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第十九篇 : Spring Boot 集成 Seata 解决分布式事务问题
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‎springboot-seata/sbm-account-service/.gitignore‎

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HELP.md
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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**
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!**/src/test/**
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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### VS Code ###
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.vscode/

‎springboot-seata/sbm-account-service/.mvn/wrapper/MavenWrapperDownloader.java‎

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/*
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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*/
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.net.URL;
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import java.nio.channels.Channels;
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import java.nio.channels.ReadableByteChannel;
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import java.util.Properties;
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public class MavenWrapperDownloader {
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/**
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* Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
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*/
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private static final String DEFAULT_DOWNLOAD_URL =
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"https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.4.2/maven-wrapper-0.4.2.jar";
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/**
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* Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
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* use instead of the default one.
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*/
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private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
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".mvn/wrapper/maven-wrapper.properties";
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/**
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* Path where the maven-wrapper.jar will be saved to.
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*/
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private static final String MAVEN_WRAPPER_JAR_PATH =
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".mvn/wrapper/maven-wrapper.jar";
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/**
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* Name of the property which should be used to override the default download url for the wrapper.
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*/
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private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
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public static void main(String args[]) {
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System.out.println("- Downloader started");
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File baseDirectory = new File(args[0]);
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System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
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// If the maven-wrapper.properties exists, read it and check if it contains a custom
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// wrapperUrl parameter.
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File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
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String url = DEFAULT_DOWNLOAD_URL;
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if (mavenWrapperPropertyFile.exists()) {
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FileInputStream mavenWrapperPropertyFileInputStream = null;
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try {
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mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
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Properties mavenWrapperProperties = new Properties();
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mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
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url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
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} catch (IOException e) {
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System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
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} finally {
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try {
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if (mavenWrapperPropertyFileInputStream != null) {
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mavenWrapperPropertyFileInputStream.close();
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}
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} catch (IOException e) {
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// Ignore ...
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}
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}
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}
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System.out.println("- Downloading from: : " + url);
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File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
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if (!outputFile.getParentFile().exists()) {
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if (!outputFile.getParentFile().mkdirs()) {
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System.out.println(
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"- ERROR creating output direcrory '" + outputFile.getParentFile().getAbsolutePath() + "'");
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}
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}
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System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
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try {
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downloadFileFromURL(url, outputFile);
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System.out.println("Done");
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System.exit(0);
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} catch (Throwable e) {
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System.out.println("- Error downloading");
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e.printStackTrace();
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System.exit(1);
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}
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}
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private static void downloadFileFromURL(String urlString, File destination) throws Exception {
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URL website = new URL(urlString);
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ReadableByteChannel rbc;
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rbc = Channels.newChannel(website.openStream());
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FileOutputStream fos = new FileOutputStream(destination);
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fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
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fos.close();
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rbc.close();
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}
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}

‎springboot-seata/sbm-account-service/.mvn/wrapper/maven-wrapper.jar‎

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‎springboot-seata/sbm-account-service/.mvn/wrapper/maven-wrapper.properties‎

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distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.0/apache-maven-3.6.0-bin.zip

‎springboot-seata/sbm-account-service/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.1.10.RELEASE</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.gf</groupId>
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<artifactId>sbm-account-service</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>sbm-account-service</name>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>io.seata</groupId>
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<artifactId>seata-spring-boot-starter</artifactId>
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<version>1.0.0</version>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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</dependency>
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<dependency>
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<groupId>org.mybatis.spring.boot</groupId>
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<artifactId>mybatis-spring-boot-starter</artifactId>
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<version>2.1.0</version>
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</dependency>
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<scope>runtime</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎springboot-seata/sbm-account-service/src/main/java/com/gf/SbmAccountServiceApplication.java‎

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package com.gf;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
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import org.springframework.context.annotation.Bean;
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import org.springframework.web.client.RestTemplate;
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@SpringBootApplication(scanBasePackages = "com.gf", exclude = DataSourceAutoConfiguration.class)
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public class SbmAccountServiceApplication {
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public static void main(String[] args) {
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SpringApplication.run(SbmAccountServiceApplication.class, args);
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}
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@Bean
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public RestTemplate restTemplate() {
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RestTemplate restTemplate = new RestTemplate();
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return restTemplate;
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}
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}

‎springboot-seata/sbm-account-service/src/main/java/com/gf/config/DataSourceConfig.java‎

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package com.gf.config;
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import com.alibaba.druid.pool.DruidDataSource;
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import org.springframework.boot.context.properties.ConfigurationProperties;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import javax.sql.DataSource;
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@Configuration
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public class DataSourceConfig {
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@Bean
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@ConfigurationProperties(prefix = "spring.datasource")
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public DataSource druidDataSource() {
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DruidDataSource druidDataSource = new DruidDataSource();
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return druidDataSource;
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}
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}

‎springboot-seata/sbm-account-service/src/main/java/com/gf/config/SeataRestTemplateAutoConfiguration.java‎

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package com.gf.config;
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import com.gf.interceptor.SeataRestTemplateInterceptor;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.http.client.ClientHttpRequestInterceptor;
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import org.springframework.web.client.RestTemplate;
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import javax.annotation.PostConstruct;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Iterator;
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import java.util.List;
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@Configuration
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public class SeataRestTemplateAutoConfiguration {
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@Autowired(
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required = false
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)
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private Collection<RestTemplate> restTemplates;
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@Autowired
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private SeataRestTemplateInterceptor seataRestTemplateInterceptor;
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public SeataRestTemplateAutoConfiguration() {
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}
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@Bean
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public SeataRestTemplateInterceptor seataRestTemplateInterceptor() {
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return new SeataRestTemplateInterceptor();
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}
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@PostConstruct
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public void init() {
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if (this.restTemplates != null) {
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Iterator var1 = this.restTemplates.iterator();
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while (var1.hasNext()) {
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RestTemplate restTemplate = (RestTemplate) var1.next();
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List<ClientHttpRequestInterceptor> interceptors = new ArrayList(restTemplate.getInterceptors());
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interceptors.add(this.seataRestTemplateInterceptor);
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restTemplate.setInterceptors(interceptors);
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}
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}
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}
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}

‎springboot-seata/sbm-account-service/src/main/java/com/gf/controller/AccountController.java‎

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package com.gf.controller;
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import com.gf.service.AccountService;
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import io.seata.core.context.RootContext;
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import lombok.RequiredArgsConstructor;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestParam;
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import org.springframework.web.bind.annotation.RestController;
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import java.math.BigDecimal;
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@RestController
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@RequiredArgsConstructor(onConstructor_={@Autowired})
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public class AccountController {
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private final AccountService accountService;
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@GetMapping
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public void debit(@RequestParam String userId , @RequestParam BigDecimal orderMoney) {
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System.out.println("account XID " + RootContext.getXID());
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accountService.debit(userId , orderMoney);
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}
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}

‎springboot-seata/sbm-account-service/src/main/java/com/gf/entity/Account.java‎

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package com.gf.entity;
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import lombok.*;
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import java.math.BigDecimal;
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@Getter
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@Setter
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@ToString
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@AllArgsConstructor
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@NoArgsConstructor
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public class Account {
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private Integer id;
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private String userId;
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private BigDecimal money;
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}

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