Spring Boot非web应用程序实例

逃离我推掉我的手 2022-05-27 09:43 200阅读 0赞

在Spring Boot中，要创建一个非Web应用程序，实现`CommandLineRunner`并覆盖`run()`方法，例如：

import org.springframework.boot.CommandLineRunner; @SpringBootApplication public class SpringBootConsoleApplication implements CommandLineRunner { public static void main(String[] args) throws Exception { SpringApplication.run(SpringBootConsoleApplication.class, args); } //access command line arguments @Override public void run(String... args) throws Exception { //do something } }

Java

## 1. 项目结构 ##

一个标准的Maven项目结构。如下所示 -

## 2. 项目依赖 ##

只有依赖 `spring-boot-starter` 库，参考如下 `pom.xml` -

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.yiibai</groupId>
        <artifactId>spring-boot-non-web</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>spring-boot-non-web</name>
        <url>http://maven.apache.org</url>
    
        <properties>
            <java.version>1.8</java.version>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>3.8.1</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
        </dependencies>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.1.RELEASE</version>
        </parent>
    
        <build>
            <plugins>
                
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    </project>

XML

## 3. Spring ##

返回消息的服务，如下 HelloMessageService.java 代码所示 -

package com.yiibai.service; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Service; @Service public class HelloMessageService { @Value("${name:unknown}") private String name; public String getMessage() { return getMessage(name); } public String getMessage(String name) { return "Hello " + name; } }

Java

属性文件配置文件： application.properties 如下所示 -

name=yiibai

Shell

下面是`CommandLineRunner`示例,如果运行这个Spring Boot，那么`run`方法将是入口点。  
SpringBootConsoleApplication.java 代码内容如下所示 -

package com.yiibai; import com.yiibai.service.HelloMessageService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.Banner; import org.springframework.boot.CommandLineRunner; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import static java.lang.System.exit; @SpringBootApplication public class SpringBootConsoleApplication implements CommandLineRunner { @Autowired private HelloMessageService helloService; public static void main(String[] args) throws Exception { //disabled banner, don't want to see the spring logo SpringApplication app = new SpringApplication(SpringBootConsoleApplication.class); app.setBannerMode(Banner.Mode.OFF); app.run(args); } // Put your logic here. @Override public void run(String... args) throws Exception { if (args.length > 0) { System.out.println(helloService.getMessage(args[0].toString())); } else { System.out.println(helloService.getMessage()); } exit(0); } }

Java

## 4. 实例运行演示 ##

打包上面的项目并运行它，如下命令 -

## Go to project directory
    ## package it
    $ mvn package
    
    $ java -jar target/spring-boot-non-web-0.0.1-SNAPSHOT.jar
    Hello yiibai
    
    $ java -jar target/spring-boot-non-web-0.0.1-SNAPSHOT.jar "Max su"
    Hello Max su