springboot集成canal

  注:首先数据库需要开启日志模式

[mysqld]
log-bin=/var/lib/mysql/mysql-bin # 开启 binlog
binlog-format=ROW # 选择 ROW 模式
server_id=1 # 配置 MySQL replaction 需要定义，不要和 canal 的 slaveId 重复

 ==============================================================================================================================

docker run -p 11111:11111 --name canal -id canal/canal-server

注:内存不足时canal会自动退出

docker cp canal:/home/admin/canal-server/conf/ /data/canal/

docker run -p 11111:11111 -v /data/canal/conf:/home/admin/canal-server/conf --name canal -d canal/canal-server

修改配置文件:

/data/canal/conf/example/instance.properties

修改四处
1.修改id
canal.instance.mysql.slaveId=10010
2.配置数据库连接地址
canal.instance.master.address=127.0.0.1:3306
3.配置连接数据库名称
canal.instance.dbUsername=root
4.配置连接数据库密码
canal.instance.dbUsername=root12

配置完成后重启容器即可

 ==============================================================================================================================

pom:

        
            com.alibaba.otter
            canal.client
            1.1.0
        

CanalThread:

package com.jeesun.gc.jeesunsearch.canal;

import com.alibaba.fastjson.JSONObject;
import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.client.CanalConnectors;
import com.alibaba.otter.canal.protocol.CanalEntry;
import com.alibaba.otter.canal.protocol.Message;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.net.InetSocketAddress;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author javachen
 * @date 2020/12/24 11:50
 * @desc Created with IntelliJ IDEA.
 */
public class CanalThread implements Runnable {

    Log log = LogFactory.getLog(CanalThread.class);

    @Override
    public void run() {
        listener("101.201.150.23", "11111", "mytest.goods,mytest.goods_copy");
    }


    public void listener(String canalHost, String canalPort, String table) {
        // 创建链接
        CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress(canalHost, Integer.valueOf(canalPort)), "example", "", "");
        int batchSize = 1000;
        try {
            // 连接
            connector.connect();
            // 监听表
            connector.subscribe(table);
            connector.rollback();
            // 一直循环监听
            while (true) {
                // 获取指定数量的数据
                Message message = connector.getWithoutAck(batchSize);
                long batchId = message.getId();
                if(-1 != batchId && 0 != message.getEntries().size()) {
                    printEntry(message.getEntries());
                }
                // 提交确认
                connector.ack(batchId);
            }
        } finally {
            connector.disconnect();
        }
    }

    /**
     * 打印具体变化
     * @param entrys
     */
    private void printEntry(List entrys) {
        for (CanalEntry.Entry entry : entrys) {
            if (CanalEntry.EntryType.TRANSACTIONBEGIN.equals(entry.getEntryType()) || CanalEntry.EntryType.TRANSACTIONEND.equals(entry.getEntryType())) {
                continue;
            }

            CanalEntry.RowChange rowChage = null;
            try {
                rowChage = CanalEntry.RowChange.parseFrom(entry.getStoreValue());
            } catch (Exception e) {
                throw new RuntimeException("ERROR ## parser of eromanga-event has an error , data:" + entry.toString(),
                        e);
            }

            CanalEntry.EventType eventType = rowChage.getEventType();
            System.out.println(String.format("================> binlog[%s:%s] , 数据库：%s，表名%s , 类型: %s",
                    entry.getHeader().getLogfileName(), entry.getHeader().getLogfileOffset(),
                    entry.getHeader().getSchemaName(), entry.getHeader().getTableName(),
                    eventType));

            for (CanalEntry.RowData rowData : rowChage.getRowDatasList()) {
                if (eventType == CanalEntry.EventType.DELETE) {
                    printColumn(rowData.getBeforeColumnsList());
                } else if (eventType == CanalEntry.EventType.INSERT) {
                    printColumn(rowData.getAfterColumnsList());
                } else {
                    System.out.println("-------修改之前");
                    printColumn(rowData.getBeforeColumnsList());
                    System.out.println("-------修改之后");
                    printColumn(rowData.getAfterColumnsList());
                }
            }
        }
    }

    private void printColumn(List columns) {
        Map aaMap = new HashMap<>();
        for (CanalEntry.Column column : columns) {
            aaMap.put(column.getName(), column.getValue());
        }
        System.out.println( new JSONObject(aaMap).toJSONString());
    }
}

JeesunSearchApplicationL

package com.jeesun.gc.jeesunsearch;

import com.jeesun.gc.jeesunsearch.canal.CanalThread;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class JeesunSearchApplication {

    public static void main(String[] args) {
        SpringApplication.run(JeesunSearchApplication.class, args);
        new Thread(new CanalThread()).start();
    }

}