public class MyCommandController extends AbstractCommandController{//无参构造方法public MyCommandController(){//把UserModel模型绑定到命令对象command上this.setCommandClass(UserModel.class);//简单的数据校验器，校验的结果为errors,校验规则是由其实例对象中确定this.setValidator(new UserValidator());}/*** 处理方法*/@Overrideprotected ModelAndView handle(HttpServletRequest request,HttpServletResponse response, Object command, BindException errors)throws Exception {//提供一个返回的模型视图对象ModelAndView mav=new ModelAndView();//组装要在页面上显示的数据UserModel user=(UserModel) command;mav.addObject("user", user);//指定逻辑视图名mav.setViewName("command");//校验信息org.springframework.validation.BeanPropertyBindingResult: 0 errorsSystem.out.println("校验信息"+errors.getMessage());return mav;}
}

public class UserValidator implements Validator {/*** 验证数据模型是否绑定到命令对象了*/public boolean supports(Class<?> clazz) {return UserModel.class.equals(clazz);}/*** 进行数据验证*/public void validate(Object obj, Errors errors) {ValidationUtils.rejectIfEmpty(errors, "userName", "用户名为空了，不OK");UserModel user=(UserModel) obj;if(null==user.getPassword()||"".equals(user.getPassword())){errors.rejectValue("password", "密码为空，异常！");}}
}

//进行表单数据回显@Overrideprotected Object formBackingObject(HttpServletRequest request)throws Exception {//组装页面要展示的数据UserModel user=new UserModel();user.setUserName("张三");return user;}//提供表单需要的其他数据@Overrideprotected Map referenceData(HttpServletRequest request) throws Exception {//提供返回对象Map<String,String> resultMap=new HashMap<String, String>();resultMap.put("age", "20");return resultMap;}//处理表单提交请求@Overrideprotected void doSubmitAction(Object command) throws Exception {UserModel user=(UserModel) command;System.out.println(user.toString());}

#### 三、MultiActionController(多功能控制器)
- 支持在一个控制器里面添加多个功能处理方法
- 可以通过方法名解析器或委托对象模式将多个请求的处理方法放置到一个控制器里
- 默认使用InternalPathMethodNameResolver解析URL和方法名的映射实现步骤：
1. 继承MultiActionController
2. 提供增删改查的方法（模拟）
3. 配置文件
~~~java
<bean name="/user/*" class="cn.kgc.controllers.MyMultiController"/>

public class MyMultiController extends MultiActionController {//模拟一个数据库private Map<String,Object> dataMap=new HashMap<String, Object>();//增加public ModelAndView add(HttpServletRequest request,HttpServletResponse response, UserModel user) {// 提供一个返回对象ModelAndView mav = new ModelAndView();// 如果是get请求，返回到添加页面if ("GET".equals(request.getMethod())) {mav.setViewName("add");return mav;}if ("POST".equals(request.getMethod())) {// 如果是post请求，添加数据到dataMapdataMap.put(user.getUserName(), user);return list(request,response,user);}return null;}//删除public ModelAndView delete(HttpServletRequest request,HttpServletResponse response, UserModel user){//删除数据dataMap.remove(user.getUserName());return list(request,response,user);}//修改public ModelAndView update(HttpServletRequest request,HttpServletResponse response, UserModel user){ModelAndView mav=new ModelAndView();//如果是get请求 那么把要修改的数据显示到修改页面（获取）if("GET".equals(request.getMethod())){//把要修改的user对象拿出来UserModel targetUser = (UserModel) dataMap.get(user.getUserName());mav.addObject("targetUser", targetUser);mav.setViewName("update");return mav;}//如果是post请求，将目标数据进行修改，然后调用查询方法进行展示if("POST".equals(request.getMethod())){UserModel updateUser = (UserModel) dataMap.get(user.getUserName());updateUser.setPassword(user.getPassword());//将更新后的数据存到map中dataMap.put(user.getUserName(), updateUser);return list(request,response,user);}return null;}//查询public ModelAndView list(HttpServletRequest request,HttpServletResponse response,UserModel user){// 提供一个返回对象ModelAndView mav = new ModelAndView();mav.addObject("dataMap", dataMap);mav.setViewName("list");return mav;}
}