hospital 基于反射的 在线医疗项目(二)

一、登录/注册/验证码

1. 登录、注册、主页等jsp前端页面准备

​ 1.1 、首先我们在WebContent 文件夹下创建static （静态文件夹），该文件夹是用来放置静态文件的，static文件夹创建css、js、img三个文件夹。同时创建jsp页面，起初要创建的页面如下图：

hospital06

​ 1.2、当然，我们需要给出login.jsp的代码，使得我们不需要花费时间在样式上。

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<%
	String path=request.getScheme()+"://"+request.getServerName()+":"+
	request.getServerPort()+request.getContextPath()+"/";
	pageContext.setAttribute("path", path);
%>
<!DOCTYPE html>
<html>
<head>
    <title>ONESTAR-在线医疗管理系统</title>
	<meta charset="UTF-8">
	<link rel="icon" href="static/img/me.jpg" type="image/x-icon" />
    <link rel="stylesheet" type="text/css" href="static/css/bootstrap.css" />
    <link rel="stylesheet" type="text/css" href="static/css/bootstrap-responsive.css" />
    <link rel="stylesheet" type="text/css" href="static/css/style.css" /> 
    <link rel="stylesheet" type="text/css" href="static/css/login-inner.css" />
    <!-- js -->
    <script type="text/javascript" src="static/js/jquery.js"></script>
    <script type="text/javascript" src="static/js/bootstrap.js"></script>
    <script type="text/javascript" src="static/js/ckform.js"></script>
    <script type="text/javascript" src="static/js/common.js"></script>
    <script type="text/javascript" src="static/js/jquery-3.4.1.js"></script>
    <!--表单验证  -->
    <script type="text/javascript" src="static/js/jquery.validate.js"></script>
    <script type="text/javascript" src="static/js/messages_zh.js"></script>

</head>
<body>
	<div class="container">
		
	    <form class="form-signin" method="post" action="user" id="form-signin">
	    	<input type="hidden" name="method" value="checkLogin">
	        <h2 class="form-signin-heading" >在线医疗管理系统</h2>

	        <p id="message" style=" 400px;height: 30px;text-align: center;"></p>
	        <p><input type="text" name="username" class="input-block-level" value="lisi" placeholder="账号" ></p>
	        <p><input type="password" name="password" class="input-block-level" placeholder="密码" value="321" >
	        <p class="yanzhengma">
	        	<input type="text" name="verify" class="input-medium" placeholder="验证码" > 
	        	<img id="code" class="code_images"  src="${path }authImage" /> 
	        	<a href='javascript:void(0);' onclick="javascript:changeImg()" style="color:white;text-decoration: none;">
	        		<span style="color:blue;margin-left: 5px;">看不清？</span>
	        		<span id= "yanzhengmaError"></span>
        		</a>
				
			</p>
	        <p style="text-align: center;">
	        <input id="login" type="button" value="登录" name="login" class="btn btn-large btn-primary" style=" 150px;"/>
	        <a href="regist.jsp">请先注册</a>
	        </p>
	    </form>
	</div>
		
	<script type="text/javascript">
		function changeImg(){
		    var img = document.getElementById("code"); 
		    img.src = "${path}/authImage?date=" + new Date();;
		}
		
	</script>
</body>
</html>

1.3 register.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	String path=request.getScheme()+"://"+request.getServerName()+":"+
	request.getServerPort()+request.getContextPath()+"/";
	pageContext.setAttribute("path", path);
%>
<!DOCTYPE html>
<html>
<head>
    <title>ONESTAR-在线医疗管理系统</title>
	<meta charset="UTF-8">
	<link rel="icon" href="static/img/me.jpg" type="image/x-icon" />
    <link rel="stylesheet" type="text/css" href="static/css/bootstrap.css" />
    <link rel="stylesheet" type="text/css" href="static/css/bootstrap-responsive.css" />
    <link rel="stylesheet" type="text/css" href="static/css/style.css" />
    <link rel="stylesheet" type="text/css" href="static/css/regist-inner.css" />
    <!-- js -->
    <script type="text/javascript" src="static/js/jquery.js"></script>
    <script type="text/javascript" src="static/js/bootstrap.js"></script>
    <script type="text/javascript" src="static/js/ckform.js"></script>
    <script type="text/javascript" src="static/js/common.js"></script>
    <script type="text/javascript" src="static/js/jquery-3.4.1.js"></script>
    <script type="text/javascript" src="static/js/jquery.validate.js"></script>
    <script type="text/javascript" src="static/js/messages_zh.js"></script>

