注：本文代码是在Github上找到的源码，在此基础上进行了修改。
表单验证的功能是通过JS代码实现的，在作者的验证JS代码中有已经设定好的数据格式，使用的是正则表达式，如果你想要设置自己的数据格式，可以在js文件最后找到datatype进行修改。作者的后端代码使用的是php，我修改为JAVA，这不影响前端页面。
整个代码框架是JSP+Servlet，前端页面的表单审核通过后才可以提交，将数据传输到后端进行处理，比如存到数据库等。
我这里的表单是一个注册会议模块，其实登录或者注册道理都一样，但是样式上可能不太好看，之前有尝试使用Bootstap Validator但是因效果出不来，就放弃了，使用BV样式会更好看一些。
JSP页面
<body>
<form class="registerform" action="servlet/Register" method="post">
<table width="100%" style="table-layout:fixed;">
<tr>
<td class="need" style="width:10px;">*</td>
<td style="width:100px;">用户名：</td>
<td style="width:235px;">
<input type="text" name="name" class="inputxt" datatype="s2-4" nullmsg="请输入用户名！" errormsg="请输入姓名！" /></td>
<td><div class="Validform_checktip">请输入真实姓名！</div></td>
</tr>
<tr>
<td class="need">*</td>
<td>性别：</td>
<td>
<input type="radio" value="1" name="gender" id="male" class="pr1" datatype="radio" errormsg="请选择性别！" />
<label for="male">男</label>
<input type="radio" value="2" name="gender" id="female" class="pr1" />
<label for="female">女</label>
</td>
<td><div class="Validform_checktip"></div></td>
</tr>
<tr>
<td class="need" style="width:10px;">*</td>
<td>手机：</td>
<td>
<input type="text" name="telephone" class="inputxt" datatype="s11" nullmsg="请输入手机号！" errormsg="请输入正确格式的手机号！" />
</td>
<td><div class="Validform_checktip">请输入11位手机号码！</div></td>
</tr>
<tr>
<td class="need" style="width:10px;">*</td>
<td>座机：</td>
<td>
<input type="text" name="landline" class="inputxt" datatype="line" nullmsg="请输入座机号！" errormsg="请输入正确格式的座机号！" />
</td>
<td><div class="Validform_checktip">请输入座机 以（ 区号-号码） 的格式</div></td>
</tr>
<tr>
<td class="need" style="width:10px;">*</td>
<td>邮箱：</td>
<td>
<input type="text" name="email" id="email" value="${requestScope.reginfo.political}" class="inputxt" datatype="e" nullmsg="请输入邮箱！" errormsg="请输入正确格式的邮箱！" />
</td>
<td><div class="Validform_checktip">请输入常用的邮箱</div></td>
</tr>
<tr>
<td class="need" style="width:10px;">*</td>
<td>地址：</td>
<td>
<input type="text" name="address" class="inputxt" datatype="s2-20" nullmsg="请输入地址！" errormsg="请输入有效地址！" />
</td>
<td><div class="Validform_checktip">请输入现居住地址</div></td>
</tr>
<tr>
<td class="need" style="width:10px;">*</td>
<td>工作单位：</td>
<td>
<input type="text" name="work_place" class="inputxt" datatype="s2-20" nullmsg="请输入工作单位" />
</td>
<td><div class="Validform_checktip">请输入工作单位</div></td>
</tr>
<tr>
<td class="need" style="width:10px;">*</td>
<td>职位：</td>
<td>
<input type="text" name="work" class="inputxt" datatype="s2-10" nullmsg="请输入职位！" />
</td>
<td><div class="Validform_checktip">请输入当前职位</div></td>
</tr>
<tr>
<td class="need" style="width:10px;">*</td>
<td>职称：</td>
<td>
<input type="text" name="work_title" class="inputxt" datatype="s2-10" nullmsg="请输入职称！" />
</td>
<td><div class="Validform_checktip">请输入当前职称</div></td>
</tr>
<tr>
<td class="need" style="width:10px;">*</td>
<td>研究领域：</td>
<td>
