Javaで郵便番号から住所を取得！初心者でもわかる7選の方法

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class AddressFetcher {
    public static void main(String[] args) {
        try {
            URL url = new URL("http://api.zipaddress.net/?zipcode=1000001");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            int responseCode = conn.getResponseCode();

            if (responseCode == 200) {
                BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                String inputLine;
                StringBuffer response = new StringBuffer();
                
                while ((inputLine = in.readLine()) != null) {
                    response.append(inputLine);
                }
                in.close();

                System.out.println("住所: " + response.toString());
            } else {
                System.out.println("エラー発生: " + responseCode);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import jp.xxxxx.PostalCodeResolver;

public class AddressFetcher {
    public static void main(String[] args) {
        PostalCodeResolver resolver = new PostalCodeResolver();
        String address = resolver.getAddress("100-0001");
        System.out.println("取得した住所: " + address);
    }
}

import java.io.IOException;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

public class AddressRetriever {
    public static void main(String[] args) {
        try {
            String postalCode = "1000001";
            Document doc = Jsoup.connect("https://www.post.japanpost.jp/cgi-zip/zipcode.php?zip=" + postalCode).get();
            String address = doc.select(".zipcode_result_address").text();
            if(address.isEmpty()) {
                throw new Exception("住所が見つかりませんでした。");
            }
            System.out.println("取得した住所: " + address);
        } catch(IOException e) {
            System.err.println("データの取得中にエラーが発生しました: " + e.getMessage());
        } catch(Exception e) {
            System.err.println("エラーが発生しました: " + e.getMessage());
        }
    }
}

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import org.jsoup.Jsoup;

public class BulkAddressRetrieval {
    public static void main(String[] args) {
        Map<String, String> postalCodes = new HashMap<>();
        postalCodes.put("100-0005", "");
        postalCodes.put("150-0001", "");

        postalCodes.keySet().forEach(postalCode -> {
            try {
                String url = "https://api.zipaddress.net/?zipcode=" + postalCode;
                String json = Jsoup.connect(url).ignoreContentType(true).execute().body();
                postalCodes.put(postalCode, json);
            } catch (IOException e) {
                e.printStackTrace();
            }
        });

        postalCodes.forEach((key, value) -> {
            System.out.println("郵便番号: " + key + ", 住所: " + value);
        });
    }
}

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class AddressApp {
    public static void main(String[] args) {
        JFrame frame = new JFrame("郵便番号から住所を取得");
        frame.setSize(300, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        frame.add(panel);
        placeComponents(panel);

        frame.setVisible(true);
    }

    private static void placeComponents(JPanel panel) {
        panel.setLayout(null);

        JLabel userLabel = new JLabel("郵便番号");
        userLabel.setBounds(10, 20, 80, 25);
        panel.add(userLabel);

        JTextField userText = new JTextField(20);
        userText.setBounds(100, 20, 165, 25);
        panel.add(userText);

        JButton loginButton = new JButton("住所取得");
        loginButton.setBounds(10, 80, 80, 25);
        panel.add(loginButton);

        loginButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                // ここに住所取得のコードを実装
            }
        });
    }
}

loginButton.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        String postalCode = userText.getText();
        try {
            URL url = new URL("http://zipcoda.net/api?zipcode=" + postalCode);
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            con.setRequestMethod("GET");

            BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
            String inputLine;
            StringBuffer content = new StringBuffer();
            while ((inputLine = in.readLine()) != null) {
                content.append(inputLine);
            }
            in.close();

            con.disconnect();

            JSONObject jsonResponse = new JSONObject(content.toString());
            String address = jsonResponse.getString("address");

            JOptionPane.showMessageDialog(frame, "住所: " + address);

        } catch (Exception ex) {
            JOptionPane.showMessageDialog(frame, "エラーが発生しました: " + ex.getMessage());
        }
    }
});

public class PostalCodeValidator {
    public static boolean isValid(String postalCode) {
        return postalCode != null && postalCode.matches("\d{7}");
    }
}

public class Main {
    public static void main(String[] args) {
        String postalCode = "1234567";
        if (PostalCodeValidator.isValid(postalCode)) {
            System.out.println("郵便番号が正しいです");
        } else {
            System.out.println("郵便番号が正しくありません");
        }
    }
}

public class APIRequestHandler {
    private static final int REQUEST_LIMIT = 100;
    private static final long TIME_WINDOW = 3600000;
    private static int requestCount = 0;
    private static long startTime = System.currentTimeMillis();

    public static boolean isAllowedToRequest() {
        long currentTime = System.currentTimeMillis();
        if (currentTime - startTime > TIME_WINDOW) {
            startTime = currentTime;
            requestCount = 0;
        }
        if (requestCount < REQUEST_LIMIT) {
            requestCount++;
            return true;
        } else {
            return false;
        }
    }
}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class AddressDatabase {

    private static final String URL = "jdbc:mysql://localhost:3306/your_database";
    private static final String USER = "your_username";
    private static final String PASSWORD = "your_password";

    public static void main(String[] args) {
        try {
            Connection connection = DriverManager.getConnection(URL, USER, PASSWORD);
            String sql = "INSERT INTO address (postcode, address) VALUES (?, ?)";
            PreparedStatement preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setString(1, "100-0001");
            preparedStatement.setString(2, "東京都千代田区千代田");
            preparedStatement.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import javax.swing.JOptionPane;

public class MapDisplay {
    public static void main(String[] args) {
        String address = JOptionPane.showInputDialog("住所を入力してください");
        try {
            URI uri = new URI("https://www.google.com/maps/search/?api=1&query=" + address);
            java.awt.Desktop.getDesktop().browse(uri);
        } catch (IOException | URISyntaxException e) {
            e.printStackTrace();
        }
    }
}

import java.net.HttpURLConnection;
import java.net.URL;
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class AddressFetcher {
    public static void main(String[] args) {
        String zipcode = "1000001";
        String apiUrl = "http://zipcloud.ibsnet.co.jp/api/search?zipcode=" + zipcode;

        try {
            URL url = new URL(apiUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));

            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }

            reader.close();
            connection.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

// org.jsonライブラリを利用すると言えるでしょう。
import org.json.JSONObject;

// ...中略...

String line;
StringBuilder result = new StringBuilder();
while ((line = reader.readLine()) != null) {
    result.append(line);
}

JSONObject json = new JSONObject(result.toString());
String address = json.getJSONArray("results").getJSONObject(0).getString("address1") + 
                 json.getJSONArray("results").getJSONObject(0).getString("address2") + 
                 json.getJSONArray("results").getJSONObject(0).getString("address3");
System.out.println("住所: " + address);

// ...中略...

<form action="AddressServlet" method="POST">
    <label for="zipcode">郵便番号:</label>
    <input type="text" id="zipcode" name="zipcode">
    <button type="submit">住所取得</button>
</form>

label {
    display: block;
    margin-bottom: 5px;
}

input[type="text"] {
    width: 200px;
    padding: 5px;
    margin-bottom: 10px;
}

button {
    padding: 5px 10px;
}