Skip to main content

Converters in JSF 2

 Converters in JSF2 are used to easily convert a value from one data type to other. The following inbuilt converters are available in JSF2.

Converter Name Converter Class
Byte Converter javax.faces.convert.ByteConverter
Short Converter javax.faces.convert.ShortConverter
Character Converter javax.faces.convert.CharacterConverter
Boolean Converter javax.faces.convert.BooleanConverter
Integer Converter javax.faces.convert.IntegerConverter
Float Converter javax.faces.convert.FloatConverter
Double Converter javax.faces.convert.DoubleConverter
Long Converter javax.faces.convert.LongConverter
Big Integer Converter javax.faces.convert.BigIntegerConverter
Big Decimal Converter javax.faces.convert.BigDecimalConverter
Date Time Converter javax.faces.convert.DateTimeConverter
Number Converter javax.faces.convert.NumberConverter
Enum Converter javax.faces.convert.EnumConverter

 The JSF2 also allow developers to create a custom converter for their own purpose. The following rules are very important because almost all the developers are makes lot of mistake here.
 1. Before going to use any converter, we need to register that converter into faces-config.xml file (If you are going to create custom converter, this is important). Se the below example, Here I have registered Integer converter into facex-config.xml file.

  Integer
  javax.faces.convert.IntegerConverter

 2. By default all converter have error message. If converter can't able to convert the value, then it will display error message. So we need to register error message component for corresponding converter component.
 3. We need to bind a value of the component to managed bean property as the same type as the converter.
 4. We have two ways for registering converter component. The first one is using converter attribute directly on the component tag and another one is, we can nest a converter tag within the component tag and use converter tag's converterId attribute or binding attribute to reference the converter. Examples are here.


 
 In my upcoming post, I am going to give a small example for above converters.

Comments

Popular posts from this blog

Getting key/value pair from JSON object and getting variable name and value from JavaScript object.

Hi, I had faced one issue like this. I have an JSON object but I don't know any key name but I need to get the all the key and corresponding value from JSON object using client side JavaScript. Suddenly I wondered whether it's possible or not, after that I had done lot of workaround and finally got this solution. See the below example.
function getKeyValueFromJSON() {
var jsonObj = {a:10,b:20,c:30,d:50}; for(var key in jsonObj) {       alert("Key: " + key + " value: " + jsonObj[key]);     }  }
 In this example I have created the one json array as string, and converted this string into JSON object using eval() function. Using for-each loop I got all the key value from jsonObj, and finally using that key I got the corresponding value.
 Finally I got the alert like this,

 Key: a value:10
   Key: b value:20
   Key: c value:30
   Key: d value:50

 During this workaround I got one more idea, using this same way I got all the variable name and corresponding value from Java…

Simple Login Application Using Spring MVC and Hibernate – Part 1

I hope developers working in web application development might hear about MVC architecture. Almost all technologies provide support for MVC based web application development, but the success is based on many factors like reusable of the code, maintenance of the code, future adaption of the code, etc..,  The success of the Spring MVC is “Open for extension and closed for modification” principle. Using Spring MVC the developers can easily develop MVC based web application. We don’t need any steep learning curve at the same time we need to know the basics of spring framework and MVC architecture. The Spring MVC consists of following important components. 1. Dispatcher servlet
2. Controller
3. View Resolver
4. Model Spring MVC - Overview  The overall architecture of Spring MVC is shown here.  1. When “Dispatcher Servlet” gets any request from client, it finds the corresponding mapped controller for the request and just dispatches the request to the corresponding controller. The reque…

Simple Login Application Using Spring MVC and Hibernate – Part 2

I hope you have visited my part1 of my tutorial. Let’s see the steps for integrating hibernate framework into Spring MVC. Here I have used MySQL database. I have created one database called “springmvc” and created one table called “user” with userid, username, password fields.
 I have inserted some records into table like this. Step 1: Creating User POJO class.  We need to create a User POJO class for mapping user table. Ok let’s create it. Step 2: Creating hibernate mapping xml file for user class.  In hibernate we need to create hibernate mapping xml file for all domain class for mapping into corresponding database table. Instead of creating xml file you can use annotation for mapping domain class into database table. This is my mapping xml document created for mapping our user domain class into user database table. Step 3: Creating authenticate service class.
 The method “verifyUserNameAndPassword” present in “AuthenticateService” class is used for  verifying the user name and pa…