海量数据处理商用短链接生成器平台

第二章短链平台项目创建+git代码管理+开发分层规范

第1集短链平台实战-Maven聚合工程创建微服务项目

**简介：Maven聚合工程创建微服务项目实战 **

Maven聚合工程拆分
- dcloud-common
  - 公共依赖包
- dcloud-app
  - Flink+Kafka实时计算
- dcloud-account
  - 账号+流量包微服务
- dcloud-data
  - 数据可视化微服务
- dcloud-gateway
  - 业务网关
- dcloud-link
  - 短链微服务
- dcloud-shop
  - 流量包商品+支付微服务
创建项目(记得删除聚合工程src目录)
添加依赖

  <properties><!--JDK版本，如果是jdk8则这里是 1.8--><java.version>11</java.version><maven.compiler.source>11</maven.compiler.source><maven.compiler.target>11</maven.compiler.target><spring.boot.version>2.5.5</spring.boot.version><spring.cloud.version>2020.0.4</spring.cloud.version><alibaba.cloud.version>2021.1</alibaba.cloud.version><mybatisplus.boot.starter.version>3.4.0</mybatisplus.boot.starter.version><lombok.version>1.18.16</lombok.version><commons.lang3.version>3.9</commons.lang3.version><commons.codec.version>1.15</commons.codec.version><xxl-job.version>2.3.0</xxl-job.version><aliyun.oss.version>3.10.2</aliyun.oss.version><captcha.version>1.1.0</captcha.version><docker.image.prefix>dcloud</docker.image.prefix><redission.version>3.10.1</redission.version><jwt.version>0.7.0</jwt.version><sharding-jdbc.version>4.1.1</sharding-jdbc.version><!--跳过单元测试--><skipTests>true</skipTests><junit.version>4.12</junit.version><druid.version>1.1.16</druid.version></properties><!--锁定版本--><dependencyManagement><dependencies><!--https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-dependencies/2.3.3.RELEASE--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><version>${spring.boot.version}</version><type>pom</type><scope>import</scope></dependency><!--https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-dependencies/Hoxton.SR8--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring.cloud.version}</version><type>pom</type><scope>import</scope></dependency><!--https://mvnrepository.com/artifact/com.alibaba.cloud/spring-cloud-alibaba-dependencies/2.2.1.RELEASE--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-alibaba-dependencies</artifactId><version>${alibaba.cloud.version}</version><type>pom</type><scope>import</scope></dependency><!--mybatis plus和springboot整合--><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>${mybatisplus.boot.starter.version}</version></dependency><!--https://mvnrepository.com/artifact/org.projectlombok/lombok/1.18.16--><!--scope=provided，说明它只在编译阶段生效，不需要打入包中, Lombok在编译期将带Lombok注解的Java文件正确编译为完整的Class文件--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>${lombok.version}</version><!--<scope>provided</scope>--></dependency><!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 --><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>${commons.lang3.version}</version></dependency><!-- https://mvnrepository.com/artifact/commons-codec/commons-codec --><!--用于加密--><dependency><groupId>commons-codec</groupId><artifactId>commons-codec</artifactId><version>${commons.codec.version}</version></dependency><!--验证码kaptcha依赖包--><dependency><groupId>com.baomidou</groupId><artifactId>kaptcha-spring-boot-starter</artifactId><version>${captcha.version}</version></dependency><!--阿里云oss--><dependency><groupId>com.aliyun.oss</groupId><artifactId>aliyun-sdk-oss</artifactId><version>${aliyun.oss.version}</version></dependency><!-- JWT相关 --><dependency><groupId>io.jsonwebtoken</groupId><artifactId>jjwt</artifactId><version>${jwt.version}</version></dependency><!--分布式锁--><dependency><groupId>org.redisson</groupId><artifactId>redisson</artifactId><version>${redission.version}</version></dependency><!--https://mvnrepository.com/artifact/org.apache.shardingsphere/sharding-jdbc-spring-boot-starter--><dependency><groupId>org.apache.shardingsphere</groupId><artifactId>sharding-jdbc-spring-boot-starter</artifactId><version>${sharding-jdbc.version}</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>${junit.version}</version></dependency><!-- https://mvnrepository.com/artifact/com.xuxueli/xxl-job-core --><dependency><groupId>com.xuxueli</groupId><artifactId>xxl-job-core</artifactId><version>${xxl-job.version}</version></dependency></dependencies></dependencyManagement><!-- 代码库 --><repositories><repository><id>maven-ali</id><url>http://maven.aliyun.com/nexus/content/groups/public//</url><releases><enabled>true</enabled></releases><snapshots><enabled>true</enabled><updatePolicy>always</updatePolicy><checksumPolicy>fail</checksumPolicy></snapshots></repository></repositories><pluginRepositories><pluginRepository><id>public</id><name>aliyun nexus</name><url>http://maven.aliyun.com/nexus/content/groups/public/</url><releases><enabled>true</enabled></releases><snapshots><enabled>false</enabled></snapshots></pluginRepository></pluginRepositories><!--module不用添加打包版本信息--><build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>2.1</version><configuration><skip>true</skip></configuration></plugin><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>${spring.boot.version}</version><configuration><fork>true</fork><addResources>true</addResources></configuration></plugin></plugins></build>

