在上次的MVC基础上，我们准备给Controller增加Model，为此创建一个Account Bean Class：
public class Account implements java.io.Serializable {
private String username;
private String password;
public String getUsername() { return this.username; }
public void setUsername(String username) { this.username = username; }
public String getPassword() { return this.password; }
public void setPassword(String password) { this.password = password; }
}
然后修改SpringappController：
public class SpringappController implements Controller {
private Account account;
public Account getUserAccount() { return this.account; }
public void setUserAccount(Account account) { this.account = account; }
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
return new ModelAndView("view.jsp", "model", account.getUsername());
}
}
为了向SpringappController注入Bean，我们修改配置文件springapp-servlet.xml：
<!-- 申明一个Account Bean -->
<bean id="adminAccount" class="Account">
<property name="username">
<value>administrator</value>
</property>
<property name="password">
<value>1234567</value>
</property>
</bean>
<bean id="springappController" class="SpringappController">
<!-- 注入到Controller -->
<property name="userAccount">
<ref bean="adminAccount" />
</property>
</bean>
OK，运行Ant，然后启动Tomcat，结果输出：
Result: administrator
注入成功！但是在Controller中放一个Account肯定是不合逻辑的，我们准备做一个用户登录功能，为此创建一个AccountManager Bean：
public class AccountManager implements java.io.Serializable {
Account getAccount(String username, String password) {
// TODO...
Account account = new Account();
account.setUsername(username);
account.setPassword(password);
return account;
}
}
然后把SpringappController改为：
public class SpringappController implements Controller {
private AccountManager manager;
public AccountManager getManager() { return this.manager; }
public void setManager(AccountManager manager) { this.manager = manager; }
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
String username = request.getParameter("username");
String password = request.getParameter("password");
return new ModelAndView("view.jsp", "model",
manager.getAccount(username, password).getUsername());
}
}
修改springapp-servlet.xml：
<bean id="accountManager" class="AccountManager" />
<bean id="springappController" class="SpringappController">
<property name="manager">
<ref bean="accountManager" />
</property>
</bean>
编译，运行，输入：http://localhost:8080/springmvc/hello.c?username=xuefeng&password=1234
结果显示：
Result: xuefeng
OK，现在只要创建一个html form，Post到Controller然后在AccountManager中验证Username和Password就可以了。 
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