fix: refine example (#22325)

* fix: use latest version of jdbc connector

* fix: remove locale and timezone to avoid confusing user

* fix: update readme.md

examples/JDBC/JDBCDemo/readme.md

@@ -20,18 +20,12 @@ mvn clean compile exec:java -Dexec.mainClass="com.taosdata.example.JdbcDemo" -De
 ```
 
 ## Compile the Demo Code and Run It
-To compile taos-jdbcdriver, go to the source directory ``TDengine/src/connector/jdbc`` and execute
 ```
 mvn clean package -Dmaven.test.skip=true
 ```
 
-To compile the demo project, go to the source directory ``TDengine/tests/examples/JDBC/JDBCDemo`` and execute
+To run JDBCDemo.jar, execute
 ```
-mvn clean package assembly:single
-```
-
-To run JDBCDemo.jar, go to ``TDengine/tests/examples/JDBC/JDBCDemo`` and execute
-```
-java -Djava.ext.dirs=../../../../src/connector/jdbc/target:$JAVA_HOME/jre/lib/ext -jar target/JDBCDemo-SNAPSHOT-jar-with-dependencies.jar -host [HOSTNAME]
+java -jar target/JDBCDemo-SNAPSHOT-jar-with-dependencies.jar -host [HOSTNAME]
 ```
 

examples/JDBC/JDBCDemo/src/main/java/com/taosdata/example/JdbcRestfulDemo.java

@@ -16,8 +16,6 @@ public class JdbcRestfulDemo {
 
             Properties properties = new Properties();
             properties.setProperty("charset", "UTF-8");
-            properties.setProperty("locale", "en_US.UTF-8");
-            properties.setProperty("timezone", "UTC-8");
 
             Connection conn = DriverManager.getConnection(url, properties);
             Statement stmt = conn.createStatement();