struts2中validate的用法-CFANZ编程社区

package com.test.action;

import com.opensymphony.xwork2.ActionSupport;
import com.test.model.User;

public class CheckUser extends ActionSupport{

  /**
   * 
   */
  private static final long serialVersionUID = 1L;
  
  private User user=new User();
  private String username;
  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;
  }


  private String password;

  @Override
  public String execute() throws Exception {
    System.out.println("checkuser");
    // TODO Auto-generated method stub
    
    
    return SUCCESS;
  }


  /*注意，validate方法是在execute之前执行*/
  @Override
  public void validate() {
    user.setUsername(this.getUsername());
    user.setPassword(this.getPassword());
    System.out.println(user);
    // TODO Auto-generated method stub
    if(user.getUsername().equals("admin"))
    {
      this.addFieldError("username_error", "权限不够");
    }
    super.validate();
  }
  

}

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
  "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
  "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    
  <!--   采用注解的方式 -->
  
    <constant name="struts.enable.DynamicMethodInvocation" value="true" />
    <constant name="struts.devMode" value="true" /> 

    <package name="default" namespace="" extends="struts-default">
        <!-- struts2捕获action类异常 -->
        <!-- <global-results>
      <result name="error">/error.jsp</result>
    </global-results>
    <global-exception-mappings>
      <exception-mapping result="error" exception="java.lang.Exception"></exception-mapping>
    </global-exception-mappings> -->
      <action name="link" class="com.test.action.LoginAction">
          <result>/result.jsp</result>
      </action>
      <action name="linkIOC" class="com.test.action.LoginActionIOC">
          <result>/result.jsp</result>
      </action>
      <!-- 正确和错误的分别跳转，齐总input是在验证失败后会跳转的页面 -->
      <action name="data" class="com.test.action.CheckUser">
           <result name="success">/result.jsp</result>
          <result name="input">/login.jsp</result>
      </action>
    </package>

   
    <!-- Add packages here -->

</struts>

html页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<!-- 这个地方是用来显示错误信息 -->
<s:fielderror/>
<form action="data.action" method="post">
<input type="text" name="username"><br>
<input type="password" name="password"><br>
<input type="submit" name="ok"><br>
</form>
</body>
</html>