使用mysql-binlog-connector-java监听mysql的binlog

参考:
https://blog.csdn.net/m0_37583655/article/details/119148470(代码缺失,而且没有源码)
下面是源码:
引入maven

      <dependency>
          <groupId>com.github.shyiko</groupId>
          <artifactId>mysql-binlog-connector-java</artifactId>
          <version>0.16.1</version>
      </dependency>

yml配置文件:

binlog:
  config:
    host: 127.0.0.1
    port: 3306
    username: admin
    password: root

配置类:

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;


@Component
@ConfigurationProperties(prefix = "binlog.config")
@Data
public class BinlogConfig {
    String host;
    int port;
    String username;
    String password;
}

主要代码:

import com.github.shyiko.mysql.binlog.BinaryLogClient;
import com.github.shyiko.mysql.binlog.event.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;


@Slf4j
@Component
public class BinLogRunner implements CommandLineRunner {
    @Autowired
   private BinlogConfig config;

    private HashMap<String,Long> listenerMap  =new HashMap<>();
    //需要监控的数据表 schema.tableName
    private List<String> listenerTableList = Arrays.asList("schema.tableName");


    private void putListenerMap(String database,String table , Long tableId){
        String key = database+"."+table;
        if(listenerTableList.contains(key)){
            listenerMap.put(key,tableId);
        }
    }


    private String getTableName(Long tableId){
        for (String key : listenerMap.keySet()) {
            Long aLong = listenerMap.get(key);
            if(aLong.equals(tableId)){
                return key;
            }
        }
        return null;
    }


    @Override
    public void run(String... args) throws Exception {
        String host = config.getHost();
        int port = config.getPort();
        String username = config.getUsername();
        String password = config.getPassword();
        if(CollectionUtils.isEmpty(listenerTableList)) {
            return;
        }
        BinaryLogClient client = new BinaryLogClient(host, port, username, password);
        client.registerEventListener(event -> {
            EventType eventType = event.getHeader().getEventType();
            if (eventType == EventType.TABLE_MAP) {
                TableMapEventData tableData = event.getData();
                String db = tableData.getDatabase();
                String table = tableData.getTable();
                long tableId = tableData.getTableId();
                // 第一遍  会显示数据库  第二遍有tableId
               // log.info("当前数据库: "+db+"."+table+" tableId:"+tableId);
                putListenerMap(db,table,tableId);
            }


            if(EventType.isUpdate(eventType)||EventType.isWrite(eventType)||EventType.isDelete(eventType)){
                long tableId = 0L;
                String tableName = null;
                // 如果日志是更新记录
                if (EventType.isUpdate(eventType)) {
                    UpdateRowsEventData update = event.getData();
                     tableId = update.getTableId();
                     tableName = getTableName(tableId);
                    if(tableName == null){
                        return;
                    }
                } else if (EventType.isWrite(eventType)) {
                    WriteRowsEventData write = event.getData();
                     tableId = write.getTableId();
                     tableName = getTableName(tableId);
                    if(tableName == null){
                        return;
                    }
                } else if (EventType.isDelete(eventType)) {
                    DeleteRowsEventData delete =   event.getData();
                     tableId = delete.getTableId();
                     tableName = getTableName(tableId);
                    if(tableName == null){
                        return;
                    }
                }
                tableUpdate(tableName);
            }else{
                return;
            }
        });
        client.connect();
    }

    private void tableUpdate(String tableName){
        log.info("--------------------tableName: "+tableName);
    }
}

重难点:

   client.registerEventListener(event -> {
   // 当数据更新的时候  会触发这里   触发两遍
            EventType eventType = event.getHeader().getEventType();
            if (eventType == EventType.TABLE_MAP) {
            // 第一遍类型  EventType.TABLE_MAP
            // 数据包含 tableName 和 tableId
            }
            if(EventType.isUpdate(eventType)
            ||EventType.isWrite(eventType)
            ||EventType.isDelete(eventType)){
            // 第二遍类型会是 增 删 改
            // 数据包含: 具体数据和tableId
            }
})
所以用tableId去查找tableName
注意: tableId 可能会变化,不能当作key