diff --git a/car-base-common/src/main/java/com/god/base/domain/Car.java b/car-base-common/src/main/java/com/god/base/domain/Car.java
index fe97a7c..7faa554 100644
--- a/car-base-common/src/main/java/com/god/base/domain/Car.java
+++ b/car-base-common/src/main/java/com/god/base/domain/Car.java
@@ -133,6 +133,11 @@ public class Car  {
      */
     private String carTypeName;
 
+    /**
+     * 车辆绑定的主题
+     */
+    private String topic;
+
     public static Car carBuildAdd(CarRequest carRequest){
         return Car.builder()
                 .carVinId(carRequest.getCarVinId())
diff --git a/car-base-common/src/main/java/com/god/base/domain/request/GetTopicReq.java b/car-base-common/src/main/java/com/god/base/domain/request/GetTopicReq.java
new file mode 100644
index 0000000..b47cd5f
--- /dev/null
+++ b/car-base-common/src/main/java/com/god/base/domain/request/GetTopicReq.java
@@ -0,0 +1,31 @@
+package com.god.base.domain.request;
+
+import lombok.Data;
+
+/**
+ * @description: 根据终端4个参数返回对应车辆主题
+ * @Author fst
+ * @date 2023/11/28 23:02
+ */
+@Data
+public class GetTopicReq {
+    /**
+     * 车辆VIN
+     */
+    private String carVin;
+
+    /**
+     * 时间戳
+     */
+    private String timeString;
+
+    /**
+     * 用户名
+     */
+    private String userName;
+
+    /**
+     * 随机字符串
+     */
+    private String randomStr;
+}
diff --git a/car-base-server/src/main/java/com/god/base/server/controller/TopLineController.java b/car-base-server/src/main/java/com/god/base/server/controller/TopLineController.java
new file mode 100644
index 0000000..8b68f42
--- /dev/null
+++ b/car-base-server/src/main/java/com/god/base/server/controller/TopLineController.java
@@ -0,0 +1,39 @@
+package com.god.base.server.controller;
+
+import com.god.base.domain.request.GetTopicReq;
+import com.god.base.server.service.TopLineService;
+import com.god.base.server.service.impl.TopLineServiceImpl;
+import com.god.common.core.domain.Result;
+import com.god.common.log.annotation.Log;
+import org.springframework.beans.factory.annotation.Autowired;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+
+
+/**
+ * @description: 车辆上线控制层
+ * @Author fst
+ * @date 2023/11/28 23:38
+ */
+@Controller
+@RequestMapping("/topLine")
+public class TopLineController {
+
+    @Autowired
+    private TopLineServiceImpl topLineService;
+
+    /**
+     * 获取主题
+     * @return
+     */
+    @GetMapping("getTopic")
+    @Log(title = "获取主题")
+    public Result<String> getTopic(@RequestBody GetTopicReq getTopicReq){
+        String topic = topLineService.getTopic(getTopicReq);
+        return Result.success(topic);
+    }
+}
diff --git a/car-base-server/src/main/java/com/god/base/server/service/TopLineService.java b/car-base-server/src/main/java/com/god/base/server/service/TopLineService.java
new file mode 100644
index 0000000..1dbe44f
--- /dev/null
+++ b/car-base-server/src/main/java/com/god/base/server/service/TopLineService.java
@@ -0,0 +1,21 @@
+package com.god.base.server.service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import com.god.base.domain.Car;
+import com.god.base.domain.request.GetTopicReq;
+
+/**
+ * 车辆上线
+ * @Author fst
+ * @date 2023/11/28 23:41
+ */
+public interface TopLineService extends IService<Car> {
+
+
+    /**
+     * 车辆上线，同时返回主题
+     * @param getTopicReq
+     * @return
+     */
+    String getTopic(GetTopicReq getTopicReq);
+}
diff --git a/car-base-server/src/main/java/com/god/base/server/service/impl/TopLineServiceImpl.java b/car-base-server/src/main/java/com/god/base/server/service/impl/TopLineServiceImpl.java
new file mode 100644
index 0000000..b369175
--- /dev/null
+++ b/car-base-server/src/main/java/com/god/base/server/service/impl/TopLineServiceImpl.java
@@ -0,0 +1,56 @@
+package com.god.base.server.service.impl;
+
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.god.base.domain.Car;
+import com.god.base.domain.request.GetTopicReq;
+import com.god.base.server.mapper.CarMapper;
+import com.god.base.server.service.TopLineService;
+import com.god.common.core.exception.ServiceException;
+import com.god.common.core.utils.StringUtils;
+import lombok.extern.log4j.Log4j2;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+/**
+ * @description: 车辆上线实现
+ * @Author fst
+ * @date 2023/11/28 23:42
+ */
+@Service
+@Log4j2
+public class TopLineServiceImpl extends ServiceImpl<CarMapper, Car>  implements TopLineService {
+
+    @Autowired
+    private CarMapper carMapper;
+
+    /**
+     * 车辆上线，同时返回主题
+     * @param getTopicReq
+     * @return
+     */
+    @Override
+    public String getTopic(GetTopicReq getTopicReq) {
+        try {
+            if (StringUtils.isEmpty(getTopicReq.getCarVin())){
+                throw  new ServiceException("车辆vin不能为空");
+            }
+            //根据车辆vinId查询车辆信息
+            QueryWrapper<Car> wrapper = new QueryWrapper<>();
+            wrapper.eq("carVinId",getTopicReq.getCarVin());
+            Car car = (Car) carMapper.selectObjs(wrapper);
+            if (StringUtils.isEmpty(new Car[]{car})){
+                throw new ServiceException("车辆信息不存在");
+            }
+            //把车辆状态修改为上线 1
+            car.setStatus(1);
+            carMapper.update(car,new QueryWrapper<Car>().eq("carVinId",getTopicReq.getCarVin()));
+            return car.getTopic();
+        }catch (Exception e){
+            log.info(e.getMessage());
+            return "god";
+        }
+    }
+}
diff --git a/car-base-server/src/main/java/com/god/base/server/util/Md5Util.java b/car-base-server/src/main/java/com/god/base/server/util/Md5Util.java
new file mode 100644
index 0000000..6d14562
--- /dev/null
+++ b/car-base-server/src/main/java/com/god/base/server/util/Md5Util.java
@@ -0,0 +1,31 @@
+package com.god.base.server.util;
+
+import com.god.base.domain.request.GetTopicReq;
+import lombok.extern.log4j.Log4j2;
+
+/**
+ * @description: md5加密工具类
+ * @Author fst
+ * @date 2023/11/29 14:16
+ */
+@Log4j2
+public class Md5Util {
+
+    public static String  md5(GetTopicReq getTopicReq) {
+        try {
+            java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
+            String str = getTopicReq.getTimeString() + getTopicReq.getUserName() + getTopicReq.getRandomStr() + getTopicReq.getCarVin();
+            byte[] array = md.digest(str.getBytes());
+            StringBuffer sb = new StringBuffer();
+            for (int i = 0; i < array.length; ++i) {
+                sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1, 3));
+            }
+            return sb.toString();
+        }
+        catch (java.security.NoSuchAlgorithmException e) {
+            log.error("MD5加密出现异常", e);
+            e.printStackTrace();
+        }
+        return null;
+    }
+}