问题描述

用Struts2进行编写的留言板！！

    <div id="right_content">
         <div class="members_login">
                <s:if  test="#session.user != null">
                    <h3>欢迎您！<s:property value="#session.user.nickname"/>
                        <s:if test="#session.user.username == 'admin'">
                            <a href="admin/admin">后台管理</a>
                        </s:if>
                     <a href="logout.action">注销</a></h3>
                    <p><a href="showMessages.action" class="login_submit">进入留言</a></p>
                </s:if><s:else>
                <h1>用户登录</h1>
                <form action="login" method="post" name="form_login"
                    onsubmit="return validate(this);">
                    <div class="login_row">
                     <label class="login">用户名:</label>
                        <s:textfield name="username"  cssClass="login_input"></s:textfield>
                    </div>
                    <div class="login_row">
                     <label class="login">密码:</label>
                        <s:password name="password"  cssClass="login_input"></s:password>
                    </div>
                    <div class="login_row">
                        <s:submit cssClass="login_submit" value="登录" ></s:submit>
                        <label>没有用户名？请<a href="${pageContext.request.contextPath}/registerUI.action">注册</a></label>
                    </div>
                </form>
                <s:fielderror cssStyle="color:red;font-size:12px"></s:fielderror>
                </s:else>
    </div>

onsubmit="return validate(this）几个。JSP页面都错误，自己弄了好久都没弄好，请高手教教我