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：</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：${account.cardNo}<br/>
密碼：${account.password}
</body>
******************************************
web.xml
<servlet>
<servlet-name>Dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- servlet參數，此參數指定了Spring配置文件的位置，如果不配置，則默認為*/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.配置請求的controller的業務類 -->
<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controller 和 URL地址的映射關系 -->
<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props><!-- 可以添加很多映射關系， -->
<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會找
viewResolver 這個視圖解析器-->
<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;//創建時所繼承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.調用業務邏輯方法進行判斷，在這里弱化業務邏輯的處理，直接在controller里實現業務邏輯的判斷
Account account = getAccount(cardNo, password);
// 3.根據結果返回不同的ModelAndView對象
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;
}
}
********************************
創建實體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;//創建時所繼承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.調用業務邏輯方法進行判斷，在這里弱化業務邏輯的處理，直接在controller里實現業務邏輯的判斷
Account account = getAccount(cardNo, password);
// 3.根據結果返回不同的ModelAndView對象
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;
}
}
以上是創建源文件，下面我來簡單解析一下:
1。 由View層開始，看一下login.jsp，form內容會提交到login.do請求-->如何捕捉到login.do
我們需要由web.xml做起，
servlet-mapping配置會將以.do結尾的請求都交給DispatcherServlet來處理
<param-value>classpath:applicationContext.xml</param-value>
2. DispatcherServlet拿到這個請求之后他會到applicationContext.xml去找處理的controller，即()
<prop key="/login.do">loginController</prop>
3. loginController經過一系列的業務處理后會返回一個ModelAndView對象，
ModelAndView第一個對象參數是視圖名稱就是applicationContext注入的值
<property name="formView" value="login"></property>
4. 具體返回什么樣的視圖？DispatcherServlet會查找Viewresolve這個視圖解析器，視圖解析器找到了showAccount.jsp
shouAccount.jsp拿到model將后臺得到的數據顯示出來
5. model由loginController中的getAccount(cardNo, password);返回得到