<input type="text" name="work_space" class="inputxt" datatype="s2-20" nullmsg="请输入研究领域！" />
</td>
<td><div class="Validform_checktip">请输入当前研究领域</div></td>
</tr>
<tr>
<td class="need" style="width:10px;">*</td>
<td>邮编：</td>
<td>
<input type="text" name="name" class="inputxt" datatype="postcode" nullmsg="请输入邮编！" errormsg="请输入有效邮编！" />
</td>
<td><div class="Validform_checktip">请输入邮编</div></td>
</tr>
<tr>
<td class="need">*</td>
<td>是否住宿：</td>
<td>
<input type="radio" value="1" name="hotel" class="pr1" datatype="radio" errormsg="请选择！" />
<label for="yes">是</label>
<input type="radio" value="2" name="hotel" class="pr1" />
<label for="no">否</label>
</td>
<td><div class="Validform_checktip"></div></td>
</tr>
<tr>
<td class="need">*</td>
<td>是否合住：</td>
<td>
<input type="radio" value="1" name="mate_plus" class="pr1" datatype="radio" errormsg="请选择！" />
<label for="yes">是</label>
<input type="radio" value="2" name="mate_plus" class="pr1" />
<label for="no">否</label>
</td>
<td><div class="Validform_checktip"></div></td>
</tr>
<tr>
<td class="need" style="width:10px;">*</td>
<td>发票抬头：</td>
<td>
<input type="text" name="invoice" class="inputxt" datatype="s1-20" nullmsg="请输入发票抬头！" />
</td>
<td><div class="Validform_checktip">请输入发票抬头</div></td>
</tr>
<tr>
<td class="need" style="width:10px;">*</td>
<td>税号：</td>
<td>
<input type="text" name="tax" class="inputxt" datatype="s1-20" nullmsg="请输入税号！" errormsg="昵称至少6个字符,最多18个字符！" /></td>
<td><div class="Validform_checktip">请输入税号！</div></td>
</tr>
<tr>
<td class="need" style="width:10px;">*</td>
<td>汇款金额：</td>
<td>
<input type="text" name="money" class="inputxt" datatype="s1-15" nullmsg="请输入汇款金额！" errormsg="请输入汇款金额！" /></td>
<td><div class="Validform_checktip">请输入汇款金额！</div></td>
</tr>
<tr>
<td class="need" style="width:10px;">*</td>
<td>备注：</td>
<td><input type="text" name="name" class="inputxt" datatype="s1-25" nullmsg="请输入备注！" errormsg="请输入备注！" /></td>
<td><div class="Validform_checktip">请输入备注！</div></td>
</tr>
<tr>
<td colspan="4">
<input type="submit" value="保存" class="button" />
</td>
</tr>
</table>
</form>
<script type="text/javascript" src="js/jquery-1.4.1.min.js"></script>
<script type="text/javascript" src="js/Validform.js"></script>
<script type="text/javascript">
$(function(){
$(".registerform").Validform({
tiptype:2,
ajaxPost:true,
});
});
</script>
</body>
Servlet后端
#这里只获取了一个name值示例
#注意不设置编码中文输入下会出现乱码
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
String name = request.getParameter("name");
System.out.println(name);
}
注意web xml文件里面配置servlet的路径，而表单提交的时候路径是不加“/”的
<servlet>
<servlet-name>Register</servlet-name>
<servlet-class>servlet.Register</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Register</servlet-name>
<url-pattern>/servlet/Register</url-pattern>
</servlet-mapping>
JS Validation（关键代码）
/*
通用表单验证方法
Validform version 3.0
For more information, you can visit www.rjboy.cn
By sean during April 7, 2010 - July 30, 2011
Demo:
$(".demoform").Validform({//$(".demoform")指明是哪一表单需要验证,名称需加在form表单上;
btnSubmit:"#btn_sub", //#btn_sub是该表单下要绑定点击提交表单事件的按钮;如果form内含有submit按钮该参数可省略;
tiptype:1, //可选项 1=>pop box,2=>side tip，默认为1，也可以传入一个function函数，自定义提示信息的显示方式（可以实现你想要的任何效果，具体参见demo页）;
tipSweep:true,//可选项 true | false ，为true时提示信息将只会在表单提交时触发显示，各表单元素blur时不会被触发显示;
postonce:true, //可选项 是否开启网速慢时的二次提交防御，true开启，不填则默认关闭;
ajaxPost:true, //使用ajax方式提交表单数据，默认false，提交地址就是action指定地址;
datatype:{//传入自定义datatype类型;
"*6-20": /^[^\s]{6,20}$/,
"z2-4" : /^[\u4E00-\u9FA5\uf900-\ufa2d]{2,4}$/
},
callback:function(data){
//返回数据data是json格式，{"info":"demo info","status":"y"}
//info: 输出提示信息;
//status: 返回提交数据的状态,是否提交成功。如可以用"y"表示提交成功，"n"表示提交失败，在ajax_post.php文件返回数据里自定字符，主要用在callback函数里根据该值执行相应的回调操作;
//你也可以在ajax_post.php文件返回更多信息在这里获取，进行相应操作；
//这里执行回调操作;
//注意：如果不是ajax方式提交表单，传入callback表单将不会提交。在验证全部通过后会执行这个回调函数，这种情况data参数不可用。
}
});
*/
(function($){
var errorobj=null,//指示当前验证失败的表单元素;
msgobj,//pop box object
msghidden=true, //msgbox hidden?
tipmsg={//默认提示文字;
w:"请输入正确信息！",
r:"通过信息验证！",
c:"正在检测信息…",
s:"请填入信息！",
v:"所填信息没有经过验证，请稍后…",
p:"正在提交数据…",
err:"提交数据出错，请检查地址是否正确！"
},
creatMsgbox=function(){
if($("#Validform_msg").length!==0){return false;}
msgobj=$('<div id="Validform_msg"><div class="Validform_title">提示信息<a class="Validform_close" href="javascript:void(0);">χ</a></div><div class="Validform_info"></div><div class="iframe"><iframe frameborder="0" scrolling="no" height="100%" width="100%"></iframe></div></div>').appendTo("body");//提示信息框;
msgobj.find("a.Validform_close").click(function(){
msgobj.hide();
msghidden=true;
if(errorobj){
errorobj.focus().addClass("Validform_error");
}
return false;
}).focus(function(){this.blur();});
$(window).bind("scroll resize",function(){
if(!msghidden){
var left=($(window).width()-msgobj.width())/2,
top=($(window).height()-msgobj.height())/2,
topTo=(document.documentElement.scrollTop?document.documentElement.scrollTop:document.body.scrollTop)+(top>0?top:0);
msgobj.animate({
left : left,
top : topTo
},{ duration:400 , queue:false });
}
});
};
$.fn.Validform=function(settings){
var defaults={};
settings=$.extend({},$.fn.Validform.sn.defaults,settings);
settings.datatype && $.extend($.Datatype,settings.datatype);
this.each(function(){
var $this=$(this);
var posting=false; //防止表单按钮双击提交两次;
$this.find("[tip]").each(function(){//tip是表单元素的默认提示信息,这是点击清空效果;
var defaultvalue=$(this).attr("tip");
var altercss=$(this).attr("altercss");
$(this).focus(function(){
if($(this).val()==defaultvalue){
$(this).val('');
if(altercss){$(this).removeClass(altercss);}
}
}).blur(function(){
if($.trim($(this).val())===''){
$(this).val(defaultvalue);
if(altercss){$(this).addClass(altercss);}
}
});
});
//绑定blur事件;
$this.find("[datatype]").blur(function(){
var flag=true;
flag=$.fn.Validform.sn.checkform($(this),$this,{type:settings.tiptype,sweep:settings.tipSweep},"hide");
if(!flag){return false;}
