canal github地址
https://github.com/alibaba/canal/releases
執(zhí)行這個(gè)sql

show MASTER STATUS;

image.png

修改關(guān)鍵配置

canal.instance.master.address=127.0.0.1:3306  #mysql主機(jī)和端口
canal.instance.master.journal.name=mysql-bin.000002 #將上圖的file填到這里
canal.instance.master.position=2305 #將上圖的position填到這里
canal.instance.dbUsername=root #mysql用戶名
canal.instance.dbPassword=123456 #mysql密碼
canal.instance.enableDruid=false #密碼是否加密 如果是true需要填寫下面的公鑰
# canal.instance.pwdPublicKey=publicKey #密碼加密用的公鑰

密碼加密：命令行切換到druid.jar下 執(zhí)行該命令，如果密碼中有特殊字符需要使用英文雙引號(hào)包起來

java -cp druid-1.2.13.jar com.alibaba.druid.filter.config.ConfigTools WcBnMiVd"^"MvQTR%1

執(zhí)行后會(huì)生成私鑰、公鑰、密碼

image.png

創(chuàng)建用戶并授權(quán)，一定要授權(quán)?。。。?！一定要授權(quán)！?。。?！一定要授權(quán)?。。。?！一定要授權(quán)?。。。?！

CREATE USER 'canal'@'%' IDENTIFIED BY 'canal';
GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'canal'@'%';
FLUSH PRIVILEGES;

開啟mysql binlog參考這個(gè)網(wǎng)址
https://blog.csdn.net/hundan_520520/article/details/123792968?spm=1001.2014.3001.5506
啟動(dòng)canal

windows:bin目錄下雙擊startup.bat
linux:bin目錄下執(zhí)行startup.sh

maven依賴，版本要和你下載的服務(wù)端版本一致

  <dependency>
    <groupId>com.alibaba.otter</groupId>
    <artifactId>canal.client</artifactId>
    <version>1.1.4</version>
  </dependency>

上代碼

public void canal() {
        // 創(chuàng)建canal連接對(duì)象
        CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress("canal服務(wù)主機(jī)IP地址", "cannal服務(wù)端口", "example", "canal", "canal");
        try {
            //連接
            connector.connect();
            //訂閱所有數(shù)據(jù)庫和表 正則表達(dá)式 庫名.表名
            connector.subscribe("rzt.gov_ref_sys|rzt.gov_user|rzt.gov_info_user|rzt.gov_info");
            connector.rollback();
            while (true) {
                // 獲取指定數(shù)量的數(shù)據(jù)
                Message message = connector.getWithoutAck(1000);
                long batchId = message.getId();
                int size = message.getEntries().size();
                if (batchId == -1 || size == 0) {
                    //沒有數(shù)據(jù)，就休眠1秒
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                    }
                } else {
                    //有數(shù)據(jù)就打印
                    printEntry(message.getEntries());
                }
                // 提交確認(rèn)
                connector.ack(batchId);
            }
        } finally {
            connector.disconnect();
        }
    }

    private static void printEntry(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 parse data:" + entry.toString(), e);
            }
            EventType eventType = rowChage.getEventType();
            System.out.println(String.format("================> binlog[%s:%s] , name[%s,%s] , eventType : %s",
                    entry.getHeader().getLogfileName(), entry.getHeader().getLogfileOffset(),
                    entry.getHeader().getSchemaName(), entry.getHeader().getTableName(),
                    eventType));
            for (RowData rowData : rowChage.getRowDatasList()) {
                //判斷增刪改操作
                if (eventType == EventType.DELETE) {
                    printColumn(rowData.getBeforeColumnsList());
                } else if (eventType == EventType.INSERT) {
                    printColumn(rowData.getAfterColumnsList());
                } else {
                    System.out.println("-------> before");
                    printColumn(rowData.getBeforeColumnsList());
                    System.out.println("-------> after");
                    printColumn(rowData.getAfterColumnsList());
                }
            }
        }
    }

    private static void printColumn(List<Column> columns) {
        for (Column column : columns) {
            System.out.println(column.getName() + " : " + column.getValue() + " update=" + column.getUpdated());
        }
    }