struts.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <constant name="struts.devMode" value="true"></constant> <constant name="struts.enable.DynamicMethodInvocation" value="true"></constant> <include file="cn/itcast/validate/struts_validate.xml"></include> </struts>
struts_validate.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="validate" namespace="/validate" extends="struts-default">
<action name="validateAction_*" class="cn.itcast.validate.ValidateAction" method="{1}">
<result name="success">/validate/success.jsp</result>
<result name="input">/validate/login.jsp</result>
</action>
</package>
</struts>ValidateAction.java
package cn.itcast.validate;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class ValidateAction extends ActionSupport {
private String username;
public String getUsername() {
return username;
}
public void setUsername(String username) {
System.out.println("ValidateAction ***** setusername()");
this.username = username;
}
public String getPsw() {
return psw;
}
public void setPsw(String psw) {
this.psw = psw;
}
private String psw;
/*
* 验证方法:
* *改动作类action必须继承ActionSupport或者实现Validateable接口
* *必须保证serUsername(),validate(),login()方法的执行顺序如下：
* *setUsername()
* *validate()
* *login()
**如果登陆失败，如何处理：
**this.addFildError(key,value);
**key:错误提示字段
**value:错误提示信息
**什么时候才是验证通过？
**验证通过：1.map集合存在;2.map集合存在时为,
**验证不通过:map集合存在，并且不为空
**分析需求：
**用户名不能为null,""
**密码不能为null,"",并且密码的长度6-12之间
* *针对所有业务方法进行验证还是针对某个指定业务方法进行验证？
* *重写的validate()方法，针对所有业务方法进行验证
* * 重写的validate()方法加上要验证的制定的业务方法名(业务方法名的首字母大写)，实现针对某个指定的业务方法进行验证
* *为什么要这样进行拼接？因为struts2框架底层拼接，如果不这样写底层就找不到对应方法名
* (non-Javadoc)
* @see com.opensymphony.xwork2.ActionSupport#validate()
*/
public void validateLogin() {
System.out.println("ValidateAction ****** validate()");
if(username==null||username.equals("")){
this.addFieldError("error", "用户名不能为空");
}
if(psw==null||psw.equals("")){
this.addFieldError("error", "密码不为空");
}else{
String pattern="^[0-9a-zA-Z]{6,12}";
Pattern p = Pattern.compile(pattern);
Matcher m = p.matcher(psw);
boolean b = m.matches();
if(!b){
this.addFieldError("error", "密码的长度必须在6-12之间");
}
}
}
public String login(){
// 验证
System.out.println("ValidateAction ****** login()"+"username:"+username+"psw:"+psw);
return "success";
}
public String test(){
System.out.println("validate ******* test()");
return "success";
}
}login.jsp
<%@ page language="java" pageEncoding="UTF-8" contentType="text/html; charset=utf-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<html>
<head>
<title>My JSP ‘login.jsp‘ starting page</title>
</head>
<body>
<br>
<s:fielderror/>
<s:form name="loginForm" method="post" namespace="/validate" action="validateAction_login.action" theme="simple" >
<table border="1">
<tr>
<td>用户名</td>
<td> <s:textfield name="username" /></td>
</tr>
<tr>
<td>密码</td>
<td><s:password name="psw" /></td>
</tr>
<tr>
<td> </td>
<td><s:submit value="登陆"/></td>
</tr>
</table>
</s:form>
</body>
<a href="${pageContext.request.contextPath}/validate/validateAction_test.action">test其他的方法</a>
</html>原文地址：http://vincent1992.blog.51cto.com/4621739/1585290
