js和ssh实现判断用户名重复实例
本博客讲述如何利用js+ssh2实现重命名的判断，希望读者看完了博客能够将这个简单的小功能实现了。
首先建立一个添加系统的一个页面：
<%@ page contentType="text/html;charset=utf-8" language="java"
import="java.sql.*" errorPage=""%>
<%
Stringpath = request.getContextPath();
StringbasePath = request.getScheme() + "://"
+request.getServerName() + ":" + request.getServerPort()
+path + "/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTDXHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<base href="<%=basePath%>"/>
<meta http-equiv="Content-Type"content="text/html; charset=utf-8" />
<title>权限管理</title>
<link href="<%=basePath%>css/basePage.css"rel="stylesheet"
type="text/css" />
<link href="<%=basePath%>css/baseStyle.css"rel="stylesheet"
type="text/css" />
<link rel="stylesheet"type="text/css"
href="<%=basePath%>css/addccStyle.css" />
<script src="<%=basePath%>/js/client_validate.js"type="text/javascript"></script>
<script language="javascript"type="text/javascript">
function menu_click(page){
window.self.location= '<%=basePath%>' + page;
}
function _addbtn(){
var systemName =document.getElementById("systemName");
if (trim(systemName.value) == "") {
alert("系统名称名称不能为空！");
systemName.focus();
return;
}
var myForm =document.forms[0];
myForm.action= "webSystemManager!addWebSystem";
myForm.submit();
}
function _goback(){
window.self.location= "<%=basePath%>permission/sysmgr/system_add.jsp";
}
function init() {
var systemName =document.getElementById("systemName");
var s = '<%=request.getAttribute("system_isExist")%>';
if(s == "1"){
alert("该系统已经存在！");
systemName.focus();
systemName.value="";
return;
}
var res = "<%=request.getAttribute("addRes")%>";
if(res == 1){
alert("添加成功！");
systemName.focus();
systemName.value="";
return;
}
systemName.focus();
}
</script>
</head>
<body menu='menu' onload="init()">
<div class="header">
<div class="header03"></div>
<div class="header01"></div>
<div class="header02">权限管理系统</div>
</div>
<div class="left" id="LeftBox">
<div class="left01">
<div class="left01_right"></div>
<div class="left01_left"></div>
<div class="left01_c">超级管理员：admin</div>
</div>
<div class="left02">
<div class="left02top">
<div class="left02top_right"></div>
<div class="left02top_left"></div>
<div class="left02top_c">基本信息维护</div>
</div>
<div class="left02down">
<div class="left02down01"
onclick="menu_click('permission/usermgr/role_maint.jsp')">角色管理</div>
<div class="left02down01"
onclick="menu_click('permission/usermgr/group_maint.jsp')">用户组管理</div>
<div class="left02down01"
onclick="menu_click('permission/usermgr/user_maint.jsp')">用户管理</div>
</div>
<div class="left02top">
<div class="left02top_right"></div>
<div class="left02top_left"></div>
<div class="left02top_c">授权维护</div>
</div>
<div class="left02down">
<div class="left02down01"
onclick="menu_click('permission/authoriedmgr/role_authoried_maint.jsp')">角色权限管理</div>
<div class="left02down01"
onclick="menu_click('permission/authoriedmgr/group_authoried_maint.jsp')">用户组权限管理</div>
<div class="left02down01"
onclick="menu_click('permission/authoriedmgr/user_authoried_maint.jsp')">用户权限管理</div>
</div>
<div class="left02top">
<div class="left02top_right"></div>
<div class="left02top_left"></div>
<div class="left02top_c">系统维护</div>
</div>
<div class="left02down" id="leftlast">
<div class="left02down01"
onclick="menu_click('webSystemManager!getWebSystemByQueryString?pageNo=1&queryString=null')">系统管理</div>
<div class="left02down01"
onclick="menu_click('webPageManager!getWebPageByQueryString?pageNo=1&queryString=null')">页面管理</div>