</head>
<body>
<div class="container">	
    <form class="form-signin" method="post" action="user" id = "form-signin">
    	<input type="hidden" name="method" value="regist">
        <h2 class="form-signin-heading" >管理员注册</h2>
        <p id="message" style=" 400px;height: 30px;text-align: center;"></p>
                        姓&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;名：
		<input type="text" name="name" class="input-block-level" placeholder="账号">
		<br/>
                        密&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;码：
        <input id="password" type="password" name="password" class="input-block-level" placeholder="密码">
        <br/>
                       确认密码：<input type="password" name="password2" class="input-block-level" placeholder="确认密码">
        <br/>
                        用&nbsp;&nbsp;户&nbsp;&nbsp;名：<input type="text" id="username" name="username" class="input-block-level" placeholder="用户名">
        <span id="username_msg"></span><br/>
                        邮&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;箱：<input type="text" id="email" name="email" class="input-block-level" placeholder="邮箱">
        <span id="email_msg"></span><br/>               
        <p style="text-align: center;">
        <input id=register type="button" value="注册" name="login" class="btn btn-large btn-info" style=" 100px;"/>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        <input id="reset" type="reset" value="清空" name="login" class="btn btn-large btn-info" style=" 100px;"/>
        </p>
    </form>
</div>

</body>
</html>
2. 表单验证和图片验证码

我们首先来讲图片验证码，让其能再登录页正常显示。

​ 1.1、页面验证码时，img标签的src路径是： src="${path }authImage"，经解析后，实际上像后台请求的路径为：http://localhost:8080/hospital/authImage， 此时我们就需要在controller包中新建一个AuthImageServlet，注解路径为 @WebServlet("/authImage")，同时在util包创建生成验证码工具类 VerifyCodeUtils，两者代码如下：

AuthImageServlet代码：

package com.dzb.controller;

import java.io.IOException;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.dzb.util.VerifyCodeUtils;


@WebServlet("/authImage")
public class AuthImageServlet  extends HttpServlet implements Servlet{
	
	
	static final long serialVersionUID = 1L; 
	   
    public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
        response.setHeader("Pragma", "No-cache"); 
        response.setHeader("Cache-Control", "no-cache"); 
        response.setDateHeader("Expires", 0); 
        response.setContentType("image/jpeg"); 
        
        // 参数：date
        String date = request.getParameter("date");
        
        System.out.println("date:" + date);
        
        //生成随机字串 
        String verifyCode = VerifyCodeUtils.generateVerifyCode(4); 
        
        System.out.println("随机字符串：" + verifyCode);
        //存入会话session 
        HttpSession session = request.getSession(true); 
        
        System.out.println("Session:" + session);
        //删除以前的
        session.removeAttribute("verCode");

        session.setAttribute("verCode", verifyCode.toLowerCase()); 
        //生成图片 
        int w = 100, h = 30; 
        VerifyCodeUtils.outputImage(w, h, response.getOutputStream(), verifyCode); 
   
    } 
	
}

工具类VerifyCodeUtils：

package com.dzb.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Random;

import javax.imageio.ImageIO;

/**
 * 	生成验证码工具类
 * @author dzbiao
 *
 */
public class VerifyCodeUtils {
	// 使用到Algerian字体，系统里没有的话需要安装字体，字体只显示大写，去掉了1,0,i,o几个容易混淆的字符
	public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
	private static Random random = new Random();

	/**
	 * 使用系统默认字符源生成验证码
	 * 
	 * @param verifySize 验证码长度
	 * @return
	 */
	public static String generateVerifyCode(int verifySize) {
		return generateVerifyCode(verifySize, VERIFY_CODES);
	}

