java - 如何验证表单页面中的整数输入？

Question

我正在为客户创建页面，因此一切正常，直到我想强制用户在“免费通行证”字段中输入数字时出现错误

我尝试在 Customer 类中创建一个名为 freePasses 的整数类型字段，然后为其生成 getter 和 setter，我还修改了我的 .properties 文件

客户.java

@Min(value = 0 , message="the value must be equal or greater than 0")
    @Max(value = 10, message = "the value must be equal or less than 10")
    @NotNull(message = "is required")
    private Integer freePasses;

public Integer getFreePasses() {
        return freePasses;
    }



    public void setFreePasses(Integer freePasses) {
        this.freePasses = freePasses;
    }

应用程序位置.属性

spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp
typeMismatch.customer.freePasses = invalid Number

Pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <version>8.5.20</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
        <dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>6.0.17.Final</version>
</dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

无法将类型 java.lang.String 的属性值转换为属性 freePasses 所需的类型 java.lang.Integer；嵌套异常是 java.lang.NumberFormatException: For input string: "44xxxx"

Answer 1

我认为<form:input type=?number? path="date" />会起作用的。