Canal Spring Boot Starter 使用实例
在spring boot 项目配置文件 application.yml内增加以下内容
spring:
canal:
instances:
example: # 拉取 example 目标的数据
host: 192.168.10.179 # canal 所在机器的ip
port: 11111 # canal 默认暴露端口
user-name: canal # canal 用户名
password: canal # canal 密码
batch-size: 600 # canal 每次拉取的数据条数
retry-count: 5 # 重试次数,如果重试5次后,仍无法连接,则断开
cluster-enabled: false # 是否开启集群
zookeeper-address: # zookeeper 地址(开启集群的情况下生效), 例: 192.168.0.1:2181,192.168.0.2:2181,192.168.0.3:2181
acquire-interval: 1000 # 未拉取到消息情况下,获取消息的时间间隔毫秒值
subscribe: .*\\..* # 默认情况下拉取所有库、所有表
在spring boot 项目中的代码使用实例
import com.alibaba.otter.canal.protocol.CanalEntry;
import com.duxinglangzi.canal.starter.annotation.CanalListener;
import com.duxinglangzi.canal.starter.annotation.CanalUpdateListener;
import org.springframework.stereotype.Service;
import java.util.stream.Collectors;
/**
* @author wuqiong 2022/4/12
* @description
*/
@Service
public class CanalListenerTest {
/**
* 目前 Listener 方法的参数必须为 CanalEntry.EventType , CanalEntry.RowData
* 程序在启动过程中会做检查
*/
/**
* 监控更新操作 ,目标是 example的 books库 users表
*/
@CanalUpdateListener(destination = "example", database = "books", table = {"users"})
public void listenerExampleBooksUsers(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
printChange("listenerExampleBooksUsers",eventType, rowData);
}
/**
* 监控更新操作 ,目标是 example的 books库 books表
*/
@CanalUpdateListener(destination = "example", database = "books", table = {"books"})
public void listenerExampleBooksBooks(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
printChange("listenerExampleBooksBooks",eventType, rowData);
}
/**
* 监控更新操作 ,目标是 example的 books库的所有表
*/
@CanalListener(destination = "example", database = "books", eventType = CanalEntry.EventType.UPDATE)
public void listenerExampleBooksAll(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
printChange("listenerExampleBooksAll",eventType, rowData);
}
/**
* 监控更新操作 ,目标是 example的 所有库的所有表
*/
@CanalListener(destination = "example", eventType = CanalEntry.EventType.UPDATE)
public void listenerExampleAll(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
printChange("listenerExampleAll",eventType, rowData);
}
/**
* 监控更新、删除、新增操作 ,所有配置的目标下的所有库的所有表
*/
@CanalListener(eventType = {CanalEntry.EventType.UPDATE, CanalEntry.EventType.INSERT, CanalEntry.EventType.DELETE})
public void listenerAllDml(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
printChange("listenerAllDml",eventType, rowData);
}
public void printChange(String method,CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
if (eventType == CanalEntry.EventType.DELETE) {
rowData.getBeforeColumnsList().stream().collect(Collectors.toList()).forEach(ele -> {
System.out.println("[方法: "+method+" , delete 语句 ] --->> 字段名: " + ele.getName() + ", 删除的值为: " + ele.getValue());
});
}
if (eventType == CanalEntry.EventType.INSERT) {
rowData.getAfterColumnsList().stream().collect(Collectors.toList()).forEach(ele -> {
System.out.println("[方法: "+method+" ,insert 语句 ] --->> 字段名: " + ele.getName() + ", 新增的值为: " + ele.getValue());
});
}
if (eventType == CanalEntry.EventType.UPDATE) {
for (int i = 0; i < rowData.getAfterColumnsList().size(); i++) {
CanalEntry.Column afterColumn = rowData.getAfterColumnsList().get(i);
CanalEntry.Column beforeColumn = rowData.getBeforeColumnsList().get(i);
System.out.println("[方法: "+method+" , update 语句 ] -->> 字段名," + afterColumn.getName() +
" , 是否修改: " + afterColumn.getUpdated() +
" , 修改前的值: " + beforeColumn.getValue() +
" , 修改后的值: " + afterColumn.getValue());
}
}
}
}