	/**
	 * 使用指定源生成验证码
	 * 
	 * @param verifySize 验证码长度
	 * @param sources    验证码字符源
	 * @return
	 */
	public static String generateVerifyCode(int verifySize, String sources) {
		if (sources == null || sources.length() == 0) {
			sources = VERIFY_CODES;
		}
		int codesLen = sources.length();
		Random rand = new Random(System.currentTimeMillis());
		StringBuilder verifyCode = new StringBuilder(verifySize);
		for (int i = 0; i < verifySize; i++) {
			verifyCode.append(sources.charAt(rand.nextInt(codesLen - 1)));
		}
		return verifyCode.toString();
	}

	/**
	 * 生成随机验证码文件,并返回验证码值
	 * 
	 * @param w
	 * @param h
	 * @param outputFile
	 * @param verifySize
	 * @return
	 * @throws IOException
	 */
	public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException {
		String verifyCode = generateVerifyCode(verifySize);
		outputImage(w, h, outputFile, verifyCode);
		return verifyCode;
	}

	/**
	 * 输出随机验证码图片流,并返回验证码值
	 * 
	 * @param w
	 * @param h
	 * @param os
	 * @param verifySize
	 * @return
	 * @throws IOException
	 */
	public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException {
		String verifyCode = generateVerifyCode(verifySize);
		outputImage(w, h, os, verifyCode);
		return verifyCode;
	}

	/**
	 * 生成指定验证码图像文件
	 * 
	 * @param w
	 * @param h
	 * @param outputFile
	 * @param code
	 * @throws IOException
	 */
	public static void outputImage(int w, int h, File outputFile, String code) throws IOException {
		if (outputFile == null) {
			return;
		}
		File dir = outputFile.getParentFile();
		if (!dir.exists()) {
			dir.mkdirs();
		}
		try {
			outputFile.createNewFile();
			FileOutputStream fos = new FileOutputStream(outputFile);
			outputImage(w, h, fos, code);
			fos.close();
		} catch (IOException e) {
			throw e;
		}
	}

	/**
	 * 输出指定验证码图片流
	 * 
	 * @param w
	 * @param h
	 * @param os
	 * @param code
	 * @throws IOException
	 */
	public static void outputImage(int w, int h, OutputStream os, String code) throws IOException {
		int verifySize = code.length();
		BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
		Random rand = new Random();
		Graphics2D g2 = image.createGraphics();
		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
		Color[] colors = new Color[5];
		Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN, Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA,
				Color.ORANGE, Color.PINK, Color.YELLOW };
		float[] fractions = new float[colors.length];
		for (int i = 0; i < colors.length; i++) {
			colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
			fractions[i] = rand.nextFloat();
		}
		Arrays.sort(fractions);

		g2.setColor(Color.GRAY);// 设置边框色
		g2.fillRect(0, 0, w, h);

		Color c = getRandColor(200, 250);
		g2.setColor(c);// 设置背景色
		g2.fillRect(0, 2, w, h - 4);

		// 绘制干扰线
		Random random = new Random();
		g2.setColor(getRandColor(160, 200));// 设置线条的颜色
		for (int i = 0; i < 20; i++) {
			int x = random.nextInt(w - 1);
			int y = random.nextInt(h - 1);
			int xl = random.nextInt(6) + 1;
			int yl = random.nextInt(12) + 1;
			g2.drawLine(x, y, x + xl + 40, y + yl + 20);
		}

		// 添加噪点
		float yawpRate = 0.05f;// 噪声率
		int area = (int) (yawpRate * w * h);
		for (int i = 0; i < area; i++) {
			int x = random.nextInt(w);
			int y = random.nextInt(h);
			int rgb = getRandomIntColor();
			image.setRGB(x, y, rgb);
		}

