流水号生成器

pom.xml （复用了之前的pom.xml文件，有引用多的包忽略。）

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

SequenceGenerator.java

package com.xjh;

import java.util.concurrent.atomic.AtomicInteger;

public class SequenceGenerator {

    private String prefix;
    private String suffix;
    private int initial;
    private final AtomicInteger counter = new AtomicInteger();

    public SequenceGenerator() {
    }

    public void setPrefix(String prefix) {
        this.prefix = prefix;
    }

    public void setSuffix(String suffix) {
        this.suffix = suffix;
    }

    public void setInitial(int initial) {
        this.initial = initial;
    }

    public String getSequence() {
        StringBuilder builder = new StringBuilder();
        builder.append(prefix)
                .append(initial)
                .append(counter.getAndIncrement())
                .append(suffix);
        return builder.toString();
    }

}

SequenceGeneratorConfiguration.java

package com.xjh;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class SequenceGeneratorConfiguration {

    @Bean
    public SequenceGenerator sequenceGenerator() {
        SequenceGenerator seqgen = new SequenceGenerator();
        seqgen.setPrefix("SCR");
        seqgen.setSuffix("A");
        seqgen.setInitial(100000);
        return seqgen;
    }

}

Main.java

package com.xjh;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Main {

    public static void main(String[] args) {

        ApplicationContext context = new AnnotationConfigApplicationContext(SequenceGeneratorConfiguration.class);

        SequenceGenerator generator = context.getBean(SequenceGenerator.class);

        for (int i = 1; i <= 5; i++) {
            System.out.println(generator.getSequence());
        }
    }
}