if(typeof(flag)!="boolean"){//如果是radio, checkbox, select则不需再执行下面的代码;
$(this).removeClass("Validform_error");
return false;
}
flag=$.fn.Validform.sn.regcheck($(this).attr("datatype"),$(this).val());
if(!flag){
if($(this).attr("ignore")==="ignore" && ( $(this).val()==="" || $(this).val()===$(this).attr("tip") )){
if(settings.tiptype==2){
$(this).parent().next().find(".Validform_checktip").removeClass().addClass("Validform_checktip").text("");
}else if(typeof settings.tiptype == "function"){
(settings.tiptype)("",{obj:$(this),type:4},$.fn.Validform.sn.cssctl);
}
flag=true;
errorobj=null;
return true;
}
errorobj=$(this);
$.fn.Validform.sn.showmsg($(this).attr("errormsg")||tipmsg.w,settings.tiptype,{obj:$(this),sweep:settings.tipSweep},"hide"); //当tiptype=1的情况下，传入"hide"则让提示框不弹出,tiptype=2的情况下附加参数"hide"不起作用;
}else{
if($(this).attr("ajaxurl")){
var inputobj=$(this);
inputobj.attr("valid",tipmsg.c);
$.fn.Validform.sn.showmsg(tipmsg.c,settings.tiptype,{obj:inputobj,type:1,sweep:settings.tipSweep},"hide");
$.ajax({
type: "POST",
url: inputobj.attr("ajaxurl"),
data: "param="+$(this).val()+"&name="+$(this).attr("name"),
dataType: "text",
success: function(s){
if(s=="y"){
inputobj.attr("valid","true");
errorobj=null;
$.fn.Validform.sn.showmsg(tipmsg.r,settings.tiptype,{obj:inputobj,type:2,sweep:settings.tipSweep},"hide");
}else{
inputobj.attr("valid",s);
errorobj=inputobj;
$.fn.Validform.sn.showmsg(s,settings.tiptype,{obj:inputobj,sweep:settings.tipSweep});
}
},
error: function(){
inputobj.attr("valid",tipmsg.err);
errorobj=inputobj;
$.fn.Validform.sn.showmsg(tipmsg.err,settings.tiptype,{obj:inputobj,sweep:settings.tipSweep});
}
});
}else{
errorobj=null;
$.fn.Validform.sn.showmsg(tipmsg.r,settings.tiptype,{obj:$(this),type:2,sweep:settings.tipSweep},"hide");
}
}
});
$this.find(":checkbox[datatype],:radio[datatype]").each(function(){
var _this=$(this);
var name=_this.attr("name");
$this.find("[name="+name+"]").filter(":checkbox,:radio").not("[datatype]").bind("blur",function(){
_this.trigger("blur");
});
});
//subform
var subform=function(){
var flag=true;
if(posting){return false;}
$this.find("[datatype]").each(function(){
flag=$.fn.Validform.sn.checkform($(this),$this,{type:settings.tiptype,sweep:settings.tipSweep});
if(!flag){
errorobj.focus();
return false;
}
if(typeof(flag)!="boolean"){
flag=true;
return true;
}
flag=$.fn.Validform.sn.regcheck($(this).attr("datatype"),$(this).val());
if(!flag){
if($(this).attr("ignore")==="ignore" && ( $(this).val()==="" || $(this).val()===$(this).attr("tip") )){
flag=true;
errorobj=null;
return true;
}
errorobj=$(this);
errorobj.focus();
$.fn.Validform.sn.showmsg($(this).attr("errormsg")||tipmsg.w,settings.tiptype,{obj:$(this),sweep:settings.tipSweep});
return false;
}
if($(this).attr("ajaxurl")){
if($(this).attr("valid")!="true"){
flag=false;
var thisobj=$(this);
errorobj=thisobj;
errorobj.focus();
