环境准备
1.准备jdk8环境，redis环境
2.mysql服务
2.1 自行搭建mysql
2.2 增加用户名
CREATE USER canal IDENTIFIED BY 'canal';
GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'canal'@'%';
FLUSH PRIVILEGES;
2.3 查看是否开启binlog
show variables like 'log_bin';
2.4 查看 binlog_format
show variables like 'binlog_format';
3.canal服务
3.1 下载canal
https://github.com/alibaba/canal/releases
3.2 修改配置
canal.instance.gtidon=false
# position info
# mysql地址端口
canal.instance.master.address=127.0.0.1:3306
#使用show master status;查看binlog文件名
canal.instance.master.journal.name=binlog.000009
#执行binlog更新的位置
canal.instance.master.position=155
canal.instance.master.timestamp=
canal.instance.master.gtid=
# username/password
# canal 链接数据库的用户名
canal.instance.dbUsername=canal
# # canal 链接数据库的密码
canal.instance.dbPassword=canal
canal.instance.connectionCharset = UTF-8
canal.instance.defaultDatabaseName=test
# table regex
canal.instance.filter.regex=.*\\..
3.2.1 canal.instance.master.journal.name和canal.instance.master.position查找方式
- 进入数据库查看
show master status;
3.3 启动canal
启动canal，/bin/startup.bat (windows)或则 /bin/startup.sh (linux)
4. 代码实现
4.1 CanalClient
import java.net.InetSocketAddress;
import java.util.List;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.common.utils.AddressUtils;
import com.alibaba.otter.canal.protocol.Message;
import com.alibaba.otter.canal.protocol.CanalEntry.Column;
import com.alibaba.otter.canal.protocol.CanalEntry.Entry;
import com.alibaba.otter.canal.protocol.CanalEntry.EntryType;
import com.alibaba.otter.canal.protocol.CanalEntry.EventType;
import com.alibaba.otter.canal.protocol.CanalEntry.RowChange;
import com.alibaba.otter.canal.protocol.CanalEntry.RowData;
import com.alibaba.otter.canal.client.*;
public class CanalClient {
public static void main(String args[]) {
CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress(AddressUtils.getHostIp(), 11111), "example", "canal", "canal");
int batchSize = 1000;
try {
connector.connect();
connector.subscribe(".*\\..*");
connector.rollback();
while (true) {
Message message = connector.getWithoutAck(batchSize); // 获取指定数量的数据
long batchId = message.getId();
int size = message.getEntries().size();
if (batchId == -1 || size == 0) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
} else {
processEntry(message.getEntries());
}
connector.ack(batchId); // 提交确认
// connector.rollback(batchId); // 处理失败, 回滚数据
}
} catch (Exception e) {
throw e;
} finally {
connector.disconnect();
}
}
private static void processEntry(List<Entry> entrys) {
for (Entry entry : entrys) {
if (entry.getEntryType() == EntryType.TRANSACTIONBEGIN || entry.getEntryType() == EntryType.TRANSACTIONEND) {
continue;
}
RowChange rowChage = null;
try {
rowChage = RowChange.parseFrom(entry.getStoreValue());
} catch (Exception e) {
throw new RuntimeException("ERROR ## parser of eromanga-event has an error , data:" + entry.toString(), e);
}
EventType eventType = rowChage.getEventType();
System.out.printf("================> binlog[%s:%s] , name[%s,%s] , eventType : %s%n",
entry.getHeader().getLogfileName(), entry.getHeader().getLogfileOffset(),
entry.getHeader().getSchemaName(), entry.getHeader().getTableName(),
eventType);
// 以 database:table: 作为redis的key
String key = entry.getHeader().getSchemaName() + ":" + entry.getHeader().getTableName() + ":";
for (RowData rowData : rowChage.getRowDatasList()) {
if (eventType == EventType.DELETE) {
redisDelete(rowData.getBeforeColumnsList(), key);
} else if (eventType == EventType.INSERT) {
redisInsert(rowData.getAfterColumnsList(), key);
} else {
System.out.println("-------> before");
printColumn(rowData.getBeforeColumnsList());
System.out.println("-------> after");
redisUpdate(rowData.getAfterColumnsList(), key);
}
}
}
}
private static void printColumn(List<Column> columns) {
for (Column column : columns) {
