我正在使用Date dob;我在春季4.1.6使用maven的pojo类中的字段 以下是与我的应用程序相关联的文件。
//这是我的pojo课程。
package com.aamir;
import java.util.Date;
public class Student {
private String firstName;
private Date dob;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public Date getDob() {
return dob;
}
public void setDob(Date dob) {
this.dob = dob;
}
}
//这是我的客户端类
package com.aamir;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class ClientStud1 {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
Student student = (Student) context.getBean("s1");
System.out.println(student.getFirstName());
System.out.println(student.getDob());
}
} //最后这是我的beans.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
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">
<bean id="s1" class="com.aamir.Student">
<property name="firstName" value="aamir"/>
<property name="dob" value="12-12-1996"/>
</bean>
<bean id="dateEditor"
class="org.springframework.beans.propertyeditors.CustomDateEditor">
<constructor-arg>
<bean class="java.text.SimpleDateFormat">
<constructor-arg value="dd-MM-yyyy"/>
</bean>
</constructor-arg>
<constructor-arg value="true"/>
</bean>
<bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="customEditors">
<map>
<entry key="java.util.Date" value-ref="dateEditor"/>
</map>
</property>
</bean>
</beans>
每次我尝试运行客户端时都会收到此异常
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.beans.factory.config.CustomEditorConfigurer#0' defined in class path resource [beans.xml]:
Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.util.LinkedHashMap' to required type 'java.util.Map' for property 'customEditors'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [org.springframework.beans.propertyeditors.CustomDateEditor] to required type [java.lang.Class] for property 'customEditors[java.util.Date]': PropertyEditor [org.springframework.beans.propertyeditors.ClassEditor] returned inappropriate value of type [org.springframework.beans.propertyeditors.CustomDateEditor]
答案 0 :(得分：1)
请注意，PropertyEditor是有状态的，因此您不应直接注册实例。
customEditor属性PropertyEditorRegistrars propertyEditorRegistrars媒体资源添加CustomEditorConfigurer
如果要配置属性编辑器实例，请改用属性编辑器注册器。
<bean id="customEditorConfigurer" class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="propertyEditorRegistrars">
<list>
<bean class="org.example.CustomDateEditorRegistrar"/>
</list>
</property>
</bean>
答案 1 :(得分：0)
根据官方文档，注册PropertyEditor的推荐方法是创建实现class接口的propertyEditorRegistrar。每个propertyEditorRegistrar可以在给定的propertyEditors上注册任意数量的registry。
下面描述了两个这样的实现：
方法1：创建一个实现PropertyEditorRegistrar的通用类。
此类可用于任何propertyEditor（s），因此您可以将此类保留在utils中。
让我们将其命名为CustomEditorRegistrar，它看起来像这样：
public class CustomEditorRegistrar implements PropertyEditorRegistrar
{
Class<?> t;
PropertyEditor propertyEditor;
public CustomEditorRegistrar(Class<?> t, PropertyEditor propertyEditor)
{
this.t = t;
this.propertyEditor = propertyEditor;
}
@Override
public void registerCustomEditors(PropertyEditorRegistry registry)
{
registry.registerCustomEditor(t, propertyEditor);
}
}
。注册CustomDateEditor的bean定义如下：
<bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="propertyEditorRegistrars">
<list>
<bean class="mky.spring.property.editor.date.CustomEditorRegistrar">
<constructor-arg index="0">
<value type="java.lang.Class">java.util.Date</value>
</constructor-arg>
<constructor-arg index="1">
<bean class="org.springframework.beans.propertyeditors.CustomDateEditor">
<constructor-arg index="0">
<bean class="java.text.SimpleDateFormat">
<constructor-arg value="dd-MM-yyyy" />
</bean>
</constructor-arg>
<constructor-arg index="1" value="true" />
</bean>
</constructor-arg>
</bean>
</list>
</property>
</bean>
<bean
name="Customer"
class="mky.spring.property.editor.date.Customer"
p:name="Customer 1"
p:address="CounterHills LA"
p:deliveryDate="12-11-2016"
p:issueDate="12-10-2016" />
Sys-out客户：
public class TestGenericClient
{
ApplicationContext ctx;
public TestGenericClient()
{
ctx = new ClassPathXmlApplicationContext("genericPropertyEditorRegistrar-beans.xml");
}
public static void main(String[] args)
{
System.out.println(new TestGenericClient().ctx.getBean("Customer"));
}
}
输出是这样的：
Name=Customer 1
Address=CounterHills LA
Issue Date=Wed Oct 12 00:00:00 GST 2016
deliveryDate=Sat Nov 12 00:00:00 GST 2016
方法2：创建一个特定的propertyEditorRegistrar，例如，for Date
public class CustomDateEditorRegistrar implements PropertyEditorRegistrar
{
@Override
public void registerCustomEditors(PropertyEditorRegistry registry)
{
registry.registerCustomEditor(java.util.Date.class, new CustomDateEditor(new SimpleDateFormat("dd-MM-yyyyy"),true));
}
}
此特定CustomDateEditor的bean声明是：
<bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="propertyEditorRegistrars">
<list>
<bean class="mky.spring.property.editor.date.CustomDateEditorRegistrar" />
</list>
</property>
</bean>
Sys-out cleint：
public TestDateClient()
{
ctx = new ClassPathXmlApplicationContext("datePropertyEditorRegistrar-beans.xml");
}
public static void main(String[] args)
{
System.out.println(new TestDateClient().ctx.getBean("Customer"));
}
同样的输出：
Name=Customer 1
Address=CounterHills LA
Issue Date=Wed Oct 12 00:00:00 GST 2016
deliveryDate=Sat Nov 12 00:00:00 GST 2016