项目源码： https://gitee.com/benwang6/rocketmq-dtx

安装搭建 Rocketmq 服务器

搭建单机 Rocketmq 服务器笔记：
《RocketMQ (一) 安装》

搭建双主双从同步复制 Rocketmq 服务器笔记：
《RocketMQ (二) 双主双从同步复制集群方案》

基于 Rocketmq 可靠消息的分布式事务方案原理

Rocketmq事务消息笔记：
《RocketMQ 发送事务消息原理分析和代码实现》

准备订单项目案例

新建 rocketmq-dtx 工程

新建 Empty Project：

工程命名为 rocketmq-dtx，存放到任意文件夹下：

导入订单项目，无事务版本

下载项目代码

访问 git 仓库 https://gitee.com/benwang6/seata-samples
访问项目标签

下载无事务版

解压到 rocketmq-dtx 目录

压缩文件中的 7 个项目目录解压缩到 rocketmq-dtx 目录：

导入项目

在 idea 中按两下 shift 键，搜索 add maven projects，打开 maven 工具：

然后选择 rocketmq-dtx 工程目录下的 7 个项目的 pom.xml 导入：

order 添加事务状态表

Rocketmq收到事务消息后，会等待生产者提交或回滚该消息。如果无法得到生产者的提交或回滚指令，则会主动向生产者询问消息状态，称为回查。

在 order 项目中，为了让Rocketmq可以回查到事务的状态，需要记录事务的状态，所以我们添加一个事务的状态表来记录事务状态。

修改 db-init 项目中的 order.sql 文件，创建 tx_table 表：

drop database if exists `seata_order`;

CREATE DATABASE `seata_order` charset utf8;

use `seata_order`;

CREATE TABLE `order` (
`id` bigint(11) NOT NULL,
`user_id` bigint(11) DEFAULT NULL COMMENT '用户id',
`product_id` bigint(11) DEFAULT NULL COMMENT '产品id',
`count` int(11) DEFAULT NULL COMMENT '数量',
`money` decimal(11,0) DEFAULT NULL COMMENT '金额',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;

ALTER TABLE `order` ADD COLUMN `status` int(1) DEFAULT NULL COMMENT '订单状态：0：创建中；1：已完结' AFTER `money` ;

-- for AT mode you must to init this sql for you business database. the seata server not need it.
CREATE TABLE IF NOT EXISTS `undo_log`
(
`branch_id` BIGINT(20) NOT NULL COMMENT 'branch transaction id',
`xid` VARCHAR(100) NOT NULL COMMENT 'global transaction id',
`context` VARCHAR(128) NOT NULL COMMENT 'undo_log context,such as serialization',
`rollback_info` LONGBLOB NOT NULL COMMENT 'rollback info',
`log_status` INT(11) NOT NULL COMMENT '0:normal status,1:defense status',
`log_created` DATETIME(6) NOT NULL COMMENT 'create datetime',
`log_modified` DATETIME(6) NOT NULL COMMENT 'modify datetime',
UNIQUE KEY `ux_undo_log` (`xid`, `branch_id`)
) ENGINE = InnoDB
AUTO_INCREMENT = 1
DEFAULT CHARSET = utf8 COMMENT ='AT transaction mode undo table';

CREATE TABLE IF NOT EXISTS segment
(
id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY COMMENT '自增主键',
VERSION BIGINT DEFAULT 0 NOT NULL COMMENT '版本号',
business_type VARCHAR(63) DEFAULT '' NOT NULL COMMENT '业务类型，唯一',
max_id BIGINT DEFAULT 0 NOT NULL COMMENT '当前最大id',
step INT DEFAULT 0 NULL COMMENT '步长',
increment INT DEFAULT 1 NOT NULL COMMENT '每次id增量',
remainder INT DEFAULT 0 NOT NULL COMMENT '余数',
created_at BIGINT UNSIGNED NOT NULL COMMENT '创建时间',
updated_at BIGINT UNSIGNED NOT NULL COMMENT '更新时间',
CONSTRAINT uniq_business_type UNIQUE (business_type)
) CHARSET = utf8mb4
ENGINE INNODB COMMENT '号段表';

