PNamespace inside spring

Summary

• Namespace is a collection of library which is a collection of tags/properties.
• Just like we have package in Java which is a collection of classes/interfaces, similarly, we have the concept of namespace in XML.
• In XML, a namespace is a library, which is a collection of tags/properties.
• To use those tags/properties, we have to include the respective namespace in our XML configuration file.
• Some examples are as follows:
  • [Beans package] (http://www.springframework.org/schema/beans)
  • [Utils package] (http://www.springframework.org/schema/util)
  • [Property package] (http://www.springframework.org/schema/p)
  • [Constructor package] (http://www.springframework.org/schema/c)

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Introduction to P:Namespace

• P:Namespace
  • While using setter injection, we use <property> tag, one per setter method.
  • This means that if our bean has 10 properties/setters, we will have to use 10 <property> tags.
  • This makes our code lengthy and unmanageable.
  • To overcome this Spring has introduced the concept of p:namespace.
  • In Spring XML, p-namespace is the XML shortcut for <property> tag to inject bean dependency.
  • The p-namespace replaces <property> tag in XML configuration.
  • It is easier and clear to use and increases the readability of XML configuration.
  • To use p-namespace, we first have to add the following xmlns:p at the top in our XML schema:
    • xmlns:p="http://www.springframework.org/schema/p"
  • Example:
    • Once we do this, we can now remove the <property> tag and pass the values in the <bean> tag itself using the following syntax:
    • <bean class="…" id="…" p:prop_Name="…" p:prop_Name="..">
    • On adding the code in XML configuration, the term prop_Name will replace actual name of property as shown below:
      • p:roll="100"