SpringBoot常用拦截器之ClientHttpRequestInterceptor

ClientHttpRequestInterceptor是Spring框架中用于拦截HTTP请求和响应的一个重要组件。它可以用于日志记录、权限校验、请求内容修改等场景。

以下是一个简单的ClientHttpRequestInterceptor实现示例，用于记录请求的详细信息：

import org.springframework.http.HttpRequest;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;
 
import java.io.IOException;
 
public class LoggingInterceptor implements ClientHttpRequestInterceptor {
 
    @Override
    public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
        long startTime = System.currentTimeMillis();
        System.out.println("Start time: " + startTime + " URI: " + request.getURI());
 
        ClientHttpResponse response = execution.execute(request, body);
 
        long endTime = System.currentTimeMillis();
        System.out.println("End time: " + endTime + " Duration: " + (endTime - startTime));
 
        return response;
    }
}

在Spring Boot应用中注册拦截器：

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.web.client.RestTemplate;
 
import java.util.Collections;
 
@Configuration
public class AppConfig {
 
    @Bean
    public RestTemplate restTemplate(ClientHttpRequestInterceptor loggingInterceptor) {
        return new RestTemplate(Collections.singletonList(loggingInterceptor));
    }
 
    @Bean
    public ClientHttpRequestInterceptor loggingInterceptor() {
        return new LoggingInterceptor();
    }
}

这个配置类创建了一个RestTemplate实例，并注册了自定义的LoggingInterceptor。这样，所有通过这个RestTemplate发出的请求都会被LoggingInterceptor拦截，并且会在控制台输出请求的开始时间、结束时间和耗时。