feat：会话工厂

src/main/java/cn/bugstack/chatglm/session/OpenAiSessionFactory.java

+package cn.bugstack.chatglm.session;
+
+/**
+ * @author 小傅哥，微信：fustack
+ * @description 工厂接口
+ * @github https://github.com/fuzhengwei
+ * @Copyright 公众号：bugstack虫洞栈 | 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
+ */
+public interface OpenAiSessionFactory {
+
+    OpenAiSession openSession();
+
+}

src/main/java/cn/bugstack/chatglm/session/defaults/DefaultOpenAiSessionFactory.java

+package cn.bugstack.chatglm.session.defaults;
+
+import cn.bugstack.chatglm.IOpenAiApi;
+import cn.bugstack.chatglm.interceptor.OpenAiHTTPInterceptor;
+import cn.bugstack.chatglm.session.Configuration;
+import cn.bugstack.chatglm.session.OpenAiSession;
+import cn.bugstack.chatglm.session.OpenAiSessionFactory;
+import okhttp3.OkHttpClient;
+import okhttp3.logging.HttpLoggingInterceptor;
+import retrofit2.Retrofit;
+import retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;
+import retrofit2.converter.jackson.JacksonConverterFactory;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * @author 小傅哥，微信：fustack
+ * @description 会话工厂
+ * @github https://github.com/fuzhengwei
+ * @Copyright 公众号：bugstack虫洞栈 | 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
+ */
+public class DefaultOpenAiSessionFactory implements OpenAiSessionFactory {
+
+    private final Configuration configuration;
+
+    public DefaultOpenAiSessionFactory(Configuration configuration) {
+        this.configuration = configuration;
+    }
+
+    @Override
+    public OpenAiSession openSession() {
+        // 1. 日志配置
+        HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();
+        httpLoggingInterceptor.setLevel(configuration.getLevel());
+
+        // 2. 开启 Http 客户端
+        OkHttpClient okHttpClient = new OkHttpClient
+                .Builder()
+                .addInterceptor(httpLoggingInterceptor)
+                .addInterceptor(new OpenAiHTTPInterceptor(configuration))
+                .connectTimeout(configuration.getConnectTimeout(), TimeUnit.SECONDS)
+                .writeTimeout(configuration.getWriteTimeout(), TimeUnit.SECONDS)
+                .readTimeout(configuration.getReadTimeout(), TimeUnit.SECONDS)
+                .build();
+
+        configuration.setOkHttpClient(okHttpClient);
+
+        // 3. 创建 API 服务
+        IOpenAiApi openAiApi = new Retrofit.Builder()
+                .baseUrl(configuration.getApiHost())
+                .client(okHttpClient)
+                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
+                .addConverterFactory(JacksonConverterFactory.create())
+                .build().create(IOpenAiApi.class);
+
+        configuration.setOpenAiApi(openAiApi);
+
+        return new DefaultOpenAiSession(configuration);
+    }
+
+}