You may run into an error indicating how to get the servletconfig object in the servlet. There are several ways to solve this problem. We’ll talk about this a little later.
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For each servlet, a ServletConfig object is created by the web container. This object can be used to get configuration information from the web.xml file. If the configuration information in the web.xml file has changed, the servlet does not need to be changed. This makes it easier to manage the web application if some content changes from time to time. ServletConfig AdvantageThe main advantage of ServletConfig is that you don’t need to change the servlet file if the information in the web.xml file changes. ServletConfig Interface Methods
How To Get An Object From ServletConfig
Syntax of the getServletConfig () method Example GetServletConfig () Method
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- ServletConfig Interface
- ServletConfig Interface Methods
- How to get an object from ServletConfig
- Syntax for providing a servlet initialization parameter
- Example for ServletConfig getting initialization parameter
- Example for ServletConfig to get all initialization parameters.
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1.1 What Is ServletConfig?
ServletConfig is an interface in the Servlet API that is used to initialize a single servlet in a web application through a servlet container. In descriptor p web.xml deployments developers define a servlet initialization parameter for this servlet. Information is declared in the tag in a name-value pair. The ServletConfig interface signature is as follows:
public interface ServletConfig
Developers can use ServletConfig and to configure any servlet in the J2EE environment.
1.1.1 Some points to know about the ServletConfig interface
- For each servlet run, the servlet container creates a
ServletConfigobject that is used by the programmer to read the servlet-specific data declared inweb.xml
ServletConfig is the interface of the javax.servlet package.
getServletConfig () method of the GenericServlet class returns an object of the ServletConfig class. ServletConfig object created by the container for a particular servlet cannot read data from another servlet ServletConfig object refers to a Servlet. Another possibility is that if 100 servlet objects are executing in a container, implicitlyo 100 ServletConfig objects are created to communicate with the servlet. ServletConfig object is also destroyed ServletConfig object to read the tags of the servlets. tag are called initialization parameters.1.1.2 Sample Code
Let’s take a look at a simple code snippet that follows the ServletConfig implementation.
ServletConfigTest com.jcg.servlet.ServletConfigTest topicName Difference between ServletConfig and ServletContext
In the servlet, we get the value of this parameter using the getInitParameter ("param-name") method, i.e. H.
Line name = getServletConfig (). getInitParameter ("theme name");
ServletConfig Interface Methods
public String getInitParameter (String name): Returns the value of the specified parameter as a string, or null if the specified parameter does not exist in web.xml.
public enumeration getInitParameterNames (): Returns an enumeration of all parameter names.
public String getServletName (): returns the name of the servlet instanceentry.
public ServletContext getServletContext (): returns an object from ServletContext.
Initializing Servlets – OVGU
You can get it in the servlet’s initialization method if the servlet needs to load additional classes from the application. This is a handy rewriting method for initializing servlets. In this case, you need to get the ServletConfig object in the body of the method and use it to get the initialization parameters.
How to get ServletContext and ServletConfig object in a …
Implement the Spring * Aware interfaces for these ServletContextAware and ServletConfigAware interfaces. …Using @Autowired annotation with servletContext and ServletConfig bean variables.
Reading Initialization Parameters – Documentation | Perforce
Implementing the Spring * Aware interfaces for these ServletContextAware and ServletConfigAware interfaces. …Using @Autowired annotation with servletContext and ServletConfig bean variables.
