Spring Boot 非web应用程序实例（控制台应用程序）

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
    }
}

1. 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.ericgg</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>
            <!-- Package as an executable jar/war -->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

2.  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;
    }
 
}

属性文件配置文件： application.properties 如下所示

name=yiibai

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.ericgg;
 
import com.ericgg.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);
    }
}

3. 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