1.源代码
package com.jaovo.msg.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 getConnection() {
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
} catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String user = "sa";
String password = "123456";
String url = "jdbc:sqlserver://127.0.0.1:1433;DatabaseName=jaovo_msg";
Connection connection = null;
try {
connection
connection = DriverManager.getConnection(url,user,password);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return connection;
}
public static void close(Connection connection ) {
try {
if (connection != null) {
connection.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void close(PreparedStatement preparedStatement ) {
try {
if (preparedStatement != null) {
preparedStatement.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void close(ResultSet resultSet ) {
try {
if (resultSet != null) {
resultSet.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//连接数据库
<%@ 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>
<title>用户登录页面</title>
</head>
<body>
<%String res=(String)request.getAttribute("error");
if(res=="null"||res==null)
{
res="";
}
%>
<%=res%>
<form action="logincheck.jsp" method="get">
<table align="center" border="1" width="500">
<tr>
<td>用户名称 : </td>
<td>
<input type="text" name="username" />
</td>
</tr>
<tr>
<td>用户密码:</td>
<td>
<input type="password" name="password" />
</td>
</tr>
<tr align="center">
<td colspan="2">
<input type="submit" value="登录" />
<input type="reset" value="重置" />
<input type="button" value="注册" onClick="window.location.href='addInput.jsp'"/>
</td>
</tr>
</table>
</form>
</body>
</html>
//网页 html
<%@page import="com.jaovo.msg.Util.UserException"%>
<%@page import="com.jaovo.msg.dao.UserDaoImpl"%>
<%@page import="com.jaovo.msg.model.User"%>
<%@ 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>
<%
//接收客户端传递过来的参数
String username = request.getParameter("username");
String password = request.getParameter("password");
if (username == null || "".equals(username.trim())) {
request.setAttribute("error", "用户名不能为空");
%>
<jsp:forward page="login.jsp"></jsp:forward>
<%
}
%>
<%
User user = new User();
user.setUsername(username);
user.setPassword(password);
UserDaoImpl userDao = new UserDaoImpl();
try {
if (userDao.checkuser(user)) {
%>
<jsp:forward page="success.jsp"></jsp:forward>
<%
} else
{
request.setAttribute("error", "用户名/密码有误");
%>
<jsp:forward page="login.jsp"></jsp:forward>
<%
}
} catch (UserException e) {
%>
<h2 style="color: red; font-size: 50px">
发生错误 :
<%=e.getMessage()%></h2>
<%
}
%>
</html>
2.截图：
随后还要写一个有关Tomcat安装和作用的博客园
完成上述内容需要一个j较高版本的jdk，MyEclipse10自带的jdk1.6我无法执行出结果用的是自己配置变量时的jdk1.8.
Java web感觉学了Java连门都没入，不会操作数据库，不会写html，没有连接。。。。。。。各种问题都有。
希望以后每星期都有两个小时来学习Java web开发。