SSM 简易的网页登陆 （练手用）

登陆逻辑：
package com.ssm.controller;

import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.ssm.bean.Admin;
import com.ssm.bean.Instructor;
import com.ssm.bean.StudentInfo;
import com.ssm.service.AdminService;
import com.ssm.service.InstructorService;
import com.ssm.service.StudentInfoService;

@Controller
public class LoginController {

@Autowired
private StudentInfoService studentInfoService;

@Autowired
private InstructorService instructorService;

@Autowired
private AdminService adminService;


@RequestMapping("/LoginController")
public String login(Integer id,String spwd,String validationCode,String name1,HttpSession session) {

	/**
	 * 获取页面验证码
	 * */
	String vccodeString=	(String) session.getAttribute("vcCode");
	System.out.println(id);
	/**
	 * 判断用户如果没有输入用户名或密码 跳转(错误页面)err.jsp
	 * */
	if(null==id || null==spwd) {
		return "err";
	}
	/**
	 * 然后判断用户选择的类型是什么(即 学生or管理员or导员)
	 * */
	/**
	 * 将获取的radio属性的值转为int类型方便判断数值 从而判断进入某一个页面
	 * */
	int type=	Integer.parseInt(name1);
	/**
	 * 当type的值分别为 0 1 2 的时候 分别对其进查询操作 
	 * 并将用户输入的值与系统查询的值进行匹配 
	 * 如果成功则进入相应页面，若不成功则跳转错误页面(err.jsp)
	 * */
	if(type==0) {
		StudentInfo studentInfo=	studentInfoService.queryStudentInfoById(id);
		String pwd1=studentInfo.getSpwd();
		Integer newid1=studentInfo.getId();
		if(id.equals(newid1) && spwd.equals(pwd1)
				&& validationCode.equals(vccodeString)) {
			session.setAttribute("studentInfo", studentInfo);
			return "student";
		}else {
			return "err";
		}
	}else if(type==1) {
		Instructor instructor=instructorService.queryInstructorById(id);
		String pwd2=instructor.getHpwd();
		Integer newid2=instructor.getId();
		if(id.equals(newid2) && spwd.equals(pwd2)
				&& validationCode.equals(vccodeString)) {
			session.setAttribute("instructor", instructor);
			return "instructor";
		}else {
			return "err";
		}
	}else {
		System.out.println(type);
		Admin  admin=adminService.queryAdminById(id);	
		String pwd3=admin.getApwd();
		Integer newid3=admin.getId();
		System.out.println("测试专用---------------------------");
		System.out.println(admin);
		System.out.println(pwd3);
		System.out.println(newid3);
		System.out.println("测试专用---------------------------");
		
		if(id.equals(newid3) && spwd.equals(pwd3)
				&& validationCode.equals(vccodeString)) {
			System.out.println("测试专用---------------------------");
			System.out.println("id:"+id.equals(newid3));
			System.out.println("pwd:"+spwd.equals(pwd3));
			System.out.println("验证码:"+validationCode.equals(vccodeString));
			System.out.println("测试专用---------------------------");
			session.setAttribute("admin", admin);
			return "index";
		}else {
			return "err";
		}
	}
}

}

login.jsp
<%@ page language=“java” contentType=“text/html; charset=UTF-8”
pageEncoding=“UTF-8”%>

欢迎使用奖助学金管理系统

请选择以下方式登录

第三方登录:

• Connect with Wechat
• Login with Tencent QQ

		<h3>站内登录:</h3>
		<form action="LoginController">
			<div class="user">
				<input type="text" name="id" value="用户名" onfocus="this.value = '';"
					onBlur="if (this.value == '') {this.value = '用户名';}"> <i></i>
			</div>
			<div class="user-in">
				<input type="password" name="spwd" value="密码"
					onfocus="this.value = '';"
					onBlur="if (this.value == '') {this.value = 'Password';}">
				<i></i>
			</div>
			<div class="user">
				<input type="text" name="validationCode" id="validationCode"
					placeholder="请输入验证码" />
			</div>
			<img id="validationCode_img" src="validate.jsp"> <br /> <br />
			<label class="layui-form-label">职业:</label> <br /> <br />
			<div class="layui-input-block">
				<input type="radio" name="name1" value="0" title="学生">学生 
				<input type="radio" name="name1" value="1" title="教师">教师
				<input type="radio" name="name1" value="2" title="管理员">管理员
			</div>
			<div class="keepme">
				<label class="checkbox"><input type="checkbox"
					name="checkbox"><i> </i> 保存登录</label>
				<div class="keep-loginbutton">
					<input type="submit" value="登录" />
				</div>
				<div class="clear"></div>
			</div>
		</form>
		<div class="forgot">
			<p>
				<a href="#">忘记密码?</a>
			</p>
			<div class="forgot-register">
				<p>
					还没有注册? <a href="tips.jsp">点击注册</a>
				</p>
			</div>
			<div class="clear"></div>
		</div>
	</div>
</div>
<div class="copyright">
	<p>
		Template by <a href="http://www.baidu.com/" target="_blank">
			不会就百度 </a>
	</p>
</div>

效果图：

简易的实现：其中的dao service xml 各位老哥都懂就没放上去，哈哈。
有建议的话共勉学习。