現在這個驗證呢，跟第一篇文章的那個還有所不一樣，之前的是配置資源檔案和配置驗證檔案的做法，這次呢是在ActionForm裡面的一個validator方法中純手工寫代碼的方式，實作的登入驗證效果一樣
login.jsp
<%@ page pageEncoding="UTF-8"%>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Struts第一個應用:登入驗證</title>
</head>
<body>
<h3>Struts第一個應用:登入驗證</h3><hr/>
<ul style="color:red">
<html:messages id="msg">
<li>${msg}</li>
</html:messages>
</ul>
<form id="myForm" name="myForm" action="login.do" method="post">
<table width="600px">
<tr>
<td>登入名</td>
<td><input type="text" name="loginname"/></td>
</tr>
<tr>
<td>密碼</td>
<td><input type="password" name="pwd"/></td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" value="送出"/>
<input type="reset" value="重置"/>
</td>
</tr>
</table>
</form>
</body>
</html>
LoginForm.java
package com.javacrazyer.web.formbean;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
/**
* 用來收集用戶端送出資料.
* 要收集資料的屬性的名一定要跟請求參數名相同
*
*/
public class LoginForm extends ActionForm {
private static final long serialVersionUID = 6619272689058619128L;
private String loginname;
private String pwd;
@Override
public void reset(ActionMapping mapping, HttpServletRequest request) {
System.out.println("*******調用LoginForm的reset方法");
this.pwd = null;
this.loginname = null;
super.reset(mapping, request);
}
@Override
public ActionErrors validate(ActionMapping mapping,
HttpServletRequest request) {
System.out.println("調用LoginForm的validate方法------");
//如果本方法傳回null或ActionErrors中沒有存放任何對象，表示驗證通過。否則驗證失敗，跳轉到對應<action>元素中input屬性指定的URL
ActionErrors errors = new ActionErrors();
if(this.loginname == null || "".equals(this.loginname)){
ActionMessage msg = new ActionMessage("使用者名不能為空",false);
errors.add(ActionErrors.GLOBAL_MESSAGE, msg);
}
if(this.pwd == null || "".equals(this.pwd)){
ActionMessage msg = new ActionMessage("密碼不能為空",false);
errors.add(ActionErrors.GLOBAL_MESSAGE, msg);
}
return errors;
}
public LoginForm(){
System.out.println("調用預設構造方法建立出LoginForm的一個執行個體");
}
public String getLoginname() {
return loginname;
}
public void setLoginname(String loginname) {
this.loginname = loginname;
System.out.println("調用setLoginname()方法");
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
System.out.println("調用setPwd()方法");
}
}
WEB-INF/struts-config.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">
<struts-config>
<!-- ================================================ Form Bean Definitions -->
<form-beans>
<form-bean name="loginForm" type="com.javacrazyer.web.formbean.LoginForm"/>
<form-bean name="regForm" type="com.javacrazyer.web.formbean.RegisterForm"/>
</form-beans>
<!-- =========================================== Action Mapping Definitions -->
<action-mappings>
<action path="/login" name="loginForm" type="com.javacrazyer.web.action.LoginAction" validate="true"
input="/index.jsp">
<forward name="succ" path="/login_success.jsp"/>
<forward name="failure" path="/login_failure.jsp"/>
</action>
</action-mappings>
</struts-config>
這裡的示例就不要用到validator.xml和validator-rules.xml了，也不需要資源檔案
關于web.xml的配置、LoginAction和其他JSP頁面都與第一篇文章中的一樣，這裡就不寫了，實作的效果也就是第一篇文章中所展示的效果
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