Java 使用自定义rollingFileAppender和自定义JsonLayout记录异常stacktrace

我已经编写了一个自定义记录器，它有自己的滚动文件追加器。我使用其中一条日志消息（例如，info（）、debug（）等）记录异常，我不希望它打印异常的整个堆栈跟踪，但它只打印消息

public class Logger {

    private static ConcurrentHashMap<String, Logger> loggerMap = new ConcurrentHashMap<String, Logger>();
    private static ConcurrentHashMap<String, FileAppender> appenderMap = new ConcurrentHashMap<String, FileAppender>();
    private static LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();

    public static org.slf4j.Logger getLoggerWithRollingFileAppender(String appenderName,
                                                              String loggerName,
                                                              Level logLevel) {

        RollingFileAppender rollingFileAppender;

        // Check if the appender is already created.
        if (! appenderMap.containsKey(appenderName)) {
            LayoutWrappingEncoder jsonEncoder = new LayoutWrappingEncoder();
            JsonFormatter jsonFormatter = new JacksonJsonFormatter();
            ((JacksonJsonFormatter) jsonFormatter).setPrettyPrint(false);
            JsonLayout jsonLayout = new JsonLayout();
            jsonLayout.setJsonFormatter(jsonFormatter);
            jsonLayout.setTimestampFormat("yyyy-MM-dd HH:mm:ss.SSS");
            jsonLayout.setContext(loggerContext);
            jsonLayout.setAppendLineSeparator(true);
            jsonLayout.setIncludeException(true);
            jsonLayout.setIncludeMDC(true);
            jsonEncoder.setLayout(jsonLayout);
            jsonEncoder.setContext(loggerContext);
            jsonEncoder.start();

            rollingFileAppender = new RollingFileAppender();
            rollingFileAppender.setContext(loggerContext);
            rollingFileAppender.setName(appenderName);
            rollingFileAppender.setEncoder(jsonEncoder);
            rollingFileAppender.setAppend(true);

            SizeAndTimeBasedRollingPolicy sizeAndTimeBasedRollingPolicy =
                    new SizeAndTimeBasedRollingPolicy();
            sizeAndTimeBasedRollingPolicy.setContext(loggerContext);
            sizeAndTimeBasedRollingPolicy.setParent(rollingFileAppender);
            sizeAndTimeBasedRollingPolicy.setFileNamePattern(logBaseDir +
                    File.separator +
                    appenderName + "-" +
                    applnName + "-%d{yyyy-MM-dd}.%i.log");
            sizeAndTimeBasedRollingPolicy.setMaxHistory(maxLogHistory);
            sizeAndTimeBasedRollingPolicy.setMaxFileSize(FileSize.valueOf(maxLogFileSize));
            sizeAndTimeBasedRollingPolicy.setTotalSizeCap(FileSize.valueOf(totalLogSizeCap));
            sizeAndTimeBasedRollingPolicy.start();
            rollingFileAppender.setRollingPolicy(sizeAndTimeBasedRollingPolicy);
            rollingFileAppender.start();
            appenderMap.put(appenderName, rollingFileAppender);
        } else {
            rollingFileAppender = (RollingFileAppender) appenderMap.get(appenderName);
        }

        // Return the logger
        org.slf4j.Logger slf4jLogger = getLogger(loggerName);
        Logger logger = (ch.qos.logback.classic.Logger) slf4jLogger;
        logger.setAdditive(false);
        logger.setLevel(logLevel);
        logger.addAppender(rollingFileAppender);
        return slf4jLogger;
    } 
}

@Test
void testExceptionWithLoggerWithRollingFileAppender() {

    org.slf4j.Logger slf4jLogger = Logger.getLoggerWithRollingFileAppender
            ("testAppender",
             "com.test7",
             Level.DEBUG);
    try {
        FileInputStream fis=new FileInputStream("dummyfile.txt");
    } catch (FileNotFoundException e) {
        slf4jLogger.info("Exception is", e);
    }
    Logger logger = (ch.qos.logback.classic.Logger) slf4jLogger;
    logger.debug("This is a log message");
    try {
        FileInputStream fis=new FileInputStream("dummyfile.txt");
    } catch (FileNotFoundException e) {
        logger.info("Exception is", e);
    }
}

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查看源代码时，它使用一个

ThrowableProxyConverter

来控制JSON中的最终内容-因此，即使调用

setIncludeException

（as），它的功能将取决于选择了哪个转换器（没有花足够长的时间来了解如何使用）。您可能希望包含类似的内容。

我找到了解决方法。添加了CustomThrowableProxyConverter并通过它处理堆栈跟踪处理

public class CustomThrowableProxyConverter extends ThrowableHandlingConverter {

    public CustomThrowableProxyConverter() {
    }

    @Override
    public String convert(ILoggingEvent event) {
        StringBuilder sb = new StringBuilder();
        IThrowableProxy itp = event.getThrowableProxy();
        if (itp instanceof ThrowableProxy) {
            ThrowableProxy tp = (ThrowableProxy)itp;
            sb.append(tp.getClassName() + ": " + tp.getMessage());
            for (StackTraceElementProxy element : tp.getStackTraceElementProxyArray()) {
                sb.append("\t\n");
                sb.append(element.getSTEAsString());
            }
            return sb.toString();
        }

        return "";
    }
}

然后将其设置为jsonLayout实例

JsonLayout jsonLayout = new JsonLayout();
jsonLayout.setThrowableProxyConverter(new CustomThrowableProxyConverter());
jsonEncoder.setLayout(jsonLayout);

---

出于测试目的，我尝试了“HTMLLayout”和“XMLLayout”，它们显示了完整的堆栈跟踪。只有“JsonLayout”有这个问题。它就是这样写的——不管是不是bug，还是设计——代码中没有足够的内容来说明这一点。我在下面发布了一个答案。谢谢你的帮助！有时，仅异常的类/行就足以为您提供问题所在的充分线索（尽管在重试的情况下，根本原因也很有用）。。。在我的一个应用程序（已经使用了10多年）的日志中，完整的堆栈跟踪往往不会提供太多额外的信息。。。

JsonLayout jsonLayout = new JsonLayout();
jsonLayout.setThrowableProxyConverter(new CustomThrowableProxyConverter());
jsonEncoder.setLayout(jsonLayout);