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structs2输入校验实例代码如下：
web.xml
 <?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
struts.xml
<?xml version="1.0" encoding="GBK" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="struts" extends="struts-default">
<action name="Login" class="HelloWorld.LoginAction">
<result name="input">/helloworld/index.jsp</result>
<result name="success">/helloworld/welcome.jsp</result>
<result name="error">/helloworld/error.jsp</result>
</action>
</package>
</struts>
LoginAction
package HelloWorld;
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
  public class LoginAction extends ActionSupport...{
 private String username;
private String password;
private String[] books;
  public String[] getBooks() ...{
return books;
 }
public void setBooks(String[] books) ...{
this.books = books;
}
public String execute() throws Exception...{
if(this.getUsername().equals("admin")&&this.getPassword().equals("1234"))...{
ActionContext.getContext().getSession().put("user", this.getUsername());
BookService bs=new BookService();
this.setBooks(bs.getBooks());
return SUCCESS;
}else...{
return ERROR;
}
}
public String getUsername() ...{
return username;
}
public void setUsername(String username) ...{
this.username = username;
}
public String getPassword() ...{
return password;
}
public void setPassword(String password) ...{
this.password = password;
}
 }
BookService.java
package HelloWorld;
public class BookService ...{
private String[] books=new String[]...{
"Spring 2.0",
"Hibernate 3.2",
"Struts 2.0"
};
public String[] getBooks()...{
return books;
}
}
LoginAction-validation.xml
<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE validators PUBLIC "-//OpenSymphony Group//XWork Validator 1.0.2//EN"
"http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">
<validators>
<field name="username">
<field-validator type="requiredstring">
<message key="user.required"/>
</field-validator>
</field>
<field name="password">
<field-validator type="requiredstring">
<message key="pass.required"/>
</field-validator>
</field>
</validators>
login.jsp
<%...@ page language="java" contentType="text/html; charset=gb2312"
pageEncoding="gb2312"%>
<%...@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title></title>
</head>
<body>
<s:form action="Login">
<s:textfield name="username" key="username"></s:textfield>
<s:password name="password" key="password"></s:password>
<s:submit value="login"></s:submit>
</s:form>
</body>
</html>
welcome.jsp
<%...@ page language="java" contentType="text/html; charset=gb2312"
pageEncoding="gb2312"%>
<%...@ page isELIgnored="false" %>
<%...@ taglib prefix="s" uri="/struts-tags" %>
<%...@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title></title>
</head>
<body>
欢迎${sessionScope.user}登陆
<c:out value="${requestScope.now}"></c:out>
<br>
<table border="1">
<s:iterator value="books" status="index">
<s:if test="#index.odd==true">
<tr style="background-color=#cccccc">
</s:if>
<s:else>
<tr>
</s:else>
<td>书名:</td>
<td><s:property/></td>
</tr>
</s:iterator>
</table>
</body>
</html>
error.jsp
<%...@ page language="java" contentType="text/html; charset=gb2312"
pageEncoding="gb2312"%>
<html>
<head>
<title></title>
</head>
<body>
登陆失败
</body>
</html>
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