$.fn.Validform.sn.showmsg(thisobj.attr("valid") || tipmsg.v,settings.tiptype,{obj:thisobj,sweep:settings.tipSweep});
if(!msghidden || settings.tiptype!=1){
setTimeout(function(){
thisobj.trigger("blur");
},2000);
}
return false;
}else{
$.fn.Validform.sn.showmsg(tipmsg.r,settings.tiptype,{obj:$(this),type:2,sweep:settings.tipSweep},"hide");
flag=true;
}
}
});
if(flag && !posting){
errorobj=null;
if(settings.postonce){posting=true;}
if(settings.ajaxPost){
$.fn.Validform.sn.showmsg(tipmsg.p,settings.tiptype,{type:1,sweep:settings.tipSweep},"alwaysshow");//传入"alwaysshow"则让提示框不管当前tiptye为1还是2都弹出;
$.ajax({
type: "POST",
dataType:"json",
url: $this.attr("action"),
data: $this.serialize(),
success: function(data){
$.fn.Validform.sn.showmsg(data.info,settings.tiptype,{type:2,sweep:settings.tipSweep},"alwaysshow");
settings.callback && (settings.callback)(data);
},
error: function(){
$.fn.Validform.sn.showmsg(tipmsg.err,settings.tiptype,{type:3,sweep:settings.tipSweep},"alwaysshow");
}
});
return false;
}else{
settings.callback ? (settings.callback)() : $this.get(0).submit();
}
}
};
settings.btnSubmit && $this.find(settings.btnSubmit).bind("click",subform);
$this.submit(function(){
subform();
return false;
});
});
//预创建pop box;
if( settings.tiptype==1 || (settings.tiptype==2 && settings.ajaxPost) ){
creatMsgbox();
}
};
$.fn.Validform.sn={
defaults:{
tiptype:1,
tipSweep:false,
postonce:false,
ajaxPost:false
},
toString:Object.prototype.toString,
regcheck:function(type,gets){
if(!(type in $.Datatype)){
var mac=type.match($.Datatype["match"]),
temp;
reg:for(var name in $.Datatype){
temp=name.match($.Datatype["match"]);
if(!temp){continue reg;}
if(mac[1]===temp[1]){
var str=$.Datatype[name].toString();
var regxp=new RegExp("\\{"+temp[2]+","+temp[3]+"\\}");
str=str.replace(regxp,"{"+mac[2]+","+mac[3]+"}").replace(/^\//,"").replace(/\/$/,"");
$.Datatype[type]=new RegExp(str);
break reg;
}
}
}
if(this.toString.call($.Datatype[type])=="[object RegExp]"){
return $.Datatype[type].test(gets);
}
return false;
},
showmsg:function(msg,type,o,show){//o:{obj:当前对象, type:1=>正在检测 | 2=>通过}, show用来判断tiptype=1的情况下是否弹出信息框;
if(errorobj){errorobj.addClass("Validform_error");}
if(typeof type == "function"){
if(!(o.sweep && show=="hide")){
(type)(msg,o,this.cssctl);
}
return false;
}
if(type==1 || show=="alwaysshow"){
msgobj.find(".Validform_info").text(msg);
}
if(type==1 && show!="hide" || show=="alwaysshow"){
msghidden=false;
msgobj.find(".iframe").css("height",msgobj.height());
var left=($(window).width()-msgobj.width())/2;
var top=($(window).height()-msgobj.height())/2;
top=(document.documentElement.scrollTop?document.documentElement.scrollTop:document.body.scrollTop)+(top>0?top:0);
msgobj.css({
"left":left
}).show().animate({
top:top
},100);
}
if(type==2){
o.obj.parent().next().find(".Validform_checktip").text(msg);
this.cssctl(o.obj.parent().next().find(".Validform_checktip"),o.type);