		shear(g2, w, h, c);// 使图片扭曲

		g2.setColor(getRandColor(100, 160));
		int fontSize = h - 4;
		Font font = new Font("Algerian", Font.ITALIC, fontSize);
		g2.setFont(font);
		char[] chars = code.toCharArray();
		for (int i = 0; i < verifySize; i++) {
			AffineTransform affine = new AffineTransform();
			affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1),
					(w / verifySize) * i + fontSize / 2, h / 2);
			g2.setTransform(affine);
			g2.drawChars(chars, i, 1, ((w - 10) / verifySize) * i + 5, h / 2 + fontSize / 2 - 10);
		}

		g2.dispose();
		ImageIO.write(image, "jpg", os);
	}

	private static Color getRandColor(int fc, int bc) {
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}

	private static int getRandomIntColor() {
		int[] rgb = getRandomRgb();
		int color = 0;
		for (int c : rgb) {
			color = color << 8;
			color = color | c;
		}
		return color;
	}

	private static int[] getRandomRgb() {
		int[] rgb = new int[3];
		for (int i = 0; i < 3; i++) {
			rgb[i] = random.nextInt(255);
		}
		return rgb;
	}

	private static void shear(Graphics g, int w1, int h1, Color color) {
		shearX(g, w1, h1, color);
		shearY(g, w1, h1, color);
	}

	private static void shearX(Graphics g, int w1, int h1, Color color) {

		int period = random.nextInt(2);

		boolean borderGap = true;
		int frames = 1;
		int phase = random.nextInt(2);

		for (int i = 0; i < h1; i++) {
			double d = (double) (period >> 1)
					* Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
			g.copyArea(0, i, w1, 1, (int) d, 0);
			if (borderGap) {
				g.setColor(color);
				g.drawLine((int) d, i, 0, i);
				g.drawLine((int) d + w1, i, w1, i);
			}
		}

	}

	private static void shearY(Graphics g, int w1, int h1, Color color) {

		int period = random.nextInt(40) + 10; // 50;

		boolean borderGap = true;
		int frames = 20;
		int phase = 7;
		for (int i = 0; i < w1; i++) {
			double d = (double) (period >> 1)
					* Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
			g.copyArea(i, 0, 1, h1, 0, (int) d);
			if (borderGap) {
				g.setColor(color);
				g.drawLine(i, (int) d, i, 0);
				g.drawLine(i, (int) d + h1, i, h1);
			}

		}
	}
}

1.2 验证码原理简析

​ 由前端传入日期参数date，通过工具类生成四位随机字符串，以小写形式存入session会话中，当前端需要更换验证码随机字符串时，也需要通过该流程，只是在此基础上添加了删除以前的session，即：session.removeAttribute("verCode"); 重新添加而已。

1.3 表单验证

​ 表单验证实际上使用了jquery.validate.js 插件，我们可以在菜鸟教程上简单的学习一下用法。地址：https://www.runoob.com/jquery/jquery-plugin-validate.html

hospital07

​ 表单验证使用name属性作为rules和messages的定位属性，因此我们必须在input 标签中声明name，与此同时 form标签添加 id定位 id="form-signin"。

hospital08

js 中的验证规则为：

/* 表单验证 */
$("#form-signin").validate({
    errorPlacement: function(error, element) {
        if (element.parent().hasClass("yanzhengma")){
            error.appendTo($("#yanzhengmaError"));     // 将错误信息添加到id为 yanzhengmaError中
        }else {					
            error.insertAfter(element);
        }
    },
    onfocusout: function(element) { $(element).valid(); },
    rules:{		// 规则	
        username:{		// 用户名
            required:true
        },
        password:{		// 密码
            required:true
        },
        verify:{	   // 验证码
            required:true
        }                    
    },
    messages:{
        username:{
            required:"用户名不能为空"
        },
        password:{
            required: "密码不能为空"
        },
        verify:{
            required: "验证码不能为空"
        }                                    
    },
    errorElement: "em"
});

当我们点击提交按钮的时候，我们如何获取表单数据是否验证成功的提示呢？所以我们通过 var flag = $("#form-signin").valid();获取，当表单的所有值都按照我们的要求通过后，flag 为true，反之，为false,基于这一点，我们判断是否提交。

