<bean id="list" class="java.util.ArrayList<java.lang.String>"/>
启动容器时,将报如下所示:
Caused by: org.xml.sax.SAXParseException: The value of attribute "class" associated with an element type "null" must not contain the '<' character. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:174) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:388) at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1427) at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanAttributeValue(XMLScanner.java:945)
这是因为“<”或“>”的字符是XML的特殊字符,它会破坏Spring XML配置文件的格式,因此产生了错误
由于Spring 3.0引入了JavaConfig,以代码的方式定义Bean,因此我们可以使用如下方式配置之:
package com.ioctest; /** * Copyright:中软海晟信息科技有限公司 版权所有 违者必究 2013 */ import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import java.util.ArrayList; import java.util.List; @Configuration public class AppConfig { @Bean(name = "listStr") public List<String> listStrBean(){ return new ArrayList<String>(); } }
在XML配置文件中引用这个JavaConfig:
<?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" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd"> <!-- <bean id="list" class="java.util.ArrayList<java.lang.String>"/>--> <context:component-scan base-package="com.ioctest"/> <context:annotation-config/> </beans>
这个就可以正确启动了:
import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import java.util.List; public class Tester { public static void main(String[] args) { ApplicationContext applicationContext = new ClassPathXmlApplicationContext("test.xml"); List<String> listStr = (List<String>) applicationContext.getBean("listStr"); listStr.add("ddd"); } }