IDEA下Maven项目整合Spring和MyBatis出现jdbc.properties is invalid;前言中不允许有内容

在Idea下用Maven管理Spring和MyBatis整合的项目，在Junit测试service层代码时不会出错，但把整个项目发布到Tomcat时抛出各种各样的异常，花了最多时间的异常为：

org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 1 in XML document from class path resource [jdbc.properties] is invalid; nested exception is org.xml.sax.SAXParseException;  lineNumber: 1; columnNumber: 1; 前言中不允许有内容。

Caused by: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; 前言中不允许有内容。

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解决此异常的思路

检查项目中的各类配置文件


首先检查spring框架的配置文件applicationContext.xml，一开始有异常的配置文件如下：

<?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">    <!--c3p0数据源(properties文件配置)-->    <!--<context:property-placeholder location="classpath:jdbc.properties"/>-->    <context:property-placeholder location="jdbc.properties"/>    <bean id="c3p0Datasource" class="com.mchange.v2.c3p0.ComboPooledDataSource">        <property name="driverClass" value="${jdbc.driver}"/>        <property name="jdbcUrl" value="${jdbc.url}"/>        <property name="user" value="${jdbc.user}"/>        <property name="password" value="${jdbc.password}"/>    </bean>    <!--c3p0数据源(直接配置)-->    <!--<bean id="c3p0Datasource" class="com.mchange.v2.c3p0.ComboPooledDataSource">-->    <!--<property name="driverClass" value="com.mysql.jdbc.Driver"/>-->    <!--<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/conference"/>-->    <!--<property name="user" value="root"/>-->    <!--<property name="password" value="qwer123456"/>-->    <!--</bean>-->    <!-- 创建-SqlSessionFactory对象 -->    <bean id="mysqlSqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">        <property name="configLocation" value="classpath:mybatis.xml"/>        <property name="dataSource" ref="c3p0Datasource"/>    </bean>    <!-- 生成Dao代理对象-->    <bean id="userinfoDao" class="org.mybatis.spring.mapper.MapperFactoryBean">        <property name="sqlSessionFactory" ref="mysqlSqlSessionFactory"/>        <property name="mapperInterface" value="modeldao.UserinfoDao"/>    </bean>    <!-- 扫描式动态代理-->    <!-- 配置为指定包中的所有接口生成代理对象-->    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">        <property name="sqlSessionFactoryBeanName" value="mysqlSqlSessionFactory"/>        <property name="basePackage" value="modeldao"/>    </bean>    <bean id="scurityGuaranteeService" class="service.ScurityGuaranteeService">        <property name="dao" ref="securityGuaranteeDao"/>    </bean></beans>

初始有异常的web.xml配置文件如下：

<?xml version="1.0" encoding="UTF-8" ?><web-app xmlns="http://java.sun.com/xml/ns/javaee"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee          http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"         version="3.0">    <display-name>Archetype Created Web Application</display-name>    <context-param>        <param-name>contextConfigLocation</param-name>        <param-value>classpath:applicationContext.xml classpath:jdbc.properties</param-value>    </context-param>    <!-- 注册ServletContext监听器-->    <!-- 1. 在ServletContext被创建时，创建Spring容器对象-->    <!-- 2. 把创建的Spring容器对象放入Application域中-->    <listener>        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>    </listener>    <welcome-file-list>        <welcome-file>index.jsp</welcome-file>    </welcome-file-list></web-app>

jdbc.properties内容如下：

jdbc.driver = com.mysql.jdbc.Driverjdbc.url = jdbc:mysql://localhost:3306/conferencejdbc.user = rootjdbc.password = qwer123456

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解决方法

正确配置截图