SpringMVC實戰(三種控制器方式)
阿新 • • 發佈：2019-02-18
1.前言
上篇部落格著重說了一下SpringMVC中幾種處理對映的方式,這篇部落格來說一下SpringMVC中幾種常用的控制器.
2.常用控制器
2.1 ParameterizableViewController(引數控制器)
<span style="font-size:18px;"><?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 "> <!-- 配置檔案形式要配置的組建:Controller,handlermapping(有預設規則),viewResolver,interceptor --> <!-- 檢視解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 配置從專案根目錄到一端路徑 --> <property name="prefix" value="/WEB-INF/jsp/" /> <!-- 檔案字尾名稱 --> <property name="suffix" value=".jsp" /> </bean> <!-- 使用簡單url來對映 --> <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/hello1.do">TestController</prop> <prop key="/hello1.do">toLogin</prop> <prop key="/comm.do">command</prop> <prop key="/form.do">form</prop> </props> </property> </bean> <!-- 引數控制器,需要配置相應的URL來對映 --> <bean id="toLogin" class="org.springframework.web.servlet.mvc.ParameterizableViewController"> <!-- 配置你所要跳轉到檢視的名稱 --> <!-- 要跳轉的檢視的名稱 --> <property name="viewName" value="index"></property> </bean> </beans> </span>
從上述程式碼中我們可以發現,引數控制器跟平常的控制器差不多,但是不能通過控制器名稱來訪問到,因為引數控制器是唯一的.2.2 AbstractCommandController(命令控制器)
<span style="font-size:18px;"><?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 "> <!-- 配置檔案形式要配置的組建:Controller,handlermapping(有預設規則),viewResolver,interceptor --> <!-- 檢視解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 配置從專案根目錄到一端路徑 --> <property name="prefix" value="/WEB-INF/jsp/" /> <!-- 檔案字尾名稱 --> <property name="suffix" value=".jsp" /> </bean> <!-- 使用簡單url來對映 --> <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/hello1.do">TestController</prop> <prop key="/hello1.do">toLogin</prop> <prop key="/comm.do">command</prop> <prop key="/form.do">form</prop> </props> </property> </bean> <!-- 命令控制器資訊,需要指定簡單的URL來對映 --> <bean class="com.url.controller.commController" id="command"> <!-- 指定收集物件的型別 --> <property name="commandClass" value="com.url.Entity.person"></property> </bean> </beans> </span>
接著來建立控制器資訊,需要繼承AbstractCommandController<span style="font-size:18px;">package com.url.controller; import java.util.HashMap; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.validation.BindException; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.AbstractCommandController; import com.url.Entity.person; public class commController extends AbstractCommandController { // 通過命令控制器,每次在訪問的時候,都會建立一個新的Person物件 @Override protected ModelAndView handle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, BindException arg3) throws Exception { //使用命令控制器來收集資料並且建立指定的物件 person person=new person(); System.out.println(person); //把後臺的資料和檢視封裝成ModelAndView Map<String, Object> map=new HashMap<String, Object>(); map.put("person", person); return new ModelAndView("index", map); } } </span>
3.3 FormController(表單控制器)通過表單控制器,可以把表單上的資料封裝成為一個物件,在控制器中收集到.
接著建立控制器<span style="font-size:18px;"><?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 "> <!-- 配置檔案形式要配置的組建:Controller,handlermapping(有預設規則),viewResolver,interceptor --> <!-- 檢視解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 配置從專案根目錄到一端路徑 --> <property name="prefix" value="/WEB-INF/jsp/" /> <!-- 檔案字尾名稱 --> <property name="suffix" value=".jsp" /> </bean> <!-- 使用簡單url來對映 --> <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/hello1.do">TestController</prop> <prop key="/hello1.do">toLogin</prop> <prop key="/comm.do">command</prop> <prop key="/form.do">form</prop> </props> </property> </bean> <!-- 表單控制器,需要指定相應的URL來對映 --> <bean class="com.url.controller.FormController" id="form"> <!-- 指定收集物件的型別 --> <property name="commandClass" value="com.url.Entity.person"></property> <!-- 表單頁面 --> <property name="formView" value="form"></property> <!-- 成功後的跳轉頁面操作 --> <property name="successView" value="success"></property> </bean> </beans> </span>
<span style="font-size:18px;">package com.url.controller; import org.springframework.web.servlet.mvc.SimpleFormController; import com.url.Entity.person; /*表單控制器*/ public class FormController extends SimpleFormController { /*通過此方法來收集表單上的資料,並自動封裝成一個物件*/ protected void doSubmitAction(Object command) throws Exception { person p=(person)command; System.out.println(p); super.doSubmitAction(command); } } </span>
3.小結
本篇部落格講解了一下SpringMVC中常用的控制器,通過控制器可以與View進行相應的傳值操作.