Java：如何将原始 JSON 记录为 JSON 并避免在使用 logback slf4j 记录期间转义

Java：如何将原始 JSON 记录为 JSON 并避免在使用 logback / slf4j 记录期间转义

java
import ch.qos.logback.classic.PatternLayout;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.pattern.Converter;
import ch.qos.logback.core.pattern.ConverterUtil;
import ch.qos.logback.core.pattern.PostCompileProcessor;
import java.util.ArrayList;
import java.util.List;
public class JsonPatternLayout extends PatternLayout {
    @Override
    public String doLayout(ILoggingEvent event) {
        String pattern = getPattern();
        if (pattern == null) {
            return CoreConstants.EMPTY_STRING;
        }
        StringBuilder sbuf = new StringBuilder(128);
        List> converters = parse();
        ConverterUtil.startConverters(converters, sbuf, event);
        String message = event.getFormattedMessage();
        if (message.startsWith("{") && message.endsWith("}")) {
            // 如果日志消息是以"{"开头和"}"结尾的，说明是JSON数据
            sbuf.append(message);
        } else {
            // 否则，按照原来的模式输出
            sbuf.append(event.getFormattedMessage());
        }
        ConverterUtil.endConverters(converters, sbuf);
        if (postCompileProcessor != null) {
            postCompileProcessor.process(event, sbuf);
        }
        return sbuf.toString();
    }
}
public class JsonPatternLayoutPostCompileProcessor implements PostCompileProcessor {
    @Override
    public void process(ILoggingEvent event, StringBuilder output) {
        List placeholders = findPlaceholders(output);
        for (String placeholder : placeholders) {
            String value = event.getMDCPropertyMap().get(placeholder);
            if (value != null) {
                output.replace(output.indexOf("${" + placeholder + "}"), output.indexOf("}", output.indexOf("${" + placeholder + "}")) + 1, value);
            }
        }
    }
    private List findPlaceholders(CharSequence s) {
        List placeholders = new ArrayList<>();
        int index = 0;
        while ((index = s.indexOf("${", index)) != -1) {
            int endIndex = s.indexOf("}", index);
            if (endIndex != -1) {
                placeholders.add(s.subSequence(index + 2, endIndex).toString());
                index = endIndex + 1;
            } else {
                break;
            }
        }
        return placeholders;
    }
}

xml
    
        
            %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg