详解SpringBoot通用配置文件(不定时更新)

  以下是SpringBoot项目中的常用配置类、jar包坐标等通用配置

pom文件

	<!-- -->
		<!-- 自定义配置文件提示 -->
		<dependency>
		 <groupId>org.springframework.boot</groupId>
		 <artifactId>spring-boot-configuration-processor</artifactId>
		 <optional>true</optional>
		</dependency>
		<!-- Redis启动器 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-redis</artifactId>
		</dependency>
 <!-- SpringSession解决session共享问题-->
 <dependency>
  <groupId>org.springframework.session</groupId>
  <artifactId>spring-session-data-redis</artifactId>
 </dependency>
		<!-- RabbitMQ启动器 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-amqp</artifactId>
		</dependency>
		<!-- 热部署启动器 -->
 <dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-devtools</artifactId>
  <optional>true</optional>
 </dependency>
		<!-- thymeleaf模板引擎 -->
 <dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-thymeleaf</artifactId>
 </dependency>
 <!-- hutool工具包 -->
		<dependency>
  <groupId>cn.hutool</groupId>
  <artifactId>hutool-all</artifactId>
  <version>5.5.9</version>
 </dependency>
 <!-- 阿里巴巴Fastjson工具包 -->
 <dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>fastjson</artifactId>
  <version>1.2.75</version>
 </dependency>
 <!-- 注解校验启动器 -->
 <dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-validation</artifactId>
 </dependency>
 <!-- mybatis启动器 -->
		<dependency>
		 <groupId>org.mybatis.spring.boot</groupId>
		 <artifactId>mybatis-spring-boot-starter</artifactId>
		 <version>2.1.4</version>
		</dependency>
 <!-- mybatis-plus启动器 -->
 <dependency>
  <groupId>com.baomidou</groupId>
  <artifactId>mybatis-plus-boot-starter</artifactId>
  <version>3.4.2</version>
 </dependency>
 <!-- MySQL驱动包 -->
 <dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>8.0.23</version>
 </dependency>
 <!-- Nacos 服务注册发现 -->
 <dependency>
  <groupId>com.alibaba.cloud</groupId>
  <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
 </dependency>
 <!-- nacos 配置中心 -->
 <dependency>
  <groupId>com.alibaba.cloud</groupId>
  <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
 </dependency>

常用配置类

Feign远程调用拦截器配置

@Configuration
public class FeignConfig {
 @Bean
 public RequestInterceptor requestInterceptor() {
 return new RequestInterceptor() {
  /**
  * 调用远程方法之前先调用此方法
  */
  @Override
  public void apply(RequestTemplate requestTemplate) {
  //Spring提供的工具,获取当前请求的属性,
  ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
  //获取当前请求对象
  HttpServletRequest request = requestAttributes.getRequest();
  //同步请求头信息
  requestTemplate.header("Cookie", request.getHeader("Cookie"));
  }
 };
 }
}

 常用方法

分布式中进行线程数据共享-----ThreadLocal
  例如：在分布式服务中，进行登录后怎样将当前登录的用户在当前微服务中，可以通过ThreadLocal类型进行共享

// 示例，前后端分离环境
/**
 * 在连接器中进行拦截验证
 */
public class MyInterceptor implements HandlerInterceptor{
	public static ThreadLocal<User> loginUser = new ThreadLocal<>();
	 @Override
 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		// 获取系统颁发的token
		String token = request.getHeader("token");
		// TODO 在认证服务中心通过token去认证当前是否有账户登录及其登录的状态
		User user = feign.validUser(token);
		//将用户信息保存到本地线程中
		loginUser.set(user);
	}
}

/**
 * 测试demo
 */
public class TestDemo{
	public void test(){
		// 从本地线程中获取保存的变量
		User user = MyInterceptor.loginUser.get();
		// TODO 使用user进行业务
	}
}

Feign同步调用时丢失请求头信息—添加拦截器

@Configuration
public class FeignConfig {
 @Bean
 public RequestInterceptor requestInterceptor() {
 return new RequestInterceptor() {
  /**
  * 调用远程方法之前先调用此方法
  */
  @Override
  public void apply(RequestTemplate requestTemplate) {
  //Spring提供的工具,获取当前请求的属性,
  ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
  //获取当前请求对象
  HttpServletRequest request = requestAttributes.getRequest();
  //同步请求头信息
  requestTemplate.header("Cookie", request.getHeader("Cookie"));
  }
 };
 }
}

Feign异步调用时丢失上下文

public void testDemo() throws ExecutionException, InterruptedException {
 // 主线程请求的上下文信息
 RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
 CompletableFuture<Void> task1 = CompletableFuture.runAsync(() -> {
 //设置上下文信息
 RequestContextHolder.setRequestAttributes(requestAttributes);
 //TODO 执行远程调用
 }, executor);
 CompletableFuture<Void> task2 = CompletableFuture.runAsync(() -> {
 //设置上下文信息
 RequestContextHolder.setRequestAttributes(requestAttributes);
 //TODO 执行远程调用
 }, executor);
 CompletableFuture.allOf(task1, task2).get();
}

// TODO feign的拦截器代码不用改

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