Step-By-Step Implementation
Step 1: Go to spring Initializr and create a configuration file with the following dependency :
- Spring Web
Configuration File
Step 2: Extract the zip file, and go to your favorite IDE, we’ll use Intellij in this article
Step 3: Now create two packages – Filter and REST, and further two classes in them – MyFilter and ServletController (appropriately). Your final directory structure should look something like this:-
Directory Structure
Settings file for our Spring Boot Project i.e. pom.xml
XML
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>3.1.5</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.w3wiki</groupId> <artifactId>ServletFilterExample</artifactId> <version>0.0.1-SNAPSHOT</version> <name>ServletFilterExample</name> <description>Demo project for Spring Boot</description> <properties> <java.version>17</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project> |
Step 4: Implementing the Filter. Write the following business logic in the class – MyFilter.
Spring Boot – Servlet Filter
Spring boot Servlet Filter is a component used to intercept & manipulate HTTP requests and responses. Servlet filters help in performing pre-processing & post-processing tasks such as:
- Logging and Auditing: Logging operations can be performed by the servlet filter logging the request and response which assists in debugging and troubleshooting.
- Authentication and Authorization: Authentication and Authorization refer to the process of providing access and checking if a user has certain privilege permissions to access a resource
- Caching: Caching is a mechanism that allows us to store data temporarily for faster access in the future. It can be done by caching response in servlet filters.
- Routing: Servlet filters can also be used for routing responses to different controllers giving us more control over handling requests
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