第2集 Gitee仓库介绍和项目纳入版本管理+ignore文件配置

简介：开源中国Gitee仓库-介绍和项目纳入版本管理+ignore文件配置置

Git介绍
- 是一个版本管理工具, 其作用就是可以让你更好的管理你的程序，比如你原来提交过的内容，以后虽然修改了，但是通过git这个工具，可以把你原来提交的内容重现出来，这样对于你后来才意识到的一些错误的更改，可以进行还原
基于git协议的代码仓库
- github 全球最大同性交友社区
- gitee 开源中国
- gitlab 开源的git仓库平台，阿里等大厂就是基于这个搭建
- codeup 阿里云上的免费git仓库
gitee仓库地址
- https://gitee.com/
大课项目必须用git吗？
- 如果是因为不会git，而不用则不行，因为这个是互联网公司必备的
- 可以看联系客服看小滴课堂 git+gitlab专题视频
本地安装文档
- https://www.runoob.com/git/git-install-setup.html
- https://git-scm.com/book/zh/v2/%E8%B5%B7%E6%AD%A5-%E5%AE%89%E8%A3%85-Git
大课项目加入git管理（是公钥设置，不是秘钥设置）
- 本地生成公钥 ssh-keygen -t rsa -C “794666918@qq.com”
  - 生成公钥文档：https://gitee.com/help/articles/4181
  - 设置公钥文档：https://gitee.com/help/articles/4191#article-header0
- 进入项目目录
配置gitignore文件
- 根目录创建文件 .gitignore

# Compiled class file
*.class# Log file
*.log# BlueJ files
*.ctxt# Mobile Tools for Java (J2ME)
.mtj.tmp/# Package Files #
*.jar
*.war
*.nar
*.ear
*.zip
*.tar.gz
*.rar
.DS_Store
.idea
# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
hs_err_pid*

在这里插入图片描述

第3集阿里编码规范里面Manager分层介绍-和开发规范说明

简介：阿里编码规范里面Manager分层介绍-专用名词和POJO实体类约定

开发人员：张三、李四、王五
一定要避免单点故障
- 一个微服务起码两个人熟悉：一个是主程一个是技术leader ,推荐是团队里面两个开发人员
N方库说明

一方库: 本工程内部子项目模块依赖的库(jar 包)。
二方库: 公司内部发布到中央仓库，可供公司内部其它应用依赖的库(jar包)。
三方库: 公司之外的开源库(jar 包)。

POJO实体类

POJO(Plain Ordinary Java Object): 在手册中，POJO 专指只有 setter / getter / toString的简单类，包括DO/DTO/BO/VO等, 禁止命名成xxxPOJO

各个层级约束规范

A) Service/DAO层方法命名规约1) 获取单个对象的方法用get做前缀。2) 获取多个对象的方法用list做前缀，复数形式结尾如:listObjects。 3) 获取统计值的方法用count做前缀。4) 插入的方法用save/insert做前缀。5) 删除的方法用remove/delete做前缀。6) 修改的方法用update做前缀。B) 领域模型命名规约1) 数据对象:xxxDO，xxx即为数据表名。2) 一般数据传输对象:xxxDTO，xxx为业务领域相关的名称，项目里面也用VO。 3) 展示对象:xxxVO，也就是响应给前端的实体包装类。4) 接收前端json对象请求的命名为 XXXRequest

