log4j支持把error的信息输出到日志文件，而把info的信息输出到控制台,怎么解决?

如果支持log4j分别输出，又如何写配置文件了？

------解决方法--------------------------------------------------------
MyAppender.java :



import org.apache.log4j.Appender;
import org.apache.log4j.ConsoleAppender;
import org.apache.log4j.FileAppender;
import org.apache.log4j.Layout;
import org.apache.log4j.Level;
import org.apache.log4j.spi.ErrorHandler;
import org.apache.log4j.spi.Filter;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.spi.OptionHandler;

public class MyAppender implements Appender, OptionHandler {

private ConsoleAppender consoleAppender = new ConsoleAppender();

private FileAppender fileAppender = new FileAppender();

public static void main(String[] args) {

}

public void doAppend(LoggingEvent arg0) {

if (arg0.getLevel().equals(Level.ERROR)) {
fileAppender.doAppend(arg0);
} else if (arg0.getLevel().equals(Level.INFO)) {
consoleAppender.doAppend(arg0);
} else {
return;
}
;
}

public void setLayout(Layout arg0) {
consoleAppender.setLayout(arg0);
fileAppender.setLayout(arg0);
}

public void addFilter(Filter arg0) {
consoleAppender.addFilter(arg0);
fileAppender.addFilter(arg0);
}

public void clearFilters() {

consoleAppender.clearFilters();
fileAppender.clearFilters();
}

public void close() {

consoleAppender.close();
fileAppender.close();
}

public ErrorHandler getErrorHandler() {

return consoleAppender.getErrorHandler();
}

public Filter getFilter() {

return consoleAppender.getFilter();
}

public Layout getLayout() {

return consoleAppender.getLayout();
}

public String getName() {

return this.getClass().getName();
}

public boolean requiresLayout() {

return consoleAppender.requiresLayout();
}

public void setErrorHandler(ErrorHandler arg0) {

consoleAppender.setErrorHandler(arg0);
fileAppender.setErrorHandler(arg0);
}

public void setName(String arg0) {

consoleAppender.setName(arg0);
fileAppender.setName(arg0);
}

public void setFile(String name) {

fileAppender.setFile(name);
}

public String getFile() {

return fileAppender.getName();
}

public void activateOptions() {

fileAppender.activateOptions();
consoleAppender.activateOptions();

}