springMVC3.2实现后台校验

      最近学习了一下springmvc中后台校验功能的实现，特别写了一个demo以备以后查看，主要使用注解方式来进行配置。

1、在jsp页面引入spring的标签

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>

2、建立数据提交表单

<form:form method="post" action="reg.do" commandName="userBean">
			<table>
				<tr>
					<td>
						UserName:
						<font color="red"> <form:errors path="userName"></form:errors>
						</font>
					</td>

				</tr>
				<tr>
					<td>
						<form:input path="userName"/>
					</td>

				</tr>
				
				<tr>
					<td>
						Age:
						<font color="red"> <form:errors path="age"></form:errors>
						</font>
					</td>

				</tr>
				<tr>
					<td>
						<form:input path="age"/>
					</td>

				</tr>
				
				<tr>
					<td>
						password:
						<font color="red"> <form:errors path="password"></form:errors>
						</font>
					</td>

				</tr>
				<tr>
					<td>
						<form:password path="password"/>
					</td>

				</tr>
				
				<tr>
					<td>
						Confirm Password:
						<font color="red"> <form:errors path="confirmPassword"></form:errors>
						</font>
					</td>

				</tr>
				<tr>
					<td>
						<form:password path="confirmPassword"/>
					</td>

				</tr>
				<tr>
					<td>
						<input type="submit" value="submit">
					</td>

				</tr>

			</table>

		</form:form>

3、新建表单对象（javabean）

package springapp.model;

import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

import org.hibernate.validator.constraints.NotEmpty;
import org.springframework.format.annotation.NumberFormat;
import org.springframework.format.annotation.NumberFormat.Style;

public class UserBean {

	@NotEmpty
	@Size(min = 1, max = 20)
	private String userName;

	@NumberFormat(style = Style.NUMBER)
	@NotNull(message = "Age must not be blank")
	@Min(value = 1, message = "Age must more then 1")
	@Max(value = 100, message = "Age must less then 100")
	private Integer age;

	@NotEmpty(message = "Password must not be blank.")
	@Size(min = 1, max = 10, message = "Password must between 1 to 10 Characters.")
	private String password;

	@NotEmpty
	private String confirmPassword;

	/** get and set  **/
}

  在对表单对象的错误信息提示的时候 我采用了几种方式。userName的错误信息配置在资源文件中（message.properties），如下所示：

NotEmpty.userBean.userName=\u7528\u6237\u540D\u4E0D\u80FD\u4E3A\u7A7A
#用户名不能为空

如果需要把错误提示信息配置在资源文件中，需要在spring-servlet.xml文件对 ReloadableResourceBundleMessageSource这个类进行注册如下：

<bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
		<property name="basename" value="/WEB-INF/message" />
	</bean>

 Age和password的提示信息就直接写在UserBean中，比如：

	@NumberFormat(style = Style.NUMBER)
	@NotNull(message = "Age must not be blank")
	@Min(value = 1, message = "Age must more then 1")
	@Max(value = 100, message = "Age must less then 100")
	private Integer age;

对password与Confirm password的校验就写在校验器中。如

package springapp.action;

import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;

import springapp.model.UserBean;

@Component("regValidation")
public class RegValidation {
	public boolean supports(Class<?> clazz) {
		return UserBean.class.isAssignableFrom(clazz);
	}

	public void validate(Object target, Errors errors) {
		UserBean userBean = (UserBean) target;
		ValidationUtils.rejectIfEmptyOrWhitespace(errors, "userName",
				"NotEmpty.userBean.userName",
				"User Name must not be Empty.");
		String userName = userBean.getUserName();
				if (!(userBean.getPassword()).equals(userBean.getConfirmPassword())) {
			errors.rejectValue("password",
					"matchingPassword.userBean.password",
					"Password and Confirm Password Not match.");
		}

	}
}

5、新建处理表单的Action

package springapp.action;

import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import springapp.model.UserBean;

@Controller
public class UserAction {

	@RequestMapping(value = "reg.do", method = RequestMethod.GET)
	public String init(Model model) {

		UserBean useBean = new UserBean();
		model.addAttribute("userBean", useBean);
		
		return "reg";
	}
	
	@RequestMapping(value="reg.do",method=RequestMethod.POST)
	public String reg(Model model,@Valid UserBean userBean,BindingResult result)
	{
		
		regValidation.validate(userBean, result);
		
		if(result.hasErrors())
		{
			return "reg";
		}
		model.addAttribute("userBean", userBean);
		return "regSuccess";
		
	}
	
	@Autowired
	private RegValidation regValidation;
}

 访问路径：http://localhost:80/SpringMVCValidation/reg.do