struts中的system.out

老大没有理解我的意思吧.
我是想在Action里用System.out.println输出一些变量信息.

"根本就不可能，只可能你的程序没有运行到那里去，当然出不来了"运行到了,就是不出.log用起来又不方便.

我试过了在Action里可以用System.out.printlln输出信息.
估计是你的程序没运行到那里

你用什么server 我用的tomcat

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package com.xywl.app1;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;/**
* @author wangli
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public class LogoffAction extends Action { /**
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public LogoffAction() {
super();
// TODO �Զ���ɹ��캯����
} /* ���� Javadoc��
* @see org.apache.struts.action.Action#execute(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
public ActionForward execute(ActionMapping arg0, ActionForm arg1,
HttpServletRequest arg2, HttpServletResponse arg3) throws Exception {
// TODO �Զ���ɷ������
HttpSession session=arg2.getSession();
LogonForm user=(LogonForm)session.getAttribute("user_key");
System.out.println("logoff");
if (user!=null){
StringBuffer message= new StringBuffer("LogoffAction:User");
session.removeAttribute("user_key");

}
return (arg0.findForward("welcome"));
}
}
中的.System.out.println("logoff");就是不出.

我用的server是Tomcat4.1
-------------------------package helloapp1;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.*;
import org.apache.struts.util.MessageResources;public final class HelloAction extends Action {
    /**
     * @param mapping ActionMapping  包含了这个Action的配置信息,和struts-config.xml中的对应元素
     * @param form ActionForm  包含了用户的表单数据
     * @param request HttpServletRequest  当前的HTTP请求对象
     * @param response HttpServletResponse  当前的HTTP响应对象
     * @return ActionForward  包含请求转发路径信息
     * @throws Exception  抛出异常
     */
    public ActionForward execute(ActionMapping mapping,
                                 ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response)
    throws Exception {        //从ApplicationResources.properties文件读取消息资源
        MessageResources messages = getResources(request);        //业务逻辑验证
        ActionErrors errors = new ActionErrors();
        String userName = ((HelloForm) form).getUserName();

        System.out.println("userName="+userName);

        String badUserName = "Monster";        if (userName.equalsIgnoreCase(badUserName)) {            /**
             * ActionError参数说明:
             * key:与消息资源文件的key相对应
             * value0,value1,value2,valu分别对应消息资源文件的参数{0},{1},{2},{3}
             */
            errors.add("username", new ActionError("hello.dont.talk.to.monster", badUserName ));           saveErrors(request, errors);
           return new ActionForward(mapping.getInput());
        }        PersonBean pb = new PersonBean();
        pb.setUserName(userName);
        //pb.saveToPersistentStore();        //将PersonBean对象保存在request对象中,以便向视图组件传递信息.
        request.setAttribute( Constants.PERSON_KEY, pb);       //从request范围内删除ActionForm Bean.
       //由于后续的请求转发目标组件不再需要HelloForm Bean,所以可将它删除
        request.removeAttribute(mapping.getAttribute());        // 将流程转发给name=SayHello的Forward转发组件,参考struts-config.xml
        return mapping.findForward("SayHello");    }
}----------------------------------------------------------
可以出的,没问题

我知道了,是tomcat中的Swallow Output:为false时有输出,不然没有.

调试易

struts中的system.out

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