Lets see the example.
1. Controller in Application
package com.doj.spring.web.controller; import java.util.HashMap; import java.util.Map; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import com.doj.spring.web.bean.Student; import com.doj.spring.web.exception.StudentNotFoundException; @Controller public class WebController { static Map<String, Student> map = new HashMap<String, Student>(); @RequestMapping("/") public String home(){ Student student = new Student(); student.setFname("Dinesh"); student.setLname("Rajput"); student.setAge("29"); student.setAddress("Noida"); student.setCourse("MS"); map.put("1000", student); return "home"; } @RequestMapping("/doj-student-{rollNumber}") public String dojStudentByRollNumber(ModelMap model, @PathVariable(value="rollNumber") String rollNumber){ Student student = map.get(rollNumber); if (student == null) { throw new StudentNotFoundException("Student Not Found", "ERROR:404"); } String name = student.getFname()+" "+student.getLname()+" "+student.getAddress()+" "+student.getCourse(); model.put("name", name); return "home"; } @ExceptionHandler(StudentNotFoundException.class) public ModelAndView handleStudentNotFoundException(StudentNotFoundException ex) { Map<String, StudentNotFoundException> model = new HashMap<String, StudentNotFoundException>(); model.put("exception", ex); return new ModelAndView("student.error.400", model); } @ExceptionHandler(Exception.class) public ModelAndView handleException(Exception ex) { Map<String, Exception> model = new HashMap<String, Exception>(); model.put("exception", ex); return new ModelAndView("student.error.500", model); } }
2. Add Custom Exception
package com.doj.spring.web.exception; import org.springframework.http.HttpStatus; import org.springframework.web.bind.annotation.ResponseStatus; @ResponseStatus(value=HttpStatus.NOT_FOUND, reason="Student Not Found") public class StudentNotFoundException extends RuntimeException{ /** * */ private static final long serialVersionUID = -2581975292273282583L; String errorMessage; String errorCode; public StudentNotFoundException(String errorMessage, String errorCode) { super(); this.errorMessage = errorMessage; this.errorCode = errorCode; } public String getErrorMessage() { return errorMessage; } public void setErrorMessage(String errorMessage) { this.errorMessage = errorMessage; } public String getErrorCode() { return errorCode; } public void setErrorCode(String errorCode) { this.errorCode = errorCode; } }
3. Student Bean Class
package com.doj.spring.web.bean; public class Student { String fname; String lname; String address; String course; String age; public String getFname() { return fname; } public void setFname(String fname) { this.fname = fname; } public String getLname() { return lname; } public void setLname(String lname) { this.lname = lname; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } public String getCourse() { return course; } public void setCourse(String course) { this.course = course; } public String getAge() { return age; } public void setAge(String age) { this.age = age; } }
4. Views JSP
home.jsp
View for Success Page
<h1>${name} Welcome to DOJ Classes for Spring MVC!!!</h1>
Error Page View
400.jsp
<h1>${exception.errorCode} - ${exception.errorMessage} !!!</h1>
mainTemplate.jsp
<!DOCTYPE h1 PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <%@taglib uri="http://tiles.apache.org/tags-tiles" prefix="tiles" %> <html> <head> <title><tiles:insertAttribute name="title"/></title> <style> .error { color: red; font-weight: bold; } </style> </head> <body style="text-align: center;"> <div id="header" style="height: 10%;background-color: gray;"><tiles:insertAttribute name="header"/></div> <div id="body" style="height: 70%; background-color: aqua;padding-top: 40px;"><tiles:insertAttribute name="body"/></div> <div id="footer" style="height: 10%;background-color: gray;"><tiles:insertAttribute name="footer"/></div> </body> </html>
5. Spring Configurations based on Java Configuration
package com.doj.spring.web.config; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.ViewResolver; import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer; import org.springframework.web.servlet.config.annotation.EnableWebMvc; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; import org.springframework.web.servlet.view.tiles3.TilesConfigurer; import org.springframework.web.servlet.view.tiles3.TilesViewResolver; @Configuration @EnableWebMvc @ComponentScan(basePackages={"com.doj.spring.web.controller"}) public class SpringWebConfiguration extends WebMvcConfigurerAdapter{ @Bean public ViewResolver viewResolver() { return new TilesViewResolver(); } @Bean public TilesConfigurer tilesConfigurer() { TilesConfigurer tiles = new TilesConfigurer(); tiles.setDefinitions(new String[] { "/WEB-INF/view/tiles/tiles-def.xml" }); tiles.setCheckRefresh(true); return tiles; } //Configure for default static content handling @Override public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) { configurer.enable(); } }
6. Deployment Descriptor based on java configuration
package com.doj.spring.web; import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer; import com.doj.spring.web.config.SpringWebConfiguration; //this file is equivalent to web.xml public class WebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer{ //Configuration for non web components like services, daos, repos, etc. @Override protected Class<?>[] getRootConfigClasses() { return null; } //Specifying Spring MVC configuration class "SpringWebConfiguration.class" it equivalent to *-servlet.xml file @Override protected Class<?>[] getServletConfigClasses() { return new Class<?>[]{SpringWebConfiguration.class}; } //Mapping dispatcher server to "/" i.e. Servlet Mapping in the web.xml @Override protected String[] getServletMappings() { return new String[]{"/"}; } }
All files related this example is not mention here for whole application you can download the zip of working application.
SpringMVCExceptionHandlingExample
7. Lets see demo this application
1. Welcome Page
http://localhost:8080/SpringMVCExceptionHandlingExample/
2. Error Page
http://localhost:8080/SpringMVCExceptionHandlingExample/doj-student-10001
- Spring MVC Web Tutorial
- Spring MVC Interview Questions
- MVC Design Pattern
- Spring MVC DispatcherServlet
- Spring MVC WebApplicationContext and Root Application Context
- Spring MVC @Controller Annotation
- Spring MVC @RequestMapping Annotation
- Spring MVC @RequestParam Annotation
- Spring MVC ContextLoaderListener
- Spring MVC @RequestParam and @PathVariable annotations
- Spring MVC Hello World Example
- Spring MVC Exception Handling Example
- Spring MVC with Hibernate CRUD Example
- Spring MVC Tiles Plugin with Example
- Spring MVC Interceptor with example
- Spring MVC with MongoDB CRUD Example
- Spring MVC Internationalization & Localization with Example