依赖配置：(目前暂未正式发布到mvn仓库，所以需要各位下载canal源码后手工执行下mvn clean install -Dmaven.test.skip)
+<dependency> + <groupId>com.alibaba.otter</groupId> + <artifactId>canal.client</artifactId> + <version>1.0.0</version> +</dependency>+
+
1. 创建mvn标准工程：
+mvn archetype:create -DgroupId=com.alibaba.otter -DartifactId=canal.sample+
+
2. 修改pom.xml，添加依赖
++
3. ClientSample代码
+package com.alibaba.otter.canal.sample;
+
+import java.net.InetSocketAddress;
+import java.util.List;
+
+import com.alibaba.otter.canal.common.utils.AddressUtils;
+import com.alibaba.otter.canal.protocol.Message;
+import com.alibaba.otter.canal.protocol.CanalEntry.Column;
+import com.alibaba.otter.canal.protocol.CanalEntry.Entry;
+import com.alibaba.otter.canal.protocol.CanalEntry.EntryType;
+import com.alibaba.otter.canal.protocol.CanalEntry.EventType;
+import com.alibaba.otter.canal.protocol.CanalEntry.RowChange;
+import com.alibaba.otter.canal.protocol.CanalEntry.RowData;
+
+public class SimpleCanalClientExample {
+
+ public static void main(String args[]) {
+ // 创建链接
+ CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress(AddressUtils.getHostIp(),
+ 11111), "example", "", "");
+ int batchSize = 1000;
+ int emptyCount = 0;
+ try {
+ connector.connect();
+ connector.subscribe(".*\\..*");
+ connector.rollback();
+ int totalEmtryCount = 120;
+ while (emptyCount < totalEmtryCount) {
+ 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) {
+ emptyCount++;
+ System.out.println("empty count : " + emptyCount);
+ try {
+ Thread.sleep(1000);
+ } catch (InterruptedException e) {
+ }
+ } else {
+ emptyCount = 0;
+ // System.out.printf("message[batchId=%s,size=%s] \n", batchId, size);
+ printEntry(message.getEntries());
+ }
+
+ connector.ack(batchId); // 提交确认
+ // connector.rollback(batchId); // 处理失败, 回滚数据
+ }
+
+ System.out.println("empty too many times, exit");
+ } 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 ## parser of eromanga-event has an error , 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()) {
+ 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());
+ }
+ }
+}
++
4. 运行Client
+首先启动Canal Server，可参加QuickStart : http://agapple.iteye.com/blogs/1796070
+启动Canal Client后，可以从控制台从看到类似消息：
+empty count : 1 +empty count : 2 +empty count : 3 +empty count : 4+
此时代表当前数据库无变更数据
++
5. 触发数据库变更
+mysql> use test; +Database changed +mysql> CREATE TABLE `xdual` ( + -> `ID` int(11) NOT NULL AUTO_INCREMENT, + -> `X` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, + -> PRIMARY KEY (`ID`) + -> ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8 ; +Query OK, 0 rows affected (0.06 sec) + +mysql> insert into xdual(id,x) values(null,now());Query OK, 1 row affected (0.06 sec)+
+
可以从控制台中看到：
+empty count : 1 +empty count : 2 +empty count : 3 +empty count : 4 +================> binlog[mysql-bin.001946:313661577] , name[test,xdual] , eventType : INSERT +ID : 4 update=true +X : 2013-02-05 23:29:46 update=true+
+
整个代码在附件中可以下载，如有问题可及时联系。
+ + + \ No newline at end of file