Struts2+JSON+JQuery实现简单验证 博客分类： s2sh s2sh
程序员文章站
2024-02-16 22:01:04
...
刚学的东东，搞了很久的一个小成果，在此与大家分享。。。
1.创建struts_JSON项目，加入struts2所需的六个包，分别为：commons-fileupload-1.2.1.jar， commons-io-1.3.2.jar， freemarker-2.3.15.jar ， ognl-2.7.3.jar， struts2-core-2.1.8.1.jar ， xwork-core-2.1.6.jar 。
2.创建web.xml 和 struts.xml 代码分别如下：
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">
<display-name>Struts JSON</display-name>
<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>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<!--
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="false" />
<include file="example.xml"/>
<package name="default" namespace="/" extends="struts-default">
<default-action-ref name="index" />
<action name="index">
<result type="redirectAction">
<param name="actionName">HelloWorld</param>
<param name="namespace">/example</param>
</result>
</action>
</package>
-->
<!-- Add packages here -->
<constant name="struts.enable.DynamicMethodInvocation" value="true" />
<constant name="struts.devMode" value="true" />
<constant name="struts.i18n.encoding" value="UTF-8"></constant>
<package name="json test" namespace="/" extends="json-default">
<default-action-ref name="login"></default-action-ref>
<action name="login" class="com.action.LoginAction">
<result type="json">
<param name="root">tip</param>
</result>
</action>
</package>
</struts>
3.加入JSON 所需的包共七个包,都是可以在struts-2.1.8.1\lib 目录下可以找得到的，他们分别为：json-lib-2.1.jar， struts2-json-plugin-2.1.8.1.jar，（这两个是JSON所必须的包） ezmorph-1.0.3.jar， commons-collections-3.2.jar， commons-beanutils-1.7.0.jar， commons-logging-1.0.4.jar， commons-lang-2.3.jar 。（因为json大量引用了Apache commons的包，所以需要引入commons的四个包。）
4.创建model ：User.java
package com.model;
public class User {
private String username="";
private String password="";
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;
}
}
5.创建action： LoginAction.java:
package com.action;
import java.net.URLDecoder;
import java.util.HashMap;
import java.util.Map;
import net.sf.json.JSONObject;
import com.model.User;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class LoginAction extends ActionSupport {
User user;
private String tip="";
public String execute() throws Exception {
String username=user.getUsername();
String password=user.getPassword();
username=URLDecoder.decode(username, "utf-8"); //中文传参处理
System.out.println("Username:"+username+" , Password:"+password); //测试运行进度
Map<String,String> map=new HashMap<String,String>();
map.put("username", username);
JSONObject jo=JSONObject.fromObject(map);
tip=jo.toString();
System.out.println("Get Tips:"+tip);
return SUCCESS;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public String getTip() {
return tip;
}
public void setTip(String tip) {
this.tip = tip;
}
}
6.创建View login.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>Struts2+jQuery+JSON 登陆验证</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<style type="text/css">
.decorate{ /*控制文本框样式*/
border:1px solid #F00;
background:url(images/text_bg.gif) repeat-x;;
background-position:bottom;
}
</style>
<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>
<script type="text/javascript">
$(function(){
//var username=$("#username"); //抓取对象
//var password=$("#password");
$("#validate").click(function(){
var username=$("#username").val(); //只能使用在jQuery 函数的里面
var password=$("#password").val();
if(username==""||password==""){
alert("用户名或密码不能为空！");
}else{
var url="login?user.username="+encodeURI(encodeURI(username))+"&user.password="+encodeURI(encodeURI(password));
$.getJSON(url,null,function(data){
// convert to json object
//alert(data);
var message=eval("("+data+")");
$("#tip").html("欢迎您！"+message.username);
});
}
});
$("#username").keyup(function(){
var username=$("#username").val();
if(username==""){
$("#username").addClass("decorate");
}else{
$("#username").removeClass("decorate");
}
});
$("#password").keyup(function(){
var password=$("#password").val();
if(password==""){
$("#password").addClass("decorate");
}else{
$("#password").removeClass("decorate");
}
});
});
</script>
</head>
<body>
<div id="tip" style="color:#F00; font-weight:bold; "></div>
<fieldset style="width:600px; ">
<legend>用户登录</legend>
<p align="center">账号：<input type="text" name="user.username" id="username" class="decorate" /></p>
<p align="center">密码：<input type="password" name="user.password" id="password" class="decorate" /></p>
<p align="center"><input type="submit" id="validate" name="validate" value="确定" /></p>
</fieldset>
</body>
</html>
（注：这里引入了jquery-1.4.2.min.js 的JS插件，同时在body中，不可以在加上 form的标签，否则，在“tip”中不能正常显示，而且也返回不了数据疑问中？？？是不是jQuery的作用？？？？？。。。也希望各位多多指教..非常感谢..小弟在此露脸了......）