<form action="login" method="post">

      <div class="form-group has-feedback">

          <s:fielderror></s:fielderror>  //重点，放一块报错信息的空间

      </div>

      <div class="form-group has-feedback">

        <input name="name" type="text" class="form-control" placeholder="Email" value="">

        <span class="glyphicon glyphicon-user form-control-feedback"></span>

      </div>

      <div class="form-group has-feedback">

        <input name="password" type="password" class="form-control" placeholder="Password" value="">

        <span class="glyphicon glyphicon-lock form-control-feedback"></span>

      </div>

      <div class="row">

        <div class="col-xs-8">

          <div class="checkbox icheck">

            <label>

              <input type="checkbox"> Remember Me

            </label>

          </div>

        </div>

        <!-- /.col -->

        <div class="col-xs-4">

          <button type="submit" class="btn btn-primary btn-block btn-flat"><s:text name="loginSubmit"/></button>

        </div>

        <!-- /.col -->

      </div>

    </form>

@SuppressWarnings("serial")

    public class LoginAction extends ActionSupport {

    private static final transient Logger logger = LogManager.getLogger(LoginAction.class);

    private String name;

    private String password;

    public String execute() {

        logger.debug("name={},password={}", name, password);

        HttpServletRequest request = ServletActionContext.getRequest();

        logger.debug("get locale = {}", request.getLocale());

        if ("lings".equals(name)) {

            return SUCCESS;

        } else {

            return INPUT;

        }

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getPassword() {

        return password;

    }

    public void setPassword(String password) {

        this.password = password;

    }

 　　　　<action name="login" method="execute" class="com.sanro.strutsDemo.action.LoginAction">

            <result name="success" type="tiles">tiger</result>  //成功的跳转

            <result name="input">/index.jsp</result>            //校验失败的跳转

        </action>

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE validators PUBLIC

          "-//Apache Struts//XWork Validator 1.0.3//EN"

          "http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">

        <!-- DTD文件信息见struts2-core-2.x.x.jar中的具体情况 -->

<validators>

    <!--验证的每一个字段用filed表示 -->

    <!--验证用户名 -->

    <field name="name">

        <!--指定使用的验证器,此处选择非空验证 -->

        <field-validator type="requiredstring">

            <!--验证失败的错误提示信息 -->

            <message>用户名不能为空</message>

        </field-validator>

    </field>

    <!--验证pwd -->

    <field name="password">

        <!--密码非空 -->

        <field-validator type="requiredstring">

            <message>密码不能为空</message>

        </field-validator>

        <!--密码长度验证 -->

        <field-validator type="stringlength">

            <param name="minLength">6</param>

            <param name="maxLength">8</param>

            <message>密码必须为6-8位！</message>

        </field-validator>

    </field>

</validators>

@SuppressWarnings("serial")

    public class LoginAction extends ActionSupport {

    .....

    @Override

    public void validate() {

        logger.debug("firstly, validate!!!");

//        super.validate();

        if (!password.equals("123456")) {

            this.addFieldError("password", "对不起，password is error！");

        }

    }

    ......

<validators>

    <validator name="required" class="com.opensymphony.xwork2.validator.validators.RequiredFieldValidator" />

    <validator name="requiredstring" class="com.opensymphony.xwork2.validator.validators.RequiredStringValidator" />

    <validator name="int" class="com.opensymphony.xwork2.validator.validators.IntRangeFieldValidator" />

    <validator name="long" class="com.opensymphony.xwork2.validator.validators.LongRangeFieldValidator" />

    <validator name="short" class="com.opensymphony.xwork2.validator.validators.ShortRangeFieldValidator" />

    <validator name="double" class="com.opensymphony.xwork2.validator.validators.DoubleRangeFieldValidator" />

    <validator name="date" class="com.opensymphony.xwork2.validator.validators.DateRangeFieldValidator" />

    <validator name="expression" class="com.opensymphony.xwork2.validator.validators.ExpressionValidator" />

    <validator name="fieldexpression" class="com.opensymphony.xwork2.validator.validators.FieldExpressionValidator" />

    <validator name="email" class="com.opensymphony.xwork2.validator.validators.EmailValidator" />

    <validator name="creditcard" class="com.opensymphony.xwork2.validator.validators.CreditCardValidator" />

    <validator name="url" class="com.opensymphony.xwork2.validator.validators.URLValidator" />

    <validator name="visitor" class="com.opensymphony.xwork2.validator.validators.VisitorFieldValidator" />

    <validator name="conversion" class="com.opensymphony.xwork2.validator.validators.ConversionErrorFieldValidator" />

    <validator name="stringlength" class="com.opensymphony.xwork2.validator.validators.StringLengthFieldValidator" />

    <validator name="regex" class="com.opensymphony.xwork2.validator.validators.RegexFieldValidator" />

    <validator name="conditionalvisitor" class="com.opensymphony.xwork2.validator.validators.ConditionalVisitorFieldValidator" />

  </validators>