[JAVA] Easy library introduction with Maven!

Purpose

It is very convenient to prepare a library and build an environment with Maven for development! The procedure is listed below.

download

Download Eclipse or pleiades. There are many commentary sites about this, so I will omit it.

procedure

First, start Eclipse

File-> New-> Create Maven Project

Check to create a simple project

• The following is an example Group Id: Give the project a name Artifact Id: Give the packaging a name Version: Standard is possible Others are left blank as standard

Now that the project is created We will continue to add libraries with Maven!

Library added with Maven

Open pom.xml of the created project

Open "Dependencies" in the center tab and click "Add" in the middle

Then, a screen for entering the information of the library you want to add appears.

Let's add the Jsonic library here http://jsonic.osdn.jp/index.html#maven

If every library has a Maven repository, there is a description like the following, so enter each one.

　　<groupId>net.arnx</groupId>
　　<artifactId>jsonic</artifactId>

Enter the version if you want to include a specific version

Now click OK and go back to the previous screen and the dependency will be added If you save pom.xml in this state, the library will be added.

However, if the version is not entered, it may not be downloaded. In that case, select the property of the one added in the dependency and enter the version.

When you enter, return, and save Maven dependency is increasing and you can see that there is a jar file

The rest is the same as a normal library Can be used as it is

Create a suitable source like this After launching the Maven project, I just edited pom.xml Jsonic has been imported

Testjson.java

package maventest;
import java.util.HashMap;

import net.arnx.jsonic.JSON;

public class Testjson {

	public static void main(String[] args) {
		HashMap<String, String> testdata = new HashMap<String, String>();
		testdata.put("testkey1", "testvalue1");
		testdata.put("testkey2", "testvalue2");
		
		String jsontext = JSON.encode(testdata);
		
		System.out.println(jsontext);
	}

}

When you run the source as a Java application For console-like output!

With Maven, you can easily add a library like this!