Console Application with Spring Boot: Difference between revisions

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Line 1: Line 1:
=External=
* https://www.baeldung.com/spring-boot-console-app
=Internal=
=Internal=


Line 6: Line 10:


=Starter Dependencies=
=Starter Dependencies=
<syntaxhighlight lang='groovy'>
dependencies {
    implementation('org.springframework.boot:spring-boot-starter')
}
</syntaxhighlight>


=Spring Boot Application Class=
=Spring Boot Application Class=
<syntaxhighlight lang='java'>
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class MyCommandLineApplication implements CommandLineRunner {
    public static void main(String[] args) {
        SpringApplication.run(MyCommandLineApplication.class, args);
    }
    @Override
    public void run(String... args) throws Exception {
        System.out.println("running with " + Arrays.asList(args) + " ...");
        new CommandLineLoop().run();
    }
}
</syntaxhighlight>
=Simplest Command Line Loop Implementation=
<syntaxhighlight lang='java'>
package ...;
import java.io.BufferedReader;
import java.io.InputStreamReader;
@SuppressWarnings("WeakerAccess")
public class CommandLineLoop {
    private BufferedReader br;
    public CommandLineLoop() {
        this.br = new BufferedReader(new InputStreamReader(System.in));
    }
    public void run() throws Exception {
        while(true) {
            System.out.print("> ");
            String line = br.readLine().trim();
            if (line.isEmpty()) {
                continue;
            }
            if (line.toLowerCase().startsWith("exit")) {
                break;
            }
        }
    }
}
</syntaxhighlight>

Latest revision as of 17:59, 31 October 2018

External

Internal

Overview

Starter Dependencies

dependencies {
    implementation('org.springframework.boot:spring-boot-starter')
}

Spring Boot Application Class

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MyCommandLineApplication implements CommandLineRunner {

    public static void main(String[] args) {
        SpringApplication.run(MyCommandLineApplication.class, args);
    }

    @Override
    public void run(String... args) throws Exception {

        System.out.println("running with " + Arrays.asList(args) + " ...");

        new CommandLineLoop().run();
    }
}

Simplest Command Line Loop Implementation

package ...;

import java.io.BufferedReader;
import java.io.InputStreamReader;

@SuppressWarnings("WeakerAccess")
public class CommandLineLoop {

    private BufferedReader br;

    public CommandLineLoop() {

        this.br = new BufferedReader(new InputStreamReader(System.in));
    }

    public void run() throws Exception {

        while(true) {

            System.out.print("> ");

            String line = br.readLine().trim();

            if (line.isEmpty()) {

                continue;
            }

            if (line.toLowerCase().startsWith("exit")) {

                break;
            }
        }
    }
}