In java, how to write logs to a specific file appender of log4j?

Question

If a log4j properties have multiple file appenders, then in Java how can I make sure that logs are written in a specific file.

log4j.rootLogger=INFO,out 

log4j.appender.SUCCESS_FILE=org.apache.log4j.FileAppender
log4j.appender.SUCCESS_FILE.File=${dd.log.dir}/success.log

log4j.appender.VALID_FILE=org.apache.log4j.FileAppender
log4j.appender.VALID_FILE.File=${dd.log.dir}/valid_error.log

log4j.appender.TEMP_FILE=org.apache.log4j.FileAppender
log4j.appender.TEMP_FILE.File=${dd.log.dir}/Temp_error.tmp_log

In Java class, what can I do to write some messages to, lets say, SUCCESS_FILE and some messages to TEMP_FILE

Logger log = Logger.getLogger(Test.class);
log.debug("This message should go to SUCCESS_FILE");
log.debug("This message should go to TEMP_FILE");

Answer 1

This might help:-

log4j.appender.successLog=org.apache.log4j.FileAppender
log4j.appender.successLog.File=${dd.log.dir}/success.log

log4j.appender.tempLog=org.apache.log4j.FileAppender
log4j.appender.tempLog.File=${dd.log.dir}/Temp_error.tmp_log

log4j.category.successLogger=INFO, successLog
log4j.additivity.successLogger=false

log4j.category.tempLogger=INFO, tempLog
log4j.additivity.tempLogger=false

Access them like:-

static final Logger successLog = Logger.getLogger("successLogger");
static final Logger tempLog = Logger.getLogger("tempLogger");

Answer 2

Using XML configuration like @Nio answered is:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">

    <appender name="successLog" class="org.apache.log4j.FileAppender">
        <param name="file" value="${dd.log.dir}/success.log" />
        <param name="append" value="false" />
        <param name="Threshold" value="INFO" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="[%p] %d %c %M - %m%n" />
        </layout>
    </appender>

    <appender name="tempLog" class="org.apache.log4j.FileAppender">
        <param name="file" value="${dd.log.dir}/Temp_error.tmp_log" />
        <param name="append" value="false" />
        <param name="append" value="false" />
        <param name="Threshold" value="INFO" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="[%p] %d %c %M - %m%n" />
        </layout>
    </appender>

    <logger name="successLogger" additivity="false">
        <level value="INFO"/>
        <appender-ref ref="successLog"/>
    </logger>

    <logger name="tempLogger" additivity="false">
        <level value="INFO"/>
        <appender-ref ref="tempLog"/>
    </logger> 

</log4j:configuration>