Java ???? ?? ? ??? ?????? ??? ????? ???? ? ???? ?????. ??? ?? ?? ???? ?? ?? ???? ????? ???? ???? ???? ? ?? ????. Logback ? ??? ?? TestLogAppender? ?? SLF4J? ???? ?? ???? ?? ??? ???? ??? ????.

?? ??

?? ?? ? ??? ???? ?? ???? ?? ???? ???? ?? ???? ??? ?????.

1??: ??? ??? ??? ??

...
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-core</artifactId>
    <scope>test</scope>
</dependency>
...

2??: ??? ??

??? ???? ??? ???? ??? ???? ??? ????.

package com.example.loggingdemo;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SimpleService {
    private static final Logger logger = LoggerFactory.getLogger(SimpleService.class);

    public void performTask() {
        try {
            // Simulate some task that fails
            throw new IllegalArgumentException("Simulated exception");
        } catch (IllegalArgumentException e) {
            logger.error("An error occurred: {}", e.getMessage());
        }
    }
}

3??: ??? ?? TestLogAppender ???

? ???? ??? ?? ?? ???? ???? ?? ???? ?? ???? ??????.

package com.example.loggingdemo;

import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.AppenderBase;

public class TestLogAppender extends AppenderBase<ILoggingEvent> {
    private final StringBuilder logs = new StringBuilder();

    @Override
    protected void append(ILoggingEvent eventObject) {
        logs.append(eventObject.getFormattedMessage()).append("
");
    }

    public String getLogs() {
        return logs.toString();
    }
}

4??: ??? ??

?? ?? ??? ???? ???? ??? ?????.

package com.example.loggingdemo;

import static org.assertj.core.api.Assertions.assertThat;

import ch.qos.logback.classic.Logger;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.slf4j.LoggerFactory;

public class SimpleServiceTest {
    private TestLogAppender logAppender;
    private SimpleService simpleService;

    @BeforeEach
    public void setup() {
        // Attach TestLogAppender to the logger
        logAppender = new TestLogAppender();
        logAppender.start();
        Logger logger = (Logger) LoggerFactory.getLogger(SimpleService.class);
        logger.addAppender(logAppender);

        // Initialize the service
        simpleService = new SimpleService();
    }

    @Test
    public void testPerformTaskLogsError() {
        // Act
        simpleService.performTask();

        // Assert
        String logs = logAppender.getLogs();
        assertThat(logs).contains("An error occurred: Simulated exception");
    }
}

??
?? ???? ???? ?? ?? ???!

5??: ??? ??

? ???? ???? ??? ??? ? SimpleService? ??? ?? ???? ????? ??? ? ????.

?? ??

• Custom Appender: TestLogAppender? Logback AppenderBase? ?? ??? ????? ?? ???? ?????.
• ?? ??: ??? ?? ??? ?? ???? ?? ??? ???? ?????.
• ??? ?? ??: ????? ??? ?? ??? ??? ???? ?? ???? ??? ?????.

??

? ?? ??? ???? ?? ??? ???? ????? ??????? ??? ???? ??? ???? ????? ??? ? ????. ? ??? ????? ?? ?? ??? ?? ??? ??? ?? ? ??? ????? ??? ? ????.

? ??? ???? ??? ?? ??? ????? ??? ???!

??? ?????!

? ??? SLFand Logback? ???? Java?? ?? ?? ? ???: ??? ???? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!