1、需要的jar包
2、springsevlet-config.xml配置
在spring3之后，任何支持JSR303的validator（如Hibernate Validator）都可以通过简单配置引入，只需要在配置xml中加入，这时validatemessage的属性文件默认为classpath下的ValidationMessages.properties：
<!-- support JSR303 annotation if JSR 303 validation present on classpath -->
<mvc:annotation-driven />
如果不使用默认，可以使用下面配置：
<mvc:annotation-driven validator="validator" /> <bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">
<property name="providerClass" value="org.hibernate.validator.HibernateValidator"/>
<!--不设置则默认为classpath下的ValidationMessages.properties -->
<property name="validationMessageSource" ref="validatemessageSource"/>
</bean>
<bean id="validatemessageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basename" value="classpath:validatemessages"/>
<property name="fileEncodings" value="utf-8"/>
<property name="cacheSeconds" value="120"/>
</bean>
3、hibernate validator constraint 注解
Bean Validation 中内置的 constraint
@Null 被注释的元素必须为 null
@NotNull 被注释的元素必须不为 null
@AssertTrue 被注释的元素必须为 true
@AssertFalse 被注释的元素必须为 false
@Min(value) 被注释的元素必须是一个数字，其值必须大于等于指定的最小值
@Max(value) 被注释的元素必须是一个数字，其值必须小于等于指定的最大值
@DecimalMin(value) 被注释的元素必须是一个数字，其值必须大于等于指定的最小值
@DecimalMax(value) 被注释的元素必须是一个数字，其值必须小于等于指定的最大值
@Size(max=, min=) 被注释的元素的大小必须在指定的范围内
@Digits (integer, fraction) 被注释的元素必须是一个数字，其值必须在可接受的范围内
@Past 被注释的元素必须是一个过去的日期
@Future 被注释的元素必须是一个将来的日期
@Pattern(regex=,flag=) 被注释的元素必须符合指定的正则表达式 Hibernate Validator 附加的 constraint
@NotBlank(message =) 验证字符串非null，且长度必须大于0
@Email 被注释的元素必须是电子邮箱地址
@Length(min=,max=) 被注释的字符串的大小必须在指定的范围内
@NotEmpty 被注释的字符串的必须非空
@Range(min=,max=,message=) 被注释的元素必须在合适的范围内
Demo:
编写自己的验证类：
package com.journaldev.spring.form.validator; import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator; import com.journaldev.spring.form.model.Employee;
/**
*自定义一个验证类由于对员工信息进项验证（实现Validator接口）
*/
public class EmployeeFormValidator implements Validator { //which objects can be validated by this validator
@Override
public boolean supports(Class<?> paramClass) {
return Employee.class.equals(paramClass);
}
//重写validate（）方法编写验证规则
@Override
public void validate(Object obj, Errors errors) {
ValidationUtils.rejectIfEmptyOrWhitespace(errors, "id", "id.required"); Employee emp = (Employee) obj;
if(emp.getId() <=0){
errors.rejectValue("id", "negativeValue", new Object[]{"'id'"}, "id can't be negative");
} ValidationUtils.rejectIfEmptyOrWhitespace(errors, "name", "name.required");
ValidationUtils.rejectIfEmptyOrWhitespace(errors, "role", "role.required");
}
}
控制器代码：
package com.journaldev.spring.form.controllers; import java.util.HashMap;
import java.util.Map; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.validation.Validator;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod; import com.journaldev.spring.form.model.Employee; @Controller
public class EmployeeController { private static final Logger logger = LoggerFactory
.getLogger(EmployeeController.class); private Map<Integer, Employee> emps = null; @Autowired
@Qualifier("employeeValidator")
private Validator validator; @InitBinder
private void initBinder(WebDataBinder binder) {
binder.setValidator(validator);
} public EmployeeController() {
emps = new HashMap<Integer, Employee>();
} @ModelAttribute("employee")
public Employee createEmployeeModel() {
// ModelAttribute value should be same as used in the empSave.jsp
return new Employee();
} @RequestMapping(value = "/emp/save", method = RequestMethod.GET)
public String saveEmployeePage(Model model) {
logger.info("Returning empSave.jsp page");
return "empSave";
} @RequestMapping(value = "/emp/save.do", method = RequestMethod.POST)
public String saveEmployeeAction(
@ModelAttribute("employee") @Validated Employee employee,
BindingResult bindingResult, Model model) {
if (bindingResult.hasErrors()) {
logger.info("Returning empSave.jsp page");
return "empSave";
}
logger.info("Returning empSaveSuccess.jsp page");
model.addAttribute("emp", employee);
emps.put(employee.getId(), employee);
return "empSaveSuccess";
}
}
员工类代码：
package com.journaldev.spring.form.model;
public class Employee {
private int id;
private String name;
private String role;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getRole() {
return role;
}
public void setRole(String role) {
this.role = role;
}
}
jsp页面：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ taglib uri="http://www.springframework.org/tags/form"
prefix="springForm"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Employee Save Page</title>
<style>
.error {
color: #ff0000;
font-style: italic;
font-weight: bold;
}
</style>
</head>
<body> <springForm:form method="POST" commandName="employee"
action="save.do">
<table>
<tr>
<td>Employee ID:</td>
<td><springForm:input path="id" /></td>
<td><springForm:errors path="id" cssClass="error" /></td>
</tr>
<tr>
<td>Employee Name:</td>
<td><springForm:input path="name" /></td>
<td><springForm:errors path="name" cssClass="error" /></td>
</tr>
<tr>
<td>Employee Role:</td>
<td><springForm:select path="role">
<springForm:option value="" label="Select Role" />
<springForm:option value="ceo" label="CEO" />
<springForm:option value="developer" label="Developer" />
<springForm:option value="manager" label="Manager" />
</springForm:select></td>
<td><springForm:errors path="role" cssClass="error" /></td>
</tr>
<tr>
<td colspan="3"><input type="submit" value="Save"></td>
</tr>
</table> </springForm:form> </body>
</html>