扎心了，老铁~这依然是一个注册。
1、reg.jsp
<%@page contentType="text/html; charset=utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><head><title>新用户注册</title><script src="js/jquery-1.8.1.js"></script><script> ???$(function(){ ?????$("#account").blur(function(){ ??????$.ajax({ ??????????url:"userManager_checkUserIsRegist", //请求的URL路径 ???????type: "post", ?//请求方法 ???????data:"account="+$("#account").val(),//获取文本框输入的文本值 ???????dataType:"json",//返回json的数据格式 ???????success:function(data){//操作成功后执行的回调函数 ???????????//alert(data); ???????????//循环遍历data集合 ???????????//{"errorMsg":"对不起该账号已经被注册"} ???????????$.each(data, function (key, value) { ??????????????????alert(value); ???????????}); ????????} ??????}); ???????????????}); ???});</script></head><body> ?<form ?action="userManager_checkUserIsRegist"> ???????用户帐号:<input name="textfield" type="text" id="account" name="account"/> ????????????用户密码:<input name="textfield" type="text" /> ?</form></body></html>2、UserManagerAction.java
package com.cn.action;public class UserManagerAction { ???private ?String ?account; ???private ?String ?errorMsg; ???????public ?String ?checkUserIsRegist(){ ???????????????String[] registAccount={"aa","bb","cc","dd"}; ???????for(String act:registAccount){ ???????????if(act.equals(account)){ ???????????????errorMsg="对不起该账号已经被注册"; ???????????????break; ???????????}else{ ???????????????errorMsg="恭喜您该账号可以使用"; ???????????} ???????} ???????return "regist"; ???} ???????public String ?getAccount(){ ???????????????return ?account; ???} ???????public void ?setAccount(String account){ ???????????????this.account=account; ???} ???public String getErrorMsg() { ???????return errorMsg; ???}}3、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> ???<constant name="struts.enable.DynamicMethodInvocation" value="true"/> ???<package name="jsonPlugin" namespace="/" extends="json-default"> ??????????????<action name="userManager_*" class="com.cn.action.UserManagerAction" method="{1}"> ?????????<!--返回类型必须为json--> ??????????<result type="json" name="regist"> ????????????<!--Action中哪些属性需要转换成JSON数据格式--> ??????????????<param name="includeProperties">errorMsg</param> ???????????</result> ??????</action> ???</package> ???????<package name="jfreechartPlugin" namespace="/" extends="jfreechart-default"> ??????????????<action name="jFreeChart_*" class="com.cn.action.JFreeChartAction" method="{1}"> ??????????<result name="success" type="chart"> ??????????????<!--定义JFreeChart报表的大小--> ??????????????<param name="width">800</param> ??????????????<param name="height">600</param> ??????????</result> ??????</action> ??????????</package></struts>4、web.xml
<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" ????xmlns="http://java.sun.com/xml/ns/javaee" ????xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ????xsi:schemaLocation="http://java.sun.com/xml/ns/javaee ????http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> ?<welcome-file-list> ???<welcome-file>index.jsp</welcome-file> ?</welcome-file-list> ???<filter> ?????<filter-name>struts2</filter-name> ?????<filter-class> ?????????org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter ?????</filter-class> ?</filter> ?<filter-mapping> ?????<filter-name>struts2</filter-name> ?????<url-pattern>/*</url-pattern> ?</filter-mapping> ?</web-app>
Struts2的JSON插件
原文地址：http://www.cnblogs.com/Vito-Yan/p/7435666.html