简单的JavaWeb注册登录案例

1.注册页面register.html

register

姓名：

电话：

邮箱：

qq：

2.注册案例实现程序register.java

/**

* 注册案例实现程序

* @author lucky

*

*/

public class register extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response) {

//获取表单提交过来的信息

String username = request.getParameter("username");

String telephone = request.getParameter("telephone");

String email = request.getParameter("email");

String qq = request.getParameter("qq");

//调用database中的insert方法，将新用户添加到数据库中

database db = new database();

try {

db.insert(username, telephone, email, qq);

} catch (Exception e) {

e.printStackTrace();

}

}

}

3.登录页面enter.html

Insert title here

用户：

密码：

4.登录案例实现程序enter.java

/**

* 登录案例实现代码

* @author lucky

*

*/

public class enter extends HttpServlet{

public void doGet(HttpServletRequest request,HttpServletResponse response) {

//获取表单提交的信息

String username = request.getParameter("username");

String qq = request.getParameter("qq");

//标记，i=2:出现错误 i=1:登录成功 i=0:登录失败

int i = 2;

//调用database方法read查询数据库

//用户名密码(qq)匹配则i=1 不匹配则i=0

database db = new database();

try {

i = db.read(username, qq);

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

System.out.println(i);

}

}

5.数据库操作相关程序database.java

/*

* 数据库操作相关程序

*/

public class database {

/*

* 用户注册，像数据库中添加信息

*/

public void insert(String username,String telephone,String email,String qq) throws Exception {

//连接池

ComboPooledDataSource cp = new ComboPooledDataSource();

Connection conn = cp.getConnection();

String sql = "insert into user(username,telephone,email,qq) values(?,?,?,?);";

//语句预编译执行者

PreparedStatement pt = conn.prepareStatement(sql);

//插入参数

pt.setString(1, username);

pt.setString(2, telephone);

pt.setString(3, email);

pt.setString(4, qq);

//执行sql语句，输出结果

int i = pt.executeUpdate();

System.out.println(i);

}

/*

* 用户登录 向数据库查询用户输入信息是否正确

*/

public int read(String username,String qq) throws Exception {

ComboPooledDataSource cp = new ComboPooledDataSource();

Connection conn = cp.getConnection();

//通过提交的用户名对比查询相应的qq 结果一致则输入正确 不一致则输入错误

String sql = "select qq from user where username = ?;";

//用pwd接受数据库中查询出来的qq信息

String pwd = null;

PreparedStatement pt = conn.prepareStatement(sql);

pt.setString(1, username);

//re接收结果集

ResultSet rs = pt.executeQuery();

//对比qq信息是否一致

while(rs.next()){

pwd = rs.getString("qq");

System.out.println("qq"+pwd);

}

//输出结果

if(pwd.equals(qq)) return 1;

elsereturn 0;

}

}

6.web.xml

registerenter

register

web.register

register

/register

enter

web.enter

enter

/enter

新人学习记录，有问题可以一起探讨。