Spring MVC – 03 – Handler Mapping
Merhaba Arkadaslar,
Bu bolumde HandlerMapping kavramini inceleyecegiz . HandlerMapping , gelen istegin/request , hangi Controller tarafindan karsilanacagini/handle tanimlamamizi saglar.
Bir Spring Web Application’ina ilk istek geldiginde istek DispatcherServlet tarafindan karsilanmaktadir. (handle request)
Sonrasinda bu istek , gercekten ilgili istegi karsilayacak Controller’a yonlendirilmelidir. (dispatch)
DispatcherServlet , ilgili Controller’a istegi yonlendirmek icin HandlerMapping implementation’inindan yararlanmaktadir.
HandlerMapping.java
package org.springframework.web.servlet;
import javax.servlet.http.HttpServletRequest;
public interface HandlerMapping {
HandlerExecutionChain getHandler(HttpServletRequest request)
throws Exception;
}
Oncelikle web.xml dosyamiza , yeni uygulamamiz icin kullanacagimiz XML konfigurasyon dosyamizin bilgisini ekleyelim. Onceki ornekte kullandigimiz 01.appContext.xml i yorum satiri haline getirebiliriz;
web.xml
servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value> <!--/WEB-INF/01.appContext.xml --> /WEB-INF/02.00.appContext.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet>
02.00.appContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
BeanNameUrlHandlerMapping
BeanNameUrlHandlerMapping , varsayilan/default handler mapping sinifidir. Spring tanimlimli bir handler mapping bulamadiginda BeanNameUrlHandlerMapping ‘i kullanacaktir.
Controller siniflarimizi tanimlayalim , burada diger bir yaklasim olarak AbstractController sinifini kalitacagiz.
Page1Controller.java
package _02_01.beanNameUrlHandlerMapping.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;
public class Page1Controller extends AbstractController {
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
throws Exception {
ModelAndView modelAndView = new ModelAndView("02.01.beanNameHandlerMapping.view/myPage1");
modelAndView.addObject("message", "Hello Page1");
return modelAndView;
}
}
AbstractController abstract sinifini kalittigimizda handleRequestInternal metodunu override etmemiz gereklidir.
ModelAndView objemizi olusturuyoruz , view bilgisi olarak 02.01.beanNameHandlerMapping.view dizininde yer alan myPage1.jsp dosyasini veriyoruz. Sonuna jsp yazmadigimiza dikkat edelim. 02.00.appContext.xml dosyasinda suffix olarak .jsp bilgisini zaten ekledik.
myPage1.jsp
...
<body>
<h2>${message}</h2>
</body>
...
Page2Controller ve Page3Controller sinifimiz da ayni sekilde tanimliyoruz. myPage2.jsp ve myPage3.jsp dosyasini view olarak kullacak sekilde duzenliyoruz.
Page2Controller.java
package _02_01.beanNameUrlHandlerMapping.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;
public class Page2Controller extends AbstractController {
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
throws Exception {
ModelAndView modelAndView = new ModelAndView("02.01.beanNameHandlerMapping.view/myPage2");
modelAndView.addObject("message", "Hello Page2");
return modelAndView;
}
}
Page3Controller.java
package _02_01.beanNameUrlHandlerMapping.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;
public class Page3Controller extends AbstractController {
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
throws Exception {
ModelAndView modelAndView = new ModelAndView("02.01.beanNameHandlerMapping.view/myPage3");
modelAndView.addObject("message", "Hello Page3");
return modelAndView;
}
}
02.01.beanNameUrlHandlerMapping.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" />
<bean name="/page1" class="_02_01.beanNameUrlHandlerMapping.controller.Page1Controller" />
<bean name="/page2" class="_02_01.beanNameUrlHandlerMapping.controller.Page2Controller" />
<bean name="/page3*" class="_02_01.beanNameUrlHandlerMapping.controller.Page3Controller" />
</beans>
Oncelikle BeanNameUrlHandlerMapping sinifi icin bean tanimini gerceklestiriyoruz. Sonrasinda tanimladigimiz Controller siniflarimiz icin bean tanimini gerceklestiriyoruz.
