我是Spring的新手，我面临着一个值类型转换问题。在需要整型的Free Pass字段中输入字符串时，我希望从属性文件中得到自定义错误消息“INVALID NUMBER”，但我得到的是：
Failed to convert property value of type java.lang.String to required type java.lang.Integer for property freePasses; nested exception is java.lang.NumberFormatException: For input string: "sdf"我是不是做错了什么，或者错过了一些Java库？
控制器：
import org.springframework.beans.propertyeditors.StringTrimmerEditor;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
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 javax.validation.Valid;
@Controller
@RequestMapping("/customer")
public class CustomerController {
@InitBinder
public void initBinder(WebDataBinder dataBinder) {
StringTrimmerEditor stringTrimmerEditor = new StringTrimmerEditor(true);
dataBinder.registerCustomEditor(String.class, stringTrimmerEditor);
}
@RequestMapping("/showForm")
public String showForm(Model theModel) {
theModel.addAttribute("customer", new Customer());
return "customer-form";
}
@RequestMapping("/processForm")
public String processForm(
@Valid @ModelAttribute("customer") Customer theCustomer,
BindingResult theBindingResult
) {
if (theBindingResult.hasErrors()) {
return "customer-form";
} else {
return "customer-confirmation";
}
}
}班级：
import javax.validation.constraints.*;
public class Customer {
@NotNull(message="is required")
@Min(value = 0, message = "cannot be less than 0")
@Max(value = 10, message = "cannot be more than 10")
private Integer freePasses;
public Integer getFreePasses() {
return freePasses;
}
public void setFreePasses(Integer freePasses) {
this.freePasses = freePasses;
}
}配置：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd">
<!-- Step 3: Add support for component scanning -->
<context:component-scan base-package="com.autosdet.autosdetmvc" />
<util:properties id="countryOptions" location="classpath:countries.properties" />
<!-- Step 4: Add support for conversion, formatting and validation support -->
<mvc:annotation-driven/>
<!-- Step 5: Define Spring MVC view resolver -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/view/" />
<property name="suffix" value=".jsp" />
</bean>
<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basenames" value="messages" />
</bean>
</beans>表格：
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Custome Form</title>
<style>
.error {color: red}
</style>
</head>
<body>
Fill out the form.Asterisk (*) required.
<form:form action="processForm" modelAttribute="customer">
Free Passes (*): <form:input path="freePasses" />
<form:errors path="freePasses" cssClass="error" />
<br><br>
<input type="submit" value="Submit" />
</form:form>
<br><br>
<a href="/autosdet_mvc_war_exploded">Main Menu</a>
</body>
</html>属性：
type.Mismatch.customer.freePasses=Invalid number
1条答案
按热度按时间4jb9z9bj1#
Java.lang.NumberFormatException：输入字符串：“sdf”
在Spring中，字符串到整数的转换是使用
Integer.parseInt()或Integer.valueOf()执行的。显然，您的输入"sdf"不能转换为数值，这与"12345"不同。我会检查您实际传递到表单中的值，即
freePasses参数。看起来你是在给他们发短信，而不是数字：