下面是一个SimpleFormController的实例

   下面是一个SimpleFormController的实例，虽然有些地方显得吹毛求疵，但主要是为了表达一个完整的流程。首先先看配置文件，web.xml就不说了，下面的是/WEB-INF/mvc-config.xml: <?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"    "http://www.springframework.org/dtd/spring-beans.dtd"><beans> <!--InternalResourceViewResolver--> <bean id="viewResolver"  class="org.springframework.web.servlet.view.InternalResourceViewResolver">  <property name="prefix">   <value>/WEB-INF/jsp/</value>  </property>  <property name="suffix">   <value>.jsp</value>  </property> </bean>  <!--SimpleUrlHandlerMapping--> <bean id="urlHandlerMapping"  class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">  <property name="mappings">   <props>      <prop key="/user.htm">userController</prop>   </props>  </property> </bean></beans>

然后是/WEB-INF/controller-config.xml:

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"    "http://www.springframework.org/dtd/spring-beans.dtd"><beans>   <bean id="userValidator" class="com.yangsq.validator.UserValidator"/>  <bean id="userController"  class="com.yangsq.controller.UserController">  <property name="commandName">   <value>command</value>  </property>  <property name="commandClass">   <value>com.yangsq.domain.User</value>  </property>  <property name="validator">   <ref bean="userValidator" />  </property>  <property name="formView">   <value>user</value>  </property>  <property name="successView">   <value>hello</value>  </property> </bean></beans>

   这里需要对上面的配置文件进行说明。commandName属性的设置是为了可以在页面中使用Spring tag，对业务流程没有影响，如果不想使用Spring tag，则这个属性可以没有。commandClass指定了封装表单的类，注意，要指定完整的路径，不能只指定一个类名，也不能<ref .../>。validator的设定说明了要使用验证器。formView和successView这两个属性设定了转向的页面，它们是父类所具有的，所以不需要在你的controller中再注入了。

   下面是验证器： import org.springframework.validation.Errors;import org.springframework.validation.Validator;

import com.yangsq.domain.User;

public class UserValidator implements Validator{  public boolean supports(Class clazz) {     return clazz.equals(User.class); }  public void validate(Object obj, Errors err) {     User user = (User) obj;     if (user.getPhone().length() < 7) {      user.setCreateTime(null);      err.reject("phoneErr", "电话号码位数要大于7");     }else if (user.getAge() <= 0) {      user.setCreateTime(null);      err.reject("ageErr", "年龄要大于0");     } }} 

验证器实现了Validator借口，supports和validate这两个方法是必须实现的。验证器的主要任务是对表单类进行验证，这时请求的数据已经封装到表单类里了。

  下面是表单类:

public class User { private String account; private String phone; private int age; private String city; private Date createTime;  public String getAccount() {  return account; } public void setAccount(String account) {  this.account = account; } public int getAge() {  return age; } public void setAge(int age) {  this.age = age; } public String getPhone() {  return phone; } public void setPhone(String phone) {  this.phone = phone; } public Date getCreateTime() {  return createTime; } public void setCreateTime(Date createTime) {  this.createTime = createTime; } public String getCity() {  return city; } public void setCity(String city) {  this.city = city; }} 属性包括用户名称，电话，年龄，城市和创建日期。此外，为了表达一个完成的演示，还创建了一个city类： public class City { private String cityName; private String cityNo; public String getCityName() {  return cityName; } public void setCityName(String cityName) {  this.cityName = cityName; } public String getCityNo() {  return cityNo; } public void setCityNo(String cityNo) {  this.cityNo = cityNo; }}

下面就是这个例子的主角，UserController：

public class UserController extends SimpleFormController {  protected Map referenceData(HttpServletRequest req) throws Exception {  Map map = new HashMap();    List cityList = new ArrayList();  City city1 = new City();  city1.setCityName("BeiJing");  city1.setCityNo("010");  cityList.add(city1);  City city2 = new City();  city2.setCityName("ShangHai");  city2.setCityNo("020");  cityList.add(city2);    map.put("cityList", cityList);  return map; }

 protected void onBind(HttpServletRequest req, Object obj) throws Exception {  User user = (User) obj;  //format the infor     user.setAccount(user.getAccount().trim());     user.setPhone(user.getPhone().trim()); }

 protected void onBindAndValidate(HttpServletRequest req, Object obj, BindException err) throws Exception {  User user = (User) obj;  user.setCreateTime(new Date()); }

 protected ModelAndView onSubmit(Object obj) throws Exception {  User user = (User) obj;  return new ModelAndView(this.getSuccessView(), "user", user); }} 

下面是使用到的页面 user.jsp的主要部分（表单）：

<FORM action="user.htm" method="post"> <TABLE>  <TBODY>   <TR>    <TD>     <spring:bind path="command.account">      用户名：<INPUT name="${status.expression}" type="text" value="${status.value}"/>     </spring:bind>    </TD>   </TR>   <TR>    <TD>     <spring:bind path="command.age">      年龄：<INPUT name="${status.expression}" type="text" value="${status.value}"/>     </spring:bind>    </TD>   </TR>   <TR>    <TD>     <spring:bind path="command.phone">      电话号码：<INPUT name="${status.expression}" type="text"  value="${status.value}"/>     </spring:bind>    </TD>   </TR>   <TR>    <TD>     <spring:bind path="command.city">      城市：      <SELECT name="${status.expression}">       <c:forEach items="${cityList}" var="city" varStatus="loopStep">        <OPTION value="${city.cityNo}" <c:if test="${city.cityNo == status.value}">selected</c:if>>         <c:out value="${city.cityName}"/>        </OPTION>       </c:forEach>      </SELECT>     </spring:bind>    </TD>   </TR>   <TR>    <TD>     <spring:bind path="command.*">      <c:out value="${status.errorMessage}"/>     </spring:bind>    </TD>   </TR>   <TR>    <TD align="center">     <INPUT type="submit" value="提交" />    </TD>   </TR>  </TBODY> </TABLE></FORM>

hello.jsp的主要部分：

<TABLE>    <TBODY>     <TR>      <TD>       User infor:      </TD>     </TR>     <TR>      <TD>       <c:out value="${user.account}" />      </TD>     </TR>     <TR>      <TD>       <c:out value="${user.age}" />      </TD>     </TR>     <TR>      <TD>       <c:out value="${user.phone}" />      </TD>     </TR>     <TR>      <TD>       <c:out value="${user.city}" />      </TD>     </TR>     <TR>      <TD>       <c:out value="${user.createTime}" />      </TD>     </TR>    </TBODY> </TABLE>

在 SimpleFormController（下）会结合效果图，说明一下整个流程：