Challenges are what make life interesting

Wednesday, 8 July 2015

Spring rest json responce

1) Create bean of JSON view resolver

<bean name="jsonTemplate" class="org.springframework.web.servlet.view.json.MappingJackson2JsonView"/>

2) Return this Json view from modelAndView controller

@RequestMapping(value = "/clients")
public String getAllClientsJSON(Model model) {

model.addAttribute("clients", getClientsCollection());
return "jsonTemplate";

}

//getClientsCollection() this meothod will have list of clients

Tuesday, 30 June 2015

how to call a constructor from another constructor in java

how to call a constructor from another constructor in java
Use this keyword to achieve this

public class FooConstructor
{
private int x;

public FooConstructor ()
{
this(1);
}

public FooConstructor (int x)
{
this.x = x;
}
}

Monday, 11 May 2015

Saturday, 9 May 2015

Hibernate n+1 solution

Hibernate n+1 solution.
Hiberntae has n+1 problame to solve this we can use the
1) Join
2)Criteria query
========================================
Let say i have one "client " and many "product" relationship here is one to many we use but when we
try to fetch the client records it also fetch product records by default lazily.

<<<<We need to use this query for to resoled this pro blame>>>
-------------------------------------------------------------
"from Client client join fetch client.product Product"
-------------------------------------------------------------
<<<<<Hibernate will Gen rate SQL query like this.>>>>>
-------------------------------------------------------------
Select * From Client client Left Outer Join Product product ON product.product_id =client.product_id
-------------------------------------------------------------

Other way is to use Criteria Query
Criteria cr =session.createCriteria(Client.class);
cr.setFetchMode("product",FetchMode.EAGER);

Thursday, 7 May 2015

email jquery validation

radio button validation in jquery

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@ taglib uri="http://www.springframework.org/tags" prefix="spring"%>

<html>
<head>

<script>
$(document).ready(function(){
$('#companySelect').change(function () {
var selectedValue = $(this).prop('value');
if (selectedValue == '--Please Select') {
$('#officeName').empty();
} else {
$.post('${pageContext.request.contextPath}/docmanager/admin/officeListjson', selectedValue, function(data) {
$('#officeName').empty();
$.each(data, function(index,value) {
//alert("index"+index +"-value="+value.officeId);
$('#officeName').append($("<option></option>").val(value.officeId).html(value.officeName));
});
}, 'json');
}
});

$("form[id='createUserForm']").submit(function() {
$(this).ajaxSubmit({
dataType: "json",
//success: dialogSaveStatusCheck,
success: function(data) {
if(data.success == 'true') alert('Saved Successfully..');
else alert('Failed adding person: ' + data.success + ', ' + data.errorMessage);
},
error: formSaveError
});
return false;
});

$('#btnSubmit').click(function(e) {
var isValid = true;
if ( $('#fName').val() == '' )
{
isValid = false;
$('#fName').css({
"border": "1px solid red",
"background": "#FFCECE"
});
}
var fName = $('#fName').val();
if(validateFNameSize(fName)){
//$('#fNameErr').hide();
}
else {

$("#fNameErr").text("Invalid First Name")
$('#fNameErr').css({
"border": "1px solid red",
"background": "#FFCECE"
});

e.preventDefault();
$('#fName').focus();
}

if ( $('#lName').val() == '' )
{ isValid = false;
$('#lName').css({
"border": "1px solid red",
"background": "#FFCECE"
});
}
var lName = $('#lName').val()
if(validateLNameSize(fName)){
//$('#fNameErr').hide();
}
else {

$("#lNameErr").text("Invalid Last Name")
$('#lNameErr').css({
"border": "1px solid red",
"background": "#FFCECE"
});

e.preventDefault();
$('#LName').focus();
}

if ( $('#email').val() == '' )
{
isValid = false;
$('#email').css({
"border": "1px solid red",
"background": "#FFCECE"
});
}

if ( $('#login').val() == '' )
{
isValid = false;
$('#login').css({
"border": "1px solid red",
"background": "#FFCECE"
});
}
var login = $('#login').val()
if(validatelogin(login)){
//$('#fNameErr').hide();
}
else {

$("#login").text("Invalid login Name")
$('#login').css({
"border": "1px solid red",
"background": "#FFCECE"
});

e.preventDefault();
$('#LName').focus();
}

if ( $('#officeName').val() == '' )
{
isValid = false;
$('#officeName').css({
"border": "1px solid red",
"background": "#FFCECE"
});
}
var officeName = $('#officeName').val()
if(validateLNameSize(officeName)){
//$('#fNameErr').hide();
}
else {

$("#lNameErr").text("Invalid office Name")
$('#lNameErr').css({
"border": "1px solid red",
"background": "#FFCECE"
});

e.preventDefault();
$('#LName').focus();
}

if ( $('#password').val() == '' )
{
isValid = false;
$('#password').css({
"border": "1px solid red",
"background": "#FFCECE"
});
}
var passwordName = $('#password').val()
if(validatePassword(passwordName)){
//$('#fNameErr').hide();
}
else {

$("#pwdErr").text("Invalid Password")
$('#pwdErr').css({
"border": "1px solid red",
"background": "#FFCECE"
});

e.preventDefault();

