《struts---利用struts的标签，实现简单的表单提交及校验》
部分不重要的代码，未复制！
<!--注册页面--><%@ page language="java" pageEncoding="UTF-8"%><%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%> <%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%> <html> <head><title>用户注册</title></head><body><!-- 这里用的是struts的标签，它给我们提供了很多的便利 --><html:form action="/UserMain">姓名 : <html:text property="name"/><html:errors property="name"/><br/><!-- 在回显时，为了数据安全就将密码清空了，只需将其value值设为""即可 -->密码 : <html:password property="password" value=""/><html:errors property="password"/><br/>确认密码 : <html:password property="password2" value=""/><html:errors property="password2"/><br/><html:submit value="提交"/></html:form></body></html>
//用于储存用户信息的FormBean/* * Generated by MyEclipse Struts * Template path: templates/java/JavaClass.vtl */package com.fenghuo.struts.web.forms;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;/** * MyEclipse Struts * Creation date: 10-07-2012 * * XDoclet definition: * @struts.form name="userForm" */public class UserForm extends ActionForm {/** * */private static final long serialVersionUID = 8184190723003145234L;/** password2 property */private String password2;/** name property */private String name;/** password property */private String password;/* * Generated Methods *//** * Method validate * @param mapping * @param request * @return ActionErrors */public ActionErrors validate(ActionMapping mapping,HttpServletRequest request) {ActionErrors errors = new ActionErrors();if (!password.equals(password2)){errors.add("password", new ActionMessage("<font color='red'>密码不相同</font>", false));}if(name.equals("") || name == null){errors.add("name", new ActionMessage("<font color='red'>用户名不能为空</font>", false));}return errors;}/** * Method reset * @param mapping * @param request */public void reset(ActionMapping mapping, HttpServletRequest request) {// TODO Auto-generated method stub}/** * Returns the password2. * @return String */public String getPassword2() {return password2;}/** * Set the password2. * @param password2 The password2 to set */public void setPassword2(String password2) {this.password2 = password2;}/** * Returns the name. * @return String */public String getName() {return name;}/** * Set the name. * @param name The name to set */public void setName(String name) {this.name = name;}/** * Returns the password. * @return String */public String getPassword() {return password;}/** * Set the password. * @param password The password to set */public void setPassword(String password) {this.password = password;}}//注册成功进行跳转的action/* * Generated by MyEclipse Struts * Template path: templates/java/JavaClass.vtl */package com.fenghuo.struts.web.actions;import java.io.UnsupportedEncodingException;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 com.fenghuo.struts.web.forms.UserForm;/** * MyEclipse Struts * Creation date: 10-07-2012 * * XDoclet definition: * @struts.action path="/UserRegister" name="userForm" scope="request" validate="true" * @struts.action-forward name="main.jsp" path="/WEB-INF/jsp/main.jsp" redirect="true" */public class UserMain extends Action {/* * Generated Methods *//** * Method execute * @param mapping * @param form * @param request * @param response * @return ActionForward */public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response) {return mapping.findForward("success");}}<!--主页面--><%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>主界面</title> </head> <body> <br> ${userForm.name }欢迎来到主界面！ </body></html><!--struts-config.xml--><?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="userForm" type="com.fenghuo.struts.web.forms.UserForm" /> </form-beans> <global-exceptions /> <global-forwards /> <action-mappings> <!--注释部分内容用不到<action path="/Test" type="com.fenghuo.struts.test.Test"><forward name="success" path="/WEB-INF/jsp/test.jsp"></forward></action>--> <action attribute="userForm" name="userForm" path="/UserMain" scope="request" type="com.fenghuo.struts.web.actions.UserMain" input="/WEB-INF/jsp/register.jsp"> <set-property property="cancellable" value="true" /> <forward name="success" path="/WEB-INF/jsp/main.jsp"/> </action> <action path="/UserRegUI" type="com.fenghuo.struts.web.actions.UserRegUI"> <set-property property="cancellable" value="true" /> <forward name="success" path="/WEB-INF/jsp/register.jsp" /> </action> </action-mappings> <!-- <message-resources parameter="com.fenghuo.ApplicationResources" /> --></struts-config>
1.用户名为空时报错，返回注册页面
2.密码不相同是报错，返回。用户名回显。
3.用户名为空，且密码不相同。
4.注册，登陆成功。
在struts中，将数据封装成FormBean时会调用里面的validate方法，因此可以将数据的校验。放在这个方法中。这个方法会返回错误，我们可以用struts提供的标签显示相应的错误。FormBean会自动封装。默认存放到Session域中。