jsp实现登录功能并且将数据传到数据库

1.新建一个Dynamic Web Project项目，导入要用的jar包，整体的框架如图所示：





2.新建一个数据库，并且创建一个表和几个字段。



3.UserDao.java代码：

package dao;

import java.sql.SQLException;

import domain.User;

public interface UserDao {

void regist(User user) throws SQLException;

}

4.UserDaoImpl.java代码：

package dao;

import java.sql.SQLException;

import org.apache.commons.dbutils.QueryRunner;

import utils.JdbcUtils;
import domain.User;

public class UserDaoImpl implements UserDao {

@Override
public void regist(User user) throws SQLException {
QueryRunner queryRunner = new QueryRunner(JdbcUtils.getDataSource());
String sql = "insert into user values (?,?,?,?,?,?,?)";
Object[] params = { user.getUid(), user.getUsername(),
user.getPassword(), user.getNickname(), user.getEmail(),
user.getState(), user.getCode() };
queryRunner.update(sql, params);
}

}

5.User.java代码：

package domain;

public class User {

private Integer uid;
private String username;
private String password;
private String nickname;
private String email;
private Integer state;
private String code;

public Integer getUid() {
return uid;
}

public void setUid(Integer uid) {
this.uid = uid;
}

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

public String getNickname() {
return nickname;
}

public void setNickname(String nickname) {
this.nickname = nickname;
}

public String getEmail() {
return email;
}

public void setEmail(String email) {
this.email = email;
}

public Integer getState() {
return state;
}

public void setState(Integer state) {
this.state = state;
}

public String getCode() {
return code;
}

public void setCode(String code) {
this.code = code;
}

}

6.UserService.java代码：

package service;

import java.sql.SQLException;

import domain.User;

public interface UserService {

void regist(User user) throws SQLException;

}

7.UserServiceImpl.java代码：

package service;

import java.sql.SQLException;

import dao.UserDao;
import dao.UserDaoImpl;
import domain.User;

public class UserServiceImpl implements UserService {

@Override
public void regist(User user) throws SQLException {
UserDao userDao = new UserDaoImpl();
userDao.regist(user);
}

}

8.RegistServlet.java代码：

package servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import service.UserService;
import service.UserServiceImpl;
import utils.UUIDUtils;
import domain.User;

public class RegistServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
request.setCharacterEncoding("utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
String nickname = request.getParameter("nickname");
String email = request.getParameter("email");
User user = new User();
user.setUsername(username);
user.setPassword(password);
user.setNickname(nickname);
user.setEmail(email);
user.setState(0);
String code = UUIDUtils.getUUID() + UUIDUtils.getUUID();
user.setCode(code);
UserService userService = new UserServiceImpl();
userService.regist(user);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException();
}
}

}

9.JdbcUtils.java代码：

package utils;

import java.sql.Connection;
import java.sql.SQLException;

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class JdbcUtils {

private static DataSource ds = new ComboPooledDataSource();
private static ThreadLocal<Connection> tl = new ThreadLocal<Connection>();

public static DataSource getDataSource() {
return ds;
}

public static Connection getConnection() throws SQLException {
Connection con = tl.get();
if (con != null)
return con;
return ds.getConnection();
}

public static void beginTransaction() throws SQLException {
Connection con = tl.get();
if (con != null)
throw new SQLException("已经开启了事务，不能重复开启！");
con = ds.getConnection();
con.setAutoCommit(false);
tl.set(con);
}

public static void commitTransaction() throws SQLException {
Connection con = tl.get();// 获取当前线程的事务连接
if (con == null)
throw new SQLException("没有事务不能提交！");
con.commit();
con.close();
con = null;
tl.remove();
}

public static void rollbackTransaction() throws SQLException {
Connection con = tl.get();
if (con == null)
throw new SQLException("没有事务不能回滚！");
con.rollback();
con.close();
con = null;
tl.remove();
}

public static void releaseConnection(Connection connection)
throws SQLException {
Connection con = tl.get();
if (connection != con) {
if (connection != null && !connection.isClosed()) {
connection.close();
}
}
}
}

10.UUIDUtils.java代码：

package utils;

import java.util.UUID;

public class UUIDUtils {

public static String getUUID() {
return UUID.randomUUID().toString().replace("-", "");
}

}

11.c3p0-config.xml代码：

<c3p0-config>
<default-config>
<property name="jdbcUrl">jdbc:mysql://localhost:3306/regist_web
</property>
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="user">root</property>
<property name="password">root</property>

<property name="checkoutTimeout">30000</property>
<property name="idleConnectionTestPeriod">30</property>
<property name="initialPoolSize">10</property>
<property name="maxIdleTime">30</property>
<property name="maxPoolSize">100</property>
<property name="minPoolSize">10</property>
<property name="maxStatements">200</property>
</default-config>
</c3p0-config>

12.web.xml代码：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>regist</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>RegistServlet</servlet-name>
<servlet-class>servlet.RegistServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>RegistServlet</servlet-name>
<url-pattern>/RegistServlet</url-pattern>
</servlet-mapping>
</web-app>

13.regist.jsp代码：

<%@ 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>Insert title here</title>
</head>
<body>
<h1>用户注册的界面</h1>
<form action="RegistServlet" method="post">
<table width="600" border="1">
<tr>
<td>用户名：</td>
<td><input type="text" name="username"/></td>
</tr>
<tr>
<td>密码：</td>
<td><input type="password" name="password"/></td>
</tr>
<tr>
<td>昵称：</td>
<td><input type="text" name="nickname"/></td>
</tr>
<tr>
<td>邮箱：</td>
<td><input type="text" name="email"/></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="注册"/></td>
</tr>
</table>
</form>
</body>
</html>

14.在浏览器输入http://localhost:8080/regist/regist.jsp运行得到：