feat: add nacos discovery call

Author: EndlessSeeker

mse-heterogeneous-demo/SpringCloudA/src/main/java/com/alibabacloud/mse/demo/a/AApplication.java

@@ -28,6 +28,12 @@ RestTemplate restTemplate() {
         return new RestTemplate();
     }
 
+    @Bean
+    @LoadBalanced
+    RestTemplate loadBalancedRestTemplate() {
+        return new RestTemplate();
+    }
+
     @Bean(name = "serviceTag")
     String serviceTag() {
         String tag = parseServiceTag("/etc/podinfo/labels");

mse-heterogeneous-demo/SpringCloudA/src/main/java/com/alibabacloud/mse/demo/a/AController.java

@@ -22,12 +22,31 @@ public class AController {
     @Autowired
     private RestTemplate restTemplate;
 
+    @Autowired
+    private RestTemplate loadBalancedRestTemplate;
+
     @Autowired
     InetUtils inetUtils;
 
     @Autowired
     String serviceTag;
 
+    @RequestMapping(value = "/d")
+    public String d(HttpServletRequest request) throws UnknownHostException {
+
+        StringBuilder sb = new StringBuilder();
+        Enumeration<String> headers =  request.getHeaderNames();
+        if (headers.hasMoreElements()) {
+            String headerKey = headers.nextElement();
+            String value = request.getHeader(headerKey);
+            sb.append(headerKey).append(":").append(value).append(", ");
+        }
+
+        log.info("/A/d request headers info: " + sb.toString());
+        String resp = loadBalancedRestTemplate.getForObject("http://spring-cloud-d/D/d", String.class);
+        return "A:" + InetAddress.getLocalHost().getHostAddress() + ":" + serviceTag + " - " + resp;
+    }
+
     @RequestMapping(value = "/a")
     public String a(@RequestParam(name = "call_type", required = false) String callType,
                     HttpServletRequest request) throws UnknownHostException {

mse-heterogeneous-demo/SpringCloudD/src/main/java/com/alibabacloud/mse/demo/d/DController.java

@@ -27,7 +27,7 @@ public String d(HttpServletRequest request) throws UnknownHostException {
             String value = request.getHeader(headerKey);
             sb.append(headerKey).append(":").append(value).append(", ");
         }
-        log.info("/A/a request headers info: " + sb.toString());
+        log.info("/D/d request headers info: " + sb.toString());
 
         return "D:" + InetAddress.getLocalHost().getHostAddress() + ":" + serviceTag;
     }