Manager分层说明通用业务处理层，它有如下特征
- 对第三方平台封装的层，预处理返回结果及转化异常信息
- 对Service层通用能力的下沉，如缓存方案、中间件通用处理;
- 与DAO层交互，对多个DAO的组合复用。

在这里插入图片描述

更多开发规范，可以参考阿里巴巴编码手册（资料里面有第6章第3集资料里面）
- 有兴趣也可以安装IDEA编码扫描插件，不过前期可以先不用开启，会影响电脑卡顿和强迫症

第4集 dcloud-common通用模块配置使用实战和新版改动

简介：短链平台dcloud-common通用模块配置使用实战

pom文件配置

    <dependencies><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency><!--项目中添加 spring-boot-starter--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--数据库连接--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!--mybatis plus--><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId></dependency><!--单元测试--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId></dependency><!--redis客户端--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId><exclusions><exclusion><groupId>io.lettuce</groupId><artifactId>lettuce-core</artifactId></exclusion></exclusions></dependency><dependency><groupId>redis.clients</groupId><artifactId>jedis</artifactId></dependency><!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 --><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId></dependency><!--用于加密--><dependency><groupId>commons-codec</groupId><artifactId>commons-codec</artifactId></dependency><!-- JWT相关 --><dependency><groupId>io.jsonwebtoken</groupId><artifactId>jjwt</artifactId></dependency><!--redisson分布式锁--><dependency><groupId>org.redisson</groupId><artifactId>redisson</artifactId></dependency><!--Hoxton.M2版本之后不再使用Ribbon而是使用spring-cloud-loadbalancer，所以不引入spring-cloud-loadbalancer会报错，所以加入spring-cloud-loadbalancer依赖 并且在nacos中排除ribbon依赖，不然loadbalancer无效 --><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId><exclusions><exclusion><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-ribbon</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-loadbalancer</artifactId></dependency><!--配置中心， 留坑，后续用的时候再讲--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId></dependency><!--Feign远程调用--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId></dependency><!--限流依赖--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-sentinel</artifactId></dependency><!--限流持久化到nacos--><dependency><groupId>com.alibaba.csp</groupId><artifactId>sentinel-datasource-nacos</artifactId></dependency><!--Springboot项目整合spring-kafka依赖包配置--><dependency><groupId>org.springframework.kafka</groupId><artifactId>spring-kafka</artifactId></dependency><!--引入AMQP--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-amqp</artifactId></dependency><!--spring cache依赖包--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-cache</artifactId></dependency><dependency><groupId>org.apache.shardingsphere</groupId><artifactId>sharding-jdbc-spring-boot-starter</artifactId></dependency><!-- https://mvnrepository.com/artifact/com.xuxueli/xxl-job-core --><!--分布式调度--><dependency><groupId>com.xuxueli</groupId><artifactId>xxl-job-core</artifactId></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId></dependency></dependencies>

