JOBS4TIMES

Describing Spring View-Resolver and View

1. Types of View Resolver
   1. UrlBasedViewResolver
   2. InternalResourceViewResolver
   3. ResourceBundleViewResolver
   4. BeanNameViewResolver
   5. XmlViewResolver

View Resolver

1. UrlBasedViewResolver
2. InternalResourceViewResolver
3. ResourceBundleViewResolver
4. BeanNameViewResolver
5. XmlViewResolver

UrlBasedViewResolver

<bean id="viewResolver" 
   class="org.springframework.web.servlet.view.UrlBasedViewResolver">
 <property name="prefix" value="/WEB-INF/jsps"/>
 <property name="suffix" value=".jsp"/>
 <property name="viewClass" 
   value="org.springframework.web.servlet.view.InternalResourceView"/>
</bean>

InternalResourceViewResolver

<bean id="viewResolver" 
 class="org.springframework.web.servlet.view.InternalResourceViewResolver">
 <property name="prefix" value="/WEB-INF/jsps"/>
 <property name="suffix" value=".jsp"/>
 <property name="viewClass" 
  value="org.springframework.web.servlet.view.InternalResourceView"/>
</bean>

ResourceBundleViewResolver

<bean id="viewResolver" 
 class="org.springframework.web.servlet.view.ResourceBundleViewResolver">
 <property name="basename" value="myViews"/>
</bean>

BeanNameViewResolver

<bean id="viewResolver" 
 class="org.springframework.web.servlet.view.BeanNameViewResolver"/>

XmlViewResolver

<bean id="viewResolver" 
 class="org.springframework.web.servlet.view.XmlViewResolver">
 <property name="location" value="/WEB-INF/views/MYViews.xml"/>
</bean>

Configuring Multiple ViewResolvers :

<bean class="org.springframework.web.servlet.view.XmlViewResolver">
  <property name="location" value="/WEB-INF/views/MYViews.xml"/>
  <property name="order" value="0"/>
</bean>

<bean class="org.springframework.web.servlet.view.BeanNameViewResolver">
 <property name="order" value="1"/>
</bean>

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  <property name="prefix" value="/"/>
  <property name="suffix" value=".jsp"/>
  <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
  <property name="order" value="2"/>
</bean>

Understanding View :

 package com.view;

import java.util.Map;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.View;

public class MyGifView implements View {

public String getContentType() {
 return "image/gif";
}

public void render(Map model,
		   HttpServletRequest request,
		   HttpServletResponse response) throws Exception {
 byte[]	content=(byte[]) model.get("ResponseContent");
 ServletOutputStream sos=response.getOutputStream();
 sos.write(content);
 sos.flush();
 sos.close();
}//render()

}

Working with JSTL View :

• JSP Standard Tag Library(JSTL) is a collection of custom tag libraries, which provide core functionality used for JSP document.
• JSTL reduces the use of scriptlets in a JSP page.
• The use of JSTL tags allows developers to use predefined tags instead of writing the Java code.

1. Core Tags : used to process core operations in a JSP page.
2. XML Tags : used for parsing, selecting, and transforming XML data in a JSP page.
3. Format Tags : used for formatting the data used in a JSP page according to locale.
4. SQL Tags : used to access the relational database used in a JSP page.

Example for JSTLView

Generating Views using Velocity :