spring 依赖注入方式出现的问题:必须为元素类型 "constructor-arg" 声明属性 "name"。

spring 依赖注入方式出现的问题:必须为元素类型 “constructor-arg” 声明属性 “name”。

我的bean.xml头文件:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">

修改为

<?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:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

我在这里出现以下错误

: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'accountService' defined in class path resource [bean.xml]: Unsatisfied dependency expressed through constructor parameter 2: Could not convert argument value of type [java.lang.String] to required type [java.util.Date]: Failed to convert value of type 'java.lang.String' to required type 'java.util.Date'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'java.util.Date': no matching editors or conversion strategy found
Exception in thread "main" org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'accountService' defined in class path resource [bean.xml]: Unsatisfied dependency expressed through constructor parameter 2: Could not convert argument value of type [java.lang.String] to required type [java.util.Date]: Failed to convert value of type 'java.lang.String' to required type 'java.util.Date'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'java.util.Date': no matching editors or conversion strategy found
	a

解决:

<constructor-arg name="birthday" ref="now"> </constructor-arg>

<!-- 配置一个日期对象-->
    <bean id="now" class="java.util.Date"></bean>