如何在java日志中打印自定义stacktrace？

Question

当前logback.xml

<appender name="FILEOUT3" class="ch.qos.logback.core.FileAppender">
    <file>D:/${byDay}.log</file>
    <append>true</append>
    <encoder>
        <Pattern>%d{HH:mm:ss} %-5level %msg%replace(%xException){"\n", ">> "}%nopex%n</Pattern>
    </encoder>
</appender>

当前结果：

play.api.Configuration$$anon$1: Configuration error[Cannot connect to database [default]]
>> at play.api.Configuration$.play$api$Configuration$$configError(Configuration.scala:92) ~[play_2.10-2.2.0.jar:2.2.0]
>> at play.api.Configuration.reportError(Configuration.scala:570) ~[play_2.10-2.2.0.jar:2.2.0]
>> at play.api.db.BoneCPPlugin$$anonfun$onStart$1.apply(DB.scala:252) ~[play-jdbc_2.10-2.2.0.jar:2.2.0]

我想要结果：

[12:43:16.454] play.api.Configuration$$anon$1: Configuration error[Cannot connect to database [default]]
[12:43:16.454]    at play.api.Configuration$.play$api$Configuration$$configError(Configuration.scala:92) ~[play_2.10-2.2.0.jar:2.2.0]
[12:43:16.454]    at play.api.Configuration.reportError(Configuration.scala:570) ~[play_2.10-2.2.0.jar:2.2.0]
[12:43:16.454]    at play.api.db.BoneCPPlugin$$anonfun$onStart$1.apply(DB.scala:252) ~[play-jdbc_2.10-2.2.0.jar:2.2.0]
:
:
more 40 lines
:
[12:43:16.454]    at play.api.db.BoneCPPlugin$$anonfun$onStart$1.apply(DB.scala:252) ~[play-jdbc_2.10-2.2.0.jar:2.2.0]

Answer 1

您不能仅通过更改logback.xml来实现这一点，因为由%replace调用的ReplacingCompositeConverter仅使用静态字符串作为替换（没有日期或PatternLayout的任何其他转换字）。

为了达到您的目标，您应该创建自定义转换器（如果您要使用我的转换器，请注意它应该放在ch.qos.logback.core.pattern包中）

package ch.qos.logback.core.pattern;

import ch.qos.logback.classic.PatternLayout;

import ch.qos.logback.core.pattern.parser.Node;
import ch.qos.logback.core.pattern.parser.Parser;
import ch.qos.logback.core.spi.ScanException;

public class ReplacingAndParsingCompositeConverter<E> extends ReplacingCompositeConverter<E> {

    @Override
    protected String transform(E event, String in) {
        if (!started) {
            return in;
        }

        String parsedReplacement;

        try {
            Parser<E> p = new Parser<E>(replacement);
            p.setContext(getContext());
            Node t = p.parse();
            Converter<E> c = p.compile(t, PatternLayout.defaultConverterMap);
            ConverterUtil.setContextForConverters(getContext(), c);
            ConverterUtil.startConverters(c);
            StringBuilder buf = new StringBuilder();
            while (c != null) {
                c.write(buf, event);
                c = c.getNext();
            }
            parsedReplacement = buf.toString();
        } catch (ScanException e) {
            e.printStackTrace();
            parsedReplacement = replacement;
        }
        return pattern.matcher(in).replaceAll(parsedReplacement);
    }
}

然后您应该在logback.xml中使用 声明这个转换器，并使用它而不是旧的%replace。

<configuration ...>
    <conversionRule conversionWord="replaceAndParse" converterClass="ch.qos.logback.core.pattern.ReplacingAndParsingCompositeConverter" />

    <appender name="FILEOUT3" class="ch.qos.logback.core.FileAppender">
        <file>D:/${byDay}.log</file>
        <append>true</append>
        <encoder>
            <Pattern>[%d{HH:mm:ss.SSS}] %-5level %msg%replaceAndParse(%xException){"(\r?\n)", "$1[%d{HH:mm:ss.SSS}]"}%nopex%n</Pattern>
        </encoder>
    </appender>
    ....
</configuration>