.executeUpdate(); if(a>0) { b++; System.out.println("修改成功"); } else { System.out.println("修改失败"); } }catch(Exception e) { e.printStackTrace(); } try { if(ps!=null)ps.close(); if(conn!=null)conn.close(); }catch(Exception e2) { e2.printStackTrace(); } return b; } public static int delete(String Ke) { int b=0; conn=ut.getConn(); ps=null; sql="delete from Ke_c where Ke=?"; try { ps=conn.prepareStatement(sql); ps.setString(1, Ke); int a=ps.executeUpdate(); if(a>0) { b++; System.out.println("删除成功"); } else { System.out.println("删除失败"); } }catch(Exception e) { e.printStackTrace(); } try { if(ps!=null)ps.close(); if(conn!=null)conn.close(); }catch(Exception e2) { e2.printStackTrace(); } return b; } public static void find(String a) { conn=ut.getConn(); ps=null; ResultSet rs=null; String id; sql="select * from Ke_c where Ke=?"; try { ps=conn.prepareStatement(sql); ps.setString(1, a); rs=ps.executeQuery(); if(rs.next()) { Ke = rs.getString("Ke"); Tea = rs.getString("Tea"); Di = rs.getString("Di"); } }catch(SQLException e) { e.printStackTrace(); }finally { try { if(ps!=null)ps.close(); if(conn!=null)conn.close(); }catch(Exception e2) { e2.printStackTrace(); } } } public static void main(String[] args) { //add(); //uqdate(); //System.out.println("请输入要删除课程"); System.out.println("请输入查找课程："); String a; Scanner scan=new Scanner(System.in); a=scan.next(); //delete(a); find(a); } }
add.jsp
<%@page import="Ke.Test"%> <%@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>增加</title> <script type="text/javascript""> function validate() { var Ke=document.forms[0].Ke.value; var Tea=document.forms[0].Tea.value; var Di=document.forms[0].Di.value; if(Ke.length<=0){ alert("课程不能为空，请输入课程！"); return false; } else if(Tea.length<=0){ alert("教师不能为空，请输入教师姓名！"); return false; } else if(age<=0){ alert("地点不能为空，请输入地点！"); return false; } else if(Di.length<=0){ alert("专业不能为空，请输入所学专业！"); return false; } else{ return true; } //document.getElementById("form").submit(); } </script> </head> <body> <form action="addresult.jsp" method="post" id="form" onSubmit="return validate()" > <input type="hidden" name="methodName" value="0"/> <h4> 课程：<input type="text" name="Ke"title="课程不能为空"></input><br></h4> <h4> 任课教师：<input type="radio" name="Tea" value="Wangjianmin">王建民 <input type="radio" name="Tea" value="liulijia">刘立嘉 <input type="radio" name="Tea" value="liudan">刘丹 <input type="radio" name="Tea" value="wanghui">王辉 <input type="radio" name="Tea" value="yangziguang">杨子光 <br></h4> <h4> 上课地点：<input type="radio" name="Di" value="yijiao">一教 <input type="radio" name="Di" value="erjiao">二教 <input type="radio" name="Di" value="sanjiao">三教 <input type="radio" name="Di" value="jijiao">基教 <br></h4> <input type="submit" value="完成"/> </form> </body> </html>
addresult.jsp
<%@page import="Ke.Test"%> <%@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>添加结果</title> </head> <body> <% request.setCharacterEncoding("utf-8"); if(Test.add(request.getParameter("Ke"),request.getParameter("Tea"),request.getParameter("Di"))==1) { { out.print("<script language = 'javascript'>alert('添加成功');</script>"); response.setHeader("refresh", "0;url=Zhu.jsp"); } } else{ out.print("<script language = 'javascript'>alert('添加失败');</script>"); response.setHeader("refresh", "0;url=Zhu.jsp"); //out.println("添加失败"); } %> </body> </html>
