Spring Boot快速搭建一个简易商城项目【完成登录功能且优化】

完成登录且优化：

未优化做简单的判断：

全部异常抓捕

优化：返回的是json的格式

BusinessException：所有的错误放到这个容器中，全局异常从这个类中调用

BusinessException：

package com.lya.lyaspshop.exception;

import com.lya.lyaspshop.resp.JsonResponseStatus;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.NoArgsConstructor;

@EqualsAndHashCode(callSuper = true)//自动生成equals和hashCode方法
@AllArgsConstructor//自动生成全参构造函数
@NoArgsConstructor//自动生成无参构造函数
@Data//自动生成getters、setters、toString
public class BusinessException extends RuntimeException {

//    所有的错误放到这个容器中，全局异常从这个类中调用
    private JsonResponseStatus jsonResponseStatus;

}

GlobalExceptionHandler

package com.lya.lyaspshop.exception;

import com.lya.lyaspshop.resp.JsonResponseBody;
import com.lya.lyaspshop.resp.JsonResponseStatus;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

@RestControllerAdvice//用于声明这个类是一个全局异常处理器
@Slf4j
public class GlobalExceptionHandler {

//    已知错误
    @ExceptionHandler(BusinessException.class)//声明这是一个异常处理方法
    public JsonResponseBody<?> exceptionBusinessException(BusinessException e) {
        JsonResponseStatus status = e.getJsonResponseStatus();
        log.info(status.getMsg());//使用日志打印异常的消息。
        return JsonResponseBody.other(status);
    }

//    未知错误
    @ExceptionHandler(Throwable.class)
    public JsonResponseBody<?> exceptionThrowable(Throwable e) {
        log.info(e.getMessage());//使用日志打印异常的消息。
        return JsonResponseBody.other(JsonResponseStatus.UN_KNOWN);
    }
}

这里为啥要写这两个类：

理解：编写 GlobalExceptionHandler 类可以集中处理应用程序中的各种异常，提高代码的可维护性，同时简化了代码

jsr303

//这里体现了为啥要建这个类：1.降低代码耦合度：VO 实体类可以将数据从数据库实体类中解耦           2.用户进行权限校验等操作，业务逻辑与数据访问层分离开来，提高代码的可读性和可维护性
如果我直接在数据库的实体类中去

<!-- jsr303 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

实体：使用注解

@NotBlank

抛一个异常：

报错信息：

这个是时候错误已经该变：

连接日志查看：

遇到一个问题：这里就是异常就是使用的303自己带的异常，不要写其他的

前后台的加密过程：

从前台发送请求来：

引入加密js

		<script src="http://www.gongjuji.net/Content/files/jquery.md5.js" type="text/javascript"></script>

加密成功：

加密后数据库的原密码肯定是不对的了。这我们使用debug给截取到密码存入数据库中。

集成redis

<!--        redis-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

RedisServiceImpl 

package com.lya.lyaspshop.service.impl;

import com.lya.lyaspshop.pojo.User;
import com.lya.lyaspshop.service.IRedisService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

@Service
public class RedisServiceImpl implements IRedisService {

    @Autowired
    private RedisTemplate<String, Object> redisTemplate;

//    往redis设置
    @Override
    public void setUserToRedis(String token, User user) {
        redisTemplate.opsForValue().set("user:" + token, user, 7200, TimeUnit.SECONDS);
    }

    @Override
    public User getUserByToken(String token) {
        return (User) redisTemplate.opsForValue().get("user:" + token);
    }

}

IRedisService

package com.lya.lyaspshop.service;


import com.lya.lyaspshop.pojo.User;

public interface IRedisService {

    /**
     * 将登陆User对象保存到Redis中，并以Token为键
     */
    void setUserToRedis(String token, User user);

    /**
     * 根据token令牌获取redis中存储的user对象
     */
    User getUserByToken(String token);
    
}

redisService.setUserToRedis(token, one);

加入cookie

使用CookieUtils类：

package com.lya.lyaspshop.utils;

import lombok.extern.slf4j.Slf4j;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;