输出结果

C:\Java\jdk1.8.0_321\bin\java.exe "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2022.2.1\lib\idea_rt.jar=64332:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2022.2.1\bin" -Dfile.encoding=UTF-8 -classpath C:\Java\jdk1.8.0_321\jre\lib\charsets.jar;C:\Java\jdk1.8.0_321\jre\lib\deploy.jar;C:\Java\jdk1.8.0_321\jre\lib\ext\access-bridge-64.jar;C:\Java\jdk1.8.0_321\jre\lib\ext\cldrdata.jar;C:\Java\jdk1.8.0_321\jre\lib\ext\dnsns.jar;C:\Java\jdk1.8.0_321\jre\lib\ext\jaccess.jar;C:\Java\jdk1.8.0_321\jre\lib\ext\jfxrt.jar;C:\Java\jdk1.8.0_321\jre\lib\ext\localedata.jar;C:\Java\jdk1.8.0_321\jre\lib\ext\nashorn.jar;C:\Java\jdk1.8.0_321\jre\lib\ext\sunec.jar;C:\Java\jdk1.8.0_321\jre\lib\ext\sunjce_provider.jar;C:\Java\jdk1.8.0_321\jre\lib\ext\sunmscapi.jar;C:\Java\jdk1.8.0_321\jre\lib\ext\sunpkcs11.jar;C:\Java\jdk1.8.0_321\jre\lib\ext\zipfs.jar;C:\Java\jdk1.8.0_321\jre\lib\javaws.jar;C:\Java\jdk1.8.0_321\jre\lib\jce.jar;C:\Java\jdk1.8.0_321\jre\lib\jfr.jar;C:\Java\jdk1.8.0_321\jre\lib\jfxswt.jar;C:\Java\jdk1.8.0_321\jre\lib\jsse.jar;C:\Java\jdk1.8.0_321\jre\lib\management-agent.jar;C:\Java\jdk1.8.0_321\jre\lib\plugin.jar;C:\Java\jdk1.8.0_321\jre\lib\resources.jar;C:\Java\jdk1.8.0_321\jre\lib\rt.jar;D:\xiejiaohui\sping-boot\untitled\target\classes;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-data-jpa\2.7.3\spring-boot-starter-data-jpa-2.7.3.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-aop\2.7.3\spring-boot-starter-aop-2.7.3.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-aop\5.3.22\spring-aop-5.3.22.jar;C:\Users\Administrator\.m2\repository\org\aspectj\aspectjweaver\1.9.7\aspectjweaver-1.9.7.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-jdbc\2.7.3\spring-boot-starter-jdbc-2.7.3.jar;C:\Users\Administrator\.m2\repository\com\zaxxer\HikariCP\4.0.3\HikariCP-4.0.3.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-jdbc\5.3.22\spring-jdbc-5.3.22.jar;C:\Users\Administrator\.m2\repository\jakarta\transaction\jakarta.transaction-api\1.3.3\jakarta.transaction-api-1.3.3.jar;C:\Users\Administrator\.m2\repository\jakarta\persistence\jakarta.persistence-api\2.2.3\jakarta.persistence-api-2.2.3.jar;C:\Users\Administrator\.m2\repository\org\hibernate\hibernate-core\5.6.10.Final\hibernate-core-5.6.10.Final.jar;C:\Users\Administrator\.m2\repository\org\jboss\logging\jboss-logging\3.4.3.Final\jboss-logging-3.4.3.Final.jar;C:\Users\Administrator\.m2\repository\net\bytebuddy\byte-buddy\1.12.13\byte-buddy-1.12.13.jar;C:\Users\Administrator\.m2\repository\antlr\antlr\2.7.7\antlr-2.7.7.jar;C:\Users\Administrator\.m2\repository\org\jboss\jandex\2.4.2.Final\jandex-2.4.2.Final.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\classmate\1.5.1\classmate-1.5.1.jar;C:\Users\Administrator\.m2\repository\org\hibernate\common\hibernate-commons-annotations\5.1.2.Final\hibernate-commons-annotations-5.1.2.Final.jar;C:\Users\Administrator\.m2\repository\org\glassfish\jaxb\jaxb-runtime\2.3.6\jaxb-runtime-2.3.6.jar;C:\Users\Administrator\.m2\repository\org\glassfish\jaxb\txw2\2.3.6\txw2-2.3.6.jar;C:\Users\Administrator\.m2\repository\com\sun\istack\istack-commons-runtime\3.0.12\istack-commons-runtime-3.0.12.jar;C:\Users\Administrator\.m2\repository\com\sun\activation\jakarta.activation\1.2.2\jakarta.activation-1.2.2.jar;C:\Users\Administrator\.m2\repository\org\springframework\data\spring-data-jpa\2.7.2\spring-data-jpa-2.7.2.jar;C:\Users\Administrator\.m2\repository\org\springframework\data\spring-data-commons\2.7.2\spring-data-commons-2.7.2.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-orm\5.3.22\spring-orm-5.3.22.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-context\5.3.22\spring-context-5.3.22.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-tx\5.3.22\spring-tx-5.3.22.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-beans\5.3.22\spring-beans-5.3.22.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-api\1.7.36\slf4j-api-1.7.36.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-aspects\5.3.22\spring-aspects-5.3.22.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-thymeleaf\2.7.3\spring-boot-starter-thymeleaf-2.7.3.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter\2.7.3\spring-boot-starter-2.7.3.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot\2.7.3\spring-boot-2.7.3.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.7.3\spring-boot-autoconfigure-2.7.3.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.7.3\spring-boot-starter-logging-2.7.3.jar;C:\Users\Administrator\.m2\repository\ch\qos\logback\logback-classic\1.2.11\logback-classic-1.2.11.jar;C:\Users\Administrator\.m2\repository\ch\qos\logback\logback-core\1.2.11\logback-core-1.2.11.jar;C:\Users\Administrator\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.17.2\log4j-to-slf4j-2.17.2.jar;C:\Users\Administrator\.m2\repository\org\apache\logging\log4j\log4j-api\2.17.2\log4j-api-2.17.2.jar;C:\Users\Administrator\.m2\repository\org\slf4j\jul-to-slf4j\1.7.36\jul-to-slf4j-1.7.36.jar;C:\Users\Administrator\.m2\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;C:\Users\Administrator\.m2\repository\org\yaml\snakeyaml\1.30\snakeyaml-1.30.jar;C:\Users\Administrator\.m2\repository\org\thymeleaf\thymeleaf-spring5\3.0.15.RELEASE\thymeleaf-spring5-3.0.15.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\thymeleaf\thymeleaf\3.0.15.RELEASE\thymeleaf-3.0.15.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\attoparser\attoparser\2.0.5.RELEASE\attoparser-2.0.5.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\unbescape\unbescape\1.1.6.RELEASE\unbescape-1.1.6.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\thymeleaf\extras\thymeleaf-extras-java8time\3.0.4.RELEASE\thymeleaf-extras-java8time-3.0.4.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.7.3\spring-boot-starter-web-2.7.3.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.7.3\spring-boot-starter-json-2.7.3.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.13.3\jackson-databind-2.13.3.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.13.3\jackson-annotations-2.13.3.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.13.3\jackson-core-2.13.3.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.13.3\jackson-datatype-jdk8-2.13.3.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.13.3\jackson-datatype-jsr310-2.13.3.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.13.3\jackson-module-parameter-names-2.13.3.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.7.3\spring-boot-starter-tomcat-2.7.3.jar;C:\Users\Administrator\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.65\tomcat-embed-core-9.0.65.jar;C:\Users\Administrator\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.65\tomcat-embed-el-9.0.65.jar;C:\Users\Administrator\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.65\tomcat-embed-websocket-9.0.65.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-web\5.3.22\spring-web-5.3.22.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-webmvc\5.3.22\spring-webmvc-5.3.22.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-expression\5.3.22\spring-expression-5.3.22.jar;C:\Users\Administrator\.m2\repository\com\h2database\h2\2.1.214\h2-2.1.214.jar;C:\Users\Administrator\.m2\repository\jakarta\xml\bind\jakarta.xml.bind-api\2.3.3\jakarta.xml.bind-api-2.3.3.jar;C:\Users\Administrator\.m2\repository\jakarta\activation\jakarta.activation-api\1.2.2\jakarta.activation-api-1.2.2.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-core\5.3.22\spring-core-5.3.22.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-jcl\5.3.22\spring-jcl-5.3.22.jar com.xjh.Main
15:40:06.042 [main] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@7c53a9eb
15:40:06.057 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
15:40:06.163 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerProcessor'
15:40:06.164 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory'
15:40:06.165 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor'
15:40:06.166 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor'
15:40:06.170 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalPersistenceAnnotationProcessor'
15:40:06.174 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'sequenceGeneratorConfiguration'
15:40:06.180 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'sequenceGenerator'
SCR1000000A
SCR1000001A
SCR1000002A
SCR1000003A
SCR1000004A

Process finished with exit code 0

本例子来源于《Spring 5 攻略》《Spring 5 Recipes》非常喜欢的一本书，以上为读书笔记。

posted @ 2022-11-12 15:49 Josh_Xie 阅读(285) 评论(0) 编辑收藏举报

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