INSERT INTO segment
(VERSION, business_type, max_id, step, increment, remainder, created_at, updated_at)
VALUES (1, 'order_business', 1000, 1000, 1, 0, NOW(), NOW());

CREATE TABLE tx_table(
   `xid` char(32) PRIMARY KEY COMMENT '事务id',
   `status` int COMMENT '0-提交，1-回滚，2-未知',
   `created_at` BIGINT UNSIGNED NOT NULL COMMENT '创建时间'
);

运行 db-init 项目，会创建这个表：

order 发送事务消息，并执行本地事务

Rocketmq 中添加 Topic

使用 order-topic 来收发消息，在 Rocketmq 服务器上创建这个 Topic：

order-parent 中添加 rocketmq 起步依赖

修改 pom.xml 添加以下内容：

在 properties 中设置 rocketmq 起步依赖的版本

<rocketmq-spring-boot-starter.version>2.1.0</rocketmq-spring-boot-starter.version>

添加 rocketmq 起步依赖：

<dependency>
<groupId>org.apache.rocketmq</groupId>
<artifactId>rocketmq-spring-boot-starter</artifactId>
<version>${rocketmq-spring-boot-starter.version}</version>
</dependency>

order 项目中添加 rocketmq 连接信息配置：

修改 order 项目的 application.yml，添加 NameServer 地址，指定生产者组名：

rocketmq:
name-server: 192.168.64.151:9876;192.168.64.152:9876
producer:
group: order-group

添加 `TxMapper` 访问事务状态表

事务状态保存到 tx_table 表，在 TxMapper 接口和 TxMapper.xml 中添加事务状态数据的读写方法。

本地事务执行后要保存事务信息（事务id、事务状态）到数据库，以便之后进行事务回查，首先创建封装事务信息的类 TxInfo ：

package cn.tedu.order.tx;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class TxInfo {
private String xid;
private Long created;
private Integer status;
}

TxMapper 接口：

package cn.tedu.order.mapper;

import cn.tedu.order.tx.TxInfo;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;

public interface TxMapper extends BaseMapper<TxInfo> {
Boolean exists(String xid);
}
TxMapper.xml ：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="cn.tedu.order.mapper.TxMapper" >
<resultMap id="BaseResultMap" type="cn.tedu.order.tx.TxInfo" >
<id column="xid" property="xid" jdbcType="CHAR" />
<result column="created_at" property="created" jdbcType="BIGINT" />
<result column="status" property="status" jdbcType="INTEGER"/>
</resultMap>

<insert id="insert">
INSERT INTO `tx_table`(`xid`,`created_at`,`status`) VALUES(#{xid},#{created},#{status});
</insert>
<select id="exists" resultType="boolean">
SELECT COUNT(1) FROM tx_table WHERE xid=#{xid};
</select>
<select id="selectById" resultMap="BaseResultMap">
SELECT `xid`,`created_at`,`status` FROM tx_table WHERE xid=#{xid};
</select>
</mapper>

Json处理工具

发送事务消息时，我们把事务对象序列化成 Json 字符串再发送。这里先添加一个工具 JsonUtil 用来处理 Json：

package cn.tedu.order.util;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Writer;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang3.StringUtils;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.module.paramnames.ParameterNamesModule;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class JsonUtil {
private static ObjectMapper mapper;
private static JsonInclude.Include DEFAULT_PROPERTY_INCLUSION = JsonInclude.Include.NON_DEFAULT;
private static boolean IS_ENABLE_INDENT_OUTPUT = false;
private static String CSV_DEFAULT_COLUMN_SEPARATOR = ",";
static {
try {
initMapper();
configPropertyInclusion();
configIndentOutput();
configCommon();
} catch (Exception e) {
log.error("jackson config error", e);
}
}

private static void initMapper() {
mapper = new ObjectMapper();
}

private static void configCommon() {
config(mapper);
}

private static void configPropertyInclusion() {
mapper.setSerializationInclusion(DEFAULT_PROPERTY_INCLUSION);
}

