java 如何使用 spring 注释检查字符串是否为整数？
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how check string is integer or not by using spring annotations?
提问by Suraj
**i want test user input is a alpha-numeric or integer by using spring form annotations **
**我希望通过使用弹簧形式注释测试用户输入是字母数字或整数**
i have also tried this code.
i have also tried this code.
@NotEmpty
@NumberFormat(style = Style.NUMBER)
@Length(min =11,max =11)
@Column(name="abc")
private String xyz;
采纳答案by adchilds
The @NumberFormatannotationonly applies to subclasses of java.lang.Number (Integer, Float, Double, BigDecimal, etc.); therefore, it won't work with Strings. For this, you may have to create a custom annotation that validates the String only contains numbers.
该@NumberFormat注释仅适用于java.lang.Number中（的子类整数，浮点，双，BigDecimal的，等）; 因此，它不适用于字符串。为此，您可能需要创建一个自定义注释来验证字符串仅包含数字。
Take a look at the following tutorial; it's very thorough on how to create custom annotations and use them for validation with Spring: http://softwarecave.org/2014/03/27/custom-bean-validation-constraints/
看看下面的教程；关于如何创建自定义注释并将它们用于 Spring 验证非常详尽：http: //softwarecave.org/2014/03/27/custom-bean-validation-constraints/
回答by randal4
I ran into a similar problem and used the @Patternannotation to compare against a regular expression.
我遇到了类似的问题，并使用@Pattern注释与正则表达式进行比较。
@Pattern(regexp="^(0|[1-9][0-9]*)$")
The annotation is part of the javax.validation.constraintspackage.
注释是javax.validation.constraints包的一部分。
