Spring Boot 非web应用程序实例

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;@SpringBootApplicationpublic 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.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>            <!-- Package as an executable jar/war -->            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build></project>
XML

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;@Servicepublic 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
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;@SpringBootApplicationpublic 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.jarHello yiibai$ java -jar target/spring-boot-non-web-0.0.1-SNAPSHOT.jar "Max su"Hello Max su