Call API [Preparation]

Call API

It is divided into the following four parts. (Forgive me for the XX edition) Call API [Preparation] Call API [Core] Call API [Handling] Call API [Call]

Preparation

First, prepare the necessary model, Json conversion, and self-made Exception.

--Model: Box for request / response --Json conversion: Convert request / response to Json for API communication --Exception: Create an Exception according to the result and prepare for branching of processing

model

Getter / Setter is omitted

request.java

package model;

public class RequestDto {
	
	/**Outer frame*/
	private RequestBody request;
}

Request contents.java

package model;

public class RequestBody {
	
	/** id */
	private String id;
	/**name*/
	private String name;
	/**Contents*/
	private String info;
}

response.java

package model;

public class ResponseDto {

	/**Processing result*/
	private String resultCode;
	/**Contents*/
	private ResponseBody body;
}

Response contents.java

package model;

public class ResponseBody {
	
	/**Result content*/
	private String info;
	/**comment*/
	private String comment;
}

Json conversion

JsonUtil.java

package json;

import model.RequestDto;
import model.ResponseBody;
import model.RequestBody;
import model.ResponseDto;

public class JsonUtil {
	
	/**
	 *Convert request DTO to Json
	 * 
	 * @param request request DTO
	 * @return Json Converted string
	 */
	public static String requestDtoToJson(RequestDto request) {
		
		RequestBody body = request.getRequest();
		
		String json = 
				"{" + 
					"\"request\": {" + 
						"\"id\": " + body.getId() + "," + 
						"\"name\": " + body.getName() + "," + 
						"\"info\": " + body.getInfo() + 
					"}" + 
				"}";
		
		return json;
	}
	
	/**
	 *Convert response Json to DTO
	 * 
	 * @param json response json
	 * @return Converted DTO
	 */
	public static ResponseDto responseJsonToDto(String json) {
		
		json = 
				"{" +
					"\"resultCode\": 0," +
					"\"body\": {" +
						"\"info\":The result is this('ω')," +
						"\"comment\":It's a comment('ω')" +
					"}" +
				"}";
		
		ResponseBody body = new ResponseBody();
		body.setInfo(getContent(json, "info"));
		body.setComment(getContent(json, "comment"));
		ResponseDto response = new ResponseDto();
		response.setBody(body);
		response.setResultCode(getContent(json, "resultCode"));
		
		return response;
	}
	
	/**
	 *Extract information from Json string
	 * <p>
	 *XXX It's useless if the content contains a resultCode character string or a comma, isn't it?
	 * 
	 * @param json Json string
	 * @param content Parameter name to be cut out
	 * @return Cut out value
	 */
	private static String getContent(String json, String content) {
		return json.split("\"" + content + "\": ")[1].split(",")[0].split("}")[0].trim();
	}
}

The response is focused on ease of use, so this time I've re-entered a fixed value. Well, I think there is a library, so maybe this isn't really necessary?

Self-made Exception

Basis Exception.java

package exception;

public class NantokaApiException extends Exception{

	private static final long serialVersionUID = 1L; 
	
	public NantokaApiException(String msg){
		super(msg);
	}
}

Exception that summarizes unexpected error systems.java

package exception;

public class NantokaApiUnknownException extends NantokaApiException {

	private static final long serialVersionUID = 1L; 
	
	public NantokaApiUnknownException(String msg){
		super(msg);
	}
}

Exception when there is API processing result but it is an error result.java

package exception;

public class NantokaApiBadResultException extends NantokaApiException {

	private static final long serialVersionUID = 1L; 
	
	public NantokaApiBadResultException(String msg){
		super(msg);
	}
}

So it was a preparation Next time I will use these guys to hit the API