Burada dikkat edecek olursak /page1 , /page2 ve /page3* seklinde name attribute bilgisi verdik.
NOT : BeanNameUrlHandlerMapping icin bean name / ile baslamalidir.
02.00.appContext.xml
... <import resource="02.01.beanNameUrlHandlerMapping.xml"/> ...
02.00.appContext.xml konfigurasyon dosyamiza 02.01.beanNameUrlHandlerMapping.xml dosyamizi import edelim.
Ornegimizi calistiralim ;
“/page1” , Page1Controller.java sinifi tarafindan karsilanacaktir. View olarak myPage1.jsp kullanilacaktir.
http://localhost:8080/injavawetrust.springmvc/page1
“/page2” , Page2Controller.java sinifi tarafindan karsilanacaktir. View olarak myPage2.jsp kullanilacaktir.
http://localhost:8080/injavawetrust.springmvc/page2
“/page3” , Page3Controller.java sinifi tarafindan karsilanacaktir. View olarak myPage3.jsp kullanilacaktir.
http://localhost:8080/injavawetrust.springmvc/page3
bean name olarak “/page3*” oldugu icin yani * wildcard kullanildigi icin “/page3XXXX” URL bilgisi de Page3Controller.java sinifi tarafindan karsilanacaktir.
SimpleUrlHandlerMapping
SimpleUrlHandlerMapping tanimininda setMappings metodu yer almaktadir.
public void setMappings(Properties mappings) {
CollectionUtils.mergePropertiesIntoMap(mappings, this.urlMap);
}
Bean taniminda ve etiketlerini kullanarak key olarak url bilgisi , value olarak controller bilgisini verebiliriz.
Oncelikle Controller siniflarimizi tanimlayalim ;
LoginController.java
package _02_02.simpleUrlHandlerMapping.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;
public class LoginController extends AbstractController {
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
throws Exception {
ModelAndView modelAndView = new ModelAndView("02.02.simpleUrlHandlerMapping.view/myLoginPage");
modelAndView.addObject("message", "Hello Login Page");
return modelAndView;
}
}
LogoutController.java
package _02_02.simpleUrlHandlerMapping.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;
public class LogoutController extends AbstractController {
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
throws Exception {
ModelAndView modelAndView = new ModelAndView("02.02.simpleUrlHandlerMapping.view/myLogoutPage");
modelAndView.addObject("message", "Hello Logout Page");
return modelAndView;
}
}
02.02.simpleUrlHandlerMapping.xml
<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/login">loginController</prop>
<prop key="/index">loginController</prop>
<prop key="/welcome">loginController</prop>
<prop key="/logout">logoutController</prop>
<prop key="/exit">logoutController</prop>
</props>
</property>
</bean>
<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<value>
/guest=loginController
/newuser=loginController
</value>
</property>
</bean>
<bean id="loginController" class="_02_02.simpleUrlHandlerMapping.controller.LoginController" />
<bean id="logoutController" class="_02_02.simpleUrlHandlerMapping.controller.LogoutController" />
/login /index /welcome URL adresleri LoginController tarafindan karsilanacaktir.
LoginController icin id bilgisi “loginController” olarak tanimliyoruz.
/logout ve /exit URL adresleri LogoutController tarafindan karsilanacaktir.
LogoutController icin id bilgisini “logoutController” olarak tanimliyoruz.
SimpleUrlHandlerMapping icin 2.yontemle de tanimlama yapabiliriz.
/guest ve /newuser , loginController tarafindan karsilanacaktir.
02.00.appContext.xml
... <!-- <import resource="02.01.beanNameUrlHandlerMapping.xml"/> --> <import resource="02.02.simpleUrlHandlerMapping.xml"/> ...
