JAVA 获取Canal请求到的MySQL数据库BINLOG日志数据

一、介绍：

本文章是通过java项目连接Canal客户端获取，Canal通过模拟从库dump下来的BINLOG二进制文件数据。

 

二、引入pom文件：

 
            com.alibaba.otter
            canal.client
            1.1.1
 

三、Test方法测试

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 com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.common.collect.Ordering;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.collections.CollectionUtils;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

import java.net.InetSocketAddress;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@SpringBootApplication
public class TestCanal {

    @org.junit.Test
    public void getEntries() {
        CanalConnector connector = CanalConnectors
                .newSingleConnector(new InetSocketAddress("10.179.251.***", 11111), "example", "", "");//写入正确的ip和端口以及destination
        int batchSize = 1000;
        connector.connect();//获取连接
        connector.subscribe(".*\\..*");//通配此处不做更改
        connector.rollback();
        try {
            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) {//当message.getId不等于-1或0时代表监控到了数据
                } else {
                    printEntry(message.getEntries());//具体分析数据类，可根据自己需求进行修改
                }
                connector.ack(batchId); // 提交确认
            }
        } finally {
            connector.disconnect();
        }
    }

    private void printEntry(List list) {
        for (CanalEntry.Entry entry : list) {
            if (entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONBEGIN
                    || entry.getEntryType() == CanalEntry.EntryType.TRANSACTIONEND) {
                continue;//如果是事务跳过
            }
            CanalEntry.RowChange rowChage = null;
            try {
                rowChage = CanalEntry.RowChange.parseFrom(entry.getStoreValue());//获取修改的数据row
            } catch (Exception e) {
            }
            CanalEntry.EventType eventType = rowChage.getEventType();//获取类型 增删改
            if (entry.getHeader().getSchemaName().equals("mdata_dashboard")) {//库名
                if (entry.getHeader().getTableName().equals("import_second_request_volume")) {//表名
                    System.out.println("changed.");
                    //取值根据表数据自行定义修改
                    List deleteUserId = new ArrayList();
                    List updateUserId = new ArrayList();
                    for (CanalEntry.RowData rowData : rowChage.getRowDatasList()) {
                        if (eventType == eventType.DELETE) {
                            deleteUserId.add(rowData.getBeforeColumnsList().get(1).getValue());
                        } else if (eventType == eventType.INSERT || eventType == eventType.UPDATE) {
                            updateUserId.add(rowData.getAfterColumnsList().get(1).getValue());
                            updateUserId.add(rowData.getBeforeColumnsList().get(1).getValue());
                        }
                    }
                }
            }
        }
    }
}

如果只想获取字段数据

/**
     * 处理数据
     *
     * @param list
     */
    private void printEntry(List list, long batchId) {
        CryptCenterHandlerInvokeProxy proxy = ApplicationContextCapture
                .getBean(CryptCenterHandlerInvokeProxy.class);
        for (Entry entry : list) {
            if (entry.getEntryType() == EntryType.TRANSACTIONBEGIN
                    || entry.getEntryType() == EntryType.TRANSACTIONEND) {
                continue;//跳过事务
            }
            RowChange rowChage = null;
            try {
                rowChage = RowChange.parseFrom(entry.getStoreValue());//获取变更的row数据
            } catch (Exception e) {
            }
            EventType eventType = rowChage.getEventType();//获取变动类型
            entry.getHeader().getSchemaName();//获取变动库名
            entry.getHeader().getTableName();//获取变动表名

            for (RowData rowData : rowChage.getRowDatasList()) {
                Map columnMap = new HashMap();
                if (eventType == EventType.DELETE) {
                    columnMap = printColumn(rowData.getBeforeColumnsList());
                } else if (eventType == EventType.INSERT) {
                    columnMap = printColumn(rowData.getAfterColumnsList());
                } else {
                    columnMap = printColumn(rowData.getAfterColumnsList());
                }
                
            }

        }
    }

/**
*获取map 字段名，字段值， column.getUpdated()是否被更新等等，按需要进行取值
*/
private Map printColumn(List columns) {
        Map map = new HashMap<>();

        for (CanalEntry.Column column : columns) {
            map.put(column.getName(), column.getValue());
        }
        return map;
    }

打印columnMap数据结果

{
	  interface_uri = /gateway/hr - basic / openApi / V2 / getStaffInfoByLdaps,
	  total = 844147,
	  day_at = 2,
	  hour_at = 18,
	  time_at = 20200602185630,
	  second_at = 30,
	  id = 10341,
	  minute_at = 56,
	  app_id = 181211329,
	  month_at = 202006
}

 

参考文章：https://www.jianshu.com/p/23f5db8b3e25?mType=Group&from=androidqq