diff --git a/src/main/java/com/aiassistant/controller/ChatController.java b/src/main/java/com/aiassistant/controller/ChatController.java
new file mode 100644
index 0000000..d7a45af
--- /dev/null
+++ b/src/main/java/com/aiassistant/controller/ChatController.java
@@ -0,0 +1,27 @@
+package com.aiassistant.controller;
+
+import com.aiassistant.model.Message;
+import com.aiassistant.service.ChatService;
+import com.aiassistant.utils.ResultModel;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.multipart.MultipartFile;
+
+@RestController
+public class ChatController {
+    private final ChatService chatService;
+
+    @Autowired
+    public ChatController(ChatService chatService) {
+        this.chatService = chatService;
+    }
+
+    @PostMapping("/sendMessage")
+    public ResultModel<Message> sendMessage(@RequestParam String content,
+                                            @RequestParam(required = false) MultipartFile image,
+                                            @RequestParam(required = false) MultipartFile video) {
+        return chatService.sendMessage(content, image, video);
+    }
+}
diff --git a/src/main/java/com/aiassistant/controller/RecommendationController.java b/src/main/java/com/aiassistant/controller/RecommendationController.java
new file mode 100644
index 0000000..a48d646
--- /dev/null
+++ b/src/main/java/com/aiassistant/controller/RecommendationController.java
@@ -0,0 +1,26 @@
+package com.aiassistant.controller;
+
+import com.aiassistant.model.Recommendation;
+import com.aiassistant.model.TravelPlan;
+import com.aiassistant.service.RecommendationService;
+import com.aiassistant.utils.ResultModel;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class RecommendationController {
+    private RecommendationService recommendationService;
+
+    @Autowired
+    public RecommendationController(RecommendationService recommendationService) {
+        this.recommendationService = recommendationService;
+    }
+
+    @PostMapping("/recommendation")
+    public ResultModel<Recommendation> getRecommendation(@RequestBody TravelPlan travelPlan) {
+        Recommendation recommendation = recommendationService.getRecommendation(travelPlan);
+        return ResultModel.ofSuccess(recommendation);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/aiassistant/controller/ThirdPartyController.java b/src/main/java/com/aiassistant/controller/ThirdPartyController.java
new file mode 100644
index 0000000..b1dea45
--- /dev/null
+++ b/src/main/java/com/aiassistant/controller/ThirdPartyController.java
@@ -0,0 +1,26 @@
+package com.aiassistant.controller;
+
+import com.aiassistant.service.ThirdPartyService;
+import com.aiassistant.utils.ResultModel;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/third-party")
+public class ThirdPartyController {
+
+    private final ThirdPartyService thirdPartyService;
+
+    @Autowired
+    public ThirdPartyController(ThirdPartyService thirdPartyService) {
+        this.thirdPartyService = thirdPartyService;
+    }
+
+    @PostMapping("/access")
+    public ResultModel<String> accessThirdParty(@RequestParam String platform, @RequestParam String userId, @RequestParam String orderInfo) {
+        return thirdPartyService.accessThirdParty(platform, userId, orderInfo);
+    }
+}
diff --git a/src/main/java/com/aiassistant/controller/TravelPlanController.java b/src/main/java/com/aiassistant/controller/TravelPlanController.java
new file mode 100644
index 0000000..e40bddd
--- /dev/null
+++ b/src/main/java/com/aiassistant/controller/TravelPlanController.java
@@ -0,0 +1,30 @@
+package com.aiassistant.controller;
+
+import com.aiassistant.model.TravelPlan;
+import com.aiassistant.service.TravelPlanService;
+import com.aiassistant.utils.ResultModel;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Date;
+
+@RestController
+public class TravelPlanController {
+    private final TravelPlanService travelPlanService;
+
+    @Autowired
+    public TravelPlanController(TravelPlanService travelPlanService) {
+        this.travelPlanService = travelPlanService;
+    }
+
+    @PostMapping("/travel-plan")
+    public ResultModel<TravelPlan> publishTravelPlan(@RequestParam String title,
+                                                     @RequestParam String description,
+                                                     @RequestParam Date startTime,
+                                                     @RequestParam Date endTime,
+                                                     @RequestParam Integer limit) {
+        return travelPlanService.publishTravelPlan(title, description, startTime, endTime, limit);
+    }
+}
diff --git a/src/main/java/com/aiassistant/mapper/MessageMapper.java b/src/main/java/com/aiassistant/mapper/MessageMapper.java
new file mode 100644
index 0000000..429932d
--- /dev/null
+++ b/src/main/java/com/aiassistant/mapper/MessageMapper.java
@@ -0,0 +1,15 @@
+package com.aiassistant.mapper;
+
+import com.aiassistant.model.Message;
+import org.apache.ibatis.annotations.Insert;
