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/**
 * Ping this influxDB.
 */
public Pong ping();

2. version()

/**
 * Return the version of the connected influxDB Server.
 */
public String version();

3. write()

write函数有很多接口，实现的接口有：

/**
 * Write a single Point to the default database.
 */
public void write(final Point point);

/**
 * Write a set of Points to the default database with the string records.
 */
public void write(final String records);

/**
 * Write a set of Points to the default database with the list of string records.]]
 */
public void write(final List<String> records);

/**
 * Write a single Point to the database.
 */
public void write(final String database, final String retentionPolicy, final Point point);

/**
 * Write a single Point to the database through UDP.
 */
public void write(final int udpPort, final Point point);

/**
 * Write a set of Points to the influxdb database with the new lineprotocol.
 */
public void write(final BatchPoints batchPoints);

/**
 * Write a set of Points to the influxdb database with the new lineprotocol.
 *
 * If batching is enabled with appropriate {@code BatchOptions} settings
 * ({@code BatchOptions.bufferLimit} greater than {@code BatchOptions.actions})
 * This method will try to retry in case of some recoverable errors.
 * Otherwise it just works as {@link #write(BatchPoints)}
 */
public void writeWithRetry(final BatchPoints batchPoints);

/**
 * Write a set of Points to the influxdb database with the string records.
 */
public void write(final String database, final String retentionPolicy,
                  final ConsistencyLevel consistency, final String records);

/**
 * Write a set of Points to the influxdb database with the string records.
 * @return the response of the ping execution/
public void write(final String database, final String retentionPolicy,
        final ConsistencyLevel consistency, final TimeUnit precision, final String records);

/**
 * Write a set of Points to the influxdb database with the list of string records.
 */
public void write(final String database, final String retentionPolicy,
                  final ConsistencyLevel consistency, final List<String> records);

/**
 * Write a set of Points to the influxdb database with the list of string records.
 */
public void write(final String database, final String retentionPolicy,
        final ConsistencyLevel consistency, final TimeUnit precision, final List<String> records);

/**
 * Write a set of Points to the influxdb database with the string records through UDP.
 */
public Pongvoid ping();

...

write(final int udpPort, final String records);

/**
 * Write a set of Points to the influxdb database with the list of string records through UDP.
 */
public void write(final int udpPort, final List<String> records);

/**
 * Return the version of the connected influxDB Server.
 *
 * @return the version String, otherwise unknown.
 */
public String version();