private static void configIndentOutput() {
mapper.configure(SerializationFeature.INDENT_OUTPUT, IS_ENABLE_INDENT_OUTPUT);
}

private static void config(ObjectMapper objectMapper) {
objectMapper.enable(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN);
objectMapper.enable(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
objectMapper.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY);
objectMapper.enable(DeserializationFeature.FAIL_ON_READING_DUP_TREE_KEY);
objectMapper.enable(DeserializationFeature.FAIL_ON_NUMBERS_FOR_ENUMS);
objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
objectMapper.disable(DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES);
objectMapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
objectMapper.enable(JsonParser.Feature.ALLOW_COMMENTS);
objectMapper.disable(JsonGenerator.Feature.ESCAPE_NON_ASCII);
objectMapper.enable(JsonGenerator.Feature.IGNORE_UNKNOWN);
objectMapper.enable(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES);
objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
objectMapper.enable(JsonParser.Feature.ALLOW_SINGLE_QUOTES);
objectMapper.registerModule(new ParameterNamesModule());
objectMapper.registerModule(new Jdk8Module());
objectMapper.registerModule(new JavaTimeModule());
}
public static void setSerializationInclusion(JsonInclude.Include inclusion) {
DEFAULT_PROPERTY_INCLUSION = inclusion;
configPropertyInclusion();
}

public static void setIndentOutput(boolean isEnable) {
IS_ENABLE_INDENT_OUTPUT = isEnable;
configIndentOutput();
}

public static <V> V from(URL url, Class<V> c) {
try {
return mapper.readValue(url, c);
} catch (IOException e) {
log.error("jackson from error, url: {}, type: {}", url.getPath(), c, e);
return null;
}
}

public static <V> V from(InputStream inputStream, Class<V> c) {
try {
return mapper.readValue(inputStream, c);
} catch (IOException e) {
log.error("jackson from error, type: {}", c, e);
return null;
}
}

public static <V> V from(File file, Class<V> c) {
try {
return mapper.readValue(file, c);
} catch (IOException e) {
log.error("jackson from error, file path: {}, type: {}", file.getPath(), c, e);
return null;
}
}

public static <V> V from(Object jsonObj, Class<V> c) {
try {
return mapper.readValue(jsonObj.toString(), c);
} catch (IOException e) {
log.error("jackson from error, json: {}, type: {}", jsonObj.toString(), c, e);
return null;
}
}

public static <V> V from(String json, Class<V> c) {
try {
return mapper.readValue(json, c);
} catch (IOException e) {
log.error("jackson from error, json: {}, type: {}", json, c, e);
return null;
}
}

public static <V> V from(URL url, TypeReference<V> type) {
try {
return mapper.readValue(url, type);
} catch (IOException e) {
log.error("jackson from error, url: {}, type: {}", url.getPath(), type, e);
return null;
}
}

public static <V> V from(InputStream inputStream, TypeReference<V> type) {
try {
return mapper.readValue(inputStream, type);
} catch (IOException e) {
log.error("jackson from error, type: {}", type, e);
return null;
}
}

public static <V> V from(File file, TypeReference<V> type) {
try {
return mapper.readValue(file, type);
} catch (IOException e) {
log.error("jackson from error, file path: {}, type: {}", file.getPath(), type, e);
return null;
}
}

public static <V> V from(Object jsonObj, TypeReference<V> type) {
try {
return mapper.readValue(jsonObj.toString(), type);
} catch (IOException e) {
log.error("jackson from error, json: {}, type: {}", jsonObj.toString(), type, e);
return null;
}
}

public static <V> V from(String json, TypeReference<V> type) {
try {
return mapper.readValue(json, type);
} catch (IOException e) {
log.error("jackson from error, json: {}, type: {}", json, type, e);
return null;
}
}

public static <V> String to(List<V> list) {
try {
return mapper.writeValueAsString(list);
} catch (JsonProcessingException e) {
log.error("jackson to error, obj: {}", list, e);
return null;
}
}

