SpringBoot通用組態檔----不定時更新

??以下是SpringBoot專案中的常用配置類、jar包坐標等通用配置

pom檔案

		<!--  -->
		<!-- 自定義組態檔提示 -->
		<dependency>
		    <groupId>org.springframework.boot</groupId>
		    <artifactId>spring-boot-configuration-processor</artifactId>
		    <optional>true</optional>
		</dependency>
		<!-- Redis啟動器 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-redis</artifactId>
		</dependency>
        <!-- SpringSession解決session共享問題-->
        <dependency>
            <groupId>org.springframework.session</groupId>
            <artifactId>spring-session-data-redis</artifactId>
        </dependency>
		<!-- RabbitMQ啟動器 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-amqp</artifactId>
		</dependency>
		<!-- 熱部署啟動器 -->
        <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>
        <!-- 注解校驗啟動器 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        <!-- mybatis啟動器 -->
		<dependency>
		    <groupId>org.mybatis.spring.boot</groupId>
		    <artifactId>mybatis-spring-boot-starter</artifactId>
		    <version>2.1.4</version>
		</dependency>
        <!-- mybatis-plus啟動器 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.2</version>
        </dependency>
        <!-- MySQL驅動包 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.23</version>
        </dependency>
        <!-- Nacos 服務注冊發現 -->
        <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>

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常用配置類

Feign遠程呼叫攔截器配置

@Configuration
public class FeignConfig {
    @Bean
    public RequestInterceptor requestInterceptor() {
        return new RequestInterceptor() {
            /**
             * 呼叫遠程方法之前先呼叫此方法
             */
            @Override
            public void apply(RequestTemplate requestTemplate) {
                //Spring提供的工具,獲取當前請求的屬性,
                ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
                //獲取當前請求物件
                HttpServletRequest request = requestAttributes.getRequest();
                //同步請求頭資訊
                requestTemplate.header("Cookie", request.getHeader("Cookie"));
            }
        };
    }
}

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常用方法

分布式中進行執行緒資料共享-----ThreadLocal
??例如：在分布式服務中，進行登錄后怎樣將當前登錄的用戶在當前微服務中，可以通過ThreadLocal型別進行共享

// 示例，前后端分離環境
/**
 * 在連接器中進行攔截驗證
 */
public class MyInterceptor implements HandlerInterceptor{
	public static ThreadLocal<User> loginUser = new ThreadLocal<>();
	 @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		// 獲取系統頒發的token
		String token = request.getHeader("token");
		// TODO 在認證服務中心通過token去認證當前是否有賬戶登錄及其登錄的狀態
		User user = feign.validUser(token);
		//將用戶資訊保存到本地執行緒中
		loginUser.set(user);
	}
}

/**
 * 測驗demo
 */
public class TestDemo{
	public void test(){
		// 從本地執行緒中獲取保存的變數
		User user = MyInterceptor.loginUser.get();
		// TODO 使用user進行業務
	}
}

Feign同步呼叫時丟失請求頭資訊—添加攔截器

@Configuration
public class FeignConfig {
    @Bean
    public RequestInterceptor requestInterceptor() {
        return new RequestInterceptor() {
            /**
             * 呼叫遠程方法之前先呼叫此方法
             */
            @Override
            public void apply(RequestTemplate requestTemplate) {
                //Spring提供的工具,獲取當前請求的屬性,
                ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
                //獲取當前請求物件
                HttpServletRequest request = requestAttributes.getRequest();
                //同步請求頭資訊
                requestTemplate.header("Cookie", request.getHeader("Cookie"));
            }
        };
    }
}

Feign異步呼叫時丟失背景關系

public void testDemo() throws ExecutionException, InterruptedException {
    // 主執行緒請求的背景關系資訊
    RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
    CompletableFuture<Void> task1 = CompletableFuture.runAsync(() -> {
        //設定背景關系資訊
        RequestContextHolder.setRequestAttributes(requestAttributes);
        //TODO 執行遠程呼叫
    }, executor);
    CompletableFuture<Void> task2 = CompletableFuture.runAsync(() -> {
        //設定背景關系資訊
        RequestContextHolder.setRequestAttributes(requestAttributes);
        //TODO 執行遠程呼叫
    }, executor);
    CompletableFuture.allOf(task1, task2).get();
}

// TODO feign的攔截器代碼不用改

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