首先我將所有需要的文件引入：
loging.jsp
$
{error}
<body>
<form method="post" action="login.do">
<table>
<tr>
<td colspan="2" align="center">賬戶登錄</td>
</tr>
<tr>
<td>卡號(hào)：</td>
<td><input type="text" name="cardNo" value=""></td>
</tr>
<tr>
<td>密碼：</td>
<td><input type="password" name="password" value=""></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" value="提交">
<input type="reset" value="重置"></td>
</tr>
</table>
</form>
</body>
****************************************
shouwCount.jsp
<body>
賬戶信息：<br/>
卡號(hào)：${account.cardNo}<br/>
密碼：${account.password}
</body>
******************************************
web.xml
<servlet>
<servlet-name>Dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- servlet參數(shù)，此參數(shù)指定了Spring配置文件的位置，如果不配置，則默認(rèn)為*/WEB-INF/<servlet name> , 其中<servlet name> 用Servlet名替換 -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>Dispatcher</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<display-name></display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
********************************************
applicationContext.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"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<!-- 1.配置請(qǐng)求的controller的業(yè)務(wù)類 -->
<bean id="loginController" class="com.sp.web.controller.LoginController">
<property name="formView" value="login"></property><!-- 3.配置jsp作為試圖解析器的操作使得 省去了".jsp" 字符-->
<property name="successView" value="showAccount"></property>
</bean>
<!-- 2.配置請(qǐng)controller 和 URL地址的映射關(guān)系 -->
<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props><!-- 可以添加很多映射關(guān)系， -->
<prop key="/login.do">loginController</prop> <!-- 以“login.do的方法映射” -->
</props>
</property>
</bean>
<!-- 3.配置jsp作為試圖解析器 -->
<!-- 返回什么樣的試圖呢？在web.xml文件中DispatcherServlet會(huì)找
viewResolver 這個(gè)視圖解析器-->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/"><!-- 給url地址加前綴 -->
</property>
<property name="suffix" value=".jsp"/><!-- 給url地址加后綴 -->
</bean>
</beans>
*****************************************
LoginController.java
package com.sp.web.controller;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;//創(chuàng)建時(shí)所繼承servlet
import org.springframework.web.servlet.mvc.AbstractController;
import com.sp.entity.Account;
public class LoginController extends AbstractController {
private String formView;//失敗
private String successView;
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request,
HttpServletResponse reponse) throws Exception {
// TODO Auto-generated method stub
// 1.獲取賬戶和密碼
String cardNo = request.getParameter("cardNo");
String password = request.getParameter("password");
// 2.調(diào)用業(yè)務(wù)邏輯方法進(jìn)行判斷，在這里弱化業(yè)務(wù)邏輯的處理，直接在controller里實(shí)現(xiàn)業(yè)務(wù)邏輯的判斷
Account account = getAccount(cardNo, password);
// 3.根據(jù)結(jié)果返回不同的ModelAndView對(duì)象
Map<String,Object> model = new HashMap<String, Object>();
if(account != null){
model.put("account", account);
return new ModelAndView(getSuccessView(),model);
}else{
model.put("error", "卡號(hào)和密碼不正確");
return new ModelAndView(getFormView(),model);
}
}
public Account getAccount(String cardNo,String password){
if(cardNo.equals("123") && password.equals("123")){
Account account = new Account();
account.setCardNo("cardNo");
account.setBalance(0.3f);
return account;
}else{
return null;
}
}
public String getFormView() {
return formView;
}
public void setFormView(String formView) {
this.formView = formView;
}
public String getSuccessView() {
return successView;
}
public void setSuccessView(String successView) {
this.successView = successView;
}
}
********************************
創(chuàng)建實(shí)體bean，Account.java
package com.sp.web.controller;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;//創(chuàng)建時(shí)所繼承servlet
import org.springframework.web.servlet.mvc.AbstractController;
import com.sp.entity.Account;
public class LoginController extends AbstractController {
private String formView;//失敗
private String successView;
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request,
HttpServletResponse reponse) throws Exception {
// TODO Auto-generated method stub
// 1.獲取賬戶和密碼
String cardNo = request.getParameter("cardNo");
String password = request.getParameter("password");
// 2.調(diào)用業(yè)務(wù)邏輯方法進(jìn)行判斷，在這里弱化業(yè)務(wù)邏輯的處理，直接在controller里實(shí)現(xiàn)業(yè)務(wù)邏輯的判斷
Account account = getAccount(cardNo, password);
// 3.根據(jù)結(jié)果返回不同的ModelAndView對(duì)象
Map<String,Object> model = new HashMap<String, Object>();
if(account != null){
model.put("account", account);
return new ModelAndView(getSuccessView(),model);
}else{
model.put("error", "卡號(hào)和密碼不正確");
return new ModelAndView(getFormView(),model);
}
}
public Account getAccount(String cardNo,String password){
if(cardNo.equals("123") && password.equals("123")){
Account account = new Account();
account.setCardNo("cardNo");
account.setBalance(0.3f);
return account;
}else{
return null;
}
}
public String getFormView() {
return formView;
}
public void setFormView(String formView) {
this.formView = formView;
}
public String getSuccessView() {
return successView;
}
public void setSuccessView(String successView) {
this.successView = successView;
}
}
以上是創(chuàng)建源文件，下面我來(lái)簡(jiǎn)單解析一下:
1。 由View層開始，看一下login.jsp，form內(nèi)容會(huì)提交到login.do請(qǐng)求-->如何捕捉到login.do
我們需要由web.xml做起，
servlet-mapping配置會(huì)將以.do結(jié)尾的請(qǐng)求都交給DispatcherServlet來(lái)處理
<param-value>classpath:applicationContext.xml</param-value>
2. DispatcherServlet拿到這個(gè)請(qǐng)求之后他會(huì)到applicationContext.xml去找處理的controller，即()
<prop key="/login.do">loginController</prop>
3. loginController經(jīng)過(guò)一系列的業(yè)務(wù)處理后會(huì)返回一個(gè)ModelAndView對(duì)象，
ModelAndView第一個(gè)對(duì)象參數(shù)是視圖名稱就是applicationContext注入的值
<property name="formView" value="login"></property>
4. 具體返回什么樣的視圖？DispatcherServlet會(huì)查找Viewresolve這個(gè)視圖解析器，視圖解析器找到了showAccount.jsp
shouAccount.jsp拿到model將后臺(tái)得到的數(shù)據(jù)顯示出來(lái)
5. model由loginController中的getAccount(cardNo, password);返回得到