+import org.apache.ibatis.annotations.Options;
+import org.apache.ibatis.annotations.SelectKey;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface MessageMapper {
+    @Insert("INSERT INTO message(content) VALUES(#{content})")
+    @Options(useGeneratedKeys = true, keyProperty = "id")
+    @SelectKey(statement = "SELECT LAST_INSERT_ID()", keyProperty = "id", before = false, resultType = int.class)
+    int insertMessage(Message message);
+}
diff --git a/src/main/java/com/aiassistant/mapper/TravelPlanMapper.java b/src/main/java/com/aiassistant/mapper/TravelPlanMapper.java
new file mode 100644
index 0000000..fbdd575
--- /dev/null
+++ b/src/main/java/com/aiassistant/mapper/TravelPlanMapper.java
@@ -0,0 +1,16 @@
+package com.aiassistant.mapper;
+
+import com.aiassistant.model.TravelPlan;
+import org.apache.ibatis.annotations.Insert;
+import org.apache.ibatis.annotations.Options;
+import org.apache.ibatis.annotations.SelectKey;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface TravelPlanMapper {
+    @Insert("INSERT INTO travel_plan(user_id, start_time, end_time, destination, remark) " +
+            "VALUES(#{userId}, #{startTime}, #{endTime}, #{destination}, #{remark})")
+    @Options(useGeneratedKeys = true, keyProperty = "id")
+    @SelectKey(statement = "SELECT LAST_INSERT_ID()", keyProperty = "id", before = false, resultType = int.class)
+    int insertTravelPlan(TravelPlan travelPlan);
+}
diff --git a/src/main/java/com/aiassistant/service/ChatService.java b/src/main/java/com/aiassistant/service/ChatService.java
new file mode 100644
index 0000000..608e086
--- /dev/null
+++ b/src/main/java/com/aiassistant/service/ChatService.java
@@ -0,0 +1,30 @@
+package com.aiassistant.service;
+
+import com.aiassistant.mapper.MessageMapper;
+import com.aiassistant.model.Message;
+import com.aiassistant.utils.ResultModel;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.multipart.MultipartFile;
+
+@Service
+public class ChatService {
+    private final MessageMapper messageMapper;
+
+    @Autowired
+    public ChatService(MessageMapper messageMapper) {
+        this.messageMapper = messageMapper;
+    }
+
+    public ResultModel<Message> sendMessage(String content, MultipartFile image, MultipartFile video) {
+        // Save the message to the database
+        Message message = new Message();
+        message.setContent(content);
+        message.setImage(image != null ? image.getOriginalFilename() : null);
+        message.setVideo(video != null ? video.getOriginalFilename() : null);
+        messageMapper.insertMessage(message);
+
+        // Return the message object
+        return ResultModel.ofSuccess(message);
+    }
+}
diff --git a/src/main/java/com/aiassistant/service/RecommendationService.java b/src/main/java/com/aiassistant/service/RecommendationService.java
new file mode 100644
index 0000000..b3150da
--- /dev/null
+++ b/src/main/java/com/aiassistant/service/RecommendationService.java
@@ -0,0 +1,9 @@
+package com.aiassistant.service;
+
+import com.aiassistant.model.Recommendation;
+import com.aiassistant.model.TravelPlan;
+import com.aiassistant.utils.ResultModel;
+
+public interface RecommendationService {
+    ResultModel<Recommendation> getRecommendation(TravelPlan travelPlan);
+}
diff --git a/src/main/java/com/aiassistant/service/ThirdPartyService.java b/src/main/java/com/aiassistant/service/ThirdPartyService.java
new file mode 100644
index 0000000..ed51c5b
--- /dev/null
+++ b/src/main/java/com/aiassistant/service/ThirdPartyService.java
@@ -0,0 +1,7 @@
+package com.aiassistant.service;
+
+import com.aiassistant.utils.ResultModel;
+
+public interface ThirdPartyService {
+    ResultModel<String> accessThirdParty(String platform, String userId, String orderInfo);
+}
\ No newline at end of file
diff --git a/src/main/java/com/aiassistant/service/TravelPlanService.java b/src/main/java/com/aiassistant/service/TravelPlanService.java
new file mode 100644
index 0000000..43d6624
--- /dev/null
+++ b/src/main/java/com/aiassistant/service/TravelPlanService.java
@@ -0,0 +1,32 @@
+package com.aiassistant.service;
+
+import com.aiassistant.mapper.TravelPlanMapper;
+import com.aiassistant.model.TravelPlan;
+import com.aiassistant.utils.ResultModel;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.Date;
+
+@Service
+public class TravelPlanService {
+    private final TravelPlanMapper travelPlanMapper;
+
+    @Autowired
+    public TravelPlanService(TravelPlanMapper travelPlanMapper) {
+        this.travelPlanMapper = travelPlanMapper;
+    }
+
+    public ResultModel<TravelPlan> publishTravelPlan(String title, String description, Date startTime, Date endTime, Integer limit) {
+        TravelPlan travelPlan = new TravelPlan();
+        travelPlan.setTitle(title);
+        travelPlan.setDescription(description);
+        travelPlan.setStartTime(startTime);
+        travelPlan.setEndTime(endTime);
+        travelPlan.setLimit(limit);
+
+        travelPlanMapper.insertTravelPlan(travelPlan);
+
+        return ResultModel.ofSuccess(travelPlan);
+    }
+}