struts2的<s:debug>值栈怎么用EL表达式获取到一个类的属性

![下面那个获取不到](https://img-ask.csdn.net/upload/201606/05/1465134871_224434.png

 package cn.symxl_01;

import com.opensymphony.xwork2.ActionSupport;

public class Login extends ActionSupport{
    private User user;
    private String message;

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    @Override
    public void validate() {
        // TODO Auto-generated method stub
        super.validate();
        if("".equals(user.getUsername())){
            this.addFieldError("user.username", "对不起，用户名不可以为空！");
        }
        if("".equals(user.getPassword())){
            this.addFieldError("user.password", "对不起，密码不能为空！");
        }
    }

    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        if("admin".equals(user.getUsername()) && "admin".equals(user.getPassword())){
            return SUCCESS;
        }
        message = "姚贝娜，你真的很勇敢！";
        return "show";
    }
}

)

user是一个JavaBean,有两个属性

Username首字母大写看看

${对象名.属性名}应该就可以取到了,既然你用了strust2那你可以用OGNL表达式啊