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: