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一、数据校验在web应用程序中,为了防止客户端传来的数据引发程序异常,常常需要对 数据进行验证。输入验证分为客户端验证与服务器端验证。客户端验证主要通过JavaScript脚本进行,而服务器端验证则主要通过Java代码进行验证。 为了保证数据的安全性,一般情况下,客户端和服务器端验证都是必须的
二、关键步骤:①、导入JAR包SpringMVC支持JSR(Java Specification Result,Java规范提案)303-Bean Validation数据验证规范。而该规范的实现者很多,其中较常用的是Hibernate Validator。需要注意的是,Hibernate Validator是与Hibernate ORM并列的Hibernate的产品之一。这一点从Hibernate官网上所提供的资源形式可以看出他们之间的关系。 ②applicationContext.xml中配置验证器③定义实体类,打注解标记
1234567891011121314public class UserInfo {    @NotEmpty(message="用户名不能为空"    @Size(min=3,max=6,message="姓名长度应在{min}-{max}"    private String username;         @NotNull(message="成绩最大值为100"    @Min(value=0,message="成绩不能小于{value}"    @Max(value=100,message="成绩不能大于{value}"    private Integer score;         @NotEmpty(message="手机号码不允许为空"    @Pattern(regexp="^1[34578]\d{9}$",message="手机号码格式不正确"    private String phone;}
注:下面是主要的验证注解及说明:
注解适用的数据类型说明
@AssertFalseBoolean, boolean验证注解的元素值是false
@AssertTrueBoolean, boolean验证注解的元素值是true
@DecimalMax(value=x)BigDecimal, BigInteger, String, byte,short, int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type of Number andCharSequence.验证注解的元素值小于等于@ DecimalMax指定的value值
@DecimalMin(value=x)BigDecimal, BigInteger, String, byte,short, int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type of Number andCharSequence.验证注解的元素值小于等于@ DecimalMin指定的value值
@Digits(integer=整数位数, fraction=小数位数)BigDecimal, BigInteger, String, byte,short, int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type of Number andCharSequence.验证注解的元素值的整数位数和小数位数上限
@Futurejava.util.Date, java.util.Calendar; Additionally supported by HV, if theJoda Time date/time API is on the class path: any implementations ofReadablePartial andReadableInstant.验证注解的元素值(日期类型)比当前时间晚
@Max(value=x)BigDecimal, BigInteger, byte, short,int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type ofCharSequence (the numeric value represented by the character sequence is evaluated), any sub-type of Number.验证注解的元素值小于等于@Max指定的value值
@Min(value=x)BigDecimal, BigInteger, byte, short,int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type of CharSequence (the numeric value represented by the char sequence is evaluated), any sub-type of Number.验证注解的元素值大于等于@Min指定的value值
@NotNullAny type验证注解的元素值不是null
@NullAny type验证注解的元素值是null
@Pastjava.util.Date, java.util.Calendar; Additionally supported by HV, if theJoda Time date/time API is on the class path: any implementations ofReadablePartial andReadableInstant.验证注解的元素值(日期类型)比当前时间早
@Pattern(regex=正则表达式, flag=)String. Additionally supported by HV: any sub-type of CharSequence.验证注解的元素值与指定的正则表达式匹配
@Size(min=最小值, max=最大值)String, Collection, Map and arrays. Additionally supported by HV: any sub-type of CharSequence.验证注解的元素值的在min和max(包含)指定区间之内,如字符长度、集合大小
@ValidAny non-primitive type(引用类型)验证关联的对象,如账户对象里有一个订单对象,指定验证订单对象
@NotEmptyCharSequence,CollectionMap and Arrays验证注解的元素值不为null且不为空(字符串长度不为0、集合大小不为0)
@Range(min=最小值, max=最大值)CharSequence, Collection, Map and Arrays,BigDecimal, BigInteger, CharSequence, byte, short, int, long and the respective wrappers of the primitive types验证注解的元素值在最小值和最大值之间
@NotBlankCharSequence验证注解的元素值不为空(不为null、去除首位空格后长度为0),不同于@NotEmpty,@NotBlank只应用于字符串且在比较时会去除字符串的空格
@Length(min=下限, max=上限)CharSequence验证注解的元素值长度在min和max区间内
@EmailCharSequence验证注解的元素值是Email,也可以通过正则表达式和flag指定自定义的email格式
④书写Controller方法 ⑤搭建jsp页面
1234567<form action="${pageContext.request.contextPath }/first.do" method="post">   <h1>数据验证</h1>                姓名:<input name="username"/>${namemsg }<br/><br/>                成绩:<input name="score" />${scoremsg}<br/><br/>                电话:<input name="phone" />${phonemsg }<br/><br/>      <input type="submit" value="注册"/>   </form>
实现效果: 若都不进行输入: 若输入合法: SpringMVC+MyBatis集成配置  http://www.linuxidc.com/Linux/2016-09/135212.htmSpringMVC总结篇  http://www.linuxidc.com/Linux/2016-06/132659.htmSpring+SpringMVC企业快速开发架构搭建  http://www.linuxidc.com/Linux/2015-09/122942.htmSpringMVC的乱码处理  http://www.linuxidc.com/Linux/2015-07/120542.htmSpring MVC+Spring3+Hibernate4开发环境搭建 http://www.linuxidc.com/Linux/2013-07/87119.htmSpring MVC整合Freemarker基于注解方式 http://www.linuxidc.com/Linux/2013-02/79660.htm基于注解的Spring MVC简单介绍 http://www.linuxidc.com/Linux/2012-02/54896.htmSpringMVC详细示例实战教程 http://www.linuxidc.com/Linux/2015-06/118461.htmSpringMVC错误页面配置  http://www.linuxidc.com/Linux/2016-12/138097.htmSpringMVC 异常处理  http://www.linuxidc.com/Linux/2015-06/119049.htmSpringMVC框架入门配置 IDEA下搭建Maven项目 http://www.linuxidc.com/Linux/2016-09/134918.htm本文永久更新链接地址:http://www.linuxidc.com/Linux/2017-01/139333.htm