以下是SpringBoot项目中的常用配置类、jar包坐标等通用配置
<!-- --> <!-- 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>
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"));
}
};
}
}
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