@Slf4j
public class CookieUtils {

    /**
     * @Description: 得到Cookie的值, 不编码
     */
    public static String getCookieValue(HttpServletRequest request, String cookieName) {
        return getCookieValue(request, cookieName, false);
    }

    /**
     * @Description: 得到Cookie的值
     */
    public static String getCookieValue(HttpServletRequest request, String cookieName, boolean isDecoder) {
        Cookie[] cookieList = request.getCookies();
        if (cookieList == null || cookieName == null) {
            return null;
        }
        String retValue = null;
        try {
            for (int i = 0; i < cookieList.length; i++) {
                if (cookieList[i].getName().equals(cookieName)) {
                    if (isDecoder) {
                        retValue = URLDecoder.decode(cookieList[i].getValue(), "UTF-8");
                    } else {
                        retValue = cookieList[i].getValue();
                    }
                    break;
                }
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return retValue;
    }

    /**
     * @Description: 得到Cookie的值
     */
    public static String getCookieValue(HttpServletRequest request, String cookieName, String encodeString) {
        Cookie[] cookieList = request.getCookies();
        if (cookieList == null || cookieName == null) {
            return null;
        }
        String retValue = null;
        try {
            for (int i = 0; i < cookieList.length; i++) {
                if (cookieList[i].getName().equals(cookieName)) {
                    retValue = URLDecoder.decode(cookieList[i].getValue(), encodeString);
                    break;
                }
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return retValue;
    }

    /**
     * @Description: 设置Cookie的值 不设置生效时间默认浏览器关闭即失效,也不编码
     */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
                                 String cookieValue) {
        setCookie(request, response, cookieName, cookieValue, -1);
    }

    /**
     * @param request
     * @param response
     * @param cookieName
     * @param cookieValue
     * @param cookieMaxage
     * @Description: 设置Cookie的值 在指定时间内生效,但不编码
     */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
                                 String cookieValue, int cookieMaxage) {
        setCookie(request, response, cookieName, cookieValue, cookieMaxage, false);
    }

    /**
     * @Description: 设置Cookie的值 不设置生效时间,但编码
     * 在服务器被创建，返回给客户端，并且保存客户端
     * 如果设置了SETMAXAGE(int seconds)，会把cookie保存在客户端的硬盘中
     * 如果没有设置，会默认把cookie保存在浏览器的内存中
     * 一旦设置setPath()：只能通过设置的路径才能获取到当前的cookie信息
     */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
                                 String cookieValue, boolean isEncode) {
        setCookie(request, response, cookieName, cookieValue, -1, isEncode);
    }

    /**
     * @Description: 设置Cookie的值 在指定时间内生效, 编码参数
     */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
                                 String cookieValue, int cookieMaxage, boolean isEncode) {
        doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, isEncode);
    }

    /**
     * @Description: 设置Cookie的值 在指定时间内生效, 编码参数(指定编码)
     */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
                                 String cookieValue, int cookieMaxage, String encodeString) {
        doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, encodeString);
    }

    /**
     * @Description: 删除Cookie带cookie域名
     */
    public static void deleteCookie(HttpServletRequest request, HttpServletResponse response,
                                    String cookieName) {
        doSetCookie(request, response, cookieName, null, -1, false);
    }


    /**
     * @Description: 设置Cookie的值，并使其在指定时间内生效
     */
    private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response,
                                          String cookieName, String cookieValue, int cookieMaxage, boolean isEncode) {
        try {
            if (cookieValue == null) {
                cookieValue = "";
            } else if (isEncode) {
                cookieValue = URLEncoder.encode(cookieValue, "utf-8");
            }
            Cookie cookie = new Cookie(cookieName, cookieValue);
            if (cookieMaxage > 0)
                cookie.setMaxAge(cookieMaxage);
            if (null != request) {// 设置域名的cookie
                String domainName = getDomainName(request);
                log.info("========== domainName: {} ==========", domainName);
                if (!"localhost".equals(domainName)) {
                    cookie.setDomain(domainName);
                }
            }
            cookie.setPath("/");
            response.addCookie(cookie);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * @Description: 设置Cookie的值，并使其在指定时间内生效
     */
    private static void doSetCookie(HttpServletRequest request, HttpServletResponse response,
                                    String cookieName, String cookieValue, int cookieMaxage, String encodeString) {
        try {
            if (cookieValue == null) {
                cookieValue = "";
            } else {
                cookieValue = URLEncoder.encode(cookieValue, encodeString);
            }
            Cookie cookie = new Cookie(cookieName, cookieValue);
            if (cookieMaxage > 0)
                cookie.setMaxAge(cookieMaxage);
            if (null != request) {// 设置域名的cookie
                String domainName = getDomainName(request);
                log.info("========== domainName: {} ==========", domainName);
                if (!"localhost".equals(domainName)) {
                    cookie.setDomain(domainName);
                }
            }
            cookie.setPath("/");
            response.addCookie(cookie);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * @Description: 得到cookie的域名
     */
    private static String getDomainName(HttpServletRequest request) {
        String domainName = null;

