要做一个简单的保存网页界面，首先用jsp写出保存界面，本次界面比较简单，首先是三个提示语，后面是三个输入框，然后是保存按钮。
后台我写了两个java文件，第一个Bean.java是用来连接数据库以及更新的，第二个Update.java文件是用来更新表，记录界面输入的结果，所以在这个文件里需要判断输入的格式是否正确，比如任课教师只能输入王建民，刘力嘉，刘丹等等，所以这个文件里需要加入判断语句，最后我又加了一个jsp文件，提示输入正确与否，如果输入格式不正确，会有提示，如果输入正确，会提示保存成功 。
源代码：
Bean.java:
import java.sql.*;
public class Bean {
String userName = "root";
String userPwd = "24365426";
String connStr = "jdbc:mysql://localhost:3306/ClassTest";
String driverStr= "com.mysql.jdbc.Driver";
private Connection conn=null;
private Statement stmt=null;
//Statement 可以执行数据库查询 更新语句
public Bean()
{
try{
Class.forName(driverStr);
conn = DriverManager.getConnection(connStr,userName, userPwd);
//conn是 数据库链接地址
stmt = conn.createStatement();
}
catch(Exception ex){System.out.println("数据库连接失败");}
}
public int executeUpdate(String s)
{
int result=0;
try{
result=stmt.executeUpdate(s);
//更新固定返回0和1
}
catch(Exception ex){
System.out.println("更新失败"+ex.getMessage());
}
return result;
}
public ResultSet executeQuery(ResultSet rs, String s)
{
try{rs=stmt.executeQuery(s);}
catch(Exception ex){System.out.println("查询失败"+ex);}
return rs;
}
public void close()
{
try{
stmt.close();
conn.close();
}
catch(Exception e){}
}
}
Update.java:
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/Login")
public class Update extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Update() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
response.setHeader("Content-type", "text/html;charset=UTF-8");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
String username = request.getParameter("username");
String homeaddress=request.getParameter("address");
if(!homeaddress.equals("王建民")||!homeaddress.equals("刘力嘉")||!homeaddress.equals("刘丹")||!homeaddress.equals("王辉")||!homeaddress.equals("杨子光"))
{
out.print("<script language='javascript'>alert('教师姓名错误');window.location.href='Login.jsp';</script>");
}
String Pname =request.getParameter("Pname");
String miaoshu=request.getParameter("miaoshu");
if(homeaddress.equals("王建民")||homeaddress.equals("刘力嘉")||homeaddress.equals("刘丹")||homeaddress.equals("王辉")||homeaddress.equals("杨子光")) {
String s = "insert into classtest(username,homeaddress,Pname,miaoshu) values ('"+username+"','"+homeaddress+"','"+Pname+"','"+miaoshu+"')";
Bean db= new Bean();
int i = db.executeUpdate(s);
if(!homeaddress.equals("王建民")||!homeaddress.equals("刘力嘉")||!homeaddress.equals("刘丹")||!homeaddress.equals("王辉")||!homeaddress.equals("杨子光"))
{
out.print("错误");
}
if(i==1)
{
out.print("<script language='javascript'>alert('保存成功');window.location.href='LoginSuccess.jsp';</script>");
//脚本语言
}
else
{
out.println("<script language='javaScript'> alert('保存失败，请从新添加');</script>");
}
}
}
}
Login.jsp:
<%@ 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=ISO-8859-1">
<title>登录界面</title>
</head>
<body>
<form name = "form1" method = "post" action = "LoginSuccess.jsp" onsubmit = "return isValidate(form1)" >
<table>
<tr> <td>课程名称</td> <td><input type ="text" name="username"></td></tr>
<tr> <td>上课教师</td> <td><input type ="text" name="address"></td></tr>
<tr> <td>上课地点</td> <td><input type ="text" name="Pname"></td></tr>
<tr><td colspan = "2"><input type = "submit" name = "submit" value = "保存" style = "width:80px;height:40px;font-size:20px;border:1;"></td>
</tr>
</table>
</form>
</body>
</html>
LoginSuccess.jsp:
<%@ 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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>保存成功 </h1>
</body>
</html>
运行截图：