// 提交按钮 点击触发
$("#login").click(function(){
    var flag = $("#form-signin").valid();
    if(!flag){
        //没有通过验证
        alert("没有通过验证");
        return;
    }
    var data = $("#form-signin").serialize();
    $.ajax({
        url:"user/login",
        type:"post",
        data:data,
        dataType:"json",
        success:function(message){
            console.log(message);
            if(message.status_code == 200){
                $("#message").css("color","green");

                setTimeout(function(){

                    location.href = "${path}"+"index.jsp";
                },1000) ;

            }else{
                $("#message").css("color","red");
            }
            $("#message").text(message.message);
        }
    });
});

1.4 同理，注册页面的表单验证也如登录页一样，在这就不多说，直接粘贴在register.jsp页面中。直接上代码：

<script type="text/javascript">
/* 表单验证 */
$("#form-signin").validate({
	
	onfocusout: function(element) { $(element).valid(); },
	rules:{
		name:{
            required:true
        },
        password:{
            required:true
        },
        password2:{
        	required:true,
        	equalTo:"#password"
        } ,
        username:{
        	required:true,
        },
        email:{
        	required:true,
        	email:true
        }
    },
    messages:{
    	name:{
            required:"用户名不能为空"
        },
        password:{
            required: "密码不能为空"
        },
        password2:{
        	required: "确认密码必须和密码一样"
        } ,
        username:{
        	required: "用户昵称不能为空"
        },
        email:{
        	required: "邮箱格式不正确"
        }
    },
    errorElement: "em"
});

// 表单提交
$("#register").click(function(){
	var flag = $("#form-signin").valid();
	if(!flag){
		//没有通过验证
		alert("没有通过验证");
        return;
	}
	var data = $("#form-signin").serialize();
	$.ajax({
		url:"user/register",
		type:"post",
		data:data,
		dataType:"json",
		success:function(message){
			console.log(message);
			console.log(message.status_code);
			console.log(message.message);
			if(message.status_code == 200){
				$("#message").css("color","green");
				setTimeout(function(){

					location.href = "${path}";
				},1000) ;
				
			}else{
				$("#message").css("color","red");
			}
			$("#message").text(message.message);
		}
	});
});
</script>
3.后端User模块的创建准备
  1. 首先我们在entity包下创建 实体类：USers.java
package com.dzb.entity;

import java.util.Date;

/**
 * Bean ： Users实体类
 * @author dzb
 */
public class Users {
	
	private Integer uid; // 用户编号
	private String name ; // 用户名
	private String email; // 邮箱地址
	private Integer status ; // 用户状态： 1 表示普通用户，0 表示管理员
	private String username; // 用户昵称
	private String password ; // 密码
	private Date modifytime; // 修改时间 

	public Users() {}	 // 无参构造一定要加
		
	public Users(String username, String password) {
		super();
		this.username = username;
		this.password = password;
	}

	public Users(String name, String email, Integer status, String username, String password) {
		super();
		this.name = name;
		this.email = email;
		this.status = status;
		this.username = username;
		this.password = password;
	}

	public Users(String name, String email, Integer status, String username, String password, Date modifytime) {
		this.name = name;
		this.email = email;
		this.status = status;
		this.username = username;
		this.password = password;
		this.modifytime = modifytime;
	}
	
	public Integer getUid() {
		return uid;
	}

	public void setUid(Integer uid) {
		this.uid = uid;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public Integer getStatus() {
		return status;
	}
	public void setStatus(Integer status) {
		this.status = status;
	}
	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 Date getModifytime() {
		return modifytime;
	}
	public void setModifytime(Date modifytime) {
		this.modifytime = modifytime;
	}
	@Override
	public String toString() {
		return "Users [uid=" + uid + ", name=" + name + ", email=" + email + ", status=" + status + ", username="
				+ username + ", password=" + password + ", modifytime=" + modifytime + "]";
	}
}

  1. 和mysql 连接的DruidUtils.java 工具类。所有工具类地址：https://gitee.com/duanxiaobiao/hospital-jsp/tree/master/src/com/dzb/util

