struts2中validate的用法，struts2validate
package com.test.action;import com.opensymphony.xwork2.ActionSupport;import com.test.model.User;public class CheckUser extends ActionSupport{/** * */private static final long serialVersionUID = 1L;private User user=new User();private String username;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;}private String password;@Overridepublic String execute() throws Exception {System.out.println("checkuser");// TODO Auto-generated method stubreturn SUCCESS;}/*注意，validate方法是在execute之前執行*/@Overridepublic void validate() {user.setUsername(this.getUsername());user.setPassword(this.getPassword());System.out.println(user);// TODO Auto-generated method stubif(user.getUsername().equals("admin")){this.addFieldError("username_error", "許可權不夠");}super.validate();}}
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> <!-- 採用註解的方式 --> <constant name="struts.enable.DynamicMethodInvocation" value="true" /> <constant name="struts.devMode" value="true" /> <package name="default" namespace="" extends="struts-default"> <!-- struts2捕獲action類異常 --> <!-- <global-results><result name="error">/error.jsp</result></global-results><global-exception-mappings><exception-mapping result="error" exception="java.lang.Exception"></exception-mapping></global-exception-mappings> --> <action name="link" class="com.test.action.LoginAction"> <result>/result.jsp</result> </action> <action name="linkIOC" class="com.test.action.LoginActionIOC"> <result>/result.jsp</result> </action> <!-- 正確和錯誤的分別跳轉，齊總input是在驗證失敗後會跳轉的頁面 --> <action name="data" class="com.test.action.CheckUser"> <result name="success">/result.jsp</result> <result name="input">/login.jsp</result> </action> </package> <!-- Add packages here --></struts>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib uri="/struts-tags" prefix="s"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><!-- 這個地方是用來顯示錯誤資訊 --><s:fielderror/><form action="data.action" method="post"><input type="text" name="username"><br><input type="password" name="password"><br><input type="submit" name="ok"><br></form></body></html>
即當嚴重不通過後，會返回到該頁面，同時輸出出錯資訊。
測試結果，當輸入admin之後，會發現如下的頁面
你用字串接受參數，然後轉換成Double類型，看看出不出異常，出異常表明不是數字。
或者直接用Regex驗證。或者乾脆直接在前台驗證，或者用struts2提供的驗證架構來驗證。
對於struts2中的validate
添加的錯誤資訊都在當前的Action對象上吧
在validate一般都是用this.addFieldError()這個方法嗎，thiis就是當前Action對象
除了用標籤，還可以用EL運算式等取，比如：${errors['錯誤欄位名']}，這個可以指定取出哪個錯誤訊息
最後對於INPUT，在別的頁面也能取出來，這個可能是Struts2的一種機制吧，後台Action對象傳給前台頁面
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