Struts的ActionForm表单验证

1.在ActionForm中添加

Public ActionErrors validate(ActionMapping arg0,HttpServletRequest arg1)

{

    ActionErrors errors=new ActionErrors();

    arg1.setAttribute("loginFormBean",this);

    if(username==null||username.equals(""))

    {

errors.add("username",new ActionMessage("login.error.username"));

    }

    if(password==null||password.equals(""))

    {

errors.add("password",new ActionMessage("login.error.password"));

    }

    return errors;

}

2.在jsp中添加

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>

<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>

<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>

<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>   

    <tr>

        <td>用户名</td>

        <td>

        <logic:present name="loginFormBean">

        <html:text property="username"  name="loginFormBean"/>

        </logic:present>

        <logic:notPresent name="loginFormBean">

        <input type="text" name="username">

        </logic:notPresent>

        <html:errors property="username"/>

        </td>

    </tr>

    <tr>

        <td>密&nbsp;&nbsp;码</td>

        <td>

        <logic:present name="loginFormBean">

        <html:text property="password"  name="loginFormBean"/>

        </logic:present>

        <logic:notPresent name="loginFormBean">

        <input type="text" name="password">

        </logic:notPresent >

        <html:errors property="password"/>

        </td>

    </tr>