  2. 我们还需要创建一个Message类作为我们返回json数据封装的实体类：

package com.dzb.entity;

import java.util.List;
import java.util.Map;

public class Message {
	
	private Integer status_code;
	
	private String message;
	
	private Map<String, List> map;
	
	public Message() {}

	public Message(Integer status_code, String message) {
		super();
		this.status_code = status_code;
		this.message = message;
	}
	public Integer getStatus_code() {
		return status_code;
	}
	public void setStatus_code(Integer status_code) {
		this.status_code = status_code;
	}
	public String getMessage() {
		return message;
	}
	public void setMessage(String message) {
		this.message = message;
	}
	@Override
	public String toString() {
		return "Message [status_code=" + status_code + ", message=" + message + "]";
	}
	public Map<String, List> getMap() {
		return map;
	}
	public void setMap(Map<String, List> map) {
		this.map = map;
	}
}
  1. 实体类和工具类完成后，我们就开始按照顺序建立User模块需要的类：UserServlet --> UserService --> UserServiceImpl --> UserDao --> UserDaoImpl (这种分层，我原意是想仿照springmvc 项目的controller --> service -->serviceImpl -->dao -->mapper分层结构)。注意：要创建在对应的包下。完成后项目节后如下：

hospital09

4.登录逻辑
1.controller层

​ 我们开始编写controller层中UserServlet类中login方法逻辑：我们期望将验证码参数和session中存储的验证码参数向比较，相等则进行登录查询验证，验证成功后将用户数据存储进session中，并设置有效时间。

hospital-login-code

而返回json数据的关键在于：

// 要返回的消息实体
Message message = new Message();
ObjectMapper mapper  = new ObjectMapper();
// 写response
json = mapper.writeValueAsString(message);
response.getWriter().print(json);

UserServlet的login方法的完整逻辑如下：

UserService userService = new UserServiceImpl(); // 这个放置在类序列号下即可

public void login(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException  {
		
    // 设置编码格式
    response.setCharacterEncoding("UTF-8");

    // 消息实体
    Message message = new Message();
    ObjectMapper mapper  = new ObjectMapper();
    String json = null;
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    String verify = request.getParameter("verify");

    HttpSession session = request.getSession();
    String sessionVerify = (String) session.getAttribute("verCode");

    Users user = new Users(username,password);
    HttpSession sessionUser = request.getSession();

    if(!(verify.toLowerCase().equals(sessionVerify))) {
        message.setStatus_code(100);
        message.setMessage("验证码不正确");
    }else {
        boolean isExist = userService.checkUser(user);

        if(isExist) {
            // 存在允许登录;
            message.setStatus_code(200);
            message.setMessage("登录成功");
            System.out.println(user);
            sessionUser.setAttribute("user", user.getUsername());
            sessionUser.setMaxInactiveInterval(1*60*60);
            System.out.println("Session已经设置！一小时后失效.");
        }else {
            // 不存在登录失败;
            message.setStatus_code(100);
            message.setMessage("用户名或密码错误，登录失败");
        }

    }
    // 写response
    json = mapper.writeValueAsString(message);
    response.getWriter().print(json);	
}
2.UserService层

UserService 接口添加 该方法 ：

/***
*   检查用户
* @param user
* @return
*/
boolean checkUser(Users user);
3.UserServiceImpl实现层

UserServiceImpl 实现类添加：

UserDao userDao = new UserDaoImpl();
@Override
public boolean checkUser(Users user) {
    // TODO Auto-generated method stub
    return userDao.checkUser(user);
}
4.UserDao层

UserDao 接口添加 ：

boolean checkUser(Users user);
5.UserDaoImpl 层

UserDaoImpl 添加：

// 获取资源连接
private QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

/**
* 检查用户是否存在
*/
@Override
public boolean checkUser(Users user) {
    String sql = "select * from users where username = ? and password = ?";

    Users u = null;
    try {
    	u = qr.query(sql, new BeanHandler<Users(Users.class),user.getUsername(),user.getPassword());
    } catch (SQLException e) {
    	e.printStackTrace();
    }
    if(u != null) {
    	return true;
    }else {
    	return false;
    }
}
5.注册逻辑

