微信小程序获取scheme码java示例代码

以下是一个简单的 Java 代码示例，用于在微信小程序中获取 scheme 码：

import java.util.HashMap;
import java.util.Map;

import com.alibaba.fastjson.JSON;

import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class WeChatMiniProgram {

    private static final String APP_ID = "你的小程序AppID";
    private static final String APP_SECRET = "你的小程序AppSecret";

    private static final String API_BASE_URL = "https://api.weixin.qq.com";

    /**
     * 获取微信小程序的 accessToken
     *
     * @return accessToken
     * @throws Exception
     */
    public String getAccessToken() throws Exception {
        OkHttpClient client = new OkHttpClient().newBuilder().build();
        String url = API_BASE_URL + "/cgi-bin/token?grant_type=client_credential&appid=" + APP_ID + "&secret=" + APP_SECRET;
        Request request = new Request.Builder().url(url).method("GET", null).build();
        Response response = client.newCall(request).execute();
        String responseBody = response.body().string();
        Map<String, Object> resultMap = JSON.parseObject(responseBody, HashMap.class);
        return (String) resultMap.get("access_token");
    }

    /**
     * 获取微信小程序的 scheme 码
     *
     * @param accessToken
     * @param pagePath
     * @return scheme
     * @throws Exception
     */
    public String getScheme(String accessToken, String pagePath) throws Exception {
        OkHttpClient client = new OkHttpClient().newBuilder().build();
        String url = API_BASE_URL + "/wxa/generatescheme?access_token=" + accessToken;
        MediaType mediaType = MediaType.parse("application/json");
        Map<String, Object> requestBody = new HashMap<>();
        requestBody.put("is_expire", false);
        requestBody.put("jump_wxa", new HashMap<String, Object>() {{
            put("path", pagePath);
            put("query", "");
        }});
        RequestBody body = RequestBody.create(mediaType, JSON.toJSONString(requestBody));
        Request request = new Request.Builder().url(url).method("POST", body).build();
        Response response = client.newCall(request).execute();
        String responseBody = response.body().string();
        Map<String, Object> resultMap = JSON.parseObject(responseBody, HashMap.class);
        return (String) resultMap.get("scheme");
    }

    public static void main(String[] args) throws Exception {
        WeChatMiniProgram weChatMiniProgram = new WeChatMiniProgram();
        String accessToken = weChatMiniProgram.getAccessToken();
        String pagePath = "pages/index/index"; // 小程序页面路径
        String scheme = weChatMiniProgram.getScheme(accessToken, pagePath);
        System.out.println("scheme: " + scheme);
    }

}

其中，`getAccessToken()` 方法用于获取小程序的 access_token，`getScheme()` 方法用于获取小程序的 scheme 码。在 `main()` 方法中，你可以使用 `getScheme()` 方法获取指定页面的 scheme 码，然后在你的小程序中使用该 scheme 码。