springMVC封装请求bean

前台请求发送数据到后台，请求data中的名字与bean中字段相等，可直接使用springMVC封装，并可验证。
control

    @RequestMapping("applyShop")
    @ResponseBody
    public Object applyShop(@Valid @ModelAttribute TCk ck, BindingResult result) {
        if (result.hasErrors()) {
            return CommentUtil.returnResultMap(0, false, "hzc-exceptions:arguments are wrong");
        }
        int rs = ickServer.saveCkInfo(ck);
        if (rs > 0) {
            return CommentUtil.returnResultMap(1, true, "申请成功");
        } else {
            return CommentUtil.returnResultMap(0, false, "申请失败");
        }
    }

@Valid 意思是在把数据绑定到@ModelAttribute 后就进行验证。
BindingResult 为验证结果。

bean

public class TCk {

    @NotEmpty
    private String realname;
    public String getRealname() {
        return realname;
    }

    public void setRealname(String realname) {
        this.realname = realname == null ? null :    realname.trim();
    }
  }

下面是主要的验证注解及说明：

注解

适用的数据类型

说明

@AssertFalse

Boolean, boolean

验证注解的元素值是false

@AssertTrue

Boolean, 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

@Future

java.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

@NotNull

Any type

验证注解的元素值不是null

@Null

Any type

验证注解的元素值是null

@Past

java.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

@Valid

Any 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

@NotEmpty

CharSequence,Collection, Map 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

@NotBlank

CharSequence

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

@Email

CharSequence

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