第5集统一接口响应协议-响应工具类封装

简介：统一接口响应协议和响应工具类封装

统一业务状态码 BizCodeEnum开发
- 状态码定义约束，共6位数，前三位代表服务，后3位代表接口
- 比如商品服务210

/*** ** @Description 状态码定义约束，共6位数，前三位代表服务，后3位代表接口*  比如 商品服务210,购物车是220、用户服务230，403代表权限***/
public enum BizCodeEnum {/*** 短链分组*/GROUP_REPEAT(23001,"分组名重复"),GROUP_OPER_FAIL(23503,"分组名操作失败"),GROUP_NOT_EXIST(23404,"分组不存在"),/***验证码*/CODE_TO_ERROR(240001,"接收号码不合规"),CODE_LIMITED(240002,"验证码发送过快"),CODE_ERROR(240003,"验证码错误"),CODE_CAPTCHA_ERROR(240101,"图形验证码错误"),/*** 账号*/ACCOUNT_REPEAT(250001,"账号已经存在"),ACCOUNT_UNREGISTER(250002,"账号不存在"),ACCOUNT_PWD_ERROR(250003,"账号或者密码错误"),ACCOUNT_UNLOGIN(250004,"账号未登录"),/*** 短链*/SHORT_LINK_NOT_EXIST(260404,"短链不存在"),/*** 订单*/ORDER_CONFIRM_PRICE_FAIL(280002,"创建订单-验价失败"),ORDER_CONFIRM_REPEAT(280008,"订单恶意-重复提交"),ORDER_CONFIRM_TOKEN_EQUAL_FAIL(280009,"订单令牌缺少"),ORDER_CONFIRM_NOT_EXIST(280010,"订单不存在"),/*** 支付*/PAY_ORDER_FAIL(300001,"创建支付订单失败"),PAY_ORDER_CALLBACK_SIGN_FAIL(300002,"支付订单回调验证签失败"),PAY_ORDER_CALLBACK_NOT_SUCCESS(300003,"支付宝回调更新订单失败"),PAY_ORDER_NOT_EXIST(300005,"订单不存在"),PAY_ORDER_STATE_ERROR(300006,"订单状态不正常"),PAY_ORDER_PAY_TIMEOUT(300007,"订单支付超时"),/*** 流控操作*/CONTROL_FLOW(500101,"限流控制"),CONTROL_DEGRADE(500201,"降级控制"),CONTROL_AUTH(500301,"认证控制"),/*** 流量包操作*/TRAFFIC_FREE_NOT_EXIST(600101,"免费流量包不存在，联系客服"),TRAFFIC_REDUCE_FAIL(600102,"流量不足，扣减失败"),TRAFFIC_EXCEPTION(600103,"流量包数据异常,用户无流量包"),/*** 通用操作码*/OPS_REPEAT(110001,"重复操作"),OPS_NETWORK_ADDRESS_ERROR(110002,"网络地址错误"),/*** 文件相关*/FILE_UPLOAD_USER_IMG_FAIL(700101,"用户头像文件上传失败");@Getterprivate String message;@Getterprivate int code;private BizCodeEnum(int code, String message){this.code = code;this.message = message;}
}

接口统一协议 JsonData工具类开发

@Data
@AllArgsConstructor
@NoArgsConstructor
public class JsonData {/*** 状态码 0 表示成功*/private Integer code;/*** 数据*/private Object data;/*** 描述*/private String msg;/***  获取远程调用数据*  注意事项：*      支持多单词下划线专驼峰（序列化和反序列化）*** @param typeReference* @param <T>* @return*/public <T> T getData(TypeReference<T> typeReference){return JSON.parseObject(JSON.toJSONString(data),typeReference);}/*** 成功，不传入数据* @return*/public static JsonData buildSuccess() {return new JsonData(0, null, null);}/***  成功，传入数据* @param data* @return*/public static JsonData buildSuccess(Object data) {return new JsonData(0, data, null);}/*** 失败，传入描述信息* @param msg* @return*/public static JsonData buildError(String msg) {return new JsonData(-1, null, msg);}/*** 自定义状态码和错误信息* @param code* @param msg* @return*/public static JsonData buildCodeAndMsg(int code, String msg) {return new JsonData(code, null, msg);}/*** 传入枚举，返回信息* @param codeEnum* @return*/public static JsonData buildResult(BizCodeEnum codeEnum){return JsonData.buildCodeAndMsg(codeEnum.getCode(),codeEnum.getMessage());}
}

第6集微服务自定义全局异常+处理器handler开发

简介：自定义全局异常+处理器开发

自定义全局异常

/*** 全局异常处理*/
@Data
public class BizException extends RuntimeException {private Integer code;private String msg;public BizException(Integer code, String message) {super(message);this.code = code;this.msg = message;}public BizException(BizCodeEnum bizCodeEnum) {super(bizCodeEnum.getMsg());this.code = bizCodeEnum.getCode();this.msg = bizCodeEnum.getMsg();}}

自定义异常处理器

@ControllerAdvice
@Slf4j
public class ExceptionHandle {@ExceptionHandler(value = Exception.class)@ResponseBodypublic JsonData handle(Exception e) {if (e instanceof BizException) {BizException bizException = (BizException) e;log.info("[业务异常]{}", e);return JsonData.buildError(bizException.getMsg(), bizException.getCode());} else {log.info("[系统异常]{}", e);return JsonData.buildError("全局异常，未知错误");}}
}