        String serverName = request.getRequestURL().toString();
        if (serverName == null || serverName.equals("")) {
            domainName = "";
        } else {
            serverName = serverName.toLowerCase();
            serverName = serverName.substring(7);
            final int end = serverName.indexOf("/");
            serverName = serverName.substring(0, end);
            if (serverName.indexOf(":") > 0) {
                String[] ary = serverName.split("\\:");
                serverName = ary[0];
            }

            final String[] domains = serverName.split("\\.");
            int len = domains.length;
            if (len > 3 && !isIp(serverName)) {
                // www.xxx.com.cn
                domainName = "." + domains[len - 3] + "." + domains[len - 2] + "." + domains[len - 1];
            } else if (len <= 3 && len > 1) {
                // xxx.com or xxx.cn
                domainName = "." + domains[len - 2] + "." + domains[len - 1];
            } else {
                domainName = serverName;
            }
        }
        return domainName;
    }

    public static String trimSpaces(String IP) {//去掉IP字符串前后所有的空格
        while (IP.startsWith(" ")) {
            IP = IP.substring(1, IP.length()).trim();
        }
        while (IP.endsWith(" ")) {
            IP = IP.substring(0, IP.length() - 1).trim();
        }
        return IP;
    }

    public static boolean isIp(String IP) {//判断是否是一个IP
        boolean b = false;
        IP = trimSpaces(IP);
        if (IP.matches("\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}")) {
            String s[] = IP.split("\\.");
            if (Integer.parseInt(s[0]) < 255)
                if (Integer.parseInt(s[1]) < 255)
                    if (Integer.parseInt(s[2]) < 255)
                        if (Integer.parseInt(s[3]) < 255)
                            b = true;
        }
        return b;
    }

}

自定义注解

根据@isNoblank去写：

这三行代码必须写的：

    boolean require() default false;

    String expr() default "";

    String message() default "";

IsMobile

package com.lya.lyaspshop.core;


import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Documented
@Constraint(validatedBy = {IsMobileConstraintValidator.class})
@Target({FIELD})
@Retention(RUNTIME)
public @interface IsMobile {

    boolean require() default false;

    String expr() default "";


    String message() default "";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};

}

IsMobileConstraintValidator 

package com.lya.lyaspshop.core;

import com.baomidou.mybatisplus.core.toolkit.StringUtils;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

/**
 * @author CloudJun
 */
public class IsMobileConstraintValidator implements ConstraintValidator<IsMobile, String> {

    private boolean require;
    private String expr;

    @Override
    public void initialize(IsMobile isMobile) {
        expr = isMobile.expr();
        require = isMobile.require();
    }

    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
        if (!require) return true;
        if (StringUtils.isEmpty(value)) return false;
        return value.matches(expr);
    }






}

优化：定义一个常量类（使用的定值往这里调用就行)

package com.lya.lyaspshop.core;

public abstract class Constants {
    
//    常类

    public static final String EXPR_MOBILE = "(13[0-9]|14[01456879]|15[0-35-9]|16[2567]|17[0-8]|18[0-9]|19[0-35-9])\\d{8}";
    public static final String EXPR_PASSWORD = "[a-zA-Z0-9]{32}";
    public static final String USER_TOKEN_PREFIX = "user:";

}

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