2024.11.12

import okhttp3.*;
import org.json.JSONObject;

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

public class TranslatorGUI {

    public static final String API_KEY = "4M5FTgQ0RtALmrZVaezSyvbO";
    public static final String SECRET_KEY = "GZMweUiQxzBifIO4QvadUgjNJqYMkONU";
    static final OkHttpClient HTTP_CLIENT = new OkHttpClient().newBuilder().build();

    public static void main(String[] args) {
        // 创建并显示GUI
        SwingUtilities.invokeLater(() -> new TranslatorGUI().createAndShowGUI());
    }

    // 创建图形界面
    public void createAndShowGUI() {
        // JFrame
        JFrame frame = new JFrame("百度翻译工具");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 300);
        frame.setLocationRelativeTo(null);  // 窗口居中显示

        // 主面板
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(5, 1));

        // 选择翻译方向
        JPanel directionPanel = new JPanel();
        JLabel directionLabel = new JLabel("请选择翻译方向:");
        JRadioButton zhToEnButton = new JRadioButton("中文 -> 英文");
        JRadioButton enToZhButton = new JRadioButton("英文 -> 中文");
        ButtonGroup group = new ButtonGroup();
        group.add(zhToEnButton);
        group.add(enToZhButton);
        directionPanel.add(directionLabel);
        directionPanel.add(zhToEnButton);
        directionPanel.add(enToZhButton);

        // 输入框和按钮
        JPanel inputPanel = new JPanel();
        JTextField inputField = new JTextField(25);
        JButton translateButton = new JButton("翻译");

        // 显示翻译结果
        JPanel outputPanel = new JPanel();
        JTextArea outputArea = new JTextArea(5, 30);
        outputArea.setEditable(false);

        // 事件处理
        translateButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String text = inputField.getText();
                if (text.isEmpty()) {
                    JOptionPane.showMessageDialog(frame, "请输入要翻译的文本！", "错误", JOptionPane.ERROR_MESSAGE);
                    return;
                }

                // 选择翻译方向
                String from = "";
                String to = "";

                if (zhToEnButton.isSelected()) {
                    from = "zh";
                    to = "en";
                } else if (enToZhButton.isSelected()) {
                    from = "en";
                    to = "zh";
                } else {
                    JOptionPane.showMessageDialog(frame, "请选择翻译方向！", "错误", JOptionPane.ERROR_MESSAGE);
                    return;
                }

                // 调用翻译API并更新结果
                try {
                    String translation = translate(text, from, to);
                    outputArea.setText(translation);
                } catch (IOException ex) {
                    ex.printStackTrace();
                    JOptionPane.showMessageDialog(frame, "翻译失败，请稍后重试！", "错误", JOptionPane.ERROR_MESSAGE);
                }
            }
        });

        // 组件布局
        panel.add(directionPanel);
        panel.add(inputPanel);
        inputPanel.add(inputField);
        inputPanel.add(translateButton);
        panel.add(outputPanel);
        outputPanel.add(new JScrollPane(outputArea));

        frame.add(panel);
        frame.setVisible(true);
    }

    /**
     * 从用户的AK，SK生成鉴权签名（Access Token）
     *
     * @return 鉴权签名（Access Token）
     * @throws IOException IO异常
     */
    static String getAccessToken() throws IOException {
        MediaType mediaType = MediaType.parse("application/x-www-form-urlencoded");
        RequestBody body = RequestBody.create(mediaType, "grant_type=client_credentials&client_id=" + API_KEY
                + "&client_secret=" + SECRET_KEY);
        Request request = new Request.Builder()
                .url("https://aip.baidubce.com/oauth/2.0/token")
                .method("POST", body)
                .addHeader("Content-Type", "application/x-www-form-urlencoded")
                .build();
        Response response = HTTP_CLIENT.newCall(request).execute();
        return new JSONObject(response.body().string()).getString("access_token");
    }

    /**
     * 使用百度翻译API进行翻译
     *
     * @param text   要翻译的文本
     * @param from   源语言，例如 "zh" 表示中文，"en" 表示英文
     * @param to     目标语言，例如 "zh" 表示中文，"en" 表示英文
     * @return 翻译后的文本
     * @throws IOException IO异常
     */
    static String translate(String text, String from, String to) throws IOException {
        MediaType mediaType = MediaType.parse("application/json");
        String jsonRequest = String.format("{\"from\":\"%s\",\"to\":\"%s\",\"q\":\"%s\"}", from, to, text);
        RequestBody body = RequestBody.create(mediaType, jsonRequest);
        Request request = new Request.Builder()
                .url("https://aip.baidubce.com/rpc/2.0/mt/texttrans/v1?access_token=" + getAccessToken())
                .method("POST", body)
                .addHeader("Content-Type", "application/json")
                .addHeader("Accept", "application/json")
                .build();
        Response response = HTTP_CLIENT.newCall(request).execute();
        String responseBody = response.body().string();

        // 打印返回的响应内容，帮助调试
        System.out.println("API Response: " + responseBody);

        // 解析API返回的JSON结果，获取翻译后的文本
        JSONObject jsonResponse = new JSONObject(responseBody);

        // 获取 "result" 对象
        JSONObject result = jsonResponse.getJSONObject("result");

        // 获取 "trans_result" 数组
        if (result.has("trans_result")) {
            return result.getJSONArray("trans_result")
                    .getJSONObject(0)
                    .getString("dst");  // 获取翻译后的文本
        } else {
            // 如果没有 "trans_result"，打印错误信息
            System.out.println("Error: " + jsonResponse.toString());
            return "翻译失败";
        }
    }
}