拦截器

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public class AuthorizationInterceptor extends AbstractInterceptor {

private static final long serialVersionUID = 2575538469018873724L;

public String intercept(ActionInvocation invocation) throws Exception {
  Map session = invocation.getInvocationContext().getSession();
  String username = (String) session.get(Constants.USERNAME_KEY);
  if (null != username && !username.equals("")) {
   // 合法用户
   return invocation.invoke();
  } else {
   System.out.println("拦截器：用户未登录---");
   return Action.LOGIN;
  }
}
}

================

import org.springframework.aop.MethodBeforeAdvice;

import java.lang.reflect.Method;

public class LoggingInterceptor implements MethodBeforeAdvice {

public void before(Method method, Object[] objects, Object o)
throws Throwable {
System.out.println("logging before: " + o.getClass());
}
}

===log4j.properties

## LOGGERS ##
#define a logger
#log4j.rootLogger=DEBUG,console,file
log4j.rootLogger=INFO,console,file

## APPENDERS ##
# define an appender named console, which is set to be a ConsoleAppender
log4j.appender.console=org.apache.log4j.ConsoleAppender

# define an appender named file, which is set to be a RollingFileAppender
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=d:/demo_log.txt

#set the log's size
log4j.appender.file.MaxFileSize=1000KB
log4j.appender.file.MaxBackupIndex=20

## LAYOUTS ##
# assign a SimpleLayout to console appender
log4j.appender.console.layout=org.apache.log4j.SimpleLayout

# assign a PatternLayout to file appender
log4j.appender.file.layout=org.apache.log4j.PatternLayout
# For debug
# log4j.appender.file.layout.ConversionPattern=[%-5p][%t][%C][%d{yyyy-MM-dd HH:mm:ss}] %m%n
# For deployment
log4j.appender.file.layout.ConversionPattern=[%-5p][%d{yyyy-MM-dd HH:mm:ss}] %m%n

=========================

<interceptor-stack name="mydefault">
    <interceptor-ref name="defaultStack" />
    <interceptor-ref name="authority" />
   </interceptor-stack>
  </interceptors>

<default-interceptor-ref name="mydefault" />

<global-results>
   <result name="login">login.jsp</result>
  </global-results>

==========================

public class LogoutAction extends ActionSupport {

private static final long serialVersionUID = 1L;

private UserDAO userDAO;

public String execute() throws Exception {
  ActionContext.getContext().getSession().clear();
  return Action.SUCCESS;
}

public UserDAO getUserDAO() {
  return userDAO;
}

public void setUserDAO(UserDAO userDAO) {
this.userDAO = userDAO;
}
}