![\"Spring](\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/655cd0f6c40ba52feef288e7\/6-0.png\" "\\"\\"")
<\/div>\n<dependency>\r\n\t<groupId>org.springframework<\/groupId>\r\n\t<artifactId>spring-webmvc<\/artifactId>\r\n\t<version>5.0.7.RELEASE<\/version>\r\n<\/dependency>\r\n<dependency>\r\n\t<groupId>org.springframework<\/groupId>\r\n\t<artifactId>spring-web<\/artifactId>\r\n\t<version>5.0.7.RELEASE<\/version>\r\n<\/dependency>\r\n\r\n<!-- Jackson for REST -->\r\n<dependency>\r\n\t<groupId>com.fasterxml.jackson.core<\/groupId>\r\n\t<artifactId>jackson-databind<\/artifactId>\r\n\t<version>2.9.6<\/version>\r\n<\/dependency>\r\n<\/code><\/pre>\nIn this case, we will examine the deployment descriptor (web.xml) to set up the DispatcherServlet servlet as the primary controller.<\/p>\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<web-app xmlns:xsi=\"https:\/\/www.w3.org\/2001\/XMLSchema-instance\" xmlns=\"https:\/\/xmlns.jcp.org\/xml\/ns\/javaee\" \r\n xsi:schemaLocation=\"https:\/\/xmlns.jcp.org\/xml\/ns\/javaee https:\/\/xmlns.jcp.org\/xml\/ns\/javaee\/web-app_3_1.xsd\" id=\"WebApp_ID\" version=\"3.1\">\r\n <display-name>Spring-Controller<\/display-name>\r\n <!-- Add Spring MVC DispatcherServlet as front controller -->\r\n\t<servlet>\r\n <servlet-name>spring<\/servlet-name>\r\n <servlet-class>\r\n org.springframework.web.servlet.DispatcherServlet\r\n <\/servlet-class>\r\n <init-param>\r\n \t\t<param-name>contextConfigLocation<\/param-name>\r\n \t\t<param-value>\/WEB-INF\/spring-servlet.xml<\/param-value>\r\n \t\t<\/init-param>\r\n <load-on-startup>1<\/load-on-startup>\r\n <\/servlet>\r\n \r\n <servlet-mapping>\r\n <servlet-name>spring<\/servlet-name>\r\n <url-pattern>\/<\/url-pattern> \r\n <\/servlet-mapping>\r\n<\/web-app>\r\n<\/code><\/pre>\nLastly, we possess the subsequent spring context file. In this file, we set up our application for annotation-based configuration and specify the root package to scan for spring components. Additionally, we configure the InternalResourceViewResolver bean and provide specifics about the view pages.<\/p>\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<beans:beans xmlns=\"https:\/\/www.springframework.org\/schema\/mvc\"\r\n\txmlns:xsi=\"https:\/\/www.w3.org\/2001\/XMLSchema-instance\" xmlns:beans=\"https:\/\/www.springframework.org\/schema\/beans\"\r\n\txmlns:context=\"https:\/\/www.springframework.org\/schema\/context\"\r\n\txsi:schemaLocation=\"https:\/\/www.springframework.org\/schema\/mvc https:\/\/www.springframework.org\/schema\/mvc\/spring-mvc.xsd\r\n\t\thttps:\/\/www.springframework.org\/schema\/beans https:\/\/www.springframework.org\/schema\/beans\/spring-beans.xsd\r\n\t\thttps:\/\/www.springframework.org\/schema\/context https:\/\/www.springframework.org\/schema\/context\/spring-context.xsd\">\r\n\r\n\t<!-- Enables the Spring MVC @Controller programming model -->\r\n\t<annotation-driven \/>\r\n\r\n\t<context:component-scan base-package=\"com.scdev.spring\" \/>\r\n\r\n\t<!-- Resolves views selected for rendering by @Controllers to JSP resources \r\n\t\tin the \/WEB-INF\/views directory -->\r\n\t<beans:bean\r\n\t\tclass=\"org.springframework.web.servlet.view.InternalResourceViewResolver\">\r\n\t\t<beans:property name=\"prefix\" value=\"\/WEB-INF\/views\/\" \/>\r\n\t\t<beans:property name=\"suffix\" value=\".jsp\" \/>\r\n\t<\/beans:bean>\r\n\r\n<\/beans:beans>\r\n<\/code><\/pre>\nOur Controller class will be our next focus as our configuration XML files have been prepared.<\/p>\n