public static <V> String to(V v) {
try {
return mapper.writeValueAsString(v);
} catch (JsonProcessingException e) {
log.error("jackson to error, obj: {}", v, e);
return null;
}
}

public static <V> void toFile(String path, List<V> list) {
try (Writer writer = new FileWriter(new File(path), true)) {
mapper.writer().writeValues(writer).writeAll(list);
writer.flush();
} catch (Exception e) {
log.error("jackson to file error, path: {}, list: {}", path, list, e);
}
}

public static <V> void toFile(String path, V v) {
try (Writer writer = new FileWriter(new File(path), true)) {
mapper.writer().writeValues(writer).write(v);
writer.flush();
} catch (Exception e) {
log.error("jackson to file error, path: {}, obj: {}", path, v, e);
}
}

public static String getString(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
try {
JsonNode node = mapper.readTree(json);
if (null != node) {
return node.get(key).asText();
} else {
return null;
}
} catch (IOException e) {
log.error("jackson get string error, json: {}, key: {}", json, key, e);
return null;
}
}

public static Integer getInt(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
try {
JsonNode node = mapper.readTree(json);
if (null != node) {
return node.get(key).intValue();
} else {
return null;
}
} catch (IOException e) {
log.error("jackson get int error, json: {}, key: {}", json, key, e);
return null;
}
}

public static Long getLong(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
try {
JsonNode node = mapper.readTree(json);
if (null != node) {
return node.get(key).longValue();
} else {
return null;
}
} catch (IOException e) {
log.error("jackson get long error, json: {}, key: {}", json, key, e);
return null;
}
}

public static Double getDouble(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
try {
JsonNode node = mapper.readTree(json);
if (null != node) {
return node.get(key).doubleValue();
} else {
return null;
}
} catch (IOException e) {
log.error("jackson get double error, json: {}, key: {}", json, key, e);
return null;
}
}

public static BigInteger getBigInteger(String json, String key) {
if (StringUtils.isEmpty(json)) {
return new BigInteger(String.valueOf(0.00));
}
try {
JsonNode node = mapper.readTree(json);
if (null != node) {
return node.get(key).bigIntegerValue();
} else {
return null;
}
} catch (IOException e) {
log.error("jackson get biginteger error, json: {}, key: {}", json, key, e);
return null;
}
}

public static BigDecimal getBigDecimal(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
try {
JsonNode node = mapper.readTree(json);
if (null != node) {
return node.get(key).decimalValue();
} else {
return null;
}
} catch (IOException e) {
log.error("jackson get bigdecimal error, json: {}, key: {}", json, key, e);
return null;
}
}

public static boolean getBoolean(String json, String key) {
if (StringUtils.isEmpty(json)) {
return false;
}
try {
JsonNode node = mapper.readTree(json);
if (null != node) {
return node.get(key).booleanValue();
} else {
return false;
}
} catch (IOException e) {
log.error("jackson get boolean error, json: {}, key: {}", json, key, e);
return false;
}
}

public static byte[] getByte(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
try {
JsonNode node = mapper.readTree(json);
if (null != node) {
return node.get(key).binaryValue();
} else {
return null;
}
} catch (IOException e) {
log.error("jackson get byte error, json: {}, key: {}", json, key, e);
return null;
}
}

public static <T> ArrayList<T> getList(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
String string = getString(json, key);
return from(string, new TypeReference<ArrayList<T>>() {});
}

public static <T> String add(String json, String key, T value) {
try {
JsonNode node = mapper.readTree(json);
add(node, key, value);
return node.toString();
} catch (IOException e) {
log.error("jackson add error, json: {}, key: {}, value: {}", json, key, value, e);
return json;
}
}

