Java

Available in Classic and VPC

This section describes how to create and use Java actions in a variety of ways, and includes application examples.

Create an action

Creating Java actions is similar to creating JavaScript and Swift actions.

A Java action is a Java program with a main method. The method must be defined in the following format:

public static com.google.gson.JsonObject main(com.google.gson.JsonObject);

Considering this requirement, here is an example of creating a Java action:

1. Create a source code file named Hello.java.

   import com.google.gson.JsonObject;
   
   public class Hello {
       public static JsonObject main(JsonObject args) {
           String name = "World";
           String place = "Naver";
           if (args.has("name"))
               name = args.getAsJsonPrimitive("name").getAsString();
           if (args.has("place"))
               place = args.getAsJsonPrimitive("place").getAsString();
   
           JsonObject response = new JsonObject();
           response.addProperty("payload", "Hello, " + name + " in " + place + "!");
           return response;
       }
   }
   

2. Use the command to compile Hello.java into a JAR file named hello.jar.

   $ javac Hello.java
   

   $ jar cvf hello.jar Hello.class
   

3. Upload the generated hello.jar file to create an action named helloJava.

Main class: Set to Hello class.

If the class is not in the default package, you can use the Java fully-qualified class name (FQCN) including the package, such as com.example.MyMain.

If you want to change the method name of the Java action, you can create an action by specifying a method name like methodName.