}

var sEmail = $('#email').val();
if ($.trim(sEmail).length == 0) {
// alert('Please enter valid email address');
e.preventDefault();
}
if (validateEmail(sEmail)) {
//alert('Email is valid');
$('#emailErr').hide();
}
else {

$("#emailErr").text("Invalid Email Address")
$('#emailErr').css({
"border": "1px solid red",
"background": "#FFCECE"
});
//alert('Invalid Email Address');
e.preventDefault();
$('#email').focus();
}

if (isValid == false)
e.preventDefault();

$('#createUserForm input').blur(function() {

alert('Thanks');
if ($.trim($(this).val()) == '') {
isValid = false;
$(this).css({
"border": "1px solid red",
"background": "#FFCECE"
});
}
else {
$(this).css({
"border": "",
"background": ""
});
}
});
if (isValid == false)
e.preventDefault();
else
alert('Thank you for submitting');
});

});

function validateEmail(sEmail) {
var filter = /^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/;
if (filter.test(sEmail)) {
return true;
}
else {
return false;
}
}
function validateFNameSize(fName) {
if (fName.length <= 6) {
$("#fNameErr").text("First Name must be at least 5 characters long")
$('#fNameErr').css({
"border": "1px solid red",
"background": "#FFCECE"
});
return true;

}
else {
return false;
}
}
function validateLNameSize(lName) {
if (lName.length <= 6) {
$("#lNameErr").text("Last Name must be at least 5 characters long")
$('#lNameErr').css({
"border": "1px solid red",
"background": "#FFCECE"
});
return true;

}
else {
return false;
}
}

function validatePassword(passwordName) {
if (passwordName.length <= 3) {
$("#pwdErr").text("Password must be at least 3 characters long")
$('#pwdErr').css({
"border": "1px solid red",
"background": "#FFCECE"
});
return true;

}
else {
return false;
}
}

function validatelogin(login) {
if (login.length <= 6) {
$("#loginErr").text("login must be at least 6 characters long")
$('#loginErr').css({
"border": "1px solid red",
"background": "#FFCECE"
});
return true;

}
else {
return false;
}
}

</script>

</head>
<body>
<form:form id="createUserForm" method="POST" commandName="user" action="${pageContext.request.contextPath}/docmanager/admin/save">
<div class="mainDiv">
<div class="inner1Div">USER DETAILS</div>

<table border="1" class="tableNav">
<tr>
<td>FirstName * : <form:input id="fName" path="firstName" />

<div id="fNameErr"></div></td>
<td>LastName *: <form:input id="lName" path="lastName" /><div id="lNameErr"></div></td>
<td>Email *: <form:input id="email" path="email" /><div id="emailErr"></div></td>

</tr>
<tr>
<td>Login *       : <form:input id="login" path="login" /><div id="loginErr"></div></td>
<td>Password * : <form:password id="password"path="password" /><div id="pwdErr"></div></td>
</tr>
</table>

</div>

<div class="_blankDiv"></div>

<div class="mainDiv">
<div class="inner1Div">USER ACCESS</div>
<table border="1" class="tableNav">
<tr>
<td><form:label path="companyName"></form:label></td>
<td>CompanyId* <form:select path="companyId"
id="companySelect" cssClass="select">
<form:option value="-" label="--Please Select" />
<form:options path="companyId" items="${compList}"
itemValue="companyId" itemLabel="companyName" />
</form:select></td>

<td><form:label path="officeId"></form:label></td>
<td>OfficeId*<form:select id="officeName" path="officeId"
cssClass="select"></form:select></td>
</tr>

</table>

</div>

<div class="_blankDiv"></div>

<div class="mainDiv">
<div class="inner1Div">USER ROLE</div>
<table class="tableNav">
<tr>
<td><form:radiobutton path="role" value="3"/>USER_ROLE</td>
<td><form:radiobutton path="role" value="2"/>ADMIN_ROLE</td>
<td><form:radiobutton path="role" value="1" disabled="true"/>SUPER_USER</td>
</tr>
</table>
</div>
<div class="_blankDiv"></div>
<div>
<table>
<tr>
<td width="30%">
<button type="submit" value="Submit" class="button" id="btnSubmit">Submit</button>
</td>
<td width="30">
<button type="reset" value="Reset" class="button">Reset</button>
</td>
</tr>
</table>
</div>
</form:form>
</body>
</html>

Tuesday, 21 April 2015

Loop Optimization in java

Loop Optimization I found it very interesting thing that will increase the java looping performance
===============================================================

public loopA()

{

String str = “abcdefghijklmnopqurstuvwxyz”;

for (int j = 0; j < str.length(); j++) {

}

====================================================

public loopB()

{

String str = “abcdefghijklmnopqurstuvwxyz”;

int len = str.length();

for (int j = 0; j < len; j++)

{

//This is because the length of the string is not calculated for each iteration

//through the loop.

}

}
====================================================
LooB is 200% faster than loopA.

This is because the length of the string is not calculated for each iteration

through the loop. The method call to str.length() is avoided by setting the results to an integer prior to entering the loop.