Context#pathParam("name") method return the value mapped to this path parameter.
Example
javalin.get("/hello/{name}", (ctx) -> { String name = ctx.pathParam("name"); ctx.result("Hello " + name + ", how are you?").status(HttpStatus.OK); });
Find the below working application.
Step 1: Create new maven project ‘javalin-path-parameter-by-name’.
Step 2: Update pom.xml with maven dependencies.
pom.xml
<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> <groupId>com.sample.app</groupId> <artifactId>javalin-path-parameter-by-name</artifactId> <version>1.0.0</version> <properties> <packaging>jar</packaging> <jdk.version>17</jdk.version> <release.version>17</release.version> </properties> <dependencies> <dependency> <groupId>io.javalin</groupId> <artifactId>javalin</artifactId> <version>5.3.2</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-simple</artifactId> <version>2.0.3</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.14.0</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.14.0</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.10.1</version> <configuration> <source>17</source> <target>17</target> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-assembly-plugin</artifactId> <version>2.6</version> <configuration> <descriptorRefs> <descriptorRef>jar-with-dependencies</descriptorRef> </descriptorRefs> <archive> <manifest> <addClasspath>true</addClasspath> <mainClass>com.sample.app.App</mainClass> </manifest> </archive> </configuration> <executions> <execution> <id>assemble-all</id> <phase>package</phase> <goals> <goal>single</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </project>
Step 3: Define main application class.
App.java
package com.sample.app; import io.javalin.Javalin; import io.javalin.http.HttpStatus; public class App { public static void main(String[] args) { Javalin javalin = Javalin.create(); javalin.get("/", (ctx) -> { ctx.result("Welcome to Javalin programming!!!!"); }); javalin.get("/hello/{name}", (ctx) -> { String name = ctx.pathParam("name"); ctx.result("Hello " + name + ", how are you?").status(HttpStatus.OK); }); javalin.start(8080); } }
Total project structure looks like below.
Build the project
Navigate to the folder, where pom.xml is located and execute the command ‘mvn package’.
Upon successful command execution, you can see a ‘javalin-path-parameter-by-name-1.0.0-jar-with-dependencies.jar’ file.
$ls ./target/ archive-tmp classes generated-sources generated-test-sources javalin-path-parameter-by-name-1.0.0-jar-with-dependencies.jar javalin-path-parameter-by-name-1.0.0.jar maven-archiver maven-status test-classes
Run the application
Execute below command to run the application.java -jar ./target/javalin-path-parameter-by-name-1.0.0-jar-with-dependencies.jar
$java -jar ./target/javalin-path-parameter-by-name-1.0.0-jar-with-dependencies.jar [main] INFO io.javalin.Javalin - Starting Javalin ... [main] INFO org.eclipse.jetty.server.Server - jetty-11.0.13; built: 2022-12-07T20:47:15.149Z; git: a04bd1ccf844cf9bebc12129335d7493111cbff6; jvm 17.0.5+9-LTS-191 [main] INFO org.eclipse.jetty.server.session.DefaultSessionIdManager - Session workerName=node0 [main] INFO org.eclipse.jetty.server.handler.ContextHandler - Started i.j.j.@3911c2a7{/,null,AVAILABLE} [main] INFO org.eclipse.jetty.server.AbstractConnector - Started ServerConnector@5bcea91b{HTTP/1.1, (http/1.1)}{0.0.0.0:8080} [main] INFO org.eclipse.jetty.server.Server - Started Server@42607a4f{STARTING}[11.0.13,sto=0] @484ms [main] INFO io.javalin.Javalin - __ ___ ______ / /___ __ ______ _/ (_)___ / ____/ __ / / __ `/ | / / __ `/ / / __ \ /___ \ / /_/ / /_/ /| |/ / /_/ / / / / / / ____/ / \____/\__,_/ |___/\__,_/_/_/_/ /_/ /_____/ https://javalin.io/documentation [main] INFO io.javalin.Javalin - Listening on http://localhost:8080/ [main] INFO io.javalin.Javalin - You are running Javalin 5.3.2 (released January 22, 2023). [main] INFO io.javalin.Javalin - Javalin started in 311ms \o/
Test the api
Execute below command to run the application.
curl --location --request GET 'http://localhost:8080/hello/krishna'
$curl --location --request GET 'http://localhost:8080/hello/krishna' Hello krishna, how are you?
You can download this application from this link.
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