befor update

license/src/main/java/iot/sixiang/license/balance/BalanceManager.java

+package iot.sixiang.license.balance;
+
+import iot.sixiang.license.entity.Server;
+import iot.sixiang.license.service.ServerService;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import javax.annotation.PostConstruct;
+import java.util.*;
+
+@Component
+@Slf4j
+public class BalanceManager {
+    @Autowired
+    private ServerService serverService;
+
+    private Map<String, Server> allServers = null;
+
+    public BalanceManager() {
+        allServers = new HashMap<String, Server>();
+    }
+
+    @PostConstruct
+    public void init() {
+        List<Server> servers = serverService.getServerList(0, 20);
+        for (Server server : servers) {
+            String serverIp = server.getServerIp();
+            allServers.put(serverIp, server);
+        }
+
+    }
+
+    public Server getBalanceServer() {
+        int count = allServers.size();
+        if (count == 0) {
+            return null;
+        } else {
+            Random random = new Random();
+            int index = random.nextInt(count);
+            List<Server> servers = new ArrayList<>(allServers.values());
+            return servers.get(index);
+        }
+
+
+    }
+}