private static <T> void add(JsonNode jsonNode, String key, T value) {
if (value instanceof String) {
((ObjectNode) jsonNode).put(key, (String) value);
} else if (value instanceof Short) {
((ObjectNode) jsonNode).put(key, (Short) value);
} else if (value instanceof Integer) {
((ObjectNode) jsonNode).put(key, (Integer) value);
} else if (value instanceof Long) {
((ObjectNode) jsonNode).put(key, (Long) value);
} else if (value instanceof Float) {
((ObjectNode) jsonNode).put(key, (Float) value);
} else if (value instanceof Double) {
((ObjectNode) jsonNode).put(key, (Double) value);
} else if (value instanceof BigDecimal) {
((ObjectNode) jsonNode).put(key, (BigDecimal) value);
} else if (value instanceof BigInteger) {
((ObjectNode) jsonNode).put(key, (BigInteger) value);
} else if (value instanceof Boolean) {
((ObjectNode) jsonNode).put(key, (Boolean) value);
} else if (value instanceof byte[]) {
((ObjectNode) jsonNode).put(key, (byte[]) value);
} else {
((ObjectNode) jsonNode).put(key, to(value));
}
}

public static String remove(String json, String key) {
try {
JsonNode node = mapper.readTree(json);
((ObjectNode) node).remove(key);
return node.toString();
} catch (IOException e) {
log.error("jackson remove error, json: {}, key: {}", json, key, e);
return json;
}
}

public static <T> String update(String json, String key, T value) {
try {
JsonNode node = mapper.readTree(json);
((ObjectNode) node).remove(key);
add(node, key, value);
return node.toString();
} catch (IOException e) {
log.error("jackson update error, json: {}, key: {}, value: {}", json, key, value, e);
return json;
}
}

public static String format(String json) {
try {
JsonNode node = mapper.readTree(json);
return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(node);
} catch (IOException e) {
log.error("jackson format json error, json: {}", json, e);
return json;
}
}

public static boolean isJson(String json) {
try {
mapper.readTree(json);
return true;
} catch (Exception e) {
log.error("jackson check json error, json: {}", json, e);
return false;
}
}

private static InputStream getResourceStream(String name) {
return JsonUtil.class.getClassLoader().getResourceAsStream(name);
}

private static InputStreamReader getResourceReader(InputStream inputStream) {
if (null == inputStream) {
return null;
}
return new InputStreamReader(inputStream, StandardCharsets.UTF_8);
}
}

废弃 `OrderServiceImpl` 类

之前的业务实现类 OrderServiceImpl 废弃，后面用一个新的类 TxOrderService 来代替。

OrderServiceImpl.java 直接删除即可。

`TxOrderService` 发送事务消息

TxAccountMessage 封装发送给账户服务的数据：用户id和扣减金额。另外还封装了事务id。

package cn.tedu.order.tx;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.math.BigDecimal;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class TxAccountMessage {
Long userId;
BigDecimal money;
String xid;
}

在业务方法 create() 中不直接保存订单，而是发送事务消息。

消息发出后，会触发 TxListener 执行本地事务，它执行时会回调这里的 doCreate() 方法完成订单的保存。

package cn.tedu.order.tx;

import cn.tedu.order.entity.Order;
import cn.tedu.order.feign.EasyIdGeneratorClient;
import cn.tedu.order.mapper.OrderMapper;
import cn.tedu.order.mapper.TxMapper;
import cn.tedu.order.service.OrderService;
import cn.tedu.order.util.JsonUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.rocketmq.spring.core.RocketMQTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Primary;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.UUID;

@Slf4j
@Primary
@Service
public class TxOrderService implements OrderService {
@Autowired
private RocketMQTemplate rocketMQTemplate;
@Autowired
private OrderMapper orderMapper;
@Autowired
private TxMapper txMapper;
@Autowired
EasyIdGeneratorClient easyIdGeneratorClient;

/*
创建订单的业务方法
这里修改为：只向 Rocketmq 发送事务消息。
*/
@Override
public void create(Order order) {
// 产生事务ID
String xid = UUID.randomUUID().toString().replace("-", "");

//对事务相关数据进行封装，并转成 json 字符串
TxAccountMessage sMsg = new TxAccountMessage(order.getUserId(), order.getMoney(), xid);
String json = JsonUtil.to(sMsg);

