%TOMCAT_HOME%/bin/catalina.sh

找到这样一段：

echo "Using CATALINA_BASE: $CATALINA_BASE"

echo "Using CATALINA_HOME: $CATALINA_HOME"

echo "Using CATALINA_TMPDIR: $CATALINA_TMPDIR"

echo "Using JAVA_HOME: $JAVA_HOME"

在其后加上:
CATALINA_OPTS="$CATALINA_OPTS -Xms128m -Xmx256m -XX:MaxNewSize=256m -XX:MaxPermSize=256m $JPDA_OPTS"

JAVA_OPTS="$JAVA_OPTS -Djava.awt.headless=true"

echo "Using CATALINA_OPTS: $CATALINA_OPTS"

echo "Using JAVA_OPTS: $JAVA_OPTS"
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windows下就是.bat

linux下就是.sh