SpringBoot使用log4j2
在Spring Boot中所有的starter 都是基于spring-boot-starter-logging的，默认使用Logback。使用Log4j2的话，你需要排除 spring-boot-starter-logging 的依赖，并添加 spring-boot-starter-log4j2的依赖。
配置依赖
<!-- 自定义验证注解 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
OpenFeign日志配置
feign的配置类
public class BaseFeignConfig {
@Bean
Logger.Level feignLoggerLevel() {
return Logger.Level.FULL;
}
}
单个服务应用配置类
@FeignClient(value = "crm-base",configuration = BaseFeignConfig.class )
public interface BaseFeign {
@GetMapping("/getAppInfo")
ResponseEx<Object> getAppInfo(@RequestParam(name = "appId") Integer appId);
}
日志级别配置
logging.level.com.charles.feign.BaseFeign=debug
打印效果
23-04-18 15:01:04 DEBUG http-nio-8080-exec-1 crm-emergency traceId- userId- com.linjiu.feign.BaseFeign.log:72:[BaseFeign#getAppInfo] ---> GET http://crm-base/getAppInfo?appId=-1 HTTP/1.1
2023-04-18 15:01:04 DEBUG http-nio-8080-exec-1 crm-emergency traceId- userId- com.linjiu.feign.BaseFeign.log:72:[BaseFeign#getAppInfo] ---> END HTTP (0-byte body)
2023-04-18 15:02:37 DEBUG http-nio-8080-exec-3 crm-emergency traceId- userId- com.linjiu.feign.BaseFeign.log:72:[BaseFeign#getAppInfo] ---> END HTTP (0-byte body)
2023-04-18 15:02:38 DEBUG http-nio-8080-exec-3 crm-emergency traceId- userId- com.linjiu.feign.BaseFeign.log:72:[BaseFeign#getAppInfo] <--- HTTP/1.1 200 (205ms)
2023-04-18 15:02:38 DEBUG http-nio-8080-exec-3 crm-emergency traceId- userId- com.linjiu.feign.BaseFeign.log:72:[BaseFeign#getAppInfo] connection: keep-alive
2023-04-18 15:02:38 DEBUG http-nio-8080-exec-3 crm-emergency traceId- userId- com.linjiu.feign.BaseFeign.log:72:[BaseFeign#getAppInfo] content-type: application/json
2023-04-18 15:02:38 DEBUG http-nio-8080-exec-3 crm-emergency traceId- userId- com.linjiu.feign.BaseFeign.log:72:[BaseFeign#getAppInfo] date: Tue, 18 Apr 2023 07:02:38 GMT
2023-04-18 15:02:38 DEBUG http-nio-8080-exec-3 crm-emergency traceId- userId- com.linjiu.feign.BaseFeign.log:72:[BaseFeign#getAppInfo] keep-alive: timeout=60
2023-04-18 15:02:38 DEBUG http-nio-8080-exec-3 crm-emergency traceId- userId- com.linjiu.feign.BaseFeign.log:72:[BaseFeign#getAppInfo] transfer-encoding: chunked
2023-04-18 15:02:38 DEBUG http-nio-8080-exec-3 crm-emergency traceId- userId- com.linjiu.feign.BaseFeign.log:72:[BaseFeign#getAppInfo]
2023-04-18 15:02:38 DEBUG http-nio-8080-exec-3 crm-emergency traceId- userId- com.linjiu.feign.BaseFeign.log:72:[BaseFeign#getAppInfo] {"data":[{ ...
源码解析
SynchronousMethodHandler#executeAndDecode，发送请求。如果日志级别不是Logger.Level.NONE，打印日志。
Object executeAndDecode(RequestTemplate template, Options options) throws Throwable {
Request request = targetRequest(template);
if (logLevel != Logger.Level.NONE) {
logger.logRequest(metadata.configKey(), logLevel, request);
}
Response response;
long start = System.nanoTime();
try {
response = client.execute(request, options);
// ensure the request is set. TODO: remove in Feign 12
response = response.toBuilder()
.request(request)
.requestTemplate(template)
.build();
} catch (IOException e) {
if (logLevel != Logger.Level.NONE) {
logger.logIOException(metadata.configKey(), logLevel, e, elapsedTime(start));
}
throw errorExecuting(request, e);
}
long elapsedTime = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - start);
if (decoder != null)
return decoder.decode(response, metadata.returnType());
CompletableFuture<Object> resultFuture = new CompletableFuture<>();
asyncResponseHandler.handleResponse(resultFuture, metadata.configKey(), response,
metadata.returnType(),
elapsedTime);
try {
if (!resultFuture.isDone())
throw new IllegalStateException("Response handling not done");
return resultFuture.join();
} catch (CompletionException e) {
Throwable cause = e.getCause();
if (cause != null)
throw cause;
throw e;
}
}
Slf4jLogger#logRequest，判断是否允许debug日志输出
protected void logRequest(String configKey, Level logLevel, Request request) {
if (this.logger.isDebugEnabled()) {
super.logRequest(configKey, logLevel, request);
}
}
Logger#logRequest，打印具体的请求日志。
protected void logRequest(String configKey, Level logLevel, Request request) {
log(configKey, "---> %s %s HTTP/1.1", request.httpMethod().name(), request.url());
if (logLevel.ordinal() >= Level.HEADERS.ordinal()) {
for (String field : request.headers().keySet()) {
for (String value : valuesOrEmpty(request.headers(), field)) {
log(configKey, "%s: %s", field, value);
}
}
int bodyLength = 0;
if (request.body() != null) {
bodyLength = request.length();
if (logLevel.ordinal() >= Level.FULL.ordinal()) {
String bodyText =
request.charset() != null
? new String(request.body(), request.charset())
: null;
log(configKey, ""); // CRLF
log(configKey, "%s", bodyText != null ? bodyText : "Binary data");
}
}
log(configKey, "---> END HTTP (%s-byte body)", bodyLength);
}
}
AsyncResponseHandler#handleResponse，处理响应。打印日志用的是logger.logAndRebufferResponse
void handleResponse(CompletableFuture<Object> resultFuture,
String configKey,
Response response,
Type returnType,
long elapsedTime) {
// copied fairly liberally from SynchronousMethodHandler
boolean shouldClose = true;
try {
if (logLevel != Level.NONE) {
response = logger.logAndRebufferResponse(configKey, logLevel, response,
elapsedTime);
}
} catch (final Exception e) {
resultFuture.completeExceptionally(e);
}
}
Logger实体类创建，FeignClientFactoryBean#feign创建Feign。
protected Builder feign(FeignContext context) {
FeignLoggerFactory loggerFactory = (FeignLoggerFactory)this.get(context, FeignLoggerFactory.class);
Logger logger = loggerFactory.create(this.type);
Builder builder = ((Builder)this.get(context, Builder.class)).logger(logger).encoder((Encoder)this.get(context, Encoder.class)).decoder((Decoder)this.get(context, Decoder.class)).contract((Contract)this.get(context, Contract.class));
this.configureFeign(context, builder);
return builder;
}
DefaultFeignLoggerFactory#create，创建日志类。
public Logger create(Class<?> type) {
return (Logger)(this.logger != null ? this.logger : new Slf4jLogger(type));
}
使用slf4j进行创建，类型是com.linjiu.feign.BaseFeign。这也解释了需要配置logging.level.com.charles.feign.BaseFeign=debug才能输出日志。有时间专门来一篇博客，看看slf4j日志的生效逻辑和Springboot日志生效的逻辑。
public Slf4jLogger(Class<?> clazz) {
this(LoggerFactory.getLogger(clazz));
}