System.out.println(column.getName() + " : " + column.getValue() + " update=" + column.getUpdated());
}
}
private static void redisInsert(List<Column> columns, String key) {
JSONObject json = new JSONObject();
for (Column column : columns) {
json.put(column.getName(), column.getValue());
}
if (columns.size() > 0) {
RedisUtil.set(key + columns.get(0).getValue(), json.toJSONString());
}
}
private static void redisUpdate(List<Column> columns, String key) {
JSONObject json = new JSONObject();
for (Column column : columns) {
json.put(column.getName(), column.getValue());
}
if (columns.size() > 0) {
RedisUtil.set(key + columns.get(0).getValue(), json.toJSONString());
}
}
private static void redisDelete(List<Column> columns, String key) {
JSONObject json = new JSONObject();
for (Column column : columns) {
json.put(column.getName(), column.getValue());
}
if (columns.size() > 0) {
RedisUtil.delKey(key + columns.get(0).getValue());
}
}
}
4.2 RedisUtil
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
public class RedisUtil {
// Redis服务器IP
private static String ADDR = "127.0.0.1";
// Redis的端口号
private static int PORT = 6379;
// 访问密码
//private static String AUTH = "admin";
// 可用连接实例的最大数目，默认值为8；
// 如果赋值为-1，则表示不限制；如果pool已经分配了maxActive个jedis实例，则此时pool的状态为exhausted(耗尽)。
private static int MAX_ACTIVE = 1024;
// 控制一个pool最多有多少个状态为idle(空闲的)的jedis实例，默认值也是8。
private static int MAX_IDLE = 200;
// 等待可用连接的最大时间，单位毫秒，默认值为-1，表示永不超时。如果超过等待时间，则直接抛出JedisConnectionException；
private static int MAX_WAIT = 10000;
// 过期时间
protected static int expireTime = 60 * 60 *24;
// 连接池
protected static JedisPool pool;
/**
* 静态代码，只在初次调用一次
*/
static {
JedisPoolConfig config = new JedisPoolConfig();
//最大连接数
config.setMaxTotal(MAX_ACTIVE);
//最多空闲实例
config.setMaxIdle(MAX_IDLE);
//超时时间
config.setMaxWaitMillis(MAX_WAIT);
//
config.setTestOnBorrow(false);
pool = new JedisPool(config, ADDR, PORT, 1000);
}
/**
* 获取jedis实例
*/
protected static synchronized Jedis getJedis() {
Jedis jedis = null;
try {
jedis = pool.getResource();
} catch (Exception e) {
e.printStackTrace();
if (jedis != null) {
jedis.close();
}
}
return jedis;
}
/**
* 是否存在key
* @param key
*/
public static boolean existKey(String key) {
Jedis jedis = null;
try {
jedis = getJedis();
jedis.select(0);
return jedis.exists(key);
} catch (Exception e) {
throw new RuntimeException("existKey error", e);
} finally {
if (jedis != null) {
jedis.close();
}
}
}
/**
* 删除key
* @param key
*/
public static void delKey(String key) {
Jedis jedis = null;
try {
jedis = getJedis();
jedis.select(0);
jedis.del(key);
} catch (Exception e) {
throw new RuntimeException("delKey error", e);
} finally {
if (jedis != null) {
jedis.close();
}
}
}
/**
* 取得key的值
* @param key
*/
public static String get(String key) {
Jedis jedis = null;
String lastVal = null;
try {
jedis = getJedis();
jedis.select(0);
lastVal = jedis.get(key);
jedis.expire(key, expireTime);
} catch (Exception e) {
throw new RuntimeException("stringGet error", e);
} finally {
if (jedis != null) {
jedis.close();
}
}
return lastVal;
}
/**
* 添加string数据
* @param key
* @param value
*/
public static String set(String key, String value) {
Jedis jedis = null;
String lastVal = null;
try {
jedis = getJedis();
jedis.select(0);
lastVal = jedis.set(key, value);
jedis.expire(key, expireTime);
} catch (Exception e) {
throw new RuntimeException("stringSet error", e);
} finally {
if (jedis != null) {
jedis.close();
}
}
return lastVal;
}
/**
* 添加hash数据
* @param key
* @param field
* @param value
*/
public static void hashSet(String key, String field, String value) {
Jedis jedis = null;
try {
jedis = getJedis();
if (jedis != null) {
jedis.select(0);
jedis.hset(key, field, value);
jedis.expire(key, expireTime);
}
} catch (Exception e) {
throw new RuntimeException("hashSet error", e);
} finally {
if (jedis != null) {
jedis.close();
}
}
}
}
4.3 执行同步数据