}
},
checkform:function(obj,parentobj,tiptype,show){//show用来判断是表达提交还是blur事件引发的检测;
var errormsg=obj.attr("errormsg") || tipmsg.w,
inputname;
if(obj.is("[datatype='radio']")){ //判断radio表单元素;
inputname=obj.attr("name");
var radiovalue=parentobj.find(":radio[name="+inputname+"]:checked").val();
if(!radiovalue){
errorobj=obj;
this.showmsg(errormsg,tiptype.type,{obj:obj,sweep:tiptype.sweep},show);
return false;
}
errorobj=null;
this.showmsg(tipmsg.r,tiptype.type,{obj:obj,type:2,sweep:tiptype.sweep},"hide");
return "radio";
}
if(obj.is("[datatype='checkbox']")){ //判断checkbox表单元素;
inputname=obj.attr("name");
var checkboxvalue=parentobj.find(":checkbox[name="+inputname+"]:checked").val();
if(!checkboxvalue){
errorobj=obj;
this.showmsg(errormsg,tiptype.type,{obj:obj,sweep:tiptype.sweep},show);
return false;
}
errorobj=null;
this.showmsg(tipmsg.r,tiptype.type,{obj:obj,type:2,sweep:tiptype.sweep},"hide");
return "checkbox";
}
if(obj.is("[datatype='select']")){ //判断select表单元素;
if(!obj.val()){
errorobj=obj;
this.showmsg(errormsg,tiptype.type,{obj:obj,sweep:tiptype.sweep},show);
return false;
}
errorobj=null;
this.showmsg(tipmsg.r,tiptype.type,{obj:obj,type:2,sweep:tiptype.sweep},"hide");
return "select";
}
var defaultvalue=obj.attr("tip");
if((obj.val()==="" || obj.val()===defaultvalue) && obj.attr("ignore")!="ignore"){
errorobj=obj;
this.showmsg(obj.attr("nullmsg") || tipmsg.s,tiptype.type,{obj:obj,sweep:tiptype.sweep},show);
return false;
}
if(obj.attr("recheck")){
var theother=parentobj.find("input[name="+obj.attr("recheck")+"]:first");
if(obj.val()!=theother.val()){
errorobj=obj;
this.showmsg(errormsg,tiptype.type,{obj:obj,sweep:tiptype.sweep},show);
return false;
}
}
obj.removeClass("Validform_error");
errorobj=null;
return true;
},
cssctl:function(obj,status){
switch(status){
case 1:
obj.removeClass("Validform_right Validform_wrong").addClass("Validform_checktip Validform_loading");//checking;
break;
case 2:
obj.removeClass("Validform_wrong Validform_loading").addClass("Validform_checktip Validform_right");//passed;
break;
case 4:
obj.removeClass("Validform_right Validform_wrong Validform_loading").addClass("Validform_checktip");//for ignore;
break;
default:
obj.removeClass("Validform_right Validform_loading").addClass("Validform_checktip Validform_wrong");//wrong;
}
}
};
//公用方法显示&关闭信息提示框;
$.Showmsg=function(msg){
creatMsgbox();
$.fn.Validform.sn.showmsg(msg,1);
};
$.Hidemsg=function(){
msgobj.hide();
msghidden=true;
};
$.Datatype={
"match":/^(.+)(\d+)-(\d+)$/,
"*":/^[^\s]+$/,
"*6-16":/^[^\s]{6,16}$/,
"n":/^\d+$/,
"s":/^[\u4E00-\u9FA5\uf900-\ufa2d\w]+$/,
"s6-18":/^[\u4E00-\u9FA5\uf900-\ufa2d\w]{6,18}$/,
"p":/^[0-9]{6}$/,
"m":/^13[0-9]{9}$|15[0-9]{9}$|18[0-9]{9}$/,
"e":/^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/,
"s11": /^[0-9]{11}$/,
"line":/^(0[0-9]{2,3}\-)?([2-9][0-9]{6,7})$/,
"postcode":/^([0-9]{6})$/
};
})(jQuery);
效果图：
