1、springmvc請求過程

 

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
	xmlns="http://java.sun.com/xml/ns/j2ee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	
	<!-- 配置springmvc的分發器servlet -->
	<servlet>
		<servlet-name>action</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<!-- 通過初始化引數指定配置檔案的位置 -->
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:action-servlet.xml</param-value>
		</init-param>
	</servlet>
	<servlet-mapping>
		<servlet-name>action</servlet-name>
		<url-pattern>*.action</url-pattern>
	</servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>
 

public class HelloController extends AbstractController {
	
	@Override
	protected ModelAndView handleRequestInternal(HttpServletRequest request,
			HttpServletResponse response) throws Exception {
		System.out.println("HomeController-------" + req.getParameter("name"));
		
//向request域中新增東西      req.setAttribute("msg", "hello " + req.getParameter("name"));
		return new ModelAndView("home","msg","hello " + req.getParameter("name"));//home為邏輯名
	}

}
 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
						http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
						http://www.springframework.org/schema/mvc 
						http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 
						http://www.springframework.org/schema/context 
						http://www.springframework.org/schema/context/spring-context-3.0.xsd 
						http://www.springframework.org/schema/aop 
						http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 
						http://www.springframework.org/schema/tx 
						http://www.springframework.org/schema/tx/spring-tx-3.0.xsd ">
	<!-- bean名url處理器對映：預設 -->
	<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping">
		<!-- 優先順序 -->
		<property name="order" value="3"></property>
	</bean>
	
	<!-- 簡單url處理器對映 -->
	<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
		<property name="mappings">
			<map>
				<entry key="/abc.action" value="HelloController"></entry>
				<entry key="/save.action" value="HelloController"></entry>
			</map>
		</property>
		<property name="order" value="2"></property>
	</bean>
	
	<!-- 控制器類名處理器對映 -->
	<bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping">
		<property name="order" value="4"></property>
	</bean>
	
	<!-- 配置控制器HomeController -->
	<bean id="homeController" name="/home.action" class="cn.springmvc.controller.HelloController"></bean>
	
	<!-- 命令控制器 -->
	<bean name="/mycommand.action" class="cn.springmvc.controller.HelloController"></bean>
	
	<!-- 表單控制器 -->
	<bean name="/myform.action" class="cn.itcast.springmvc.controller.MyFormController">
		<!-- personForm為邏輯名 -->
		<property name="formView" value="personForm"></property>
		<!-- success為邏輯名 -->
		<property name="successView" value="success"></property>
	</bean>
	
	<!-- 嚮導表單控制器 -->
	<bean name="/mywizardform.action" class="cn.itcast.springmvc.controller.MyWizardFormController">
		<!-- 配置表單頁面 -->
		<property name="pages">
			<list>
				<value>/wizard/1</value>
				<value>/wizard/2</value>
				<value>/wizard/3</value>
			</list>
		</property>
	</bean>
	
	<!-- 檢視解析器 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<!-- 字首 /WEB-INF/jsps/home.jsp-->
		<property name="prefix" value="/WEB-INF/jsps/"></property>
		<!-- 字尾 -->
		<property name="suffix" value=".jsp"></property>
	</bean>
</beans>

首先，所有的請求都會經過DispatchserServlet處理，然後通過HandlerMapping(處理機對映)把具體的請求分發具體的controller(控制器)上，然後控制器執行預設方法，執行完後返回一個物件(也是就是ModelAndView類)，然後ModelAndView將請求返回給DispatcherSevlet在把這個具體的工作交個一個專門的元件去處理結果，也就是ViewResolver(檢視解析器--框架提供)去解析，解析完成後生成一個view(一般為jsp頁面)，最後將請求返回給客戶端瀏覽器

需要繼承AbstractCommandController類，並重寫handle方法
* 通過構造方法註冊命令類和命令名稱，如：
	public MyCommandController(){
		//註冊命令類
		this.setCommandClass(Person.class);
		//命令名稱
		this.setCommandName("person");
	}

public class PersonCommandController extends AbstractCommandController {

	public PersonCommandController(){
		//註冊命令類
		this.setCommandClass(Person.class);
		this.setCommandName("person");
	}
	protected ModelAndView handle(HttpServletRequest request,
			HttpServletResponse response, Object command, BindException errors)
			throws Exception {
		Person p = (Person) command;
		System.out.println(p.toString());
		
		return new ModelAndView("index");
	}

需要繼承SimpleFormController類，並重寫doSubmitAction方法
* 通過構造方法註冊命令類和命令名稱，如：
	public MyFormController(){
		this.setCommandClass(Person.class);
		this.setCommandName("person");
	}
* 在spring配置檔案中對錶單控制器進行配置，如：
	<!-- 表單控制器 -->
	<bean id="myFormController" name="/form.action" 			class="cn.itcast.controller.MyFormController">
		<property name="successView" value="success"/>
		<property name="formView" value="personForm"/>
	</bean>

public class PersonFormController extends SimpleFormController {
	
	//註冊命令物件
	public PersonFormController() {
		this.setCommandClass(Person.class);
		this.setCommandName("person");
	}

	protected void doSubmitAction(Object command) throws Exception {
		Person p = (Person) command;
		System.out.println(p.toString());
	}
}

WizardFormController(嚮導表單控制器)

* 需要繼承AbstractWizardFormController類，並重寫processFinish方法
*通過構造方法註冊命令類和命令名稱，如：
public MyWizardFormController(){
	this.setCommandClass(Person.class);
	this.setCommandName("person");
}
* 在spring配置檔案中對嚮導表單控制器進行配置，如：
<!-- 嚮導表單控制器 -->
<bean name="/wizard.action" id="myWizardFormControlle" class="cn.itcast.controller.MyWizardFormController">
<property name="pages">
<list>
<value>test/1</value>
<value>test/2</value>
<value>test/3</value>
</list>
</property>
</bean>

public class MyWizardFormController extends AbstractWizardFormController {
	public MyWizardFormController() {
		this.setCommandClass(Person.class);
		this.setCommandName("person");
	}	
	//處理完成
	protected ModelAndView processFinish(HttpServletRequest request,
			HttpServletResponse response, Object command, BindException errors)
			throws Exception {
		Person p = (Person) command; 
		System.out.println(p.toString());
		return new ModelAndView("index");
	}	
	//處理取消
	protected ModelAndView processCancel(HttpServletRequest request,
			HttpServletResponse response, Object command, BindException errors)
			throws Exception {
		return new ModelAndView("wizard/jPersonBaseInfo");
	}
}

<form action="mywizardform.action" method="post">
<table>
<tr>
	<td>age:</td>
	<td><input type="text" name=“age”/></td>
</tr>
<tr>
	<td></td>
	<td>
		<input type="submit" name="_target1" value="上一步" />
		<input type="submit" name="_cancel" value="取消" />
		<input type="submit" name="_finish" value="完成" />
	</td>
</tr>
</table>

</form>