下面是详细的关于Spring Boot日志配置的攻略。
Spring Boot 日志配置
Spring Boot提供了多种日志框架的支持,如Logback、Log4j2、java.util.logging等。通过配置Spring Boot的日志框架,我们可以更好地进行日志管理和调试工作。
在Spring Boot中,日志配置可以通过在application.properties或application.yml文件中定义来实现。下面介绍指导步骤和示例进行详细讲解。
步骤
- 引入所需的日志框架依赖。例如,如果要使用Logback框架,可以在pom.xml中添加如下依赖:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logback</artifactId>
</dependency>
-
配置日志输出的位置和格式。可以通过application.properties或application.yml文件中的如下配置进行实现:
-
application.properties
# 设置日志的输出级别
logging.level.root=info
# 设置日志输出的位置
logging.file=/var/log/myapp/myapp.log
# 设置日志格式为json
logging.pattern.console: {"timestamp":"%d{ISO8601}","status":"%level","thread":"[%thread]","logger":"%logger{50}","message":"%msg%n"}
- application.yml
# 设置日志的输出级别
logging:
level:
root: info
# 设置日志输出的位置
file: /var/log/myapp/myapp.log
# 设置日志格式为json
pattern:
console: '{"timestamp":"%d{ISO8601}","status":"%level","thread":"[%thread]","logger":"%logger{50}","message":"%msg%n"}'
- 测试日志输出。比如我们可以在Spring Boot应用中添加如下代码来测试日志输出:
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Controller
public class MyController {
private static final Logger logger = LoggerFactory.getLogger(MyController.class);
@GetMapping("/")
public String index() {
logger.info("Hello World");
return "index";
}
}
示例
下面我们通过两个示例来进一步说明如何配置和使用Spring Boot的日志框架。
- 使用Logback框架输出日志到文件中
首先,在pom.xml中添加如下依赖:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logback</artifactId>
</dependency>
然后,在application.properties或application.yml文件中添加如下配置:
- application.properties
# 设置日志的输出级别
logging.level.root=info
# 设置日志输出的位置
logging.file=/var/log/myapp/myapp.log
- application.yml
# 设置日志的输出级别
logging:
level:
root: info
# 设置日志输出的位置
file: /var/log/myapp/myapp.log
接着,在Controller中添加如下代码来测试日志输出:
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Controller
public class MyController {
private static final Logger logger = LoggerFactory.getLogger(MyController.class);
@GetMapping("/")
public String index() {
logger.info("Hello World");
return "index";
}
}
运行应用后,我们可以在/var/log/myapp/myapp.log文件中看到如下日志输出:
2019-12-10 10:21:04.012 INFO 18842 --- [nio-8080-exec-1] com.example.demo.MyController : Hello World
- 使用Log4j2框架输出JSON格式的日志
首先,在pom.xml中添加如下依赖:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
然后,在application.properties或application.yml文件中添加如下配置:
- application.properties
# 设置日志的输出级别
logging.level.root=info
# 设置日志输出的位置
logging.file=/var/log/myapp/myapp.log
# 设置日志格式为json
logging.pattern.console: {"timestamp":"%d{ISO8601}","status":"%level","thread":"[%thread]","logger":"%logger{50}","message":"%msg%n"}
- application.yml
# 设置日志的输出级别
logging:
level:
root: info
# 设置日志输出的位置
file: /var/log/myapp/myapp.log
# 设置日志格式为json
pattern:
console: '{"timestamp":"%d{ISO8601}","status":"%level","thread":"[%thread]","logger":"%logger{50}","message":"%msg%n"}'
接着,在Controller中添加如下代码来测试日志输出:
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Controller
public class MyController {
private static final Logger logger = LoggerFactory.getLogger(MyController.class);
@GetMapping("/")
public String index() {
logger.info("Hello World");
return "index";
}
}
运行应用后,我们可以在控制台看到如下输出:
{"timestamp":"2019-12-10T10:30:30.297+0800","status":"INFO","thread":"[nio-8080-exec-1]","logger":"com.example.demo.MyController","message":"Hello World\n"}
以上就是Spring Boot日志配置的详细攻略,希望对您有所帮助。
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