第7集 common通用工具和时间格式化工具类

简介：common通用工具和时间格式化工具类讲解

时间格式化工具类封装

public class TimeUtil {/*** 默认日期格式*/private static final String DEFAULT_PATTERN = "yyyy-MM-dd HH:mm:ss";/*** 默认日期格式*/private static final DateTimeFormatter DEFAULT_DATE_TIME_FORMATTER  = DateTimeFormatter.ofPattern(DEFAULT_PATTERN);private static final  ZoneId DEFAULT_ZONE_ID = ZoneId.systemDefault();/*** LocalDateTime 转 字符串，指定日期格式* @param time* @param pattern* @return*/public static String format(LocalDateTime localDateTime,String pattern){DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);String timeStr = formatter.format(localDateTime.atZone(DEFAULT_ZONE_ID));return timeStr;}/*** Date 转 字符串, 指定日期格式* @param time* @param pattern* @return*/public static String format(Date time,String pattern){DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);String timeStr = formatter.format(time.toInstant().atZone(DEFAULT_ZONE_ID));return timeStr;}/***  Date 转 字符串，默认日期格式* @param time* @return*/public static String format(Date time){String timeStr = DEFAULT_DATE_TIME_FORMATTER.format(time.toInstant().atZone(DEFAULT_ZONE_ID));return timeStr;}/*** timestamp 转 字符串，默认日期格式** @param time* @return*/public static String format(long timestamp) {String timeStr = DEFAULT_DATE_TIME_FORMATTER.format(new Date(timestamp).toInstant().atZone(DEFAULT_ZONE_ID));return timeStr;}/*** 字符串 转 Date** @param time* @return*/public static Date strToDate(String time) {LocalDateTime localDateTime = LocalDateTime.parse(time, DEFAULT_DATE_TIME_FORMATTER);return Date.from(localDateTime.atZone(DEFAULT_ZONE_ID).toInstant());}/*** 获取当天剩余的秒数,用于流量包过期配置* @param currentDate* @return*/public static Integer getRemainSecondsOneDay(Date currentDate) {LocalDateTime midnight = LocalDateTime.ofInstant(currentDate.toInstant(),ZoneId.systemDefault()).plusDays(1).withHour(0).withMinute(0).withSecond(0).withNano(0);LocalDateTime currentDateTime = LocalDateTime.ofInstant(currentDate.toInstant(),ZoneId.systemDefault());long seconds = ChronoUnit.SECONDS.between(currentDateTime, midnight);return (int) seconds;}
}

Json序列化工具类封装

public class JsonUtil {private static final ObjectMapper mapper = new ObjectMapper();static {//设置可用单引号mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);//序列化的时候序列对象的所有属性mapper.setSerializationInclusion(JsonInclude.Include.ALWAYS);//反序列化的时候如果多了其他属性,不抛出异常mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);//如果是空对象的时候,不抛异常mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);//取消时间的转化格式,默认是时间戳,可以取消,同时需要设置要表现的时间格式mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));}/*** 对象转为Json字符串* @param data* @return*/public static String obj2Json(Object obj) {String jsonStr = null;try {jsonStr = mapper.writeValueAsString(obj);} catch (JsonProcessingException e) {e.printStackTrace();}return jsonStr;}/*** json字符串转为对象* @param str* @param valueType* @return*/public static <T> T json2Obj(String jsonStr, Class<T> beanType) {T obj = null;try {obj = mapper.readValue(jsonStr, beanType);} catch (Exception e){e.printStackTrace();}return obj;}/*** json数据转换成pojo对象list* @param jsonData* @param beanType* @return*/public static <T> List<T> json2List(String jsonData, Class<T> beanType) {JavaType javaType = mapper.getTypeFactory().constructParametricType(List.class, beanType);try {List<T> list = mapper.readValue(jsonData, javaType);return list;} catch (Exception e) {e.printStackTrace();}return null;}/*** 对象转为byte数组* @param data* @return*/public static byte[] obj2Bytes(Object obj) {byte[] byteArr = null;try {byteArr = mapper.writeValueAsBytes(obj);} catch (JsonProcessingException e) {e.printStackTrace();}return byteArr;}/*** byte数组转为对象* @param byteArr* @param valueType* @return*/public static <T> T bytes2Obj(byte[] byteArr, Class<T> beanType) {T obj = null;try {obj = mapper.readValue(byteArr, beanType);} catch (Exception e) {e.printStackTrace();}return obj;}}

