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2022-04-25 3271cea1b986ee24c5bfaf2b15326554fb56090c

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de8c2b	1	# Canal Spring Boot Starter 使用实例
D	2
	3	### 在spring boot 项目配置文件 application.yml内增加以下内容
	4	```yaml
	5	spring:
	6	canal:
	7	instances:
	8	example: # 拉取 example 目标的数据
	9	host: 192.168.10.179 # canal 所在机器的ip
	10	port: 11111 # canal 默认暴露端口
	11	user-name: canal # canal 用户名
	12	password: canal # canal 密码
	13	batch-size: 600 # canal 每次拉取的数据条数
	14	retry-count: 5 # 重试次数,如果重试5次后,仍无法连接,则断开
	15	cluster-enabled: false # 是否开启集群
	16	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
	17	acquire-interval: 1000 # 未拉取到消息情况下,获取消息的时间间隔毫秒值
	18	subscribe: .\\.. # 默认情况下拉取所有库、所有表
	19
	20	```
	21
	22	### 在spring boot 项目中的代码使用实例
	23	```java
	24
	25
	26	import com.alibaba.otter.canal.protocol.CanalEntry;
	27	import com.duxinglangzi.canal.starter.annotation.CanalListener;
	28	import com.duxinglangzi.canal.starter.annotation.CanalUpdateListener;
	29	import org.springframework.stereotype.Service;
	30
	31	import java.util.stream.Collectors;
	32
	33	/**
	34	* @author wuqiong 2022/4/12
	35	* @description
	36	*/
	37	@Service
	38	public class CanalListenerTest {
	39
	40	/**
627420	41	* 目前 Listener 方法的参数必须为 CanalEntry.EventType , CanalEntry.RowData
de8c2b	42	* 程序在启动过程中会做检查
D	43	*/
	44
	45	/**
	46	* 监控更新操作，目标是 example的 books库 users表
	47	*/
	48	@CanalUpdateListener(destination = "example", database = "books", table = {"users"})
	49	public void listenerExampleBooksUsers(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	50	printChange("listenerExampleBooksUsers",eventType, rowData);
	51	}
	52
	53	/**
	54	* 监控更新操作，目标是 example的 books库 books表
	55	*/
	56	@CanalUpdateListener(destination = "example", database = "books", table = {"books"})
	57	public void listenerExampleBooksBooks(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	58	printChange("listenerExampleBooksBooks",eventType, rowData);
	59	}
	60
	61	/**
	62	* 监控更新操作，目标是 example的 books库的所有表
	63	*/
	64	@CanalListener(destination = "example", database = "books", eventType = CanalEntry.EventType.UPDATE)
	65	public void listenerExampleBooksAll(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	66	printChange("listenerExampleBooksAll",eventType, rowData);
	67	}
	68
	69	/**
	70	* 监控更新操作，目标是 example的所有库的所有表
	71	*/
	72	@CanalListener(destination = "example", eventType = CanalEntry.EventType.UPDATE)
	73	public void listenerExampleAll(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	74	printChange("listenerExampleAll",eventType, rowData);
	75	}
	76
	77	/**
	78	* 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
	79	*/
	80	@CanalListener(eventType = {CanalEntry.EventType.UPDATE, CanalEntry.EventType.INSERT, CanalEntry.EventType.DELETE})
	81	public void listenerAllDml(CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	82	printChange("listenerAllDml",eventType, rowData);
	83	}
	84
	85	public void printChange(String method,CanalEntry.EventType eventType, CanalEntry.RowData rowData) {
	86	if (eventType == CanalEntry.EventType.DELETE) {
af6d64	87	rowData.getBeforeColumnsList().stream().collect(Collectors.toList()).forEach(ele -> {
de8c2b	88	System.out.println("[方法: "+method+" , delete 语句 ] --->> 字段名: " + ele.getName() + ", 删除的值为: " + ele.getValue());
D	89	});
	90	}
	91
	92	if (eventType == CanalEntry.EventType.INSERT) {
	93	rowData.getAfterColumnsList().stream().collect(Collectors.toList()).forEach(ele -> {
	94	System.out.println("[方法: "+method+" ,insert 语句 ] --->> 字段名: " + ele.getName() + ", 新增的值为: " + ele.getValue());
	95	});
	96	}
	97
	98	if (eventType == CanalEntry.EventType.UPDATE) {
	99	for (int i = 0; i < rowData.getAfterColumnsList().size(); i++) {
	100	CanalEntry.Column afterColumn = rowData.getAfterColumnsList().get(i);
	101	CanalEntry.Column beforeColumn = rowData.getBeforeColumnsList().get(i);
	102	System.out.println("[方法: "+method+" , update 语句 ] -->> 字段名," + afterColumn.getName() +
	103	" , 是否修改: " + afterColumn.getUpdated() +
	104	" , 修改前的值: " + beforeColumn.getValue() +
	105	" , 修改后的值: " + afterColumn.getValue());
	106	}
	107	}
	108	}
	109
	110
	111	}
	112
	113
	114
	115	```
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