package com.scdev.spring.controller;\r\n\r\nimport java.text.DateFormat;\r\nimport java.util.Date;\r\nimport java.util.Locale;\r\n\r\nimport org.springframework.stereotype.Controller;\r\nimport org.springframework.ui.Model;\r\nimport org.springframework.web.bind.annotation.GetMapping;\r\n\r\n@Controller\r\npublic class HomeController {\r\n\r\n\t@GetMapping(\"\/hello\")\r\n\tpublic String home(Locale locale, Model model) {\r\n\t\tDate date = new Date();\r\n\t\tDateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG, locale);\r\n\t\tString formattedDate = dateFormat.format(date);\r\n\t\tmodel.addAttribute(\"serverTime\", formattedDate);\r\n\t\treturn \"home\";\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\nWe have created a request handler method specifically for receiving GET requests with the URI “\/hello” and responding with the “home.jsp” page. It is important to note that we have also assigned a value to a model attribute, which will be utilized on the home.jsp page. Below is the code for our straightforward home.jsp page.<\/p>\n
<%@ page language=\"java\" contentType=\"text\/html; charset=UTF-8\"\r\n\tpageEncoding=\"UTF-8\"%>\r\n<html>\r\n<head>\r\n<title>Home<\/title>\r\n<\/head>\r\n<body>\r\n\t<h1>Hello world!<\/h1>\r\n\r\n\t<p>The time on the server is ${serverTime}.<\/p>\r\n\r\n<\/body>\r\n<\/html>\r\n<\/code><\/pre>\nTesting of Spring MVC<\/a> Controllers<\/h2>\n![\"Spring](\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/655cd0f6c40ba52feef288e7\/17-0.png\" "\\"\\"")
<\/div>\nExample of a Spring RestController.<\/h2>\n
Let’s now enhance our application to also provide REST APIs. Develop a model class that will be transmitted as a JSON response.<\/p>\n
package com.scdev.spring.model;\r\n\r\npublic class Person {\r\n\r\n\tprivate String name;\r\n\r\n\tpublic String getName() {\r\n\t\treturn name;\r\n\t}\r\n\r\n\tpublic void setName(String name) {\r\n\t\tthis.name = name;\r\n\t}\r\n\t\r\n}\r\n<\/code><\/pre>\nThis is our elementary REST Controller class.<\/p>\n
package com.scdev.spring.controller;\r\n\r\nimport org.springframework.web.bind.annotation.RequestMapping;\r\nimport org.springframework.web.bind.annotation.RequestParam;\r\nimport org.springframework.web.bind.annotation.RestController;\r\n\r\nimport com.scdev.spring.model.Person;\r\n\r\n@RestController\r\npublic class PersonRESTController {\r\n\r\n\t@RequestMapping(\"\/rest\")\r\n\tpublic String healthCheck() {\r\n\t\treturn \"OK\";\r\n\t}\r\n\r\n\t@RequestMapping(\"\/rest\/person\/get\")\r\n\tpublic Person getPerson(@RequestParam(name = \"name\", required = false, defaultValue = \"Unknown\") String name) {\r\n\t\tPerson person = new Person();\r\n\t\tperson.setName(name);\r\n\t\treturn person;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\nPlease test our REST APIs by redeploying the application once more.<\/p>\n
Testing the REST Controller of Spring.<\/h2>\n![\"Spring](\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/655cd0f6c40ba52feef288e7\/25-2.png\" "\\"\\"")
<\/div>\nGive me a single option to paraphrase the following natively: “Provide a brief overview.”<\/h2>\n
The Spring Controller serves as the foundation for Spring MVC applications, initiating our business logic. Additionally, the RestController simplifies the creation of REST-based web services.<\/p>\n
The example project code is available for download on our GitHub Repository.<\/p>\n
<\/p>\n
more tutorials<\/p>\n
Spring Component annotation(Opens in a new browser tab)<\/span><\/a><\/p>\nSpring MVC HandlerInterceptorAdapter and HandlerInterceptor.(Opens in a new browser tab)<\/span><\/a><\/p>\nOne example of Spring REST XML and JSON(Opens in a new browser tab)<\/span><\/a><\/p>\nSpring Boot CLI(Opens in a new browser tab)<\/span><\/a><\/p>\n