解决使用intellij idea开发MAVEN项目在target目录下不存在mapper.xml文件

原本在Eclipse中好好的MAVEN项目，导入intellij idea中，服务器启动正常,但在调用userMapper接口时，报以下异常：

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.beauxie.wxj.dao.UserMapper.findUserByConditionat org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:178)at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:38)at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:49)at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:42)at com.sun.proxy.$Proxy10.findUserByCondition(Unknown Source)at com.beauxie.wxj.service.impl.UserServiceImpl.validata(UserServiceImpl.java:61)at com.beauxie.wxj.service.impl.UserServiceImpl.validataUsername(UserServiceImpl.java:35)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)at com.sun.proxy.$Proxy13.validataUsername(Unknown Source)at com.beauxie.wxj.controller.UserController.checkUsername(UserController.java:83)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)at java.lang.Thread.run(Thread.java:745)Caused by: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.beauxie.wxj.dao.UserMapper.findUserByConditionat org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:775)at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:615)at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:608)at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:176)... 60 more

“Invalid bound statement (not found):com.beauxie.wxj.dao.UserMapper.findUserByCondition ”，说明这个异常是在调用Mapper接口时发生的，看到这个异常时，首选想到的是配置可能出了问题，或者没有加注解，但反复检查以后，发现配置啥的都没问题，其中xml配置文件中，关于DAO层与Mapper文件的映射配置如下：

<!-- 自动扫描entity目录, 省掉Configuration.xml里的手工配置 --><property name="mapperLocations" value="classpath:com/beauxie/**/mapping/*.xml" />

配置文件没有问题，因为在Eclipse中都是正常的，查看控制台输出：

以上的信息表示，服务器正在搜索文件以此来匹配：“com/beauxie/**/mapping/*.xml”，但最后的结果却是：

也就是说没有匹配到！我***，最后静下心来发现是在target目录下对应的位置找不到这个文件，然后去对应的目录下发现其他的包都在（比如controller包），就是没有mapper包（存放Mapper文件的），这让我很纳闷。最后自己百度了一下，终于找到了原因：

对于MAVEN项目，Eclipse会自动把项目src\main\java\目录下的配置文件（.xml）和资源文件(.properties)搬运到target目录下，而intellij idea默认是不会帮我们做这件事的。

解决办法：

在pom.xml文件中加入以下配置：

对应代码如下：

 <!--解决Intellij构建项目时，target/classes目录下不存在mapper.xml文件-->        <resources>            <resource>                <directory>${basedir}/src/main/java</directory>                <includes>                    <include>**/*.xml</include>                </includes>            </resource>        </resources>

这段代码的意思就是把src/main/java目录下所有的xml文件都包含进去，其中${basedir} 是MAVEN的内置变量，表示项目根目录。

同样，想包含其他什么文件，比如.properties文件，再加一个<include>标签类似的写法即可。

做了以上工作以后，再把项目“Reimport”（右键选中项目->Maven->Reimport）一下，启动服务器，调用Mapper接口便不会报错了，而且target目录下对应的位置也有了mapper.xml文件。