common工具大集合

@Slf4j
public class CommonUtil {/*** 获取ip** @param request* @return*/public static String getIpAddr(HttpServletRequest request) {String ipAddress = null;try {ipAddress = request.getHeader("x-forwarded-for");if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {ipAddress = request.getHeader("Proxy-Client-IP");}if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {ipAddress = request.getHeader("WL-Proxy-Client-IP");}if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {ipAddress = request.getRemoteAddr();if (ipAddress.equals("127.0.0.1")) {// 根据网卡取本机配置的IPInetAddress inet = null;try {inet = InetAddress.getLocalHost();} catch (UnknownHostException e) {e.printStackTrace();}ipAddress = inet.getHostAddress();}}// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割if (ipAddress != null && ipAddress.length() > 15) {// "***.***.***.***".length()// = 15if (ipAddress.indexOf(",") > 0) {ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));}}} catch (Exception e) {ipAddress = "";}return ipAddress;}/*** 获取全部请求头* @param request* @return*/public static Map<String, String> getAllRequestHeader(HttpServletRequest request){Enumeration<String> headerNames = request.getHeaderNames();Map<String, String> map = new HashMap<>();while (headerNames.hasMoreElements()) {String key = (String)headerNames.nextElement();//根据名称获取请求头的值String value = request.getHeader(key);map.put(key,value);}return map;}/*** MD5加密** @param data* @return*/public static String MD5(String data) {try {MessageDigest md = MessageDigest.getInstance("MD5");byte[] array = md.digest(data.getBytes("UTF-8"));StringBuilder sb = new StringBuilder();for (byte item : array) {sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));}return sb.toString().toUpperCase();} catch (Exception exception) {}return null;}/*** 获取验证码随机数** @param length* @return*/public static String getRandomCode(int length) {String sources = "0123456789";Random random = new Random();StringBuilder sb = new StringBuilder();for (int j = 0; j < length; j++) {sb.append(sources.charAt(random.nextInt(9)));}return sb.toString();}/*** 获取当前时间戳** @return*/public static long getCurrentTimestamp() {return System.currentTimeMillis();}/*** 生成uuid** @return*/public static String generateUUID() {return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);}/*** 获取随机长度的串** @param length* @return*/private static final String ALL_CHAR_NUM = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";public static String getStringNumRandom(int length) {//生成随机数字和字母,Random random = new Random();StringBuilder saltString = new StringBuilder(length);for (int i = 1; i <= length; ++i) {saltString.append(ALL_CHAR_NUM.charAt(random.nextInt(ALL_CHAR_NUM.length())));}return saltString.toString();}/*** 响应json数据给前端** @param response* @param obj*/public static void sendJsonMessage(HttpServletResponse response, Object obj) {response.setContentType("application/json; charset=utf-8");try (PrintWriter writer = response.getWriter()) {writer.print(JsonUtil.obj2Json(obj));response.flushBuffer();} catch (IOException e) {log.warn("响应json数据给前端异常:{}",e);}}}

c String generateUUID() {
return UUID.randomUUID().toString().replaceAll(“-”, “”).substring(0, 32);
}

/*** 获取随机长度的串** @param length* @return*/
private static final String ALL_CHAR_NUM = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";public static String getStringNumRandom(int length) {//生成随机数字和字母,Random random = new Random();StringBuilder saltString = new StringBuilder(length);for (int i = 1; i <= length; ++i) {saltString.append(ALL_CHAR_NUM.charAt(random.nextInt(ALL_CHAR_NUM.length())));}return saltString.toString();
}/*** 响应json数据给前端** @param response* @param obj*/
public static void sendJsonMessage(HttpServletResponse response, Object obj) {response.setContentType("application/json; charset=utf-8");try (PrintWriter writer = response.getWriter()) {writer.print(JsonUtil.obj2Json(obj));response.flushBuffer();} catch (IOException e) {log.warn("响应json数据给前端异常:{}",e);}}

}