SpringMVC实现登录注册-2

继上一篇SpringMVC实现登录注册-1，上一篇是用list代替数据库，这一篇采用MySQL，采用c3p0连接数据库，jsp界面没变

数据库

新增两个jar包

工程项目

UserController.java

package com.zjq.controller;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import com.zjq.db.DbPool;
import com.zjq.pojo.*;

@RequestMapping(value="/user")
@Controller
public class UserController {
	
	static Connection conn = DbPool.getConnectionFromPool();
	static PreparedStatement pstmt = null;
	private static ResultSet rs = null;
	
	User user = new User();
	/*注册界面*/
	@RequestMapping(value="/showRegUser")
	public String showRegUser() {
		return "regUser";
	}
	
	/*新增用户*/
	@RequestMapping(value="/addUser")
	public String addUser(
			@RequestParam("userName")String userName,
			@RequestParam("password")String password,
			@RequestParam("fullName")String fullName) throws Exception {
		user.setUserName(userName);
		user.setPassword(password);
		user.setFullName(fullName);
		if(savedata(user)) {
			return "login";
		}else {
			return "regUser";
		}
	}
	
	@RequestMapping(value="showLogin")
	public String showLogin() {  //直接跳转登录界面
		return "login"; 
	}
	
	/*验证用户*/
	@RequestMapping(value="/validateUser")
	public String login(
			@RequestParam("userName")String userName,
			@RequestParam("password")String password,
			Model model) {
		
		int i;
		try {
			user.setUserName(userName);
			i = search(userName,password);
			if(i == 1) {
				model.addAttribute("user",user); //回显数据
				return "welcome";
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "login";//验证失败，跳转到登录界面
	}
	
	/*判断密码是否正确，用户名是否存在*/
	public int search(String name,String pass) throws SQLException
	{
		String sql="select * from user where username = ?";
		int i = 1;
		pstmt = conn.prepareStatement(sql);
		pstmt.setString(i++, user.getUserName());
		rs = pstmt.executeQuery();
		if (rs == null) {
			return 0;
		} 
		if(rs.next()) {
			String pas = rs.getString("password"); //判断密码是否正确
			if(pas.equals(pass)) {
				return 1;
			}else {
				return -1;
			}
		}
		return 0;
	}
	
	/*注册的数据库操作*/
	public static boolean  savedata(User user) throws Exception {

		String insertsql = "insert into user(username,password) values(?,?)";// 预处理的语句对象
		int i = 1;
		pstmt = conn.prepareStatement(insertsql);
		pstmt.setString(i++, user.getUserName());
		pstmt.setString(i++, user.getPassword());
		int val = pstmt.executeUpdate();
		if (val > 0) {
			return true;
		} 
		return false;
	}

}

DbPool.java

package com.zjq.db;

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

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class DbPool {

	static DataSource dataSource;
	
	static {
		//如果没有参数，默认加载c3p0参数文件：文件名称、位置是固定的
		dataSource=new ComboPooledDataSource();
	}
	
	public static Connection getConnectionFromPool(){
		try {
			Connection  connection=dataSource.getConnection();
		    return connection;
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}

}

c3p0.properties

c3p0.jdbcUrl=jdbc:mysql://localhost:3306/你的数据库的名称  
c3p0.driverClass=com.mysql.jdbc.Driver 
c3p0.user=root 
c3p0.password=这里写你的数据库的密码  
c3p0.acquireIncrement=3   
c3p0.idleConnectionTestPeriod=60      
c3p0.initialPoolSize=10   
c3p0.maxIdleTime=60   
c3p0.maxPoolSize=20   
c3p0.maxStatements=100    
c3p0.minPoolSize=5