Struts 2 數(shù)據(jù)驗證的兩種方式——手動驗證和xml驗證

1. 手動驗證——通過編寫action進行驗證

  • 建立表單 login_1.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <body>
    <form action="dataAction.action" method="post">
         name:<input name="name" type="text"><br>
         age:<input name="age" type="text"><br>
         <input type="submit" value="登陸">
    </form>
  </body>
</html>
  • struts.xml編寫
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
      <!-- 
                    數(shù)據(jù)驗證,手動驗證
       -->
      <package name="checke" namespace="/" extends="struts-default">
           <action name="dataAction" class="actions.dataAction" method="execute">
                 <result name="input">/index.jsp</result>
                 <result name="success">/success.jsp</result>
           </action>
      </package>
</struts>
  • src下建立actions包，在里面編寫data.Action.java
    • addFieldError()方法執(zhí)行后到<result name="input">/index.jsp</result>,跳轉(zhuǎn)到index對應(yīng)的頁面。
    • 若action中有多個方法
      validate()驗證對所有方法都有效
    • 若想只對某方法進行驗證，如Login()
      修改validate()→validatelogin() 
package actions;

import java.util.regex.Pattern;

import com.opensymphony.xwork2.ActionSupport;
public class dataAction extends ActionSupport {
    private String name;
    private String age;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
    public void validate(){
        if (name == null || name.equals("")){
            addFieldError("name","姓名不能為空:"+name);
        }
        if (age == null || name.equals("")){
            addFieldError("age","年齡不能為空:"+age);
        }else if(!isInteger(age)){
            addFieldError("age","年齡輸入不合理:"+age);
        }else if(Integer.parseInt(age)>100 && Integer.parseInt(age)<1){
            addFieldError("age","請輸入年齡在0-100之間:"+age);
        }
        System.out.println("name:"+name+";age:"+age);
    }
    //判斷字符串是否為整數(shù)
    public static boolean isInteger(String str) {  
            Pattern pattern = Pattern.compile("^[-\\+]?[\\d]*$");  
            return pattern.matcher(str).matches();  
    }
    public String execute(){
        return "success";
    }

}
  • 編寫index.jsp頁面
    • 在jsp頁面中使用struts標簽時需要加入如下語句:
      <%@ taglib uri="/struts-tags" prefix="s" %>
      <s:fielderror>標簽：
      如：addFieldError("name","姓名不能為空")執(zhí)行后，
       <s:fielderror>
          <s:param>name</s:param>
      </s:fielderror>
    這段語句將獲取name對應(yīng)的值姓名不能為空 
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%
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 '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:fielderror>
            <s:param>name</s:param>
        </s:fielderror>
        <s:fielderror>
            <s:param>age</s:param>
        </s:fielderror>
  </body>
</html>
  • 編寫success.jsp頁面：
    • <s:property>標簽： 
       name:<s:property value="name"/><br>
  age:<s:property value="age"/>
    • 通過<s:property>標簽返回name和age的值。
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%
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 'success.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>
        name:<s:property value="name"/><br>
        age:<s:property value="age"/>
  </body>
</html>

2. XML驗證

  • struts提供了一套標準的表單驗證機制，通過配置文件可以調(diào)用系統(tǒng)的16個表單驗證器進行表單驗證
    • 約束信息
      xwork-validator-1.0.3.dtd
    • 16個表單驗證器在哪里？
      xwork-core-2.3.24.1.jar
      →com.opensymphony.xwork2.validator.validators
      →default.xml
  • 新建一個登陸界面login_2.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <body>
     <form action="dataAction1.action" method="post">
         name:<input name="name" type="text"><br>
         age:<input name="age" type="text"><br>
         <input type="submit" value="登陸">
    </form>
  </body>
</html>
  • 編寫struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
      <!-- 
                    數(shù)據(jù)驗證,xml驗證
       -->
      <package name="checke" namespace="/" extends="struts-default">
           <action name="dataAction1" class="actions.dataAction1" method="execute">
                 <result name="input">/index.jsp</result>
                 <result name="success">/success.jsp</result>
     
           </action>
      </package>
</struts>
  • 在src/actions下編寫java類
package actions;

import com.opensymphony.xwork2.ActionSupport;

public class dataAction1 extends ActionSupport {
    private String name;
    private String age;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
    public String execute(){
        return "success";
    }
}
  • 在src/actions下建立xml格式文件。
    • 命名規(guī)則：
      1. 數(shù)據(jù)驗證用戶是整個Action對象：
        ActionName-validation.xml
      2. 只是對Action對象中的特定方法進行驗證:
        ActionName-AliasName-validation.xml
        ActionName 為Action類名
        AliasName 為Action的name屬性的名稱。
        例如：有struts文件如下：
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
      <package name="checke" namespace="/" extends="struts-default">
           <action name="ActionloginUser" class="actions.dataAction" method="User">
                 <result name="input">/index.jsp</result>
                 <result name="success">/success.jsp</result>
           </action>
          <action name="Actionloginadmin" class="actions.dataAction" method="admin">
                 <result name="input">/index.jsp</result>
                 <result name="success">/success.jsp</result>
           </action>
      </package>
</struts>
  1. 想要驗證整個Action對象，xml為: dataAction-validation.xml
  2. 只是驗證action里面的admin方法，xml為：dataAction-Actionloginadmin-validation.xml
  • 編寫dataAction1-validation.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.3//EN" 
"http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">
<validators>
    <field name="name">
        <field-validator type="requiredstring">
            <message>
                姓名不能為空
            </message>
        </field-validator>
    </field>
    <field name="age">
        <field-validator type="requiredstring">
            <message>
                年齡不能為空
            </message>
        </field-validator>
    </field>
</validators>
  • 編寫結(jié)果界面，sucess.jsp index.jsp 參考手動驗證的編寫。
?著作權(quán)歸作者所有,轉(zhuǎn)載或內(nèi)容合作請聯(lián)系作者
【社區(qū)內(nèi)容提示】社區(qū)部分內(nèi)容疑似由AI輔助生成，瀏覽時請結(jié)合常識與多方信息審慎甄別。
平臺聲明：文章內(nèi)容（如有圖片或視頻亦包括在內(nèi)）由作者上傳并發(fā)布，文章內(nèi)容僅代表作者本人觀點，簡書系信息發(fā)布平臺，僅提供信息存儲服務(wù)。

相關(guān)閱讀更多精彩內(nèi)容

友情鏈接更多精彩內(nèi)容