struts-actionerror

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loginaction

package com.god.action;    import com.opensymphony.xwork2.ActionSupport;    public class LoginAction_2014_5_5 extends ActionSupport{      private String uname;      private String upasswd;      public String getUname() {          return uname;      }      public void setUname(String uname) {          this.uname = uname;      }      public String getUpasswd() {          return upasswd;      }      public void setUpasswd(String upasswd) {          this.upasswd = upasswd;      }            public void validateExecute(){          System.out.println("--validate--");          if(uname==null||uname.equals("")){              super.addActionError("用户名不能为空");          }          if(upasswd==null||upasswd.equals("")){              super.addActionError("密码不能为空");          }      }      public void validate(){          System.out.println("--validate2--");          if(uname==null||uname.equals("")){              super.addActionError("用户名不能为空");          }          if(upasswd==null||upasswd.equals("")){              super.addActionError("密码不能为空");          }      }            public String execute(){          System.out.println("--执行--");          if(uname.equals("zhu")&&upasswd.equals("123")){              return "ok";          }else{              return "no";          }      }  }

struts.xml

<package name="default" namespace="/2014_strut2_lx"  extends="struts-default" >             <action name="loginAction" class="com.god.action.LoginAction_2014_5_5" >          <result name="ok">/2014_5_5_welcome_lx_01.jsp</result>      <result name="no">/2014_5_5_welcome_lx_02.jsp</result>      <result name="input">/2014_5_5_login_lx_bqk_01.jsp</result><!-- addActionError，指明返回到哪个网址 -->      </action>     </package>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>  <%@taglib uri="/struts-tags" prefix="s" %><!-- 引用标签 -->  <%  String path = request.getContextPath();  String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";  %>    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  <html>    <head>      <base href="<%=basePath%>">            <title>My JSP '2014_4_29_login_lx_01.jsp' starting page</title>            <meta http-equiv="pragma" content="no-cache">      <meta http-equiv="cache-control" content="no-cache">      <meta http-equiv="expires" content="0">          <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">      <meta http-equiv="description" content="This is my page">      <!--     <link rel="stylesheet" type="text/css" href="styles.css">     -->      </head>       <body>         <center>          <h3>这是一个简单的Struts UI标签库的例子</h3>          <br/><hr/>          <div>              <font color='red'><s:actionerror/></font>          </div>          <s:form action="loginAction" namespace="/2014_strut2_lx">          <s:textfield name="uname" label="请输入用户名" />          <s:password name="upasswd" label="请输入密码" />          <s:submit value="登录" />          </s:form>      </center>    </body>  </html>

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