​ 和登录逻辑一样，我就不详细说了。直接粘贴各层代码。

controller层
public void register(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException, IllegalAccessException, InvocationTargetException  {
    // 设置编码格式
    response.setCharacterEncoding("UTF-8");
    // 消息实体
    Message message = new Message();
    ObjectMapper mapper  = new ObjectMapper();
    String json = null;
    String name = request.getParameter("name");
    String password = request.getParameter("password");
    String password2 = request.getParameter("password2");
    String username = request.getParameter("username");
    String email = request.getParameter("email");
    System.out.println("password:" + password);
    System.out.println("password2:" + password2);
    String[] paraArr = new  String[] {name,password,password2,username,email};
    // 检查参数是否为空.
    boolean isEmpty = ParaCheck.isEmpty(paraArr);

    if(isEmpty) {message.setStatus_code(100);message.setMessage("参数不能为空");}

    // 检查用户密码和确认密码是否一致
    boolean isEqual = password.equals(password2);
    if(!isEqual) {
        message.setStatus_code(100);
        message.setMessage("密码和确认密码不一致.");

    }else if(!ParaCheck.emailFormat(email)) { // 检查email格式是否正确。
        message.setStatus_code(100);
        message.setMessage("邮箱格式不合法");
    }else { // 验证后：
        System.out.println("数据通过验证，开始存储数据.");
        Users user = new Users(name,email,1,username,password,new Date());
        // 首先查询是否存在该用户
        boolean isExist = userService.isExistUser(user);
        if(!isExist) {
            // 不存在则注册
            int result = userService.insertUser(user);
            if(result == 1) {
                message.setStatus_code(200);
                message.setMessage("注册成功");
                Map<String ,String> map = new HashMap<String, String>();
                map.put(user.getUsername(),user.getPassword());
                //					message.setMap(map);
            }else {
                // 添加失败
                message.setStatus_code(100);
                message.setMessage("添加失败");
            }

        }else {
            // 存在则返回失败信息
            message.setStatus_code(100);
            message.setMessage("用户昵称已存在！");
        }
    }
    // 写response
    json = mapper.writeValueAsString(message);
    response.getWriter().print(json);
}
Userservice层添加
	/**
	 *  查询是否存在该用户：
	 * @param user
	 * @return
	 */
	boolean isExistUser(Users user);
	
	/**
	 *  添加用户
	 * @param user
	 * @return
	 */
	int insertUser(Users user);
UserServiceImpl层 添加 :
/**
*  查询是否存在用户
*/
@Override
public boolean isExistUser(Users user) {

	return userDao.isExistUser(user);
}

/**
* 添加用户
*/
@Override
public int insertUser(Users user) {
    // TODO Auto-generated method stub
    return userDao.insertUser(user);
}
UserDao层
boolean isExistUser(Users user);

/**
*  添加用户
* @param user
* @return
*/
int insertUser(Users user);
UserDaoImpl 层
/**
*  查询用户是否存在
*/
@Override
public boolean isExistUser(Users user) {
	String sql = "select * from users where username = ? ";
		
    Users u = null;
    try {
        u = qr.query(sql, new BeanHandler<Users>(Users.class),user.getName());
    } catch (SQLException e) {
        e.printStackTrace();
    }
    if(u != null) {
        return true;
    }else {
        return false;
    }

}

/**
*  添加用户
*/
@Override
public int insertUser(Users user) {
    String sql = "insert into users(name,email,status,username,password,modifytime) values(?,?,?,?,?,?)";
    int result = 0;
    try {
        result = qr.update(sql, user.getName(),user.getEmail(),user.getStatus(),user.getUsername(),
                           user.getPassword(),user.getModifytime());
    } catch (SQLException e) {
        System.out.println(e);
        System.out.println("Insert方法添加失败。");
    }
    return result;
}

结尾

第二章实现了项目框架的搭建，图形验证码、登录、注册功能等模块的实现，下一章 构建页面的列表页，分页、增删改查等基本功能。

该篇完整代码地址：https://gitee.com/duanxiaobiao/hospital-jsp

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原文地址：https://www.cnblogs.com/duanxiaobiao/p/14428053.html