Spring Web Contexts (BAEL-82) (#2113)
* spring web contexts example * applicationContext util added * java based configuration added * bean name fixed
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package com.baeldung.contexts;
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public class Greeting {
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private String message;
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public String getMessage() {
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return message;
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}
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public void setMessage(String message) {
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this.message = message;
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}
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@Override
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public String toString() {
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return "Greeting [message=" + message + "]";
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}
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}
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package com.baeldung.contexts.config;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRegistration;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.web.WebApplicationInitializer;
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import org.springframework.web.context.ContextLoaderListener;
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import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
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import org.springframework.web.servlet.DispatcherServlet;
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@Configuration
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public class ApplicationInitializer implements WebApplicationInitializer {
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@Override
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public void onStartup(ServletContext servletContext) throws ServletException {
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AnnotationConfigWebApplicationContext rootContext = new AnnotationConfigWebApplicationContext();
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rootContext.register(RootApplicationConfig.class);
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servletContext.addListener(new ContextLoaderListener(rootContext));
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AnnotationConfigWebApplicationContext normalWebAppContext = new AnnotationConfigWebApplicationContext();
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normalWebAppContext.register(NormalWebAppConfig.class);
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ServletRegistration.Dynamic normal = servletContext.addServlet("normal-webapp", new DispatcherServlet(normalWebAppContext));
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normal.setLoadOnStartup(1);
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normal.addMapping("/api/*");
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AnnotationConfigWebApplicationContext secureWebAppContext = new AnnotationConfigWebApplicationContext();
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secureWebAppContext.register(SecureWebAppConfig.class);
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ServletRegistration.Dynamic secure = servletContext.addServlet("secure-webapp", new DispatcherServlet(secureWebAppContext));
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secure.setLoadOnStartup(1);
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secure.addMapping("/s/api/*");
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}
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}
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package com.baeldung.contexts.config;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.web.servlet.ViewResolver;
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import org.springframework.web.servlet.config.annotation.EnableWebMvc;
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import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
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import org.springframework.web.servlet.view.InternalResourceViewResolver;
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import org.springframework.web.servlet.view.JstlView;
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@Configuration
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@EnableWebMvc
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@ComponentScan(basePackages = { "com.baeldung.contexts.normal" })
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public class NormalWebAppConfig extends WebMvcConfigurerAdapter {
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@Bean
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public ViewResolver viewResolver() {
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InternalResourceViewResolver resolver = new InternalResourceViewResolver();
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resolver.setPrefix("/WEB-INF/view/");
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resolver.setSuffix(".jsp");
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resolver.setViewClass(JstlView.class);
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return resolver;
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}
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}
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package com.baeldung.contexts.config;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.context.annotation.Configuration;
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import com.baeldung.contexts.Greeting;
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@Configuration
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@ComponentScan(basePackages = { "com.baeldung.contexts.services" })
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public class RootApplicationConfig {
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@Bean
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public Greeting greeting() {
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Greeting greeting = new Greeting();
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greeting.setMessage("Hello World !!");
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return greeting;
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}
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}
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package com.baeldung.contexts.config;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.web.servlet.ViewResolver;
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import org.springframework.web.servlet.config.annotation.EnableWebMvc;
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import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
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import org.springframework.web.servlet.view.InternalResourceViewResolver;
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import org.springframework.web.servlet.view.JstlView;
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@Configuration
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@EnableWebMvc
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@ComponentScan(basePackages = { "com.baeldung.contexts.secure" })
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public class SecureWebAppConfig extends WebMvcConfigurerAdapter {
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@Bean
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public ViewResolver viewResolver() {
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InternalResourceViewResolver resolver = new InternalResourceViewResolver();
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resolver.setPrefix("/WEB-INF/secure/view/");
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resolver.setSuffix(".jsp");
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resolver.setViewClass(JstlView.class);
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return resolver;
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}
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}
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package com.baeldung.contexts.normal;
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import java.util.Arrays;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.Qualifier;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.context.ContextLoader;
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import org.springframework.web.context.WebApplicationContext;
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import org.springframework.web.servlet.ModelAndView;
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import com.baeldung.contexts.services.ApplicationContextUtilService;
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import com.baeldung.contexts.services.GreeterService;
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@Controller
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public class HelloWorldController {
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@Autowired
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WebApplicationContext webApplicationContext;
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@Autowired
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private GreeterService greeterService;
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private void processContext() {
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WebApplicationContext rootContext = ContextLoader.getCurrentWebApplicationContext();
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System.out.println("root context : " + rootContext);
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System.out.println("root context Beans: " + Arrays.asList(rootContext.getBeanDefinitionNames()));
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System.out.println("context : " + webApplicationContext);
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System.out.println("context Beans: " + Arrays.asList(webApplicationContext.getBeanDefinitionNames()));
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}
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@RequestMapping(path = "/welcome")
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public ModelAndView helloWorld() {
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processContext();
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String message = "<br><div style='text-align:center;'>" + "<h3> " + greeterService.greet() + "</h3></div>";
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return new ModelAndView("welcome", "message", message);
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}
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}
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package com.baeldung.contexts.secure;
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import java.util.Arrays;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.Qualifier;
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import org.springframework.context.ApplicationContext;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.context.ContextLoader;
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import org.springframework.web.context.WebApplicationContext;
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import org.springframework.web.servlet.ModelAndView;
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import com.baeldung.contexts.services.ApplicationContextUtilService;
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import com.baeldung.contexts.services.GreeterService;
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@Controller
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public class HelloWorldSecureController {
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@Autowired
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WebApplicationContext webApplicationContext;
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@Autowired
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private GreeterService greeterService;
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@Autowired
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@Qualifier("contextAware")
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private ApplicationContextUtilService contextUtilService;
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private void processContext() {
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ApplicationContext context = contextUtilService.getApplicationContext();
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System.out.println("application context : " + context);
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System.out.println("application context Beans: " + Arrays.asList(context.getBeanDefinitionNames()));
