chore: add base64 image chat completion sample (#40)

samples/src/main/ai.z.openapi.samples/ChatCompletionBase64Example.java

@@ -0,0 +1,66 @@
+package ai.z.openapi.samples;
+
+import ai.z.openapi.ZhipuAiClient;
+import ai.z.openapi.service.model.ChatCompletionCreateParams;
+import ai.z.openapi.service.model.ChatCompletionResponse;
+import ai.z.openapi.service.model.ChatMessage;
+import ai.z.openapi.service.model.ChatMessageRole;
+import ai.z.openapi.service.model.ChatThinking;
+import ai.z.openapi.service.model.ImageUrl;
+import ai.z.openapi.service.model.MessageContent;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.util.Arrays;
+import java.util.Base64;
+
+/**
+ * Streaming Chat Example
+ * Demonstrates how to use ZaiClient for streaming chat conversations
+ */
+public class ChatCompletionBase64Example {
+    
+    public static void main(String[] args) throws IOException {
+        // Create client
+        // for Z.ai use the `ZaiClient`, for Zhipu AI use the ZhipuAiClient
+        ZhipuAiClient client = ZhipuAiClient.builder().build();
+
+        String file = ClassLoader.getSystemResource("grounding.png").getFile();
+        byte[] bytes = Files.readAllBytes(new File(file).toPath());
+        Base64.Encoder encoder = Base64.getEncoder();
+        String base64 = encoder.encodeToString(bytes);
+
+        // Create chat request
+        ChatCompletionCreateParams streamRequest = ChatCompletionCreateParams.builder()
+            .model("glm-4.5v")
+            .messages(Arrays.asList(
+                ChatMessage.builder()
+                    .role(ChatMessageRole.USER.value())
+                    .content(Arrays.asList(
+                        MessageContent.builder()
+                            .type("image_url")
+                            .imageUrl(ImageUrl.builder()
+                                .url(base64)
+                                .build())
+                            .build(),
+                        MessageContent.builder()
+                            .type("text")
+                            .text("What are the pic talk about?")
+                            .build()
+                    ))
+                    .build()
+            ))
+            .thinking(ChatThinking.builder().type("enabled").build())
+            .build();
+
+        ChatCompletionResponse response = client.chat().createChatCompletion(streamRequest);
+
+        if (response.isSuccess()) {
+            Object content = response.getData().getChoices().get(0).getMessage();
+            System.out.println("Response: " + content);
+        } else {
+            System.err.println("Error: " + response.getMsg());
+        }
+    }
+}