Struts checks the input data

Last Update:2015-03-31 Source: Internet

Author: User

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When we are logged in or are required to register the user input data validation, before the browser to send data to the background, the background to verify the data, if there is an error with the error message forward with the login or registration page,

Struts makes it easy to verify the input data

First, let's start with a input.jsp. Used as login page below is the source code JS code is not optimized, if you feel uncomfortable, I hope you are very grateful

<%@ 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" >
<base href= "<%=basePath%>" >

<title>my JSP ' input.jsp ' starting page</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" >

<style type= "Text/css" >
*{
font-family: "Arial", "Microsoft Yahei", "Black Body", "Arial", Sans-serif;
}
. input{
border-width:0px;
Outline:none;
width:280px;
margin-left:10px;
height:36px;
Color: #888;
font-size:18px;

}
. lab{
Display:block;
height:36px;
width:300px;
Border:solid 1px #ccc;
position:relative;
}
#login {

Display:block;
Position:absolute;
width:302px;
height:38px;
Background-color: #1C86EE;
Margin-top: -20px;
Text-align:center;
line-height:36px;
size:21px;
Color: #FFF;
font-family: "Arial", "Microsoft Yahei", "Black Body", "Arial", Sans-serif;
Text-decoration:none;

}
#login: HOVER {

Background: #1E90FF;
}

span{

Position:absolute;
Float:left;
line-height:40px;
left:12px;
Color: #CDCDCD;
Cursor:text;
font-family: "Arial", "Microsoft Yahei", "Black Body", "Arial", Sans-serif;
font-size:18px;
}
</style>

<script type= "Text/javascript" >
First input box gets focus
function Change1 (INPUT1) {
Document.onkeydown = function () {

if (input1.value== "") {
document.getElementById ("Span1"). style.display= "Block";
}else{
document.getElementById ("Span1"). style.display= "None";
}
};
Document.onkeyup = function () {

if (input1.value== "") {
document.getElementById ("Span1"). style.display= "Block";
}else{
document.getElementById ("Span1"). style.display= "None";
}
};
}

function Change2 (INPUT1) {
Document.onkeydown = function () {

if (input1.value== "") {
document.getElementById ("Span2"). style.display= "Block";
}else{
document.getElementById ("Span2"). style.display= "None";
}
};
Document.onkeyup = function () {

if (input1.value== "") {
document.getElementById ("Span2"). style.display= "Block";
}else{
document.getElementById ("Span2"). style.display= "None";
}
};
}

</script>

<body>
<div style= "width:300px;height:200px;margin:50px auto;" >
<form action= "" method= "" id= "" Name= "" >
<label class= "Lab" id= "LAB1" >
<span id= "Span1" > Username/email account/Mobile phone number </span>
<input type= "text" name= "username" class= "input" id= "INPUT1" onfocus= "Change1 (This)" autocomplete= "Off"/>
</label><br/>
<label class= "Lab" id= "LAB2" >
<span id= "span2" > User password </span>
<input type= "Password" name= "Userpass" class= "input" id= "Input2" onfocus= "Change2 (This)"/>
</label><br/>
</form>
<a href= "#" id= "Login" > Login        record </a>
</div>

</body>

Run the following effect

Let's set up the action here.

Package com.day06;

public class Validate {

Private String username;
Private String Userpass;

public void Setusername (String username) {
This.username = Username;
}
public void Setuserpass (String userpass) {
This.userpass = Userpass;
}
Public String GetUserName () {
return this.username;
}
Public String Getuserpass () {
return this.userpass;
}

Public String Login () {
Return "Success";
}
}

Configure Struts.xml

<package name= "day06" namespace= "/day06" extends= "Struts-default" >
<action name= "Login" class= "com.day06.Validate" method= "Login" >
<result name= "Success" >/success.jsp</result>
</action>
</package>

Let's check the input.

First, the action class inherits the Actionsupport class override Validate () method

@Override
public void Validate () {
if (Username.trim (). Equals ("") | | Username.trim () ==null) {
This.addfielderror ("username", "user name cannot be empty");
}
if (Userpass.trim (). Equals ("") | | Userpass.trim () ==null) {
This.addfielderror ("Userpass", "Password cannot be empty");
}
}

Then we add input.jsp to the Struts,xml.

Struts checks the input data

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