//json字符串封装到 Spring Message 对象
Message<String> msg = MessageBuilder.withPayload(json).build();

//发送事务消息
rocketMQTemplate.sendMessageInTransaction("order-topic:account", msg, order);
log.info("事务消息已发送");
}

//本地事务，执行订单保存
//这个方法在事务监听器中调用
@Transactional
public void doCreate(Order order, String xid) {
log.info("执行本地事务，保存订单");

// 从全局唯一id发号器获得id
Long orderId = easyIdGeneratorClient.nextId("order_business");
order.setId(orderId);

orderMapper.create(order);

log.info("订单已保存！事务日志已保存");
}
}

`TxListener` 事务监听器

发送事务消息后会触发事务监听器执行。

事务监听器有两个方法：

executeLocalTransaction()：执行本地事务
checkLocalTransaction()：负责响应Rocketmq服务器的事务回查操作

TxListener 监听器类：

package cn.tedu.order.tx;

import cn.tedu.order.entity.Order;
import cn.tedu.order.mapper.TxMapper;
import cn.tedu.order.util.JsonUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.rocketmq.spring.annotation.RocketMQTransactionListener;
import org.apache.rocketmq.spring.core.RocketMQLocalTransactionListener;
import org.apache.rocketmq.spring.core.RocketMQLocalTransactionState;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.Message;
import org.springframework.stereotype.Component;

@Slf4j
@Component
@RocketMQTransactionListener
public class TxListener implements RocketMQLocalTransactionListener {
@Autowired
private TxOrderService orderService;
@Autowired
private TxMapper txMapper;

@Override
public RocketMQLocalTransactionState executeLocalTransaction(Message message, Object o) {
log.info("事务监听 - 开始执行本地事务");

// 监听器中得到的 message payload 是 byte[]
String json = new String((byte[]) message.getPayload());
String xid = JsonUtil.getString(json, "xid");

log.info("事务监听 - "+json);
log.info("事务监听 - xid: "+xid);

RocketMQLocalTransactionState state;
int status = 0;
Order order = (Order) o;

try {
orderService.doCreate(order, xid);

log.info("本地事务执行成功，提交消息");
state = RocketMQLocalTransactionState.COMMIT;
status = 0;
} catch (Exception e) {
e.printStackTrace();
log.info("本地事务执行失败，回滚消息");
state = RocketMQLocalTransactionState.ROLLBACK;
status = 1;
}

TxInfo txInfo = new TxInfo(xid, System.currentTimeMillis(), status);
txMapper.insert(txInfo);

return state;
}

@Override
public RocketMQLocalTransactionState checkLocalTransaction(Message message) {
log.info("事务监听 - 回查事务状态");

// 监听器中得到的 message payload 是 byte[]
String json = new String((byte[]) message.getPayload());
String xid = JsonUtil.getString(json, "xid");

TxInfo txInfo = txMapper.selectById(xid);
if (txInfo == null) {
log.info("事务监听 - 回查事务状态 - 事务不存在："+xid);
return RocketMQLocalTransactionState.UNKNOWN;
}

log.info("事务监听 - 回查事务状态 - "+ txInfo.getStatus());

switch (txInfo.getStatus()) {
case 0: return RocketMQLocalTransactionState.COMMIT;
case 1: return RocketMQLocalTransactionState.ROLLBACK;
default: return RocketMQLocalTransactionState.UNKNOWN;
}
}
}

启动订单项目进行测试

按顺序启动项目：

Eureka
Easy Id Generator
Order

调用保存订单，地址：
http://localhost:8083/create?userId=1&productId=1&count=10&money=100

观察控制台日志：

订单表：

事务表：

访问 Rocketmq，查看事务消息：

account 接收事务消息，并执行本地事务

`application.yml` 添加 Rocketmq 连接配置

rocketmq:
name-server: 192.168.64.151:9876;192.168.64.152:9876

`JsonUtil` 工具类

package cn.tedu.account.util;

import java.io.*;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;