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WebApplicationContext rootContext = ContextLoader.getCurrentWebApplicationContext();
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System.out.println("context : " + rootContext);
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System.out.println("context Beans: " + Arrays.asList(rootContext.getBeanDefinitionNames()));
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System.out.println("context : " + webApplicationContext);
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System.out.println("context Beans: " + Arrays.asList(webApplicationContext.getBeanDefinitionNames()));
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}
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@RequestMapping(path = "/welcome")
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public ModelAndView helloWorld() {
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processContext();
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String message = "<br><div style='text-align:center;'>" + "<h3> " + greeterService.greet() + "</h3></div>";
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return new ModelAndView("welcome", "message", message);
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}
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}
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package com.baeldung.contexts.services;
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import org.springframework.beans.BeansException;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.ApplicationContextAware;
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import org.springframework.stereotype.Service;
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@Service(value="contextAware")
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public class ApplicationContextUtilService implements ApplicationContextAware {
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private ApplicationContext applicationContext;
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@Override
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public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
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this.applicationContext = applicationContext;
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}
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public ApplicationContext getApplicationContext() {
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return applicationContext;
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}
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}
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package com.baeldung.contexts.services;
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import javax.annotation.Resource;
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import org.springframework.stereotype.Service;
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import com.baeldung.contexts.Greeting;
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@Service
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public class GreeterService {
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@Resource
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private Greeting greeting;
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public String greet(){
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return greeting.getMessage();
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}
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}
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<html>
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<body>
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<h2>Hello World!</h2>
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</body>
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</html>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="
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http://www.springframework.org/schema/beans
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http://www.springframework.org/schema/beans/spring-beans.xsd
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http://www.springframework.org/schema/mvc
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http://www.springframework.org/schema/mvc/spring-mvc.xsd
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http://www.springframework.org/schema/context
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http://www.springframework.org/schema/context/spring-context.xsd">
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<context:component-scan base-package="com.baeldung.contexts.normal" />
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<bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
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<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
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<property name="prefix" value="/WEB-INF/view/" />
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<property name="suffix" value=".jsp" />
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</bean>
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</beans>
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<?xml version = "1.0" encoding = "UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:context="http://www.springframework.org/schema/context"
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xsi:schemaLocation="http://www.springframework.org/schema/beans
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http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
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http://www.springframework.org/schema/context
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http://www.springframework.org/schema/context/spring-context-3.0.xsd">
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<context:component-scan base-package="com.baeldung.contexts.services" />
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<bean id="greeting" class="ccom.baeldung.contexts.Greeting">
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<property name="message" value="Hello World !!" />
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</bean>
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</beans>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="
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http://www.springframework.org/schema/beans
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http://www.springframework.org/schema/beans/spring-beans.xsd
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http://www.springframework.org/schema/mvc
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http://www.springframework.org/schema/mvc/spring-mvc.xsd
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http://www.springframework.org/schema/context
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http://www.springframework.org/schema/context/spring-context.xsd">
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<context:component-scan base-package="com.baeldung.contexts.secure" />
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<bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
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<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
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<property name="prefix" value="/WEB-INF/secure/view/" />
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<property name="suffix" value=".jsp" />
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</bean>
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</beans>
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<html>
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<head>
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<title>Spring Web Contexts</title>
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</head>
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<body>
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<br>
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<div style="padding: 10px; border-radius: 10px; font-size: 30px; text-align: center;">
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Secure Web Application : ${message}
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</div>
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</body>
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</html>
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<html>
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<head>
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<title>Spring Web Contexts</title>
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</head>
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<body>
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<br>
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<div style="padding: 10px; border-radius: 10px; font-size: 30px; text-align: center;">
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Normal Web Application : ${message}
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</div>
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</body>
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</html>
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xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
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version="3.0">
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<!-- load root application context -->
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<context-param>
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<param-name>contextConfigLocation</param-name>
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<param-value>/WEB-INF/rootApplicationContext.xml</param-value>
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</context-param>
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<listener>
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<listener-class>
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org.springframework.web.context.ContextLoaderListener
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</listener-class>
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</listener>
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<!-- secure web app context -->
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<servlet>
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<servlet-name>secure-webapp</servlet-name>
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<servlet-class>
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org.springframework.web.servlet.DispatcherServlet
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</servlet-class>
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<load-on-startup>1</load-on-startup>
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<init-param>
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<param-name>contextConfigLocation</param-name>
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<param-value>/WEB-INF/secure-webapp-servlet.xml</param-value>
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</init-param>
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</servlet>
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<servlet-mapping>
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<servlet-name>secure-webapp</servlet-name>
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<url-pattern>/s/api/*</url-pattern>
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</servlet-mapping>
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<!-- normal web app context -->
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<servlet>
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<servlet-name>normal-webapp</servlet-name>
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<servlet-class>
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org.springframework.web.servlet.DispatcherServlet
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</servlet-class>
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<load-on-startup>1</load-on-startup>
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</servlet>
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<servlet-mapping>
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<servlet-name>normal-webapp</servlet-name>
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<url-pattern>/api/*</url-pattern>
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</servlet-mapping>
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<servlet>
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<servlet-name>test-mvc</servlet-name>
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<servlet-class>
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<html>
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<body>
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<h2>Hello World!</h2>
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</body>
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</html>
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