修正comment，banner接口

src/main/java/com/lovenav/service/serviceImpl/BannersServiceImpl.java

@@ -0,0 +1,67 @@
+package com.lovenav.service.serviceImpl;
+
+import com.alibaba.fastjson.JSON;
+import com.lovenav.dao.BannersDao;
+import com.lovenav.entity.Banners;
+import com.lovenav.service.BannersService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import java.util.List;
+import java.util.HashMap;
+
+@Service
+public class BannersServiceImpl implements BannersService {
+    @Autowired
+    private BannersDao bannersDao;
+
+//  跳转链接
+    @Override
+    public String Jump_url(int id){
+        Banners banners = bannersDao.selectByPrimaryKey(id);
+        HashMap<String, Object> hashMap = new HashMap<>();
+        if(banners != null){
+            hashMap.put("url",banners.getUrl());
+        }else{
+            hashMap.put("code",500);
+            hashMap.put("msg","找不到指定链接");
+        }
+        return JSON.toJSONString(hashMap);
+    }
+
+//  添加banner
+    @Override
+    public String Add_banner(Banners banners) {
+        int result = bannersDao.insert(banners);
+        HashMap<String, Object> hashMap = new HashMap<>();
+        if(result>0){
+            return JSON.toJSONString(banners);
+        }else{
+            hashMap.put("code",500);
+            hashMap.put("msg","添加banner失败");
+            return JSON.toJSONString(hashMap);
+        }
+    }
+
+//    删除banner
+    @Override
+    public String Delete_banner(int id){
+        int result = bannersDao.deleteByPrimaryKey(id);
+        HashMap<String, Object> hashMap = new HashMap<>();
+        if(result>0){
+            hashMap.put("code",200);
+            hashMap.put("msg","删除成功");
+            return JSON.toJSONString(hashMap);
+        }else{
+            hashMap.put("code",500);
+            hashMap.put("msg","删除失败");
+            return JSON.toJSONString(hashMap);
+        }
+    }
+
+//    展示banner
+    @Override
+    public String View_banner(){
+        List<Banners> list = bannersDao.selectByAllBanners();
+        return JSON.toJSONString(list);
+    }
+}