SpringMVC与mysql进行登录验证

SpringMVC可以基于Annotation去请求方法，这次我们来实现SpringMVC+mysql的验证与页面跳转。
创建web.xml

	
		spring
		org.springframework.web.servlet.DispatcherServlet
		1
	
	
	
		spring
		/
	

	
		welcome.jsp
	

这里创建了Spring提供的servlet，按照约定，要在WEB-INF下建立对应名字-servlet来配置SpringMVC的控制器扫描和跳转页面的配置，spring-servlet如下：

分别在根目录下建立登录成功和登录失败页面success.jsp error.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>







${username}登录成功

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>







${username}登录失败

默认的欢迎页面如下welcome.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>







欢迎你
点此请求DispatcherServlet并跳转


username:


password:

可以用超链接转到show.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>







成功进行了跳转

控制器bean:

package micro.action;

import javax.servlet.http.HttpServletRequest;

import micro.service.LoginCheck;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;


@Controller
@RequestMapping
public class FirstSpringMVC {
	
	@RequestMapping("/spring")
	public ModelAndView test()
	{
		String str = "this is a SpringMVC instance!";
		return new ModelAndView("show","str",str);
	}
	
	@RequestMapping("/login")
	public ModelAndView check(HttpServletRequest request)
	{
		String name = request.getParameter("username");
		String password = request.getParameter("password");
		//调用业务处理LoginCheck
		if(LoginCheck.check(name, password))
		{
			return new ModelAndView("success","username",name);
		}
		return new ModelAndView("error","username",name);
	}

}

业务处理模块LoginCheck验证用户:

package micro.service;


import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import micro.dao.Dao;

public class LoginCheck {
	
	public static boolean check(String name,String password)
	{
		//处理业务逻辑
		try
		{
			Connection conn = Dao.getConnection();
			PreparedStatement p = conn.prepareStatement("select * from test where username = ? and password = ?");
			p.setString(1, name);
			p.setString(2, password);
			ResultSet rs = p.executeQuery();
			while(rs.next())
			{
				Dao.close(rs, p, conn);
				return true;
			}
			Dao.close(rs, p, conn);
			
		}
		catch(SQLException e)
		{
			e.printStackTrace();
			System.out.println("数据库连接出错");
		}
		return false;
	}
}

持久层Dao获得与关闭链接:

package micro.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Dao {
	//获得数据库连接
	public static Connection getConnection()
	{
  		Connection conn = null;
		String url = "jdbc:mysql://localhost:3306/micro";
		try
		{
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection(url,"root","root");
		}
		catch(ClassNotFoundException e)
		{
			e.printStackTrace();
			System.out.println("数据库驱动加载出错");
		}
		catch(SQLException e)
		{
			e.printStackTrace();
			System.out.println("数据库出错");
		}
		return conn;
	}
	 //关闭相关通道
	public static void close(ResultSet rs,PreparedStatement p,Connection conn)
	{
		try
		{
			rs.close();
			p.close();
			conn.close();
		}
		catch(SQLException e)
		{
			e.printStackTrace();
			System.out.println("数据关闭出错");
		}
	}
}

数据库字段

运行结果：

• 最后附上web与spring的一般配置：
  spring.xml:

web.xml:

看了此篇文章是不是感觉收获蛮大