前端验证

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Login1.sjp

<%@ page language="java" pageEncoding="gb2312"%>

<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean"%>

<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html"%>

<html>

<head>

<title>JSP for LoginForm form</title>

</head>

<body>

<html:form action="/login">

<bean:message key="info.input" arg0="account"/>

<html:text property="account"/><html:errors property="account"/>

<br/>

<bean:message key="info.input" arg0="password"/>

<html:password property="password"/><html:errors property="password"/>

<br/>

<html:submit/><html:cancel/>

</html:form><HR>

<html:errors property="login"/>

</body>

</html>

====================================

<%@ page language="java" pageEncoding="gb2312"%>

<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean"%>

<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html"%>

<html>

<head>

<title>JSP for LoginForm form</title>

</head>

<body>

普通方法：

<html:form action="/login">

Please input account : <html:text property="account"/><br/>

Please input password : <html:password property="password"/><br/>

<html:submit/><html:cancel/>

</html:form><HR>

用到资源文件方法：

<html:form action="/login">

<bean:message key="info.input.account"/> <html:text property="account"/><br/>

<bean:message key="info.input.password"/> <html:password property="password"/><br/>

<html:submit/><html:cancel/>

</html:form><HR>

用到资源文件,传参数方法：

<html:form action="/login">

<bean:message key="info.input" arg0="account"/> <html:text property="account"/><br/>

<bean:message key="info.input" arg0="password"/> <html:password property="password"/><br/>

<html:submit/><html:cancel/>

</html:form><HR>

用到资源文件,传参数，用中文：

<html:form action="/login">

<bean:message key="info.input" arg0="账号" bundle="CH"/> <html:text property="account"/><br/>

<bean:message key="info.input" arg0="密码" bundle="CH"/> <html:password property="password"/><br/>

<html:submit/><html:cancel/>

</html:form><HR>

</body>

</html>

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LoginForm.java

package prj7_1.form;

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;

public class LoginForm extends ActionForm {

private String password;

private String account;

//validate函数里面进行前端错误验证

public ActionErrors validate(ActionMapping mapping,

HttpServletRequest request) {

ActionErrors errors = new ActionErrors();//错误集合，专门容纳ActionError,当内部有ActionMessage时，认为发生了前端错误

if(account.length()==0){//账号为空

ActionMessage error = new ActionMessage("error.null","account");//第一个参数是消息内容key,第二个参数是取代{0}的值

errors.add("account",error);//第一个参数是对这个error加一个属性标记

}

else if(account.length()>10 || account.length()<6 ){//账号长度不对

ActionMessage error = new ActionMessage("error.length","account","6","10");

errors.add("account",error);

}

if(password.length()==0){//账号为空

ActionMessage error = new ActionMessage("error.null","password");//第一个参数是消息内容key,第二个参数是取代{0}的值

errors.add("password",error);//第一个参数是对这个error加一个属性标记

}

else if(password.length()>10 || password.length()<6 ){//账号长度不对

ActionMessage error = new ActionMessage("error.length","password","6","10");

errors.add("password",error);

}

return errors;

}

public void reset(ActionMapping mapping, HttpServletRequest request) {

// TODO Auto-generated method stub

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public String getAccount() {

return account;

}

public void setAccount(String account) {

this.account = account;

}

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LoginAction.java

package prj7_1.action;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.action.ActionMessage;

import org.apache.struts.action.ActionMessages;

import prj7_1.form.LoginForm;

public class LoginAction extends Action {

public ActionForward execute(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response) {

LoginForm loginForm = (LoginForm) form;// TODO Auto-generated method stub

String account = loginForm.getAccount();

if(account.equals("JohnKate")){

ActionMessages errors = new ActionMessages();

ActionMessage error = new ActionMessage("error.login",account);

errors.add("login",error);//第一个参数是对这个error加一个属性标记

this.saveErrors(request, errors); //将errors保存起来

return mapping.getInputForward();

}

return null;

}

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Struts-config.xm

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">

<struts-config>

<data-sources />

<form-beans >

<form-bean name="loginForm" type="prj7_1.form.LoginForm" />

</form-beans>

<global-exceptions />

<global-forwards />

<action-mappings >

<action

input="/login1.jsp"

name="loginForm"

path="/login"

type="prj7_1.action.LoginAction" />

</action-mappings>

<message-resources parameter="prj7_1.ApplicationResources" />

<message-resources key="CH" parameter="prj7_1.ApplicationCHResources"></message-resources>

</struts-config>

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ApplicationCHResources.properties

info.input=<font color=red>/u8bf7/u60a8/u8f93/u5165 {0} :</font>

===========================================

ApplicationResources.properties

# 这是资源文件:格式：key=value形式

info.input.account=Please input account :

info.input.password=Please input password :

#可以传参数，参数用{0},...{4}表示

info.input=<font color=red>Please input {0} :</font>

error.null={0} cannot be null!

error.length=length of {0} must between {1} and {2}!

error.login={0} is in black list!!