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;
@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.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;
@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



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);
}
}

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

最后

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