<div class="left02down01"
onclick="menu_click('moduleManager!getModuleByQueryString?pageNo=1&queryString=null')">模块管理</div>
<div class="left02down01"
onclick="menu_click('operateManager!getOperateByQueryString?pageNo=1&queryString=null')">操作管理</div>
</div>
<div class="left03 left02top">
<div class="left03_right"></div>
<div class="left01_left"></div>
<div class="left03_c">安全退出</div>
</div>
</div>
</div>
<form id="addsystemform" method="post">
<div id="RightBox">
<div id="permission_header">
<div id="permission_guid"> 系统维护>>添加系统</div>
<div id="split_line">
<hr />
</div>
</div>
<div id="operation_main">
<div id="select_guid">添加系统</div>
<div id="prompt_select">
<span id="span_prompt">第二步（共两步）：</span>添加系统信息
</div>
<div id="select_mothed">
<div class="guid_cc">
系统名称：<input type="text" id="systemName" name="webSystem.name"/>
</div>
</div>
<div id="btn_next">
<input type="button" class="operation_btn"name="btnReturn"
id="btnReturn" value="返回" onclick="_goback()" /> <input
type="button" class="operation_btn"name="btnAdd" id="btnAdd"
value="添加" onclick="_addbtn()" />
</div>
</div>
<div id="permission_footer">
<div id="inner_footer">
<p class="copyright">Copyright © 2012 ××××××.</p>
</div>
</div>
</div>
</form>
</body>
</html>
之后建立相应的Action：
public classWebSystemManagerAction extends ActionSupport {
private WebSystem webSystem;
@Resource
privateIWebSystemManager<Long> webSystemManager;
private HttpServletRequest request;
private StringBuffer sbTreeHTML = new StringBuffer();
public WebSystemgetWebSystem() {
return webSystem;
}
public void setWebSystem(WebSystemwebSystem) {
this.webSystem = webSystem;
}
/**
* 添加系统信息
* @return
* @throws Exception
*/
public String addWebSystem() throws Exception {
//先查找是否存在
int res = 0;
res= webSystemManager.getWebSystemNameIsExist(webSystem.getName());
request = ServletActionContext.getRequest();
//若存在，group_isExist为1，若不存在group_isExist为0
request.setAttribute("system_isExist","0");
request.setAttribute("addRes",0);
if(res > 0){
request.setAttribute("system_isExist","1");
}else{
webSystemManager.saveWebSystem(webSystem);
request.setAttribute("addRes",1);
}
return "webSystemAdd";
}
bll层代码（这里仅仅写实现了）：
@Override
public intgetWebSystemNameIsExist(String webSystemName) {
int res = 0;
WebSystemwebSystem = webSystemDao.findWebSystemByName(webSystemName);
if(!BeanUtil.isNull(webSystem)){
res= 1;
}
return res;
}
Dao层代码（这里也仅仅写实现）：
@Override
public WebSystemfindWebSystemByName(String webSystemName) {
baseDao.clearBaseDao(baseDao);
baseDao.setEntityClass(WebSystem.class);
Stringhql = "from WebSystem a where a.name=?";
IQueryquery = baseDao.createQuery();
query.setQueryString(hql);
query.setParamValues(new Object[]{webSystemName});
WebSystemwebSystem=null;
if(baseDao.find(query).size()>0 ){
webSystem= (WebSystem)baseDao.find(query).get(0);
}
return webSystem;
}
之后配置相关信息：
Bll层配置：
<bean id="webSystemManager" class="com.core.permission.impl.WebSystemManagerImpl"></bean>
Dao层配置：
<bean id="webSystemDao" class="com.core.permission.dao.impl.WebSystemDaoImpl"></bean>
Action配置：
<beanname="webSystemManagerAction" class="com.web.action.WebSystemManagerAction"scope="prototype"></bean>
最后就是struts2的相关配置：
<action name="webSystemManager" class="webSystemManagerAction">
<result name="webSystemAdd">/permission/sysmgr/system_add_addsystem.jsp</result>
</action>
运行结果：
1：
2：
3：
通过这个小实例，相信大家一定会利用js+ssh2实现重命名的判断了，其实懂了这个其他的判断都会非常简单。其实最主要还是在那个init方法上，细心的读者会发现那个init方法的妙处。