Ornegimizi calistiralim , /login , /guest /logout icin test ettigimizde ;
http://localhost:8080/injavawetrust.springmvc/login http://localhost:8080/injavawetrust.springmvc/index http://localhost:8080/injavawetrust.springmvc/welcome http://localhost:8080/injavawetrust.springmvc/guest http://localhost:8080/injavawetrust.springmvc/newuser http://localhost:8080/injavawetrust.springmvc/logout http://localhost:8080/injavawetrust.springmvc/exit
ControllerClassNameHandlerMapping
ControllerClassNameHandlerMapping , tanimladigimiz Controller siniflari icin “Controller” ekini kaldirir. Basina / karakteri ekler ve kucuk karakter olacak sekilde URL bilgisine uygun sekilde mapping uygulanir.
Ornegin CustomerOrderController icin ; Controller prefix silinir ve kucuk harf olacak sekilde /customerorder URL olacaktir.
CustomerOrderController.java
package _02_03.controllerClassNameHandlerMapping.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;
public class CustomerOrderController extends AbstractController {
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
throws Exception {
ModelAndView modelAndView = new ModelAndView("02.03.controllerClassNameHandlerMapping.view/myOrderPage");
modelAndView.addObject("message", "Hello OrderPage");
return modelAndView;
}
}
CustomerTransactionController.java
package _02_03.controllerClassNameHandlerMapping.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;
public class CustomerTransactionController extends AbstractController{
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
throws Exception {
ModelAndView modelAndView = new ModelAndView("02.03.controllerClassNameHandlerMapping.view/myTransactionPage");
modelAndView.addObject("message", "Hello TransactionPage");
return modelAndView;
}
}
02.03.controllerClassNameHandlerMapping.xml
<bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping" /> <bean class="_02_03.controllerClassNameHandlerMapping.controller.CustomerOrderController" /> <bean class="_02_03.controllerClassNameHandlerMapping.controller.CustomerTransactionController" />
bean taniminda sadece class bilgisini vermemiz yeterli olacaktir.
02.00.appContext.xml
... <!-- <import resource="02.01.beanNameUrlHandlerMapping.xml"/> <import resource="02.02.simpleUrlHandlerMapping.xml"/> --> <import resource="02.03.controllerClassNameHandlerMapping.xml"/> ...
Ornegimizi calistiralim ;
http://localhost:8080/injavawetrust.springmvc/customerorder http://localhost:8080/injavawetrust.springmvc/customertransaction
ControllerBeanNameHandlerMapping
ControllerBeanNameHandlerMapping , BeanNameUrlHandlerMapping gibi calisir.
BeanNameUrlHandlerMapping de URL bilgisi / ile baslamak zorundadir.
ReportController.java
package _02_04.controllerBeanNameHandlerMapping.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;
public class ReportController extends AbstractController{
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
throws Exception {
ModelAndView modelAndView = new ModelAndView("02.04.controllerBeanNameHandlerMapping.view/myReportPage");
modelAndView.addObject("message", "Hello ReportPage");
return modelAndView;
}
}
02.04.controllerBeanNameHandlerMapping.xml
<bean class="org.springframework.web.servlet.mvc.support.ControllerBeanNameHandlerMapping" /> <bean name="report" class="_02_04.controllerBeanNameHandlerMapping.controller.ReportController" />
02.00.appContext.xml
... <!-- <import resource="02.01.beanNameUrlHandlerMapping.xml"/> <import resource="02.02.simpleUrlHandlerMapping.xml"/> <import resource="02.03.controllerClassNameHandlerMapping.xml"/> --> <import resource="02.04.controllerBeanNameHandlerMapping.xml"/> ...
Ornegimizi calistirdigimizda ;
http://localhost:8080/injavawetrust.springmvc/report
Github kaynak kodlar / source folder
Injavawetrust-springmvc-tutorial
Yazimi burada sonlandiriyorum.
Herkese Bol Javali Gunler dilerim.
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