org.springframework.beans.factory.BeanCreationException

經常犯這個錯誤，記錄下來，理一理xml檔案之間的關係
錯誤原因：config.xml檔案的mapper標籤引入了錯誤的檔案
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘org.mybatis.spring.mapper.MapperScannerConfigurer#0’ defined in class path resource [applicationContext.xml]: Cannot resolve reference to bean ‘SqlSessionFactory’ while setting bean property ‘sqlSessionFactory’; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘SqlSessionFactory’ defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse config resource: class path resource [config/config.xml]; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.lang.RuntimeException: Error parsing Mapper XML.

Mapper.xml檔案是寫SQL語句的，要講Mapper.xml檔案對映到config.xml檔案中
config.xml檔案內容：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "mybatis-3-config.dtd" >
<configuration>
<！--實體類取別名-->
<typeAliases>
<typeAlias type="com.lhm.entity.Person" alias="person"/>
</typeAliases>
<！--將Mapper.xml檔案引入config.xml檔案中-->
<！--PersonDao.xml就是Mapper.xml檔案，與相應的DAO介面同名-->
<mappers>
<mapper resource="com/lhm/dao/PersonDao.xml"/>
</mappers>
</configuration>
 

將config.xml檔案對映到applicationContext.xml檔案中

applicationContext.xml檔案部分內容：

再將applicationContext.xml配置到web.xml檔案中

  <servlet>
  <servlet-name>springmvc</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <init-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath:applicationContext.xml</param-value>
  </init-param>
  </servlet>
  <servlet-mapping>
  <servlet-name>springmvc</servlet-name>
  <url-pattern>*.do</url-pattern>
  </servlet-mapping>
 

mapper.xml -> config.xml -> applicationContext.xml -> web.xml