Spring Boot快速搭建一个简易商城项目【完成登录功能且优化】-编程知识

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 {@Autowiredprivate RedisTemplate<String, Object> redisTemplate;//    往redis设置@Overridepublic void setUserToRedis(String token, User user) {redisTemplate.opsForValue().set("user:" + token, user, 7200, TimeUnit.SECONDS);}@Overridepublic 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cookieString 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cookieString 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.cndomainName = "." + domains[len - 3] + "." + domains[len - 2] + "." + domains[len - 1];} else if (len <= 3 && len > 1) {// xxx.com or xxx.cndomainName = "." + 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IPboolean 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;@Overridepublic void initialize(IsMobile isMobile) {expr = isMobile.expr();require = isMobile.require();}@Overridepublic 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:";}