表单校验---struts2

一写validate方伐

　　　　1 让你的Action继承ActionSupport类，

　　　　　　重写validate方法，（或validateXxxx）

　　　　　　判断，写入错误信息

　　　　　　jsp中用标签显示，struts。xml中配置转向的页面

package he.action;import java.util.Map;import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;public class Login extends ActionSupport{String name;String pwd;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}@Overridepublic void validate() {// TODO Auto-generated method stubsuper.validate();if("".equals(name)||name==null){this.addFieldError("name", "name can not be null");}if("".equals(pwd)||pwd==null){this.addFieldError("pwd", "pwd can not be null");}}public String execute(){System.out.print(name+"  \n"+pwd);if("scott".equals(name)&&"1234".equals(pwd)){Map<String, Object> session = ActionContext.getContext().getSession();session.put("user", name);return "success";}this.addActionError("name do not match pwd");return "fail";}}

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN""http://struts.apache.org/dtds/struts-2.1.7.dtd"><struts><package name="struts2-demo1" extends="struts-default"><action name="login" class="he.action.Login"><result name='success' type='dispatcher'>/ok.jsp</result><result name='fail' type='dispatcher'>/index.jsp</result><result name="input">/index.jsp</result></action></package>
</struts>

Struts.xml

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@taglib uri="/struts-tags"  prefix="s" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>"><title>My JSP 'index.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><s:actionerror/><s:form action="login" ><s:textfield  name="name" label="name" labelposition="left"></s:textfield><s:fielderror fieldName="name"></s:fielderror><br><s:textfield  name="pwd" label="pwd" labelposition="left"></s:textfield><s:fielderror fieldName="pwd"></s:fielderror><br><s:submit  value="OK"></s:submit></s:form></body>
</html>