这是我如何使用SLF4J使云日志记录工作。这适用于不兼容的Java GAE Flex环境。
logback.xml
<configuration debug="true"> <appender name="FILE" > <file>/var/log/app_engine/custom_logs/app.log.json</file> <append>true</append> <!-- enprers are assigned the type ch.qos.logback.classic.enprer.PatternLayoutEnprer by default --> <enprer > <layout > <pattern>%-4relative [%thread] %-5level %logger{35} - %msg</pattern> </layout> </enprer> </appender> <root level="DEBUG"> <appender-ref ref="FILE" /> </root></configuration>这是我用来在日志文件中的一行上生成JSON的PatternLayout类。
import static ch.qos.logback.classic.Level.DEBUG_INT;import static ch.qos.logback.classic.Level.ERROR_INT;import static ch.qos.logback.classic.Level.INFO_INT;import static ch.qos.logback.classic.Level.TRACE_INT;import static ch.qos.logback.classic.Level.WARN_INT;import java.util.Map;import org.json.JSONObject;import com.homedepot.ta.wh.common.logging.GCPCloudLoggingJSONLayout.GCPCloudLoggingEvent.GCPCloudLoggingTimestamp;import ch.qos.logback.classic.Level;import ch.qos.logback.classic.PatternLayout;import ch.qos.logback.classic.spi.ILoggingEvent;public class GCPCloudLoggingJSonLayout extends PatternLayout { @Override public String doLayout(ILoggingEvent event) { String formattedMessage = super.doLayout(event); return doLayout_internal(formattedMessage, event); } String doLayout_internal(String formattedMessage, ILoggingEvent event) { GCPCloudLoggingEvent gcpLogEvent = new GCPCloudLoggingEvent(formattedMessage , convertTimestampToGCPLogTimestamp(event.getTimeStamp()) , mapLevelToGCPLevel(event.getLevel()) , null); JSonObject jsonObj = new JSonObject(gcpLogEvent); return jsonObj.toString() + "n"; } static GCPCloudLoggingTimestamp convertTimestampToGCPLogTimestamp(long millisSinceEpoch) { int nanos = ((int) (millisSinceEpoch % 1000)) * 1_000_000; // strip out just the milliseconds and convert to nanoseconds long seconds = millisSinceEpoch / 1000L; // remove the milliseconds return new GCPCloudLoggingTimestamp(seconds, nanos); } static String mapLevelToGCPLevel(Level level) { switch (level.toInt()) { case TRACE_INT: return "TRACE"; case DEBUG_INT: return "DEBUG"; case INFO_INT: return "INFO"; case WARN_INT: return "WARN"; case ERROR_INT: return "ERROR"; default: return null; } } public static class GCPCloudLoggingEvent { private String message; private GCPCloudLoggingTimestamp timestamp; private String traceId; private String severity; public GCPCloudLoggingEvent(String message, GCPCloudLoggingTimestamp timestamp, String severity, String traceId) { super(); this.message = message; this.timestamp = timestamp; this.traceId = traceId; this.severity = severity; } public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } public GCPCloudLoggingTimestamp getTimestamp() { return timestamp; } public void setTimestamp(GCPCloudLoggingTimestamp timestamp) { this.timestamp = timestamp; } public String getTraceId() { return traceId; } public void setTraceId(String traceId) { this.traceId = traceId; } public String getSeverity() { return severity; } public void setSeverity(String severity) { this.severity = severity; } public static class GCPCloudLoggingTimestamp { private long seconds; private int nanos; public GCPCloudLoggingTimestamp(long seconds, int nanos) { super(); this.seconds = seconds; this.nanos = nanos; } public long getSeconds() { return seconds; } public void setSeconds(long seconds) { this.seconds = seconds; } public int getNanos() { return nanos; } public void setNanos(int nanos) { this.nanos = nanos; } }} @Override public Map<String, String> getDefaultConverterMap() { return PatternLayout.defaultConverterMap; } }
