Spring Boot JSP Example
This example shows how to render a jsp in Spring Boot application
Step 1) Create pom.xml and add below maven dependency
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>
Step 2) Create WebApplication class
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
@SpringBootApplication
public class WebApplication extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(WebApplication.class);
}
public static void main( String[] args ) {
SpringApplication.run(WebApplication.class, args);
}
} Step 3) Create HelloWorldController class which will expose endpoint to return a String which will be displayed by the JSP page
package com.example.demo;
import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
@Controller
public class HelloWorldController {
@GetMapping("/")
public String hello(Map<String, Object> model) {
model.put("message", "Hello world JSP example");
return "helloWorld";
}
} Step 4) Create helloWorld.jsp file under src/main/webapp/WEB-INF/jsp folder
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<title>Spring Boot JSP example</title>
<link href="css/main.css" rel="stylesheet">
</head>
<body>
<h1>Spring Boot JSP Example</h1>
<h2>Message: ${message}</h2>
</body>
</html>
Step 5) Create application.properties file under src/main/resources folder
spring.mvc.view.prefix: /WEB-INF/jsp/ spring.mvc.view.suffix: .jsp
Step 6) Create main.css file under src/main/resources/static/css folder
spring.mvc.view.prefix: /WEB-INF/jsp/ spring.mvc.view.suffix: .jsp
Step 7) Running WebApplication
Console Output :
2019-10-19 09:23:33.576 INFO 4432 --- [main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2019-10-19 09:23:33.620 INFO 4432 --- [main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-10-19 09:23:33.620 INFO 4432 --- [main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.21]
2019-10-19 09:23:33.931 INFO 4432 --- [main] org.apache.jasper.servlet.TldScanner : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
2019-10-19 09:23:33.938 INFO 4432 --- [main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-10-19 09:23:34.591 INFO 4432 --- [main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2019-10-19 09:23:34.595 INFO 4432 --- [main] com.example.demo.WebApplication : Started WebApplication in 3.447 seconds (JVM running for 3.933)
2019-10-19 09:23:39.334 INFO 4432 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2019-10-19 09:23:39.334 INFO 4432 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2019-10-19 09:23:39.343 INFO 4432 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 9 ms
Step 8) Testing HelloWorldApplication
Open any browser and launch http://localhost:8080. You will see 'Hello World' message displayed in the broswer.
