feat：会话接口和实现

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

+package cn.bugstack.chatglm.session;
+
+import cn.bugstack.chatglm.model.ChatCompletionRequest;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import okhttp3.sse.EventSource;
+import okhttp3.sse.EventSourceListener;
+
+/**
+ * @author 小傅哥，微信：fustack
+ * @description 会话服务接口
+ * @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 OpenAiSession {
+
+    EventSource completions(ChatCompletionRequest chatCompletionRequest, EventSourceListener eventSourceListener) throws JsonProcessingException;
+
+}

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

+package cn.bugstack.chatglm.session.defaults;
+
+import cn.bugstack.chatglm.IOpenAiApi;
+import cn.bugstack.chatglm.model.ChatCompletionRequest;
+import cn.bugstack.chatglm.session.Configuration;
+import cn.bugstack.chatglm.session.OpenAiSession;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import okhttp3.MediaType;
+import okhttp3.Request;
+import okhttp3.RequestBody;
+import okhttp3.sse.EventSource;
+import okhttp3.sse.EventSourceListener;
+
+/**
+ * @author 小傅哥，微信：fustack
+ * @description 会话服务
+ * @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 DefaultOpenAiSession implements OpenAiSession {
+
+    /**
+     * OpenAi 接口
+     */
+    private final Configuration configuration;
+    /**
+     * 工厂事件
+     */
+    private final EventSource.Factory factory;
+
+    private IOpenAiApi openAiApi;
+
+    public DefaultOpenAiSession(Configuration configuration) {
+        this.configuration = configuration;
+        this.openAiApi = configuration.getOpenAiApi();
+        this.factory = configuration.createRequestFactory();
+    }
+
+    @Override
+    public EventSource completions(ChatCompletionRequest chatCompletionRequest, EventSourceListener eventSourceListener) throws JsonProcessingException {
+        // 构建请求信息
+        Request request = new Request.Builder()
+                .url(configuration.getApiHost().concat(IOpenAiApi.v3_completions).replace("{model}", chatCompletionRequest.getModel().getCode()))
+                .post(RequestBody.create(MediaType.parse("application/json"), chatCompletionRequest.toString()))
+                .build();
+
+        // 返回事件结果
+        return factory.newEventSource(request, eventSourceListener);
+    }
+
+}