Add API for getting all available JDBC driver classes
diff --git a/shardingsphere-elasticjob-lite-ui/shardingsphere-elasticjob-lite-ui-backend/src/main/java/org/apache/shardingsphere/elasticjob/lite/ui/web/controller/EventTraceDataSourceController.java b/shardingsphere-elasticjob-lite-ui/shardingsphere-elasticjob-lite-ui-backend/src/main/java/org/apache/shardingsphere/elasticjob/lite/ui/web/controller/EventTraceDataSourceController.java
index 5ae8989..b16a1cd 100644
--- a/shardingsphere-elasticjob-lite-ui/shardingsphere-elasticjob-lite-ui-backend/src/main/java/org/apache/shardingsphere/elasticjob/lite/ui/web/controller/EventTraceDataSourceController.java
+++ b/shardingsphere-elasticjob-lite-ui/shardingsphere-elasticjob-lite-ui-backend/src/main/java/org/apache/shardingsphere/elasticjob/lite/ui/web/controller/EventTraceDataSourceController.java
@@ -33,7 +33,10 @@
 
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpSession;
+import java.sql.Driver;
 import java.util.Collection;
+import java.util.HashSet;
+import java.util.ServiceLoader;
 
 /**
  * Event trace data source RESTful API.
@@ -52,6 +55,18 @@
     }
     
     /**
+     * Get all available driver classes.
+     *
+     * @return Driver classes
+     */
+    @GetMapping("/drivers")
+    public ResponseResult<Collection<String>> availableDrivers() {
+        Collection<String> result = new HashSet<>();
+        ServiceLoader.load(Driver.class).forEach(each -> result.add(each.getClass().getName()));
+        return ResponseResultUtil.build(result);
+    }
+    
+    /**
      * Judge whether event trace data source is activated.
      *
      * @param request HTTP request