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 * 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 *

@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 * 代码不用改

来源：https://blog.csdn.net/weixin_45481406/article/details/114441230