Struts2 输入校验第四弹

ActionSupport 里面有一个validate.可以重写里面你的方法。

校验执行流程：

1）首先进行类型转化

2）然后进行输入校验（执行validate方法）

3）如果在上述过程中出现了任何错误（1 or 2），都不会再去执行execute方法。会转向struts.xm中该action的名为input的result所对应的页面。

actionsupport类的addActionError()方法的实现：首先创建一个arrayList对象.然后将错误消息添加到该ArrayList对象中。　

当调用getActionError()方法返回Action级别的错误信息列表时，返回的实际上是集合的一个副本而不是集合本身，因此对集合副本调用clear()方法清除的依旧是副本中的元素而非原集合中的元素，此时原集合中的内容没有受到任何影响，换句话话，Action级别的错误信息列表对开发者来说是只读的。　

FieldError级别的错误信息底层是LinkedHashMap实现的，该Map的key是string类型，value是List<String>类型，这就表示一个field name可以对应多条错误信息，这些错误信息都放置在List<String>集合中。

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
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 'register.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>
    <h2><font color="blue">用户注册</font></h2>
    
    <s:actionerror cssStyle="color:red"/>
    
    ----------------------------------------
    
    <s:fielderror cssStyle="color:blue"></s:fielderror>
    
    <!-- 
    <form action="register.action">
    
    username: <input type="text" name="username" size="20"><br>
    password: <input type="password" name="password" size="20"><br>
    repassword: <input type="password" name="repassword" size="20"><br>
    age: <input type="text" name="age" size="20"><br>
    birthday: <input type="text" name="birthday" size="20"><br>
    graduation: <input type="text" name="graduation" size="20"><br>
    
    <input type="submit" value="submit"/>
    
    </form>
     -->
    <s:form action="register.action" theme="simple">
    
    username: <s:textfield name="username" label="username"></s:textfield><br>
    password: <s:password name="password" label="password"></s:password><br>
    repassword: <s:password name="repassword" label="repassword"></s:password><br>
    age: <s:textfield name="age" label="age"></s:textfield><br>
    birthday: <s:textfield name="birthday" label="birthday"></s:textfield><br>
    graduation: <s:textfield name="graduation" label="graduation"></s:textfield><br>
    
    <s:submit value="submit"></s:submit>
       
    </s:form>
    
  </body>
</html>

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
 4     "http://struts.apache.org/dtds/struts-2.0.dtd">
 5     
 6 <struts>
 7     
 8     <package name="struts2" extends="struts-default">
 9         <action name="register" class="com.shengsiyuan.struts2.RegisterAction">
10             <result name="success">/registerResult.jsp</result>
11             <result name="input">/register.jsp</result>
12         </action>
13     </package>
14     
15 </struts>

struts.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.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  
  <filter-mapping>
      <filter-name>struts2</filter-name>
      <url-pattern>/*</url-pattern>
  </filter-mapping>
  
</web-app>

web.xml

import java.util.Calendar;
import java.util.Date;

import com.opensymphony.xwork2.ActionSupport;

public class RegisterAction extends ActionSupport
{
    private String username;
    
    private String password;
    
    private String repassword;
    
    private int age;
    
    private Date birthday;
    
    private Date graduation;

    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;
    }

    public String getRepassword()
    {
        return repassword;
    }

    public void setRepassword(String repassword)
    {
        this.repassword = repassword;
    }

    public int getAge()
    {
        return age;
    }

    public void setAge(int age)
    {
        this.age = age;
    }

    public Date getBirthday()
    {
        return birthday;
    }

    public void setBirthday(Date birthday)
    {
        this.birthday = birthday;
    }
    
    public Date getGraduation()
    {
        return graduation;
    }

    public void setGraduation(Date graduation)
    {
        this.graduation = graduation;
    }

    @Override
    public String execute() throws Exception
    {
        
        
        return SUCCESS;
    }
    
    @Override
    public void validate()
    {
        if(null == username || username.length() < 4 || username.length() > 6)
        {
            this.addActionError("username invalid");
            
            this.addFieldError("username", "username invalid in field");
        }
        
        if(null == password || password.length() < 4 || password.length() > 6)
        {
            this.addActionError("password invalid");
        }
        else if(null == repassword || repassword.length() < 4 || repassword.length() > 6)
        {
            this.addActionError("repassword invalid");
        }
        else if(!password.equals(repassword))
        {
            this.addActionError("the passwords not the same");
        }
        
        if(age < 10 || age > 50)
        {
            this.addActionError("age invalid");
        }
        
        if(null == birthday)
        {
            this.addActionError("birthday invalid");
        }
        
        if(null == graduation)
        {
            this.addActionError("graduation invalid");
        }
        
        if(null != birthday && null != graduation)
        {
            Calendar c1 = Calendar.getInstance();
            c1.setTime(birthday);
            
            Calendar c2 = Calendar.getInstance();
            c2.setTime(graduation);
            
            if(!c1.before(c2))
            {
                this.addActionError("birthday should be before graduation");
            }
        }
        
        //this.getFieldErrors().clear();
        //this.getActionErrors().clear();
        
        this.clearActionErrors();
        this.clearFieldErrors();
        
        System.out.println("invoked!!!");
    }
    
}

RegisterAction

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
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 'registerResult.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>
    
    username: <s:property value="username"/><br>
    password: <s:property value="password"/><br>
    age:<s:property value="age"/><br>
    birthday:<s:property value="birthday"/><br>
    graduate:<s:property value="graduation"/>   
    
  </body>
</html>

registerResult.jsp

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原文地址：https://www.cnblogs.com/feiguo/p/8151346.html

Struts2 输入校验 第四弹

Struts2 输入校验第四弹