我用Struts2写一个验证器要求验证用户名不得为空等等，但是那些验证都显示不出来求各位大神指点指点。

login2Action.java

package cn.edu.xmut.action;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionSupport;

public class Login2Action extends ActionSupport{
    private static final long serialVersionUID = 1L;
    private String username;
    private String password;
    public String login(){
        return Action.SUCCESS;
    }
//  @Override
//  public void validate() {
//      if(username == null || "".equals(username)){
//          this.addFieldError("username",this.getText("username.null"));
//      }
//      if(password == null||"".equals("password")){
//          this.addFieldError("password",getText("password.null"));
//      }   
//  }

    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
}

login2.jsp

struts.xml

LoginAction-validation.xml

http://blog.csdn.net/xy_focus/article/details/51017090 请自己对照

http://zhidao.baidu.com/link?url=HHgKoZO7ISsY4mX7fFM1Npth7J0S7soqCDa4Vl1eYCfDhxqjM4-vFybwXGQAunVRfeGHOo13WgY4aaDVVMFscjJEWMSOvofZLgHq-RmukA3