Pack API response (java)

Introduction

Recently, it was troublesome to copy and paste the result in the API test and mark it with 〇, so I made it a little ...

This time, I write the URL in a txt file, just call it, pack it in a list, and write it to a file. It feels like you're just moving, so I think it's a lot of waste, but please close your eyes: frowning2:

If you create an apitest folder directly under C, put a txt file in it and execute it, you should get the execution result ...

txt file

apiTest.txt

//The one who calls the postal code of Hyogo prefecture
https://zip-cloud.appspot.com/api/search?zipcode=6580083
https://zip-cloud.appspot.com/api/search?zipcode=6580026
https://zip-cloud.appspot.com/api/search?zipcode=6580025
https://zip-cloud.appspot.com/api/search?zipcode=6580082
https://zip-cloud.appspot.com/api/search?zipcode=6580024

Source code

ApiTest.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

public class ApiTest {
	public static void main(String[] args) throws InterruptedException {
			//Path to the folder containing the API execution URL
			final String filePath = "C:\\apitest\\";

			//apiURL Files already prepared
			List<String> apiUrl = new ArrayList<>();

			//Stores API results.
			List<String> apiResult = new ArrayList<>();


			//File path for local
	 		File file = new File(filePath);

			try {
				if (file.isDirectory()) {
					String[] fileList = file.list();
					//Read all the files in the folder for the time being so that you can do various things in the future with the file name str
					for(String str:fileList) {
						try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath + str)))) {
							//A one-line string-> line
							String line;
							while ((line = reader.readLine()) != null) {
								apiUrl.add(line);
							}
						}
					}
				}
			}catch(Exception e) {
				e.printStackTrace();
			}
			for(int i=0;i < apiUrl.size();i++) {
				if(apiUrl.get(i) == null) {
				//When there is no execution URL
					apiResult.add("");
				}else {
					apiResult.add(callGet(apiUrl.get(i)));
				}
			}
			//Export the result to a text file
			try(FileWriter fileWrite = new FileWriter("C:\\apitest\\apiResult.txt");
					PrintWriter pw = new PrintWriter(new BufferedWriter(fileWrite));) {
					//Export to file
				for(int i=0 ;i<apiResult.size();i++) {
					pw.println(apiResult.get(i));
				}
			}catch(Exception e) {
				e.printStackTrace();
			}
		}



		public static String callGet(String strGetUrl){

			HttpURLConnection con = null;
			StringBuffer result = new StringBuffer();

			try {

				URL url = new URL(strGetUrl);

				con = (HttpURLConnection) url.openConnection();
				//Basic authentication pattern
				//con.setRequestProperty("Authorization", "Basic " + Base64.getEncoder().encodeToString("userName:pass".getBytes()));

				con.setRequestMethod("GET");
				con.connect();

				//HTTP response code
				final int status = con.getResponseCode();
				if (status == HttpURLConnection.HTTP_OK) {
					//Successful communication
					//Get the text
					final InputStream in = con.getInputStream();
					String encoding = con.getContentEncoding();
					if(null == encoding){
						encoding = "UTF-8";
					}
					final InputStreamReader inReader = new InputStreamReader(in, encoding);
					final BufferedReader bufReader = new BufferedReader(inReader);
					String line = null;
					//Read text line by line
					while((line = bufReader.readLine()) != null) {
						result.append(line);
					}
					bufReader.close();
					inReader.close();
					in.close();
				}else{
					System.out.println(status);
				}

			}catch (Exception e1) {
				e1.printStackTrace();
			} finally {
				if (con != null) {
					//Disconnect
					con.disconnect();
				}
			}
			System.out.println("result=" + result.toString());

			return result.toString();
		}

	}

Finally

In some cases, there is basic authentication, so I also described the pattern. If you get a 401 error, you usually have Basic authentication, so if you write the Basic authentication part, I feel like you can do something about it.

That's it: relaxed:

reference

http://www.programing-style.com/android/android-api/android-httpurlconnection-get-text/