prefs: engine 端增加系统启动默认页，增加友好提示。

Signed-off-by: feihu.wang <wfh45678@163.com>

radar-engine/src/main/java/com/pgmmers/radar/config/SwaggerConfig.java

@@ -21,7 +21,7 @@ public class SwaggerConfig {
                 .apiInfo(buildApiInf())
                 .select()
                 .apis(RequestHandlerSelectors.basePackage("com.pgmmers.radar.controller"))
-                .paths(PathSelectors.any())
+                .paths(PathSelectors.regex("/services/.*"))
                 .build();
     }
 

radar-engine/src/main/java/com/pgmmers/radar/controller/IndexController.java

@@ -0,0 +1,22 @@
+package com.pgmmers.radar.controller;
+
+import com.pgmmers.radar.service.common.CommonResult;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.servlet.http.HttpServletRequest;
+
+/**
+ * engine 启动首页.
+ * @author wangfeihu
+ */
+@RestController
+public class IndexController {
+
+    @GetMapping(value = {"/", ""})
+    public CommonResult index(HttpServletRequest request) {
+        CommonResult result =  new CommonResult(Boolean.TRUE, "100", "Engine is running");
+        result.getData().put("swagger url:", request.getRequestURL() + "swagger-ui.html");
+        return result;
+    }
+}

radar-service/src/main/java/com/pgmmers/radar/service/common/CommonResult.java

@@ -58,6 +58,17 @@ public class CommonResult implements Serializable{
         this.data = data;
     }
 
+
+    public CommonResult () {
+
+    }
+
+    public CommonResult(boolean success, String code, String msg) {
+        this.success = success;
+        this.code = code;
+        this.msg = msg;
+    }
+
     @Override
     public String toString() {
         return "CommonResult [success=" + success + ", msg=" + msg + ", code=" + code + "]";